1 13b2bc37 2022-10-23 stsp /*
   2 13b2bc37 2022-10-23 stsp  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
   3 13b2bc37 2022-10-23 stsp  *
   4 13b2bc37 2022-10-23 stsp  * Permission to use, copy, modify, and distribute this software for any
   5 13b2bc37 2022-10-23 stsp  * purpose with or without fee is hereby granted, provided that the above
   6 13b2bc37 2022-10-23 stsp  * copyright notice and this permission notice appear in all copies.
   7 13b2bc37 2022-10-23 stsp  *
   8 13b2bc37 2022-10-23 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 13b2bc37 2022-10-23 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 13b2bc37 2022-10-23 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 13b2bc37 2022-10-23 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 13b2bc37 2022-10-23 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 13b2bc37 2022-10-23 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 13b2bc37 2022-10-23 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 13b2bc37 2022-10-23 stsp  */
  16 13b2bc37 2022-10-23 stsp 
  17 13b2bc37 2022-10-23 stsp #include <sys/queue.h>
  18 13b2bc37 2022-10-23 stsp #include <sys/tree.h>
  19 13b2bc37 2022-10-23 stsp #include <sys/time.h>
  20 13b2bc37 2022-10-23 stsp #include <sys/types.h>
  21 13b2bc37 2022-10-23 stsp #include <sys/stat.h>
  22 13b2bc37 2022-10-23 stsp #include <sys/socket.h>
  23 13b2bc37 2022-10-23 stsp #include <sys/un.h>
  24 13b2bc37 2022-10-23 stsp #include <sys/wait.h>
  25 abe89edb 2023-11-16 stsp #include <sys/resource.h>
  26 13b2bc37 2022-10-23 stsp 
  27 13b2bc37 2022-10-23 stsp #include <fcntl.h>
  28 13b2bc37 2022-10-23 stsp #include <err.h>
  29 13b2bc37 2022-10-23 stsp #include <errno.h>
  30 13b2bc37 2022-10-23 stsp #include <event.h>
  31 13b2bc37 2022-10-23 stsp #include <limits.h>
  32 13b2bc37 2022-10-23 stsp #include <pwd.h>
  33 13b2bc37 2022-10-23 stsp #include <imsg.h>
  34 13b2bc37 2022-10-23 stsp #include <sha1.h>
  35 5822e79e 2023-02-23 op #include <sha2.h>
  36 13b2bc37 2022-10-23 stsp #include <signal.h>
  37 13b2bc37 2022-10-23 stsp #include <siphash.h>
  38 13b2bc37 2022-10-23 stsp #include <stdarg.h>
  39 13b2bc37 2022-10-23 stsp #include <stdio.h>
  40 13b2bc37 2022-10-23 stsp #include <stdlib.h>
  41 13b2bc37 2022-10-23 stsp #include <string.h>
  42 13b2bc37 2022-10-23 stsp #include <syslog.h>
  43 13b2bc37 2022-10-23 stsp #include <unistd.h>
  44 13b2bc37 2022-10-23 stsp 
  45 13b2bc37 2022-10-23 stsp #include "got_error.h"
  46 13b2bc37 2022-10-23 stsp #include "got_opentemp.h"
  47 13b2bc37 2022-10-23 stsp #include "got_path.h"
  48 13b2bc37 2022-10-23 stsp #include "got_repository.h"
  49 13b2bc37 2022-10-23 stsp #include "got_object.h"
  50 13b2bc37 2022-10-23 stsp #include "got_reference.h"
  51 ba97b2d7 2024-03-20 stsp #include "got_diff.h"
  52 13b2bc37 2022-10-23 stsp 
  53 13b2bc37 2022-10-23 stsp #include "got_lib_delta.h"
  54 13b2bc37 2022-10-23 stsp #include "got_lib_object.h"
  55 13b2bc37 2022-10-23 stsp #include "got_lib_object_cache.h"
  56 53bf0b54 2023-02-23 op #include "got_lib_hash.h"
  57 13b2bc37 2022-10-23 stsp #include "got_lib_gitproto.h"
  58 13b2bc37 2022-10-23 stsp #include "got_lib_pack.h"
  59 13b2bc37 2022-10-23 stsp #include "got_lib_repository.h"
  60 13b2bc37 2022-10-23 stsp 
  61 13b2bc37 2022-10-23 stsp #include "gotd.h"
  62 13b2bc37 2022-10-23 stsp #include "log.h"
  63 d93ecf7d 2022-12-14 stsp #include "listen.h"
  64 0ccf3acb 2022-11-16 stsp #include "auth.h"
  65 e70fd952 2024-03-22 stsp #include "session_read.h"
  66 e70fd952 2024-03-22 stsp #include "session_write.h"
  67 13b2bc37 2022-10-23 stsp #include "repo_read.h"
  68 13b2bc37 2022-10-23 stsp #include "repo_write.h"
  69 ba97b2d7 2024-03-20 stsp #include "notify.h"
  70 13b2bc37 2022-10-23 stsp 
  71 13b2bc37 2022-10-23 stsp #ifndef nitems
  72 13b2bc37 2022-10-23 stsp #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
  73 13b2bc37 2022-10-23 stsp #endif
  74 13b2bc37 2022-10-23 stsp 
  75 eac23c30 2023-01-10 stsp enum gotd_client_state {
  76 eac23c30 2023-01-10 stsp 	GOTD_CLIENT_STATE_NEW,
  77 eac23c30 2023-01-10 stsp 	GOTD_CLIENT_STATE_ACCESS_GRANTED,
  78 c929736a 2023-06-22 op };
  79 c929736a 2023-06-22 op 
  80 c929736a 2023-06-22 op struct gotd_child_proc {
  81 c929736a 2023-06-22 op 	pid_t				 pid;
  82 c929736a 2023-06-22 op 	enum gotd_procid		 type;
  83 c929736a 2023-06-22 op 	char				 repo_name[NAME_MAX];
  84 c929736a 2023-06-22 op 	char				 repo_path[PATH_MAX];
  85 c929736a 2023-06-22 op 	int				 pipe[2];
  86 c929736a 2023-06-22 op 	struct gotd_imsgev		 iev;
  87 839338f6 2023-06-22 op 	struct event			 tmo;
  88 839338f6 2023-06-22 op 
  89 839338f6 2023-06-22 op 	TAILQ_ENTRY(gotd_child_proc)	 entry;
  90 eac23c30 2023-01-10 stsp };
  91 839338f6 2023-06-22 op TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
  92 eac23c30 2023-01-10 stsp 
  93 13b2bc37 2022-10-23 stsp struct gotd_client {
  94 13b2bc37 2022-10-23 stsp 	STAILQ_ENTRY(gotd_client)	 entry;
  95 13b2bc37 2022-10-23 stsp 	enum gotd_client_state		 state;
  96 13b2bc37 2022-10-23 stsp 	uint32_t			 id;
  97 13b2bc37 2022-10-23 stsp 	int				 fd;
  98 13b2bc37 2022-10-23 stsp 	struct gotd_imsgev		 iev;
  99 13b2bc37 2022-10-23 stsp 	struct event			 tmo;
 100 13b2bc37 2022-10-23 stsp 	uid_t				 euid;
 101 13b2bc37 2022-10-23 stsp 	gid_t				 egid;
 102 56624d2b 2023-12-27 stsp 	char				*username;
 103 f7a854cf 2023-01-10 stsp 	struct gotd_child_proc		*repo;
 104 5e25db14 2022-12-29 stsp 	struct gotd_child_proc		*auth;
 105 ae7c1b78 2023-01-10 stsp 	struct gotd_child_proc		*session;
 106 5e25db14 2022-12-29 stsp 	int				 required_auth;
 107 13b2bc37 2022-10-23 stsp };
 108 13b2bc37 2022-10-23 stsp STAILQ_HEAD(gotd_clients, gotd_client);
 109 13b2bc37 2022-10-23 stsp 
 110 13b2bc37 2022-10-23 stsp static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
 111 13b2bc37 2022-10-23 stsp static SIPHASH_KEY clients_hash_key;
 112 13b2bc37 2022-10-23 stsp volatile int client_cnt;
 113 ef4e2f01 2022-12-29 stsp static struct timeval auth_timeout = { 5, 0 };
 114 13b2bc37 2022-10-23 stsp static struct gotd gotd;
 115 13b2bc37 2022-10-23 stsp 
 116 13b2bc37 2022-10-23 stsp void gotd_sighdlr(int sig, short event, void *arg);
 117 f1752522 2022-10-29 stsp static void gotd_shutdown(void);
 118 ae7c1b78 2023-01-10 stsp static const struct got_error *start_session_child(struct gotd_client *,
 119 ae7c1b78 2023-01-10 stsp     struct gotd_repo *, char *, const char *, int, int);
 120 b50a2b46 2022-12-29 stsp static const struct got_error *start_repo_child(struct gotd_client *,
 121 b50a2b46 2022-12-29 stsp     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
 122 5e25db14 2022-12-29 stsp static const struct got_error *start_auth_child(struct gotd_client *, int,
 123 5e25db14 2022-12-29 stsp     struct gotd_repo *, char *, const char *, int, int);
 124 b50a2b46 2022-12-29 stsp static void kill_proc(struct gotd_child_proc *, int);
 125 839338f6 2023-06-22 op static void disconnect(struct gotd_client *);
 126 13b2bc37 2022-10-23 stsp 
 127 13b2bc37 2022-10-23 stsp __dead static void
 128 575dc3f9 2023-02-09 op usage(void)
 129 13b2bc37 2022-10-23 stsp {
 130 e9e01966 2023-01-18 stsp 	fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
 131 88dec179 2022-10-24 stsp 	exit(1);
 132 13b2bc37 2022-10-23 stsp }
 133 13b2bc37 2022-10-23 stsp 
 134 13b2bc37 2022-10-23 stsp static int
 135 13b2bc37 2022-10-23 stsp unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
 136 13b2bc37 2022-10-23 stsp {
 137 13b2bc37 2022-10-23 stsp 	struct sockaddr_un sun;
 138 13b2bc37 2022-10-23 stsp 	int fd = -1;
 139 13b2bc37 2022-10-23 stsp 	mode_t old_umask, mode;
 140 13b2bc37 2022-10-23 stsp 
 141 13b2bc37 2022-10-23 stsp 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
 142 13b2bc37 2022-10-23 stsp 	if (fd == -1) {
 143 13b2bc37 2022-10-23 stsp 		log_warn("socket");
 144 13b2bc37 2022-10-23 stsp 		return -1;
 145 13b2bc37 2022-10-23 stsp 	}
 146 13b2bc37 2022-10-23 stsp 
 147 13b2bc37 2022-10-23 stsp 	sun.sun_family = AF_UNIX;
 148 13b2bc37 2022-10-23 stsp 	if (strlcpy(sun.sun_path, unix_socket_path,
 149 13b2bc37 2022-10-23 stsp 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
 150 13b2bc37 2022-10-23 stsp 		log_warnx("%s: name too long", unix_socket_path);
 151 13b2bc37 2022-10-23 stsp 		close(fd);
 152 13b2bc37 2022-10-23 stsp 		return -1;
 153 13b2bc37 2022-10-23 stsp 	}
 154 13b2bc37 2022-10-23 stsp 
 155 13b2bc37 2022-10-23 stsp 	if (unlink(unix_socket_path) == -1) {
 156 13b2bc37 2022-10-23 stsp 		if (errno != ENOENT) {
 157 13b2bc37 2022-10-23 stsp 			log_warn("unlink %s", unix_socket_path);
 158 13b2bc37 2022-10-23 stsp 			close(fd);
 159 13b2bc37 2022-10-23 stsp 			return -1;
 160 13b2bc37 2022-10-23 stsp 		}
 161 13b2bc37 2022-10-23 stsp 	}
 162 13b2bc37 2022-10-23 stsp 
 163 13b2bc37 2022-10-23 stsp 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
 164 6f854dde 2023-01-04 stsp 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
 165 13b2bc37 2022-10-23 stsp 
 166 13b2bc37 2022-10-23 stsp 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
 167 13b2bc37 2022-10-23 stsp 		log_warn("bind: %s", unix_socket_path);
 168 13b2bc37 2022-10-23 stsp 		close(fd);
 169 13b2bc37 2022-10-23 stsp 		umask(old_umask);
 170 13b2bc37 2022-10-23 stsp 		return -1;
 171 13b2bc37 2022-10-23 stsp 	}
 172 13b2bc37 2022-10-23 stsp 
 173 13b2bc37 2022-10-23 stsp 	umask(old_umask);
 174 13b2bc37 2022-10-23 stsp 
 175 13b2bc37 2022-10-23 stsp 	if (chmod(unix_socket_path, mode) == -1) {
 176 13b2bc37 2022-10-23 stsp 		log_warn("chmod %o %s", mode, unix_socket_path);
 177 13b2bc37 2022-10-23 stsp 		close(fd);
 178 13b2bc37 2022-10-23 stsp 		unlink(unix_socket_path);
 179 13b2bc37 2022-10-23 stsp 		return -1;
 180 13b2bc37 2022-10-23 stsp 	}
 181 13b2bc37 2022-10-23 stsp 
 182 13b2bc37 2022-10-23 stsp 	if (chown(unix_socket_path, uid, gid) == -1) {
 183 13b2bc37 2022-10-23 stsp 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
 184 13b2bc37 2022-10-23 stsp 		close(fd);
 185 13b2bc37 2022-10-23 stsp 		unlink(unix_socket_path);
 186 13b2bc37 2022-10-23 stsp 		return -1;
 187 13b2bc37 2022-10-23 stsp 	}
 188 13b2bc37 2022-10-23 stsp 
 189 13b2bc37 2022-10-23 stsp 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
 190 13b2bc37 2022-10-23 stsp 		log_warn("listen");
 191 13b2bc37 2022-10-23 stsp 		close(fd);
 192 13b2bc37 2022-10-23 stsp 		unlink(unix_socket_path);
 193 13b2bc37 2022-10-23 stsp 		return -1;
 194 13b2bc37 2022-10-23 stsp 	}
 195 13b2bc37 2022-10-23 stsp 
 196 13b2bc37 2022-10-23 stsp 	return fd;
 197 13b2bc37 2022-10-23 stsp }
 198 13b2bc37 2022-10-23 stsp 
 199 13b2bc37 2022-10-23 stsp static uint64_t
 200 13b2bc37 2022-10-23 stsp client_hash(uint32_t client_id)
 201 13b2bc37 2022-10-23 stsp {
 202 13b2bc37 2022-10-23 stsp 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
 203 13b2bc37 2022-10-23 stsp }
 204 13b2bc37 2022-10-23 stsp 
 205 13b2bc37 2022-10-23 stsp static void
 206 13b2bc37 2022-10-23 stsp add_client(struct gotd_client *client)
 207 13b2bc37 2022-10-23 stsp {
 208 13b2bc37 2022-10-23 stsp 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
 209 13b2bc37 2022-10-23 stsp 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
 210 13b2bc37 2022-10-23 stsp 	client_cnt++;
 211 13b2bc37 2022-10-23 stsp }
 212 13b2bc37 2022-10-23 stsp 
 213 13b2bc37 2022-10-23 stsp static struct gotd_client *
 214 13b2bc37 2022-10-23 stsp find_client(uint32_t client_id)
 215 13b2bc37 2022-10-23 stsp {
 216 13b2bc37 2022-10-23 stsp 	uint64_t slot;
 217 13b2bc37 2022-10-23 stsp 	struct gotd_client *c;
 218 13b2bc37 2022-10-23 stsp 
 219 13b2bc37 2022-10-23 stsp 	slot = client_hash(client_id) % nitems(gotd_clients);
 220 13b2bc37 2022-10-23 stsp 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
 221 13b2bc37 2022-10-23 stsp 		if (c->id == client_id)
 222 13b2bc37 2022-10-23 stsp 			return c;
 223 13b2bc37 2022-10-23 stsp 	}
 224 13b2bc37 2022-10-23 stsp 
 225 13b2bc37 2022-10-23 stsp 	return NULL;
 226 13b2bc37 2022-10-23 stsp }
 227 13b2bc37 2022-10-23 stsp 
 228 b50a2b46 2022-12-29 stsp static struct gotd_client *
 229 b50a2b46 2022-12-29 stsp find_client_by_proc_fd(int fd)
 230 b50a2b46 2022-12-29 stsp {
 231 b50a2b46 2022-12-29 stsp 	uint64_t slot;
 232 b50a2b46 2022-12-29 stsp 
 233 b50a2b46 2022-12-29 stsp 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
 234 b50a2b46 2022-12-29 stsp 		struct gotd_client *c;
 235 b50a2b46 2022-12-29 stsp 
 236 b50a2b46 2022-12-29 stsp 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
 237 f7a854cf 2023-01-10 stsp 			if (c->repo && c->repo->iev.ibuf.fd == fd)
 238 b50a2b46 2022-12-29 stsp 				return c;
 239 5e25db14 2022-12-29 stsp 			if (c->auth && c->auth->iev.ibuf.fd == fd)
 240 ae7c1b78 2023-01-10 stsp 				return c;
 241 ae7c1b78 2023-01-10 stsp 			if (c->session && c->session->iev.ibuf.fd == fd)
 242 5e25db14 2022-12-29 stsp 				return c;
 243 b50a2b46 2022-12-29 stsp 		}
 244 b50a2b46 2022-12-29 stsp 	}
 245 f1752522 2022-10-29 stsp 
 246 13b2bc37 2022-10-23 stsp 	return NULL;
 247 13b2bc37 2022-10-23 stsp }
 248 13b2bc37 2022-10-23 stsp 
 249 13b2bc37 2022-10-23 stsp static int
 250 13b2bc37 2022-10-23 stsp client_is_reading(struct gotd_client *client)
 251 13b2bc37 2022-10-23 stsp {
 252 f7a854cf 2023-01-10 stsp 	return (client->required_auth &
 253 f7a854cf 2023-01-10 stsp 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
 254 13b2bc37 2022-10-23 stsp }
 255 13b2bc37 2022-10-23 stsp 
 256 13b2bc37 2022-10-23 stsp static int
 257 13b2bc37 2022-10-23 stsp client_is_writing(struct gotd_client *client)
 258 13b2bc37 2022-10-23 stsp {
 259 f7a854cf 2023-01-10 stsp 	return (client->required_auth &
 260 f7a854cf 2023-01-10 stsp 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
 261 f7a854cf 2023-01-10 stsp 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
 262 13b2bc37 2022-10-23 stsp }
 263 13b2bc37 2022-10-23 stsp 
 264 13b2bc37 2022-10-23 stsp static const struct got_error *
 265 13b2bc37 2022-10-23 stsp ensure_client_is_not_writing(struct gotd_client *client)
 266 13b2bc37 2022-10-23 stsp {
 267 13b2bc37 2022-10-23 stsp 	if (client_is_writing(client)) {
 268 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 269 13b2bc37 2022-10-23 stsp 		    "uid %d made a read-request but is writing to "
 270 13b2bc37 2022-10-23 stsp 		    "a repository", client->euid);
 271 13b2bc37 2022-10-23 stsp 	}
 272 13b2bc37 2022-10-23 stsp 
 273 13b2bc37 2022-10-23 stsp 	return NULL;
 274 13b2bc37 2022-10-23 stsp }
 275 13b2bc37 2022-10-23 stsp 
 276 13b2bc37 2022-10-23 stsp static const struct got_error *
 277 13b2bc37 2022-10-23 stsp ensure_client_is_not_reading(struct gotd_client *client)
 278 13b2bc37 2022-10-23 stsp {
 279 13b2bc37 2022-10-23 stsp 	if (client_is_reading(client)) {
 280 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 281 13b2bc37 2022-10-23 stsp 		    "uid %d made a write-request but is reading from "
 282 13b2bc37 2022-10-23 stsp 		    "a repository", client->euid);
 283 13b2bc37 2022-10-23 stsp 	}
 284 13b2bc37 2022-10-23 stsp 
 285 13b2bc37 2022-10-23 stsp 	return NULL;
 286 b50a2b46 2022-12-29 stsp }
 287 b50a2b46 2022-12-29 stsp 
 288 b50a2b46 2022-12-29 stsp static void
 289 839338f6 2023-06-22 op proc_done(struct gotd_child_proc *proc)
 290 b50a2b46 2022-12-29 stsp {
 291 839338f6 2023-06-22 op 	struct gotd_client *client;
 292 b50a2b46 2022-12-29 stsp 
 293 839338f6 2023-06-22 op 	TAILQ_REMOVE(&procs, proc, entry);
 294 b50a2b46 2022-12-29 stsp 
 295 839338f6 2023-06-22 op 	client = find_client_by_proc_fd(proc->iev.ibuf.fd);
 296 839338f6 2023-06-22 op 	if (client != NULL) {
 297 839338f6 2023-06-22 op 		if (proc == client->repo)
 298 839338f6 2023-06-22 op 			client->repo = NULL;
 299 839338f6 2023-06-22 op 		if (proc == client->auth)
 300 839338f6 2023-06-22 op 			client->auth = NULL;
 301 839338f6 2023-06-22 op 		if (proc == client->session)
 302 839338f6 2023-06-22 op 			client->session = NULL;
 303 839338f6 2023-06-22 op 		disconnect(client);
 304 839338f6 2023-06-22 op 	}
 305 ae7c1b78 2023-01-10 stsp 
 306 ba97b2d7 2024-03-20 stsp 	if (proc == gotd.notify_proc)
 307 ba97b2d7 2024-03-20 stsp 		gotd.notify_proc = NULL;
 308 ba97b2d7 2024-03-20 stsp 
 309 839338f6 2023-06-22 op 	evtimer_del(&proc->tmo);
 310 839338f6 2023-06-22 op 
 311 839338f6 2023-06-22 op 	if (proc->iev.ibuf.fd != -1) {
 312 839338f6 2023-06-22 op 		event_del(&proc->iev.ev);
 313 839338f6 2023-06-22 op 		msgbuf_clear(&proc->iev.ibuf.w);
 314 839338f6 2023-06-22 op 		close(proc->iev.ibuf.fd);
 315 839338f6 2023-06-22 op 	}
 316 839338f6 2023-06-22 op 
 317 ae7c1b78 2023-01-10 stsp 	free(proc);
 318 ba91039c 2023-06-22 op }
 319 ba91039c 2023-06-22 op 
 320 ba91039c 2023-06-22 op static void
 321 ba91039c 2023-06-22 op kill_repo_proc(struct gotd_client *client)
 322 ba91039c 2023-06-22 op {
 323 ba91039c 2023-06-22 op 	if (client->repo == NULL)
 324 ba91039c 2023-06-22 op 		return;
 325 ba91039c 2023-06-22 op 
 326 839338f6 2023-06-22 op 	kill_proc(client->repo, 0);
 327 ba91039c 2023-06-22 op 	client->repo = NULL;
 328 13b2bc37 2022-10-23 stsp }
 329 13b2bc37 2022-10-23 stsp 
 330 13b2bc37 2022-10-23 stsp static void
 331 5e25db14 2022-12-29 stsp kill_auth_proc(struct gotd_client *client)
 332 5e25db14 2022-12-29 stsp {
 333 5e25db14 2022-12-29 stsp 	if (client->auth == NULL)
 334 5e25db14 2022-12-29 stsp 		return;
 335 5e25db14 2022-12-29 stsp 
 336 839338f6 2023-06-22 op 	kill_proc(client->auth, 0);
 337 5e25db14 2022-12-29 stsp 	client->auth = NULL;
 338 5e25db14 2022-12-29 stsp }
 339 5e25db14 2022-12-29 stsp 
 340 5e25db14 2022-12-29 stsp static void
 341 ae7c1b78 2023-01-10 stsp kill_session_proc(struct gotd_client *client)
 342 ae7c1b78 2023-01-10 stsp {
 343 ae7c1b78 2023-01-10 stsp 	if (client->session == NULL)
 344 ae7c1b78 2023-01-10 stsp 		return;
 345 ae7c1b78 2023-01-10 stsp 
 346 839338f6 2023-06-22 op 	kill_proc(client->session, 0);
 347 ae7c1b78 2023-01-10 stsp 	client->session = NULL;
 348 ae7c1b78 2023-01-10 stsp }
 349 ae7c1b78 2023-01-10 stsp 
 350 ae7c1b78 2023-01-10 stsp static void
 351 13b2bc37 2022-10-23 stsp disconnect(struct gotd_client *client)
 352 13b2bc37 2022-10-23 stsp {
 353 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_disconnect idisconnect;
 354 c929736a 2023-06-22 op 	struct gotd_child_proc *listen_proc = gotd.listen_proc;
 355 13b2bc37 2022-10-23 stsp 	uint64_t slot;
 356 13b2bc37 2022-10-23 stsp 
 357 13b2bc37 2022-10-23 stsp 	log_debug("uid %d: disconnecting", client->euid);
 358 5e25db14 2022-12-29 stsp 
 359 5e25db14 2022-12-29 stsp 	kill_auth_proc(client);
 360 ae7c1b78 2023-01-10 stsp 	kill_session_proc(client);
 361 ba91039c 2023-06-22 op 	kill_repo_proc(client);
 362 d93ecf7d 2022-12-14 stsp 
 363 90270f79 2023-02-09 stsp 	idisconnect.client_id = client->id;
 364 d93ecf7d 2022-12-14 stsp 	if (gotd_imsg_compose_event(&listen_proc->iev,
 365 d93ecf7d 2022-12-14 stsp 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
 366 d93ecf7d 2022-12-14 stsp 	    &idisconnect, sizeof(idisconnect)) == -1)
 367 d93ecf7d 2022-12-14 stsp 		log_warn("imsg compose DISCONNECT");
 368 d93ecf7d 2022-12-14 stsp 
 369 13b2bc37 2022-10-23 stsp 	slot = client_hash(client->id) % nitems(gotd_clients);
 370 13b2bc37 2022-10-23 stsp 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
 371 13b2bc37 2022-10-23 stsp 	imsg_clear(&client->iev.ibuf);
 372 13b2bc37 2022-10-23 stsp 	event_del(&client->iev.ev);
 373 13b2bc37 2022-10-23 stsp 	evtimer_del(&client->tmo);
 374 ae7c1b78 2023-01-10 stsp 	if (client->fd != -1)
 375 ae7c1b78 2023-01-10 stsp 		close(client->fd);
 376 ae7c1b78 2023-01-10 stsp 	else if (client->iev.ibuf.fd != -1)
 377 ae7c1b78 2023-01-10 stsp 		close(client->iev.ibuf.fd);
 378 56624d2b 2023-12-27 stsp 	free(client->username);
 379 13b2bc37 2022-10-23 stsp 	free(client);
 380 13b2bc37 2022-10-23 stsp 	client_cnt--;
 381 13b2bc37 2022-10-23 stsp }
 382 13b2bc37 2022-10-23 stsp 
 383 13b2bc37 2022-10-23 stsp static void
 384 13b2bc37 2022-10-23 stsp disconnect_on_error(struct gotd_client *client, const struct got_error *err)
 385 13b2bc37 2022-10-23 stsp {
 386 13b2bc37 2022-10-23 stsp 	struct imsgbuf ibuf;
 387 13b2bc37 2022-10-23 stsp 
 388 1050403b 2023-08-11 stsp 	if (err->code != GOT_ERR_EOF) {
 389 1050403b 2023-08-11 stsp 		log_warnx("uid %d: %s", client->euid, err->msg);
 390 1050403b 2023-08-11 stsp 		if (client->fd != -1) {
 391 1050403b 2023-08-11 stsp 			imsg_init(&ibuf, client->fd);
 392 1050403b 2023-08-11 stsp 			gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
 393 1050403b 2023-08-11 stsp 			imsg_clear(&ibuf);
 394 1050403b 2023-08-11 stsp 		}
 395 13b2bc37 2022-10-23 stsp 	}
 396 13b2bc37 2022-10-23 stsp 	disconnect(client);
 397 f1752522 2022-10-29 stsp }
 398 f1752522 2022-10-29 stsp 
 399 f1752522 2022-10-29 stsp static const struct got_error *
 400 f1752522 2022-10-29 stsp send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
 401 f1752522 2022-10-29 stsp {
 402 f1752522 2022-10-29 stsp 	const struct got_error *err = NULL;
 403 f1752522 2022-10-29 stsp 	struct gotd_imsg_info_repo irepo;
 404 f1752522 2022-10-29 stsp 
 405 f1752522 2022-10-29 stsp 	memset(&irepo, 0, sizeof(irepo));
 406 f1752522 2022-10-29 stsp 
 407 f1752522 2022-10-29 stsp 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
 408 f1752522 2022-10-29 stsp 	    >= sizeof(irepo.repo_name))
 409 f1752522 2022-10-29 stsp 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
 410 f1752522 2022-10-29 stsp 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
 411 f1752522 2022-10-29 stsp 	    >= sizeof(irepo.repo_path))
 412 f1752522 2022-10-29 stsp 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
 413 f1752522 2022-10-29 stsp 
 414 f1752522 2022-10-29 stsp 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
 415 f1752522 2022-10-29 stsp 	    &irepo, sizeof(irepo)) == -1) {
 416 f1752522 2022-10-29 stsp 		err = got_error_from_errno("imsg compose INFO_REPO");
 417 f1752522 2022-10-29 stsp 		if (err)
 418 f1752522 2022-10-29 stsp 			return err;
 419 f1752522 2022-10-29 stsp 	}
 420 f1752522 2022-10-29 stsp 
 421 f1752522 2022-10-29 stsp 	return NULL;
 422 f1752522 2022-10-29 stsp }
 423 f1752522 2022-10-29 stsp 
 424 f1752522 2022-10-29 stsp static const struct got_error *
 425 f1752522 2022-10-29 stsp send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
 426 f1752522 2022-10-29 stsp {
 427 f1752522 2022-10-29 stsp 	const struct got_error *err = NULL;
 428 f1752522 2022-10-29 stsp 	struct gotd_imsg_info_client iclient;
 429 f1752522 2022-10-29 stsp 	struct gotd_child_proc *proc;
 430 f1752522 2022-10-29 stsp 
 431 f1752522 2022-10-29 stsp 	memset(&iclient, 0, sizeof(iclient));
 432 f1752522 2022-10-29 stsp 	iclient.euid = client->euid;
 433 f1752522 2022-10-29 stsp 	iclient.egid = client->egid;
 434 f1752522 2022-10-29 stsp 
 435 f7a854cf 2023-01-10 stsp 	proc = client->repo;
 436 f1752522 2022-10-29 stsp 	if (proc) {
 437 eec68231 2022-12-14 stsp 		if (strlcpy(iclient.repo_name, proc->repo_path,
 438 f1752522 2022-10-29 stsp 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
 439 f1752522 2022-10-29 stsp 			return got_error_msg(GOT_ERR_NO_SPACE,
 440 f1752522 2022-10-29 stsp 			    "repo name too long");
 441 f1752522 2022-10-29 stsp 		}
 442 f1752522 2022-10-29 stsp 		if (client_is_writing(client))
 443 f1752522 2022-10-29 stsp 			iclient.is_writing = 1;
 444 ae7c1b78 2023-01-10 stsp 
 445 ae7c1b78 2023-01-10 stsp 		iclient.repo_child_pid = proc->pid;
 446 f1752522 2022-10-29 stsp 	}
 447 f1752522 2022-10-29 stsp 
 448 ae7c1b78 2023-01-10 stsp 	if (client->session)
 449 ae7c1b78 2023-01-10 stsp 		iclient.session_child_pid = client->session->pid;
 450 f1752522 2022-10-29 stsp 
 451 f1752522 2022-10-29 stsp 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
 452 f1752522 2022-10-29 stsp 	    &iclient, sizeof(iclient)) == -1) {
 453 f1752522 2022-10-29 stsp 		err = got_error_from_errno("imsg compose INFO_CLIENT");
 454 f1752522 2022-10-29 stsp 		if (err)
 455 f1752522 2022-10-29 stsp 			return err;
 456 f1752522 2022-10-29 stsp 	}
 457 f1752522 2022-10-29 stsp 
 458 f1752522 2022-10-29 stsp 	return NULL;
 459 f1752522 2022-10-29 stsp }
 460 f1752522 2022-10-29 stsp 
 461 f1752522 2022-10-29 stsp static const struct got_error *
 462 f1752522 2022-10-29 stsp send_info(struct gotd_client *client)
 463 f1752522 2022-10-29 stsp {
 464 f1752522 2022-10-29 stsp 	const struct got_error *err = NULL;
 465 f1752522 2022-10-29 stsp 	struct gotd_imsg_info info;
 466 f1752522 2022-10-29 stsp 	uint64_t slot;
 467 f1752522 2022-10-29 stsp 	struct gotd_repo *repo;
 468 f1752522 2022-10-29 stsp 
 469 78433331 2023-01-04 stsp 	if (client->euid != 0)
 470 78433331 2023-01-04 stsp 		return got_error_set_errno(EPERM, "info");
 471 78433331 2023-01-04 stsp 
 472 f1752522 2022-10-29 stsp 	info.pid = gotd.pid;
 473 f1752522 2022-10-29 stsp 	info.verbosity = gotd.verbosity;
 474 f1752522 2022-10-29 stsp 	info.nrepos = gotd.nrepos;
 475 f1752522 2022-10-29 stsp 	info.nclients = client_cnt - 1;
 476 f1752522 2022-10-29 stsp 
 477 f1752522 2022-10-29 stsp 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
 478 f1752522 2022-10-29 stsp 	    &info, sizeof(info)) == -1) {
 479 f1752522 2022-10-29 stsp 		err = got_error_from_errno("imsg compose INFO");
 480 f1752522 2022-10-29 stsp 		if (err)
 481 f1752522 2022-10-29 stsp 			return err;
 482 f1752522 2022-10-29 stsp 	}
 483 f1752522 2022-10-29 stsp 
 484 f1752522 2022-10-29 stsp 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
 485 f1752522 2022-10-29 stsp 		err = send_repo_info(&client->iev, repo);
 486 f1752522 2022-10-29 stsp 		if (err)
 487 f1752522 2022-10-29 stsp 			return err;
 488 f1752522 2022-10-29 stsp 	}
 489 f1752522 2022-10-29 stsp 
 490 f1752522 2022-10-29 stsp 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
 491 f1752522 2022-10-29 stsp 		struct gotd_client *c;
 492 f1752522 2022-10-29 stsp 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
 493 f1752522 2022-10-29 stsp 			if (c->id == client->id)
 494 f1752522 2022-10-29 stsp 				continue;
 495 f1752522 2022-10-29 stsp 			err = send_client_info(&client->iev, c);
 496 f1752522 2022-10-29 stsp 			if (err)
 497 f1752522 2022-10-29 stsp 				return err;
 498 f1752522 2022-10-29 stsp 		}
 499 f1752522 2022-10-29 stsp 	}
 500 f1752522 2022-10-29 stsp 
 501 f1752522 2022-10-29 stsp 	return NULL;
 502 f1752522 2022-10-29 stsp }
 503 f1752522 2022-10-29 stsp 
 504 f1752522 2022-10-29 stsp static const struct got_error *
 505 f1752522 2022-10-29 stsp stop_gotd(struct gotd_client *client)
 506 f1752522 2022-10-29 stsp {
 507 f1752522 2022-10-29 stsp 
 508 f1752522 2022-10-29 stsp 	if (client->euid != 0)
 509 f1752522 2022-10-29 stsp 		return got_error_set_errno(EPERM, "stop");
 510 f1752522 2022-10-29 stsp 
 511 f1752522 2022-10-29 stsp 	gotd_shutdown();
 512 f1752522 2022-10-29 stsp 	/* NOTREACHED */
 513 0ccf3acb 2022-11-16 stsp 	return NULL;
 514 0ccf3acb 2022-11-16 stsp }
 515 0ccf3acb 2022-11-16 stsp 
 516 13b2bc37 2022-10-23 stsp static const struct got_error *
 517 ae7c1b78 2023-01-10 stsp start_client_authentication(struct gotd_client *client, struct imsg *imsg)
 518 13b2bc37 2022-10-23 stsp {
 519 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 520 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_list_refs ireq;
 521 0ccf3acb 2022-11-16 stsp 	struct gotd_repo *repo = NULL;
 522 13b2bc37 2022-10-23 stsp 	size_t datalen;
 523 13b2bc37 2022-10-23 stsp 
 524 13b2bc37 2022-10-23 stsp 	log_debug("list-refs request from uid %d", client->euid);
 525 13b2bc37 2022-10-23 stsp 
 526 eac23c30 2023-01-10 stsp 	if (client->state != GOTD_CLIENT_STATE_NEW)
 527 ae7c1b78 2023-01-10 stsp 		return got_error_msg(GOT_ERR_BAD_REQUEST,
 528 ae7c1b78 2023-01-10 stsp 		    "unexpected list-refs request received");
 529 ae7c1b78 2023-01-10 stsp 
 530 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 531 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(ireq))
 532 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 533 13b2bc37 2022-10-23 stsp 
 534 13b2bc37 2022-10-23 stsp 	memcpy(&ireq, imsg->data, datalen);
 535 13b2bc37 2022-10-23 stsp 
 536 13b2bc37 2022-10-23 stsp 	if (ireq.client_is_reading) {
 537 13b2bc37 2022-10-23 stsp 		err = ensure_client_is_not_writing(client);
 538 13b2bc37 2022-10-23 stsp 		if (err)
 539 13b2bc37 2022-10-23 stsp 			return err;
 540 ba97b2d7 2024-03-20 stsp 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd.repos);
 541 0ccf3acb 2022-11-16 stsp 		if (repo == NULL)
 542 0ccf3acb 2022-11-16 stsp 			return got_error(GOT_ERR_NOT_GIT_REPO);
 543 5e25db14 2022-12-29 stsp 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
 544 b50a2b46 2022-12-29 stsp 		    gotd.argv0, gotd.confpath, gotd.daemonize,
 545 b50a2b46 2022-12-29 stsp 		    gotd.verbosity);
 546 b50a2b46 2022-12-29 stsp 		if (err)
 547 b50a2b46 2022-12-29 stsp 			return err;
 548 13b2bc37 2022-10-23 stsp 	} else {
 549 13b2bc37 2022-10-23 stsp 		err = ensure_client_is_not_reading(client);
 550 0ccf3acb 2022-11-16 stsp 		if (err)
 551 0ccf3acb 2022-11-16 stsp 			return err;
 552 ba97b2d7 2024-03-20 stsp 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd.repos);
 553 0ccf3acb 2022-11-16 stsp 		if (repo == NULL)
 554 0ccf3acb 2022-11-16 stsp 			return got_error(GOT_ERR_NOT_GIT_REPO);
 555 5e25db14 2022-12-29 stsp 		err = start_auth_child(client,
 556 5e25db14 2022-12-29 stsp 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
 557 5e25db14 2022-12-29 stsp 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
 558 b50a2b46 2022-12-29 stsp 		    gotd.verbosity);
 559 b50a2b46 2022-12-29 stsp 		if (err)
 560 b50a2b46 2022-12-29 stsp 			return err;
 561 13b2bc37 2022-10-23 stsp 	}
 562 13b2bc37 2022-10-23 stsp 
 563 ae7c1b78 2023-01-10 stsp 	evtimer_add(&client->tmo, &auth_timeout);
 564 13b2bc37 2022-10-23 stsp 
 565 5fb50fce 2023-07-14 stsp 	/* Flow continues upon authentication success/failure or timeout. */
 566 13b2bc37 2022-10-23 stsp 	return NULL;
 567 13b2bc37 2022-10-23 stsp }
 568 13b2bc37 2022-10-23 stsp 
 569 13b2bc37 2022-10-23 stsp static void
 570 13b2bc37 2022-10-23 stsp gotd_request(int fd, short events, void *arg)
 571 13b2bc37 2022-10-23 stsp {
 572 13b2bc37 2022-10-23 stsp 	struct gotd_imsgev *iev = arg;
 573 13b2bc37 2022-10-23 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
 574 13b2bc37 2022-10-23 stsp 	struct gotd_client *client = iev->handler_arg;
 575 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 576 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 577 13b2bc37 2022-10-23 stsp 	ssize_t n;
 578 13b2bc37 2022-10-23 stsp 
 579 13b2bc37 2022-10-23 stsp 	if (events & EV_WRITE) {
 580 13b2bc37 2022-10-23 stsp 		while (ibuf->w.queued) {
 581 13b2bc37 2022-10-23 stsp 			n = msgbuf_write(&ibuf->w);
 582 13b2bc37 2022-10-23 stsp 			if (n == -1 && errno == EPIPE) {
 583 13b2bc37 2022-10-23 stsp 				/*
 584 13b2bc37 2022-10-23 stsp 				 * The client has closed its socket.
 585 13b2bc37 2022-10-23 stsp 				 * This can happen when Git clients are
 586 13b2bc37 2022-10-23 stsp 				 * done sending pack file data.
 587 77d0cae1 2022-12-30 op 				 */
 588 13b2bc37 2022-10-23 stsp 				msgbuf_clear(&ibuf->w);
 589 13b2bc37 2022-10-23 stsp 				continue;
 590 13b2bc37 2022-10-23 stsp 			} else if (n == -1 && errno != EAGAIN) {
 591 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("imsg_flush");
 592 13b2bc37 2022-10-23 stsp 				disconnect_on_error(client, err);
 593 13b2bc37 2022-10-23 stsp 				return;
 594 13b2bc37 2022-10-23 stsp 			}
 595 13b2bc37 2022-10-23 stsp 			if (n == 0) {
 596 13b2bc37 2022-10-23 stsp 				/* Connection closed. */
 597 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_EOF);
 598 13b2bc37 2022-10-23 stsp 				disconnect_on_error(client, err);
 599 13b2bc37 2022-10-23 stsp 				return;
 600 13b2bc37 2022-10-23 stsp 			}
 601 13b2bc37 2022-10-23 stsp 		}
 602 f1752522 2022-10-29 stsp 
 603 f1752522 2022-10-29 stsp 		/* Disconnect gotctl(8) now that messages have been sent. */
 604 f1752522 2022-10-29 stsp 		if (!client_is_reading(client) && !client_is_writing(client)) {
 605 f1752522 2022-10-29 stsp 			disconnect(client);
 606 f1752522 2022-10-29 stsp 			return;
 607 f1752522 2022-10-29 stsp 		}
 608 13b2bc37 2022-10-23 stsp 	}
 609 13b2bc37 2022-10-23 stsp 
 610 13b2bc37 2022-10-23 stsp 	if ((events & EV_READ) == 0)
 611 13b2bc37 2022-10-23 stsp 		return;
 612 13b2bc37 2022-10-23 stsp 
 613 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 614 13b2bc37 2022-10-23 stsp 
 615 13b2bc37 2022-10-23 stsp 	while (err == NULL) {
 616 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_recv(&imsg, ibuf, 0);
 617 13b2bc37 2022-10-23 stsp 		if (err) {
 618 13b2bc37 2022-10-23 stsp 			if (err->code == GOT_ERR_PRIVSEP_READ)
 619 13b2bc37 2022-10-23 stsp 				err = NULL;
 620 13b2bc37 2022-10-23 stsp 			break;
 621 13b2bc37 2022-10-23 stsp 		}
 622 13b2bc37 2022-10-23 stsp 
 623 13b2bc37 2022-10-23 stsp 		evtimer_del(&client->tmo);
 624 13b2bc37 2022-10-23 stsp 
 625 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 626 f1752522 2022-10-29 stsp 		case GOTD_IMSG_INFO:
 627 f1752522 2022-10-29 stsp 			err = send_info(client);
 628 f1752522 2022-10-29 stsp 			break;
 629 f1752522 2022-10-29 stsp 		case GOTD_IMSG_STOP:
 630 f1752522 2022-10-29 stsp 			err = stop_gotd(client);
 631 f1752522 2022-10-29 stsp 			break;
 632 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_LIST_REFS:
 633 ae7c1b78 2023-01-10 stsp 			err = start_client_authentication(client, &imsg);
 634 13b2bc37 2022-10-23 stsp 			break;
 635 13b2bc37 2022-10-23 stsp 		default:
 636 ae7c1b78 2023-01-10 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
 637 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 638 13b2bc37 2022-10-23 stsp 			break;
 639 13b2bc37 2022-10-23 stsp 		}
 640 13b2bc37 2022-10-23 stsp 
 641 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 642 13b2bc37 2022-10-23 stsp 	}
 643 13b2bc37 2022-10-23 stsp 
 644 13b2bc37 2022-10-23 stsp 	if (err) {
 645 b5225f29 2023-01-22 op 		disconnect_on_error(client, err);
 646 13b2bc37 2022-10-23 stsp 	} else {
 647 13b2bc37 2022-10-23 stsp 		gotd_imsg_event_add(&client->iev);
 648 13b2bc37 2022-10-23 stsp 	}
 649 13b2bc37 2022-10-23 stsp }
 650 13b2bc37 2022-10-23 stsp 
 651 13b2bc37 2022-10-23 stsp static void
 652 ae7c1b78 2023-01-10 stsp gotd_auth_timeout(int fd, short events, void *arg)
 653 13b2bc37 2022-10-23 stsp {
 654 13b2bc37 2022-10-23 stsp 	struct gotd_client *client = arg;
 655 13b2bc37 2022-10-23 stsp 
 656 ae7c1b78 2023-01-10 stsp 	log_debug("disconnecting uid %d due to authentication timeout",
 657 ae7c1b78 2023-01-10 stsp 	    client->euid);
 658 13b2bc37 2022-10-23 stsp 	disconnect(client);
 659 13b2bc37 2022-10-23 stsp }
 660 13b2bc37 2022-10-23 stsp 
 661 d93ecf7d 2022-12-14 stsp static const struct got_error *
 662 d93ecf7d 2022-12-14 stsp recv_connect(uint32_t *client_id, struct imsg *imsg)
 663 13b2bc37 2022-10-23 stsp {
 664 d93ecf7d 2022-12-14 stsp 	const struct got_error *err = NULL;
 665 d93ecf7d 2022-12-14 stsp 	struct gotd_imsg_connect iconnect;
 666 d93ecf7d 2022-12-14 stsp 	size_t datalen;
 667 13b2bc37 2022-10-23 stsp 	int s = -1;
 668 13b2bc37 2022-10-23 stsp 	struct gotd_client *client = NULL;
 669 13b2bc37 2022-10-23 stsp 
 670 d93ecf7d 2022-12-14 stsp 	*client_id = 0;
 671 13b2bc37 2022-10-23 stsp 
 672 d93ecf7d 2022-12-14 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 673 d93ecf7d 2022-12-14 stsp 	if (datalen != sizeof(iconnect))
 674 d93ecf7d 2022-12-14 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 675 d93ecf7d 2022-12-14 stsp 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
 676 13b2bc37 2022-10-23 stsp 
 677 2c52c623 2024-01-30 op 	s = imsg_get_fd(imsg);
 678 13b2bc37 2022-10-23 stsp 	if (s == -1) {
 679 d93ecf7d 2022-12-14 stsp 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
 680 d93ecf7d 2022-12-14 stsp 		goto done;
 681 13b2bc37 2022-10-23 stsp 	}
 682 13b2bc37 2022-10-23 stsp 
 683 d93ecf7d 2022-12-14 stsp 	if (find_client(iconnect.client_id)) {
 684 d93ecf7d 2022-12-14 stsp 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
 685 d93ecf7d 2022-12-14 stsp 		goto done;
 686 d93ecf7d 2022-12-14 stsp 	}
 687 13b2bc37 2022-10-23 stsp 
 688 13b2bc37 2022-10-23 stsp 	client = calloc(1, sizeof(*client));
 689 13b2bc37 2022-10-23 stsp 	if (client == NULL) {
 690 d93ecf7d 2022-12-14 stsp 		err = got_error_from_errno("calloc");
 691 d93ecf7d 2022-12-14 stsp 		goto done;
 692 13b2bc37 2022-10-23 stsp 	}
 693 13b2bc37 2022-10-23 stsp 
 694 d93ecf7d 2022-12-14 stsp 	*client_id = iconnect.client_id;
 695 d93ecf7d 2022-12-14 stsp 
 696 eac23c30 2023-01-10 stsp 	client->state = GOTD_CLIENT_STATE_NEW;
 697 d93ecf7d 2022-12-14 stsp 	client->id = iconnect.client_id;
 698 13b2bc37 2022-10-23 stsp 	client->fd = s;
 699 13b2bc37 2022-10-23 stsp 	s = -1;
 700 365cf0f3 2022-12-29 stsp 	/* The auth process will verify UID/GID for us. */
 701 365cf0f3 2022-12-29 stsp 	client->euid = iconnect.euid;
 702 365cf0f3 2022-12-29 stsp 	client->egid = iconnect.egid;
 703 13b2bc37 2022-10-23 stsp 
 704 13b2bc37 2022-10-23 stsp 	imsg_init(&client->iev.ibuf, client->fd);
 705 13b2bc37 2022-10-23 stsp 	client->iev.handler = gotd_request;
 706 13b2bc37 2022-10-23 stsp 	client->iev.events = EV_READ;
 707 13b2bc37 2022-10-23 stsp 	client->iev.handler_arg = client;
 708 13b2bc37 2022-10-23 stsp 
 709 13b2bc37 2022-10-23 stsp 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
 710 13b2bc37 2022-10-23 stsp 	    &client->iev);
 711 13b2bc37 2022-10-23 stsp 	gotd_imsg_event_add(&client->iev);
 712 13b2bc37 2022-10-23 stsp 
 713 ae7c1b78 2023-01-10 stsp 	evtimer_set(&client->tmo, gotd_auth_timeout, client);
 714 13b2bc37 2022-10-23 stsp 
 715 13b2bc37 2022-10-23 stsp 	add_client(client);
 716 13b2bc37 2022-10-23 stsp 	log_debug("%s: new client uid %d connected on fd %d", __func__,
 717 13b2bc37 2022-10-23 stsp 	    client->euid, client->fd);
 718 d93ecf7d 2022-12-14 stsp done:
 719 d93ecf7d 2022-12-14 stsp 	if (err) {
 720 c929736a 2023-06-22 op 		struct gotd_child_proc *listen_proc = gotd.listen_proc;
 721 d93ecf7d 2022-12-14 stsp 		struct gotd_imsg_disconnect idisconnect;
 722 13b2bc37 2022-10-23 stsp 
 723 d93ecf7d 2022-12-14 stsp 		idisconnect.client_id = client->id;
 724 d93ecf7d 2022-12-14 stsp 		if (gotd_imsg_compose_event(&listen_proc->iev,
 725 d93ecf7d 2022-12-14 stsp 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
 726 d93ecf7d 2022-12-14 stsp 		    &idisconnect, sizeof(idisconnect)) == -1)
 727 d93ecf7d 2022-12-14 stsp 			log_warn("imsg compose DISCONNECT");
 728 d93ecf7d 2022-12-14 stsp 
 729 d93ecf7d 2022-12-14 stsp 		if (s != -1)
 730 d93ecf7d 2022-12-14 stsp 			close(s);
 731 d93ecf7d 2022-12-14 stsp 	}
 732 d93ecf7d 2022-12-14 stsp 
 733 d93ecf7d 2022-12-14 stsp 	return err;
 734 13b2bc37 2022-10-23 stsp }
 735 13b2bc37 2022-10-23 stsp 
 736 13b2bc37 2022-10-23 stsp static const char *gotd_proc_names[PROC_MAX] = {
 737 13b2bc37 2022-10-23 stsp 	"parent",
 738 d93ecf7d 2022-12-14 stsp 	"listen",
 739 5e25db14 2022-12-29 stsp 	"auth",
 740 ce986f22 2023-06-19 stsp 	"session_read",
 741 ce986f22 2023-06-19 stsp 	"session_write",
 742 13b2bc37 2022-10-23 stsp 	"repo_read",
 743 4b3827cd 2023-07-08 stsp 	"repo_write",
 744 ba97b2d7 2024-03-20 stsp 	"gitwrapper",
 745 ba97b2d7 2024-03-20 stsp 	"notify"
 746 13b2bc37 2022-10-23 stsp };
 747 13b2bc37 2022-10-23 stsp 
 748 13b2bc37 2022-10-23 stsp static void
 749 13b2bc37 2022-10-23 stsp kill_proc(struct gotd_child_proc *proc, int fatal)
 750 13b2bc37 2022-10-23 stsp {
 751 839338f6 2023-06-22 op 	struct timeval tv = { 5, 0 };
 752 839338f6 2023-06-22 op 
 753 839338f6 2023-06-22 op 	log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
 754 839338f6 2023-06-22 op 
 755 839338f6 2023-06-22 op 	if (proc->iev.ibuf.fd != -1) {
 756 839338f6 2023-06-22 op 		event_del(&proc->iev.ev);
 757 839338f6 2023-06-22 op 		msgbuf_clear(&proc->iev.ibuf.w);
 758 839338f6 2023-06-22 op 		close(proc->iev.ibuf.fd);
 759 839338f6 2023-06-22 op 		proc->iev.ibuf.fd = -1;
 760 839338f6 2023-06-22 op 	}
 761 839338f6 2023-06-22 op 
 762 839338f6 2023-06-22 op 	if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
 763 839338f6 2023-06-22 op 		evtimer_add(&proc->tmo, &tv);
 764 839338f6 2023-06-22 op 
 765 13b2bc37 2022-10-23 stsp 	if (fatal) {
 766 13b2bc37 2022-10-23 stsp 		log_warnx("sending SIGKILL to PID %d", proc->pid);
 767 13b2bc37 2022-10-23 stsp 		kill(proc->pid, SIGKILL);
 768 13b2bc37 2022-10-23 stsp 	} else
 769 13b2bc37 2022-10-23 stsp 		kill(proc->pid, SIGTERM);
 770 13b2bc37 2022-10-23 stsp }
 771 13b2bc37 2022-10-23 stsp 
 772 13b2bc37 2022-10-23 stsp static void
 773 839338f6 2023-06-22 op kill_proc_timeout(int fd, short ev, void *d)
 774 839338f6 2023-06-22 op {
 775 839338f6 2023-06-22 op 	struct gotd_child_proc *proc = d;
 776 839338f6 2023-06-22 op 
 777 839338f6 2023-06-22 op 	log_warnx("timeout waiting for PID %d to terminate;"
 778 839338f6 2023-06-22 op 	    " retrying with force", proc->pid);
 779 839338f6 2023-06-22 op 	kill_proc(proc, 1);
 780 839338f6 2023-06-22 op }
 781 839338f6 2023-06-22 op 
 782 839338f6 2023-06-22 op static void
 783 13b2bc37 2022-10-23 stsp gotd_shutdown(void)
 784 13b2bc37 2022-10-23 stsp {
 785 b50a2b46 2022-12-29 stsp 	uint64_t slot;
 786 13b2bc37 2022-10-23 stsp 
 787 ae7c1b78 2023-01-10 stsp 	log_debug("shutting down");
 788 b50a2b46 2022-12-29 stsp 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
 789 b50a2b46 2022-12-29 stsp 		struct gotd_client *c, *tmp;
 790 b50a2b46 2022-12-29 stsp 
 791 b50a2b46 2022-12-29 stsp 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
 792 b50a2b46 2022-12-29 stsp 			disconnect(c);
 793 13b2bc37 2022-10-23 stsp 	}
 794 13b2bc37 2022-10-23 stsp 
 795 839338f6 2023-06-22 op 	kill_proc(gotd.listen_proc, 0);
 796 13b2bc37 2022-10-23 stsp 
 797 13b2bc37 2022-10-23 stsp 	log_info("terminating");
 798 13b2bc37 2022-10-23 stsp 	exit(0);
 799 13b2bc37 2022-10-23 stsp }
 800 13b2bc37 2022-10-23 stsp 
 801 839338f6 2023-06-22 op static struct gotd_child_proc *
 802 839338f6 2023-06-22 op find_proc_by_pid(pid_t pid)
 803 839338f6 2023-06-22 op {
 804 839338f6 2023-06-22 op 	struct gotd_child_proc *proc = NULL;
 805 839338f6 2023-06-22 op 
 806 839338f6 2023-06-22 op 	TAILQ_FOREACH(proc, &procs, entry)
 807 839338f6 2023-06-22 op 		if (proc->pid == pid)
 808 839338f6 2023-06-22 op 			break;
 809 839338f6 2023-06-22 op 
 810 839338f6 2023-06-22 op 	return proc;
 811 839338f6 2023-06-22 op }
 812 839338f6 2023-06-22 op 
 813 13b2bc37 2022-10-23 stsp void
 814 13b2bc37 2022-10-23 stsp gotd_sighdlr(int sig, short event, void *arg)
 815 13b2bc37 2022-10-23 stsp {
 816 839338f6 2023-06-22 op 	struct gotd_child_proc *proc;
 817 839338f6 2023-06-22 op 	pid_t pid;
 818 839338f6 2023-06-22 op 	int status;
 819 839338f6 2023-06-22 op 
 820 13b2bc37 2022-10-23 stsp 	/*
 821 13b2bc37 2022-10-23 stsp 	 * Normal signal handler rules don't apply because libevent
 822 13b2bc37 2022-10-23 stsp 	 * decouples for us.
 823 13b2bc37 2022-10-23 stsp 	 */
 824 13b2bc37 2022-10-23 stsp 
 825 13b2bc37 2022-10-23 stsp 	switch (sig) {
 826 13b2bc37 2022-10-23 stsp 	case SIGHUP:
 827 13b2bc37 2022-10-23 stsp 		log_info("%s: ignoring SIGHUP", __func__);
 828 13b2bc37 2022-10-23 stsp 		break;
 829 13b2bc37 2022-10-23 stsp 	case SIGUSR1:
 830 13b2bc37 2022-10-23 stsp 		log_info("%s: ignoring SIGUSR1", __func__);
 831 13b2bc37 2022-10-23 stsp 		break;
 832 13b2bc37 2022-10-23 stsp 	case SIGTERM:
 833 13b2bc37 2022-10-23 stsp 	case SIGINT:
 834 13b2bc37 2022-10-23 stsp 		gotd_shutdown();
 835 13b2bc37 2022-10-23 stsp 		break;
 836 839338f6 2023-06-22 op 	case SIGCHLD:
 837 839338f6 2023-06-22 op 		for (;;) {
 838 839338f6 2023-06-22 op 			pid = waitpid(WAIT_ANY, &status, WNOHANG);
 839 839338f6 2023-06-22 op 			if (pid == -1) {
 840 839338f6 2023-06-22 op 				if (errno == EINTR)
 841 839338f6 2023-06-22 op 					continue;
 842 839338f6 2023-06-22 op 				if (errno == ECHILD)
 843 839338f6 2023-06-22 op 					break;
 844 839338f6 2023-06-22 op 				fatal("waitpid");
 845 839338f6 2023-06-22 op 			}
 846 839338f6 2023-06-22 op 			if (pid == 0)
 847 839338f6 2023-06-22 op 				break;
 848 839338f6 2023-06-22 op 
 849 839338f6 2023-06-22 op 			log_debug("reaped pid %d", pid);
 850 839338f6 2023-06-22 op 			proc = find_proc_by_pid(pid);
 851 839338f6 2023-06-22 op 			if (proc == NULL) {
 852 839338f6 2023-06-22 op 				log_info("caught exit of unknown child %d",
 853 839338f6 2023-06-22 op 				    pid);
 854 839338f6 2023-06-22 op 				continue;
 855 839338f6 2023-06-22 op 			}
 856 839338f6 2023-06-22 op 
 857 839338f6 2023-06-22 op 			if (WIFSIGNALED(status)) {
 858 839338f6 2023-06-22 op 				log_warnx("child PID %d terminated with"
 859 839338f6 2023-06-22 op 				    " signal %d", pid, WTERMSIG(status));
 860 839338f6 2023-06-22 op 			}
 861 839338f6 2023-06-22 op 
 862 839338f6 2023-06-22 op 			proc_done(proc);
 863 839338f6 2023-06-22 op 		}
 864 839338f6 2023-06-22 op 		break;
 865 13b2bc37 2022-10-23 stsp 	default:
 866 13b2bc37 2022-10-23 stsp 		fatalx("unexpected signal");
 867 13b2bc37 2022-10-23 stsp 	}
 868 13b2bc37 2022-10-23 stsp }
 869 13b2bc37 2022-10-23 stsp 
 870 13b2bc37 2022-10-23 stsp static const struct got_error *
 871 13b2bc37 2022-10-23 stsp ensure_proc_is_reading(struct gotd_client *client,
 872 13b2bc37 2022-10-23 stsp     struct gotd_child_proc *proc)
 873 13b2bc37 2022-10-23 stsp {
 874 13b2bc37 2022-10-23 stsp 	if (!client_is_reading(client)) {
 875 13b2bc37 2022-10-23 stsp 		kill_proc(proc, 1);
 876 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 877 13b2bc37 2022-10-23 stsp 		    "PID %d handled a read-request for uid %d but this "
 878 13b2bc37 2022-10-23 stsp 		    "user is not reading from a repository", proc->pid,
 879 13b2bc37 2022-10-23 stsp 		    client->euid);
 880 13b2bc37 2022-10-23 stsp 	}
 881 13b2bc37 2022-10-23 stsp 
 882 13b2bc37 2022-10-23 stsp 	return NULL;
 883 13b2bc37 2022-10-23 stsp }
 884 13b2bc37 2022-10-23 stsp 
 885 13b2bc37 2022-10-23 stsp static const struct got_error *
 886 13b2bc37 2022-10-23 stsp ensure_proc_is_writing(struct gotd_client *client,
 887 13b2bc37 2022-10-23 stsp     struct gotd_child_proc *proc)
 888 13b2bc37 2022-10-23 stsp {
 889 13b2bc37 2022-10-23 stsp 	if (!client_is_writing(client)) {
 890 13b2bc37 2022-10-23 stsp 		kill_proc(proc, 1);
 891 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 892 13b2bc37 2022-10-23 stsp 		    "PID %d handled a write-request for uid %d but this "
 893 13b2bc37 2022-10-23 stsp 		    "user is not writing to a repository", proc->pid,
 894 13b2bc37 2022-10-23 stsp 		    client->euid);
 895 13b2bc37 2022-10-23 stsp 	}
 896 13b2bc37 2022-10-23 stsp 
 897 13b2bc37 2022-10-23 stsp 	return NULL;
 898 13b2bc37 2022-10-23 stsp }
 899 13b2bc37 2022-10-23 stsp 
 900 13b2bc37 2022-10-23 stsp static int
 901 13b2bc37 2022-10-23 stsp verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
 902 13b2bc37 2022-10-23 stsp     struct imsg *imsg)
 903 13b2bc37 2022-10-23 stsp {
 904 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 905 13b2bc37 2022-10-23 stsp 	int ret = 0;
 906 13b2bc37 2022-10-23 stsp 
 907 d93ecf7d 2022-12-14 stsp 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
 908 f7a854cf 2023-01-10 stsp 		if (client->repo == NULL)
 909 d93ecf7d 2022-12-14 stsp 			fatalx("no process found for uid %d", client->euid);
 910 f7a854cf 2023-01-10 stsp 		if (proc->pid != client->repo->pid) {
 911 d93ecf7d 2022-12-14 stsp 			kill_proc(proc, 1);
 912 d93ecf7d 2022-12-14 stsp 			log_warnx("received message from PID %d for uid %d, "
 913 d93ecf7d 2022-12-14 stsp 			    "while PID %d is the process serving this user",
 914 f7a854cf 2023-01-10 stsp 			    proc->pid, client->euid, client->repo->pid);
 915 ae7c1b78 2023-01-10 stsp 			return 0;
 916 ae7c1b78 2023-01-10 stsp 		}
 917 ae7c1b78 2023-01-10 stsp 	}
 918 b0614828 2023-06-19 stsp 	if (proc->type == PROC_SESSION_READ ||
 919 b0614828 2023-06-19 stsp 	    proc->type == PROC_SESSION_WRITE) {
 920 ae7c1b78 2023-01-10 stsp 		if (client->session == NULL) {
 921 ae7c1b78 2023-01-10 stsp 			log_warnx("no session found for uid %d", client->euid);
 922 d93ecf7d 2022-12-14 stsp 			return 0;
 923 d93ecf7d 2022-12-14 stsp 		}
 924 ae7c1b78 2023-01-10 stsp 		if (proc->pid != client->session->pid) {
 925 ae7c1b78 2023-01-10 stsp 			kill_proc(proc, 1);
 926 ae7c1b78 2023-01-10 stsp 			log_warnx("received message from PID %d for uid %d, "
 927 ae7c1b78 2023-01-10 stsp 			    "while PID %d is the process serving this user",
 928 ae7c1b78 2023-01-10 stsp 			    proc->pid, client->euid, client->session->pid);
 929 ae7c1b78 2023-01-10 stsp 			return 0;
 930 ae7c1b78 2023-01-10 stsp 		}
 931 13b2bc37 2022-10-23 stsp 	}
 932 13b2bc37 2022-10-23 stsp 
 933 13b2bc37 2022-10-23 stsp 	switch (imsg->hdr.type) {
 934 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_ERROR:
 935 13b2bc37 2022-10-23 stsp 		ret = 1;
 936 13b2bc37 2022-10-23 stsp 		break;
 937 d93ecf7d 2022-12-14 stsp 	case GOTD_IMSG_CONNECT:
 938 d93ecf7d 2022-12-14 stsp 		if (proc->type != PROC_LISTEN) {
 939 d93ecf7d 2022-12-14 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 940 d93ecf7d 2022-12-14 stsp 			    "new connection for uid %d from PID %d "
 941 d93ecf7d 2022-12-14 stsp 			    "which is not the listen process",
 942 76a9a38e 2023-12-27 stsp 			    client->euid, proc->pid);
 943 5e25db14 2022-12-29 stsp 		} else
 944 5e25db14 2022-12-29 stsp 			ret = 1;
 945 5e25db14 2022-12-29 stsp 		break;
 946 5e25db14 2022-12-29 stsp 	case GOTD_IMSG_ACCESS_GRANTED:
 947 5e25db14 2022-12-29 stsp 		if (proc->type != PROC_AUTH) {
 948 5e25db14 2022-12-29 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 949 5e25db14 2022-12-29 stsp 			    "authentication of uid %d from PID %d "
 950 5e25db14 2022-12-29 stsp 			    "which is not the auth process",
 951 76a9a38e 2023-12-27 stsp 			    client->euid, proc->pid);
 952 d93ecf7d 2022-12-14 stsp 		} else
 953 d93ecf7d 2022-12-14 stsp 			ret = 1;
 954 d93ecf7d 2022-12-14 stsp 		break;
 955 ae7c1b78 2023-01-10 stsp 	case GOTD_IMSG_CLIENT_SESSION_READY:
 956 b0614828 2023-06-19 stsp 		if (proc->type != PROC_SESSION_READ &&
 957 b0614828 2023-06-19 stsp 		    proc->type != PROC_SESSION_WRITE) {
 958 ae7c1b78 2023-01-10 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 959 ae7c1b78 2023-01-10 stsp 			    "unexpected \"ready\" signal from PID %d",
 960 ae7c1b78 2023-01-10 stsp 			    proc->pid);
 961 ae7c1b78 2023-01-10 stsp 		} else
 962 ae7c1b78 2023-01-10 stsp 			ret = 1;
 963 ae7c1b78 2023-01-10 stsp 		break;
 964 b50a2b46 2022-12-29 stsp 	case GOTD_IMSG_REPO_CHILD_READY:
 965 b50a2b46 2022-12-29 stsp 		if (proc->type != PROC_REPO_READ &&
 966 b50a2b46 2022-12-29 stsp 		    proc->type != PROC_REPO_WRITE) {
 967 b50a2b46 2022-12-29 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 968 b50a2b46 2022-12-29 stsp 			    "unexpected \"ready\" signal from PID %d",
 969 b50a2b46 2022-12-29 stsp 			    proc->pid);
 970 b50a2b46 2022-12-29 stsp 		} else
 971 b50a2b46 2022-12-29 stsp 			ret = 1;
 972 b50a2b46 2022-12-29 stsp 		break;
 973 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_PACKFILE_DONE:
 974 13b2bc37 2022-10-23 stsp 		err = ensure_proc_is_reading(client, proc);
 975 13b2bc37 2022-10-23 stsp 		if (err)
 976 13b2bc37 2022-10-23 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
 977 13b2bc37 2022-10-23 stsp 		else
 978 13b2bc37 2022-10-23 stsp 			ret = 1;
 979 13b2bc37 2022-10-23 stsp 		break;
 980 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_PACKFILE_INSTALL:
 981 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_REF_UPDATES_START:
 982 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_REF_UPDATE:
 983 13b2bc37 2022-10-23 stsp 		err = ensure_proc_is_writing(client, proc);
 984 13b2bc37 2022-10-23 stsp 		if (err)
 985 13b2bc37 2022-10-23 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
 986 13b2bc37 2022-10-23 stsp 		else
 987 13b2bc37 2022-10-23 stsp 			ret = 1;
 988 13b2bc37 2022-10-23 stsp 		break;
 989 13b2bc37 2022-10-23 stsp 	default:
 990 13b2bc37 2022-10-23 stsp 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
 991 13b2bc37 2022-10-23 stsp 		break;
 992 13b2bc37 2022-10-23 stsp 	}
 993 13b2bc37 2022-10-23 stsp 
 994 13b2bc37 2022-10-23 stsp 	return ret;
 995 13b2bc37 2022-10-23 stsp }
 996 13b2bc37 2022-10-23 stsp 
 997 13b2bc37 2022-10-23 stsp static const struct got_error *
 998 ae7c1b78 2023-01-10 stsp connect_repo_child(struct gotd_client *client,
 999 ae7c1b78 2023-01-10 stsp     struct gotd_child_proc *repo_proc)
1000 b50a2b46 2022-12-29 stsp {
1001 b50a2b46 2022-12-29 stsp 	static const struct got_error *err;
1002 ae7c1b78 2023-01-10 stsp 	struct gotd_imsgev *session_iev = &client->session->iev;
1003 ae7c1b78 2023-01-10 stsp 	struct gotd_imsg_connect_repo_child ireq;
1004 ae7c1b78 2023-01-10 stsp 	int pipe[2];
1005 b50a2b46 2022-12-29 stsp 
1006 eac23c30 2023-01-10 stsp 	if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
1007 ae7c1b78 2023-01-10 stsp 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1008 ae7c1b78 2023-01-10 stsp 		    "unexpected repo child ready signal received");
1009 b50a2b46 2022-12-29 stsp 
1010 ae7c1b78 2023-01-10 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1011 ae7c1b78 2023-01-10 stsp 	    PF_UNSPEC, pipe) == -1)
1012 ae7c1b78 2023-01-10 stsp 		fatal("socketpair");
1013 b50a2b46 2022-12-29 stsp 
1014 ae7c1b78 2023-01-10 stsp 	memset(&ireq, 0, sizeof(ireq));
1015 ae7c1b78 2023-01-10 stsp 	ireq.proc_id = repo_proc->type;
1016 13b2bc37 2022-10-23 stsp 
1017 ae7c1b78 2023-01-10 stsp 	/* Pass repo child pipe to session child process. */
1018 ae7c1b78 2023-01-10 stsp 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1019 ae7c1b78 2023-01-10 stsp 	    PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1020 ae7c1b78 2023-01-10 stsp 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1021 ae7c1b78 2023-01-10 stsp 		close(pipe[0]);
1022 ae7c1b78 2023-01-10 stsp 		close(pipe[1]);
1023 ae7c1b78 2023-01-10 stsp 		return err;
1024 13b2bc37 2022-10-23 stsp 	}
1025 13b2bc37 2022-10-23 stsp 
1026 ae7c1b78 2023-01-10 stsp 	/* Pass session child pipe to repo child process. */
1027 ae7c1b78 2023-01-10 stsp 	if (gotd_imsg_compose_event(&repo_proc->iev,
1028 ae7c1b78 2023-01-10 stsp 	    GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1029 ae7c1b78 2023-01-10 stsp 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1030 ae7c1b78 2023-01-10 stsp 		close(pipe[1]);
1031 ae7c1b78 2023-01-10 stsp 		return err;
1032 13b2bc37 2022-10-23 stsp 	}
1033 13b2bc37 2022-10-23 stsp 
1034 13b2bc37 2022-10-23 stsp 	return NULL;
1035 13b2bc37 2022-10-23 stsp }
1036 13b2bc37 2022-10-23 stsp 
1037 13b2bc37 2022-10-23 stsp static void
1038 b50a2b46 2022-12-29 stsp gotd_dispatch_listener(int fd, short event, void *arg)
1039 13b2bc37 2022-10-23 stsp {
1040 13b2bc37 2022-10-23 stsp 	struct gotd_imsgev *iev = arg;
1041 13b2bc37 2022-10-23 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1042 c929736a 2023-06-22 op 	struct gotd_child_proc *proc = gotd.listen_proc;
1043 b50a2b46 2022-12-29 stsp 	ssize_t n;
1044 b50a2b46 2022-12-29 stsp 	int shut = 0;
1045 b50a2b46 2022-12-29 stsp 	struct imsg imsg;
1046 b50a2b46 2022-12-29 stsp 
1047 b50a2b46 2022-12-29 stsp 	if (proc->iev.ibuf.fd != fd)
1048 b50a2b46 2022-12-29 stsp 		fatalx("%s: unexpected fd %d", __func__, fd);
1049 b50a2b46 2022-12-29 stsp 
1050 b50a2b46 2022-12-29 stsp 	if (event & EV_READ) {
1051 b50a2b46 2022-12-29 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1052 b50a2b46 2022-12-29 stsp 			fatal("imsg_read error");
1053 b50a2b46 2022-12-29 stsp 		if (n == 0) {
1054 b50a2b46 2022-12-29 stsp 			/* Connection closed. */
1055 b50a2b46 2022-12-29 stsp 			shut = 1;
1056 b50a2b46 2022-12-29 stsp 			goto done;
1057 b50a2b46 2022-12-29 stsp 		}
1058 b50a2b46 2022-12-29 stsp 	}
1059 b50a2b46 2022-12-29 stsp 
1060 b50a2b46 2022-12-29 stsp 	if (event & EV_WRITE) {
1061 b50a2b46 2022-12-29 stsp 		n = msgbuf_write(&ibuf->w);
1062 b50a2b46 2022-12-29 stsp 		if (n == -1 && errno != EAGAIN)
1063 b50a2b46 2022-12-29 stsp 			fatal("msgbuf_write");
1064 b50a2b46 2022-12-29 stsp 		if (n == 0) {
1065 b50a2b46 2022-12-29 stsp 			/* Connection closed. */
1066 b50a2b46 2022-12-29 stsp 			shut = 1;
1067 b50a2b46 2022-12-29 stsp 			goto done;
1068 b50a2b46 2022-12-29 stsp 		}
1069 b50a2b46 2022-12-29 stsp 	}
1070 b50a2b46 2022-12-29 stsp 
1071 b50a2b46 2022-12-29 stsp 	for (;;) {
1072 b50a2b46 2022-12-29 stsp 		const struct got_error *err = NULL;
1073 b50a2b46 2022-12-29 stsp 		struct gotd_client *client = NULL;
1074 b50a2b46 2022-12-29 stsp 		uint32_t client_id = 0;
1075 b50a2b46 2022-12-29 stsp 		int do_disconnect = 0;
1076 b50a2b46 2022-12-29 stsp 
1077 b50a2b46 2022-12-29 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1078 b50a2b46 2022-12-29 stsp 			fatal("%s: imsg_get error", __func__);
1079 b50a2b46 2022-12-29 stsp 		if (n == 0)	/* No more messages. */
1080 b50a2b46 2022-12-29 stsp 			break;
1081 b50a2b46 2022-12-29 stsp 
1082 b50a2b46 2022-12-29 stsp 		switch (imsg.hdr.type) {
1083 b50a2b46 2022-12-29 stsp 		case GOTD_IMSG_ERROR:
1084 b50a2b46 2022-12-29 stsp 			do_disconnect = 1;
1085 b50a2b46 2022-12-29 stsp 			err = gotd_imsg_recv_error(&client_id, &imsg);
1086 b50a2b46 2022-12-29 stsp 			break;
1087 b50a2b46 2022-12-29 stsp 		case GOTD_IMSG_CONNECT:
1088 b50a2b46 2022-12-29 stsp 			err = recv_connect(&client_id, &imsg);
1089 b50a2b46 2022-12-29 stsp 			break;
1090 b50a2b46 2022-12-29 stsp 		default:
1091 b50a2b46 2022-12-29 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1092 b50a2b46 2022-12-29 stsp 			break;
1093 b50a2b46 2022-12-29 stsp 		}
1094 b50a2b46 2022-12-29 stsp 
1095 b50a2b46 2022-12-29 stsp 		client = find_client(client_id);
1096 b50a2b46 2022-12-29 stsp 		if (client == NULL) {
1097 b50a2b46 2022-12-29 stsp 			log_warnx("%s: client not found", __func__);
1098 b50a2b46 2022-12-29 stsp 			imsg_free(&imsg);
1099 b50a2b46 2022-12-29 stsp 			continue;
1100 b50a2b46 2022-12-29 stsp 		}
1101 b50a2b46 2022-12-29 stsp 
1102 b50a2b46 2022-12-29 stsp 		if (err)
1103 b50a2b46 2022-12-29 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
1104 b50a2b46 2022-12-29 stsp 
1105 b50a2b46 2022-12-29 stsp 		if (do_disconnect) {
1106 b50a2b46 2022-12-29 stsp 			if (err)
1107 b50a2b46 2022-12-29 stsp 				disconnect_on_error(client, err);
1108 b50a2b46 2022-12-29 stsp 			else
1109 b50a2b46 2022-12-29 stsp 				disconnect(client);
1110 b50a2b46 2022-12-29 stsp 		}
1111 b50a2b46 2022-12-29 stsp 
1112 b50a2b46 2022-12-29 stsp 		imsg_free(&imsg);
1113 b50a2b46 2022-12-29 stsp 	}
1114 b50a2b46 2022-12-29 stsp done:
1115 b50a2b46 2022-12-29 stsp 	if (!shut) {
1116 b50a2b46 2022-12-29 stsp 		gotd_imsg_event_add(iev);
1117 b50a2b46 2022-12-29 stsp 	} else {
1118 b50a2b46 2022-12-29 stsp 		/* This pipe is dead. Remove its event handler */
1119 b50a2b46 2022-12-29 stsp 		event_del(&iev->ev);
1120 b50a2b46 2022-12-29 stsp 		event_loopexit(NULL);
1121 b50a2b46 2022-12-29 stsp 	}
1122 b50a2b46 2022-12-29 stsp }
1123 b50a2b46 2022-12-29 stsp 
1124 b50a2b46 2022-12-29 stsp static void
1125 ba97b2d7 2024-03-20 stsp gotd_dispatch_notifier(int fd, short event, void *arg)
1126 ba97b2d7 2024-03-20 stsp {
1127 ba97b2d7 2024-03-20 stsp 	struct gotd_imsgev *iev = arg;
1128 ba97b2d7 2024-03-20 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1129 ba97b2d7 2024-03-20 stsp 	struct gotd_child_proc *proc = gotd.notify_proc;
1130 ba97b2d7 2024-03-20 stsp 	ssize_t n;
1131 ba97b2d7 2024-03-20 stsp 	int shut = 0;
1132 ba97b2d7 2024-03-20 stsp 	struct imsg imsg;
1133 ba97b2d7 2024-03-20 stsp 
1134 ba97b2d7 2024-03-20 stsp 	if (proc->iev.ibuf.fd != fd)
1135 ba97b2d7 2024-03-20 stsp 		fatalx("%s: unexpected fd %d", __func__, fd);
1136 ba97b2d7 2024-03-20 stsp 
1137 ba97b2d7 2024-03-20 stsp 	if (event & EV_READ) {
1138 ba97b2d7 2024-03-20 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1139 ba97b2d7 2024-03-20 stsp 			fatal("imsg_read error");
1140 ba97b2d7 2024-03-20 stsp 		if (n == 0) {
1141 ba97b2d7 2024-03-20 stsp 			/* Connection closed. */
1142 ba97b2d7 2024-03-20 stsp 			shut = 1;
1143 ba97b2d7 2024-03-20 stsp 			goto done;
1144 ba97b2d7 2024-03-20 stsp 		}
1145 ba97b2d7 2024-03-20 stsp 	}
1146 ba97b2d7 2024-03-20 stsp 
1147 ba97b2d7 2024-03-20 stsp 	if (event & EV_WRITE) {
1148 ba97b2d7 2024-03-20 stsp 		n = msgbuf_write(&ibuf->w);
1149 ba97b2d7 2024-03-20 stsp 		if (n == -1 && errno != EAGAIN)
1150 ba97b2d7 2024-03-20 stsp 			fatal("msgbuf_write");
1151 ba97b2d7 2024-03-20 stsp 		if (n == 0) {
1152 ba97b2d7 2024-03-20 stsp 			/* Connection closed. */
1153 ba97b2d7 2024-03-20 stsp 			shut = 1;
1154 ba97b2d7 2024-03-20 stsp 			goto done;
1155 ba97b2d7 2024-03-20 stsp 		}
1156 ba97b2d7 2024-03-20 stsp 	}
1157 ba97b2d7 2024-03-20 stsp 
1158 ba97b2d7 2024-03-20 stsp 	for (;;) {
1159 ba97b2d7 2024-03-20 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1160 ba97b2d7 2024-03-20 stsp 			fatal("%s: imsg_get error", __func__);
1161 ba97b2d7 2024-03-20 stsp 		if (n == 0)	/* No more messages. */
1162 ba97b2d7 2024-03-20 stsp 			break;
1163 ba97b2d7 2024-03-20 stsp 
1164 ba97b2d7 2024-03-20 stsp 		switch (imsg.hdr.type) {
1165 ba97b2d7 2024-03-20 stsp 		default:
1166 ba97b2d7 2024-03-20 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1167 ba97b2d7 2024-03-20 stsp 			break;
1168 ba97b2d7 2024-03-20 stsp 		}
1169 ba97b2d7 2024-03-20 stsp 
1170 ba97b2d7 2024-03-20 stsp 		imsg_free(&imsg);
1171 ba97b2d7 2024-03-20 stsp 	}
1172 ba97b2d7 2024-03-20 stsp done:
1173 ba97b2d7 2024-03-20 stsp 	if (!shut) {
1174 ba97b2d7 2024-03-20 stsp 		gotd_imsg_event_add(iev);
1175 ba97b2d7 2024-03-20 stsp 	} else {
1176 ba97b2d7 2024-03-20 stsp 		/* This pipe is dead. Remove its event handler */
1177 ba97b2d7 2024-03-20 stsp 		event_del(&iev->ev);
1178 ba97b2d7 2024-03-20 stsp 
1179 ba97b2d7 2024-03-20 stsp 		/*
1180 ba97b2d7 2024-03-20 stsp 		 * Do not exit all of gotd if the notification handler dies.
1181 ba97b2d7 2024-03-20 stsp 		 * We can continue operating without notifications until an
1182 ba97b2d7 2024-03-20 stsp 		 * operator intervenes.
1183 ba97b2d7 2024-03-20 stsp 		 */
1184 ba97b2d7 2024-03-20 stsp 		log_warnx("notify child process (pid %d) closed its imsg pipe "
1185 ba97b2d7 2024-03-20 stsp 		    "unexpectedly", proc->pid);
1186 ba97b2d7 2024-03-20 stsp 		proc_done(proc);
1187 ba97b2d7 2024-03-20 stsp 	}
1188 ba97b2d7 2024-03-20 stsp }
1189 ba97b2d7 2024-03-20 stsp 
1190 ba97b2d7 2024-03-20 stsp static void
1191 5e25db14 2022-12-29 stsp gotd_dispatch_auth_child(int fd, short event, void *arg)
1192 5e25db14 2022-12-29 stsp {
1193 5e25db14 2022-12-29 stsp 	const struct got_error *err = NULL;
1194 5e25db14 2022-12-29 stsp 	struct gotd_imsgev *iev = arg;
1195 5e25db14 2022-12-29 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1196 5e25db14 2022-12-29 stsp 	struct gotd_client *client;
1197 5e25db14 2022-12-29 stsp 	struct gotd_repo *repo = NULL;
1198 5e25db14 2022-12-29 stsp 	ssize_t n;
1199 5e25db14 2022-12-29 stsp 	int shut = 0;
1200 5e25db14 2022-12-29 stsp 	struct imsg imsg;
1201 5e25db14 2022-12-29 stsp 	uint32_t client_id = 0;
1202 5e25db14 2022-12-29 stsp 	int do_disconnect = 0;
1203 56624d2b 2023-12-27 stsp 	size_t datalen;
1204 5e25db14 2022-12-29 stsp 
1205 5e25db14 2022-12-29 stsp 	client = find_client_by_proc_fd(fd);
1206 ae0cca99 2023-02-09 stsp 	if (client == NULL) {
1207 ae0cca99 2023-02-09 stsp 		/* Can happen during process teardown. */
1208 ae0cca99 2023-02-09 stsp 		warnx("cannot find client for fd %d", fd);
1209 ae0cca99 2023-02-09 stsp 		shut = 1;
1210 ae0cca99 2023-02-09 stsp 		goto done;
1211 ae0cca99 2023-02-09 stsp 	}
1212 5e25db14 2022-12-29 stsp 
1213 5e25db14 2022-12-29 stsp 	if (client->auth == NULL)
1214 5e25db14 2022-12-29 stsp 		fatalx("cannot find auth child process for fd %d", fd);
1215 5e25db14 2022-12-29 stsp 
1216 5e25db14 2022-12-29 stsp 	if (event & EV_READ) {
1217 5e25db14 2022-12-29 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1218 5e25db14 2022-12-29 stsp 			fatal("imsg_read error");
1219 5e25db14 2022-12-29 stsp 		if (n == 0) {
1220 5e25db14 2022-12-29 stsp 			/* Connection closed. */
1221 5e25db14 2022-12-29 stsp 			shut = 1;
1222 5e25db14 2022-12-29 stsp 			goto done;
1223 5e25db14 2022-12-29 stsp 		}
1224 5e25db14 2022-12-29 stsp 	}
1225 5e25db14 2022-12-29 stsp 
1226 5e25db14 2022-12-29 stsp 	if (event & EV_WRITE) {
1227 5e25db14 2022-12-29 stsp 		n = msgbuf_write(&ibuf->w);
1228 5e25db14 2022-12-29 stsp 		if (n == -1 && errno != EAGAIN)
1229 5e25db14 2022-12-29 stsp 			fatal("msgbuf_write");
1230 5e25db14 2022-12-29 stsp 		if (n == 0) {
1231 5e25db14 2022-12-29 stsp 			/* Connection closed. */
1232 5e25db14 2022-12-29 stsp 			shut = 1;
1233 5e25db14 2022-12-29 stsp 		}
1234 5e25db14 2022-12-29 stsp 		goto done;
1235 5e25db14 2022-12-29 stsp 	}
1236 5e25db14 2022-12-29 stsp 
1237 5e25db14 2022-12-29 stsp 	if (client->auth->iev.ibuf.fd != fd)
1238 5e25db14 2022-12-29 stsp 		fatalx("%s: unexpected fd %d", __func__, fd);
1239 5e25db14 2022-12-29 stsp 
1240 5e25db14 2022-12-29 stsp 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1241 5e25db14 2022-12-29 stsp 		fatal("%s: imsg_get error", __func__);
1242 5e25db14 2022-12-29 stsp 	if (n == 0)	/* No more messages. */
1243 5e25db14 2022-12-29 stsp 		return;
1244 5e25db14 2022-12-29 stsp 
1245 5e25db14 2022-12-29 stsp 	evtimer_del(&client->tmo);
1246 5e25db14 2022-12-29 stsp 
1247 56624d2b 2023-12-27 stsp 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1248 56624d2b 2023-12-27 stsp 
1249 5e25db14 2022-12-29 stsp 	switch (imsg.hdr.type) {
1250 5e25db14 2022-12-29 stsp 	case GOTD_IMSG_ERROR:
1251 5e25db14 2022-12-29 stsp 		do_disconnect = 1;
1252 5e25db14 2022-12-29 stsp 		err = gotd_imsg_recv_error(&client_id, &imsg);
1253 5e25db14 2022-12-29 stsp 		break;
1254 5e25db14 2022-12-29 stsp 	case GOTD_IMSG_ACCESS_GRANTED:
1255 56624d2b 2023-12-27 stsp 		if (client->state != GOTD_CLIENT_STATE_NEW) {
1256 56624d2b 2023-12-27 stsp 			do_disconnect = 1;
1257 56624d2b 2023-12-27 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1258 56624d2b 2023-12-27 stsp 		}
1259 5e25db14 2022-12-29 stsp 		break;
1260 5e25db14 2022-12-29 stsp 	default:
1261 5e25db14 2022-12-29 stsp 		do_disconnect = 1;
1262 5e25db14 2022-12-29 stsp 		log_debug("unexpected imsg %d", imsg.hdr.type);
1263 5e25db14 2022-12-29 stsp 		break;
1264 5e25db14 2022-12-29 stsp 	}
1265 5e25db14 2022-12-29 stsp 
1266 5e25db14 2022-12-29 stsp 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1267 5e25db14 2022-12-29 stsp 		do_disconnect = 1;
1268 5e25db14 2022-12-29 stsp 		log_debug("dropping imsg type %d from PID %d",
1269 5e25db14 2022-12-29 stsp 		    imsg.hdr.type, client->auth->pid);
1270 5e25db14 2022-12-29 stsp 	}
1271 5e25db14 2022-12-29 stsp 
1272 5e25db14 2022-12-29 stsp 	if (do_disconnect) {
1273 5e25db14 2022-12-29 stsp 		if (err)
1274 5e25db14 2022-12-29 stsp 			disconnect_on_error(client, err);
1275 5e25db14 2022-12-29 stsp 		else
1276 5e25db14 2022-12-29 stsp 			disconnect(client);
1277 56624d2b 2023-12-27 stsp 		imsg_free(&imsg);
1278 c000aa35 2023-05-01 mark 		return;
1279 56624d2b 2023-12-27 stsp 	}
1280 56624d2b 2023-12-27 stsp 
1281 56624d2b 2023-12-27 stsp 	client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1282 56624d2b 2023-12-27 stsp 	if (datalen > 0)
1283 56624d2b 2023-12-27 stsp 		client->username = strndup(imsg.data, datalen);
1284 56624d2b 2023-12-27 stsp 	imsg_free(&imsg);
1285 56624d2b 2023-12-27 stsp 	if (client->username == NULL &&
1286 56624d2b 2023-12-27 stsp 	    asprintf(&client->username, "uid %d", client->euid) == -1) {
1287 56624d2b 2023-12-27 stsp 		err = got_error_from_errno("asprintf");
1288 56624d2b 2023-12-27 stsp 		goto done;
1289 5e25db14 2022-12-29 stsp 	}
1290 5e25db14 2022-12-29 stsp 
1291 ba97b2d7 2024-03-20 stsp 	repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd.repos);
1292 5e25db14 2022-12-29 stsp 	if (repo == NULL) {
1293 5e25db14 2022-12-29 stsp 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1294 5e25db14 2022-12-29 stsp 		goto done;
1295 5e25db14 2022-12-29 stsp 	}
1296 5e25db14 2022-12-29 stsp 	kill_auth_proc(client);
1297 5e25db14 2022-12-29 stsp 
1298 56624d2b 2023-12-27 stsp 	log_info("authenticated %s for repository %s",
1299 56624d2b 2023-12-27 stsp 	    client->username, repo->name);
1300 5e25db14 2022-12-29 stsp 
1301 ae7c1b78 2023-01-10 stsp 	err = start_session_child(client, repo, gotd.argv0,
1302 7fdc3e58 2022-12-30 mark 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
1303 ae7c1b78 2023-01-10 stsp 	if (err)
1304 ae7c1b78 2023-01-10 stsp 		goto done;
1305 5e25db14 2022-12-29 stsp done:
1306 5e25db14 2022-12-29 stsp 	if (err)
1307 5e25db14 2022-12-29 stsp 		log_warnx("uid %d: %s", client->euid, err->msg);
1308 5e25db14 2022-12-29 stsp 
1309 5e25db14 2022-12-29 stsp 	/* We might have killed the auth process by now. */
1310 5e25db14 2022-12-29 stsp 	if (client->auth != NULL) {
1311 5e25db14 2022-12-29 stsp 		if (!shut) {
1312 5e25db14 2022-12-29 stsp 			gotd_imsg_event_add(iev);
1313 5e25db14 2022-12-29 stsp 		} else {
1314 5e25db14 2022-12-29 stsp 			/* This pipe is dead. Remove its event handler */
1315 5e25db14 2022-12-29 stsp 			event_del(&iev->ev);
1316 5e25db14 2022-12-29 stsp 		}
1317 5e25db14 2022-12-29 stsp 	}
1318 5e25db14 2022-12-29 stsp }
1319 5e25db14 2022-12-29 stsp 
1320 ae7c1b78 2023-01-10 stsp static const struct got_error *
1321 ae7c1b78 2023-01-10 stsp connect_session(struct gotd_client *client)
1322 ae7c1b78 2023-01-10 stsp {
1323 ae7c1b78 2023-01-10 stsp 	const struct got_error *err = NULL;
1324 ae7c1b78 2023-01-10 stsp 	struct gotd_imsg_connect iconnect;
1325 ae7c1b78 2023-01-10 stsp 	int s;
1326 ba97b2d7 2024-03-20 stsp 	struct ibuf *wbuf;
1327 ae7c1b78 2023-01-10 stsp 
1328 ae7c1b78 2023-01-10 stsp 	memset(&iconnect, 0, sizeof(iconnect));
1329 ae7c1b78 2023-01-10 stsp 
1330 ae7c1b78 2023-01-10 stsp 	s = dup(client->fd);
1331 ae7c1b78 2023-01-10 stsp 	if (s == -1)
1332 ae7c1b78 2023-01-10 stsp 		return got_error_from_errno("dup");
1333 ae7c1b78 2023-01-10 stsp 
1334 ae7c1b78 2023-01-10 stsp 	iconnect.client_id = client->id;
1335 ae7c1b78 2023-01-10 stsp 	iconnect.euid = client->euid;
1336 ae7c1b78 2023-01-10 stsp 	iconnect.egid = client->egid;
1337 ba97b2d7 2024-03-20 stsp 	iconnect.username_len = strlen(client->username);
1338 ae7c1b78 2023-01-10 stsp 
1339 ba97b2d7 2024-03-20 stsp 	wbuf = imsg_create(&client->session->iev.ibuf, GOTD_IMSG_CONNECT,
1340 ba97b2d7 2024-03-20 stsp 	    PROC_GOTD, gotd.pid, sizeof(iconnect) + iconnect.username_len);
1341 ba97b2d7 2024-03-20 stsp 	if (wbuf == NULL) {
1342 ae7c1b78 2023-01-10 stsp 		err = got_error_from_errno("imsg compose CONNECT");
1343 ae7c1b78 2023-01-10 stsp 		close(s);
1344 ae7c1b78 2023-01-10 stsp 		return err;
1345 ba97b2d7 2024-03-20 stsp 	}
1346 ba97b2d7 2024-03-20 stsp 	if (imsg_add(wbuf, &iconnect, sizeof(iconnect)) == -1) {
1347 ba97b2d7 2024-03-20 stsp 		close(s);
1348 ba97b2d7 2024-03-20 stsp 		return got_error_from_errno("imsg_add CONNECT");
1349 ba97b2d7 2024-03-20 stsp 	}
1350 ba97b2d7 2024-03-20 stsp 	if (imsg_add(wbuf, client->username, iconnect.username_len) == -1) {
1351 ba97b2d7 2024-03-20 stsp 		close(s);
1352 ba97b2d7 2024-03-20 stsp 		return got_error_from_errno("imsg_add CONNECT");
1353 ae7c1b78 2023-01-10 stsp 	}
1354 ae7c1b78 2023-01-10 stsp 
1355 ba97b2d7 2024-03-20 stsp 	ibuf_fd_set(wbuf, s);
1356 ba97b2d7 2024-03-20 stsp 	imsg_close(&client->session->iev.ibuf, wbuf);
1357 ba97b2d7 2024-03-20 stsp 	gotd_imsg_event_add(&client->session->iev);
1358 ba97b2d7 2024-03-20 stsp 
1359 ae7c1b78 2023-01-10 stsp 	/*
1360 ae7c1b78 2023-01-10 stsp 	 * We are no longer interested in messages from this client.
1361 ae7c1b78 2023-01-10 stsp 	 * Further client requests will be handled by the session process.
1362 ae7c1b78 2023-01-10 stsp 	 */
1363 ae7c1b78 2023-01-10 stsp 	msgbuf_clear(&client->iev.ibuf.w);
1364 ae7c1b78 2023-01-10 stsp 	imsg_clear(&client->iev.ibuf);
1365 ae7c1b78 2023-01-10 stsp 	event_del(&client->iev.ev);
1366 ae7c1b78 2023-01-10 stsp 	client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1367 ae7c1b78 2023-01-10 stsp 
1368 ae7c1b78 2023-01-10 stsp 	return NULL;
1369 ae7c1b78 2023-01-10 stsp }
1370 ae7c1b78 2023-01-10 stsp 
1371 5e25db14 2022-12-29 stsp static void
1372 ae7c1b78 2023-01-10 stsp gotd_dispatch_client_session(int fd, short event, void *arg)
1373 b50a2b46 2022-12-29 stsp {
1374 b50a2b46 2022-12-29 stsp 	struct gotd_imsgev *iev = arg;
1375 b50a2b46 2022-12-29 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1376 13b2bc37 2022-10-23 stsp 	struct gotd_child_proc *proc = NULL;
1377 b50a2b46 2022-12-29 stsp 	struct gotd_client *client = NULL;
1378 13b2bc37 2022-10-23 stsp 	ssize_t n;
1379 13b2bc37 2022-10-23 stsp 	int shut = 0;
1380 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
1381 13b2bc37 2022-10-23 stsp 
1382 ae7c1b78 2023-01-10 stsp 	client = find_client_by_proc_fd(fd);
1383 ae0cca99 2023-02-09 stsp 	if (client == NULL) {
1384 ae0cca99 2023-02-09 stsp 		/* Can happen during process teardown. */
1385 ae0cca99 2023-02-09 stsp 		warnx("cannot find client for fd %d", fd);
1386 ae0cca99 2023-02-09 stsp 		shut = 1;
1387 ae0cca99 2023-02-09 stsp 		goto done;
1388 ae0cca99 2023-02-09 stsp 	}
1389 ae7c1b78 2023-01-10 stsp 
1390 13b2bc37 2022-10-23 stsp 	if (event & EV_READ) {
1391 13b2bc37 2022-10-23 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1392 13b2bc37 2022-10-23 stsp 			fatal("imsg_read error");
1393 13b2bc37 2022-10-23 stsp 		if (n == 0) {
1394 13b2bc37 2022-10-23 stsp 			/* Connection closed. */
1395 13b2bc37 2022-10-23 stsp 			shut = 1;
1396 13b2bc37 2022-10-23 stsp 			goto done;
1397 13b2bc37 2022-10-23 stsp 		}
1398 13b2bc37 2022-10-23 stsp 	}
1399 13b2bc37 2022-10-23 stsp 
1400 13b2bc37 2022-10-23 stsp 	if (event & EV_WRITE) {
1401 13b2bc37 2022-10-23 stsp 		n = msgbuf_write(&ibuf->w);
1402 13b2bc37 2022-10-23 stsp 		if (n == -1 && errno != EAGAIN)
1403 13b2bc37 2022-10-23 stsp 			fatal("msgbuf_write");
1404 13b2bc37 2022-10-23 stsp 		if (n == 0) {
1405 13b2bc37 2022-10-23 stsp 			/* Connection closed. */
1406 13b2bc37 2022-10-23 stsp 			shut = 1;
1407 13b2bc37 2022-10-23 stsp 			goto done;
1408 ae7c1b78 2023-01-10 stsp 		}
1409 ae7c1b78 2023-01-10 stsp 	}
1410 ae7c1b78 2023-01-10 stsp 
1411 ae7c1b78 2023-01-10 stsp 	proc = client->session;
1412 ae7c1b78 2023-01-10 stsp 	if (proc == NULL)
1413 ae7c1b78 2023-01-10 stsp 		fatalx("cannot find session child process for fd %d", fd);
1414 ae7c1b78 2023-01-10 stsp 
1415 ae7c1b78 2023-01-10 stsp 	for (;;) {
1416 ae7c1b78 2023-01-10 stsp 		const struct got_error *err = NULL;
1417 ae7c1b78 2023-01-10 stsp 		uint32_t client_id = 0;
1418 ae7c1b78 2023-01-10 stsp 		int do_disconnect = 0, do_start_repo_child = 0;
1419 ae7c1b78 2023-01-10 stsp 
1420 ae7c1b78 2023-01-10 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1421 ae7c1b78 2023-01-10 stsp 			fatal("%s: imsg_get error", __func__);
1422 ae7c1b78 2023-01-10 stsp 		if (n == 0)	/* No more messages. */
1423 ae7c1b78 2023-01-10 stsp 			break;
1424 ae7c1b78 2023-01-10 stsp 
1425 ae7c1b78 2023-01-10 stsp 		switch (imsg.hdr.type) {
1426 ae7c1b78 2023-01-10 stsp 		case GOTD_IMSG_ERROR:
1427 ae7c1b78 2023-01-10 stsp 			do_disconnect = 1;
1428 ae7c1b78 2023-01-10 stsp 			err = gotd_imsg_recv_error(&client_id, &imsg);
1429 ae7c1b78 2023-01-10 stsp 			break;
1430 ae7c1b78 2023-01-10 stsp 		case GOTD_IMSG_CLIENT_SESSION_READY:
1431 eac23c30 2023-01-10 stsp 			if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1432 ae7c1b78 2023-01-10 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1433 ae7c1b78 2023-01-10 stsp 				break;
1434 ae7c1b78 2023-01-10 stsp 			}
1435 ae7c1b78 2023-01-10 stsp 			do_start_repo_child = 1;
1436 ae7c1b78 2023-01-10 stsp 			break;
1437 ae7c1b78 2023-01-10 stsp 		case GOTD_IMSG_DISCONNECT:
1438 ae7c1b78 2023-01-10 stsp 			do_disconnect = 1;
1439 ae7c1b78 2023-01-10 stsp 			break;
1440 ae7c1b78 2023-01-10 stsp 		default:
1441 ae7c1b78 2023-01-10 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1442 ae7c1b78 2023-01-10 stsp 			break;
1443 13b2bc37 2022-10-23 stsp 		}
1444 ae7c1b78 2023-01-10 stsp 
1445 ae7c1b78 2023-01-10 stsp 		if (!verify_imsg_src(client, proc, &imsg)) {
1446 ae7c1b78 2023-01-10 stsp 			log_debug("dropping imsg type %d from PID %d",
1447 ae7c1b78 2023-01-10 stsp 			    imsg.hdr.type, proc->pid);
1448 ae7c1b78 2023-01-10 stsp 			imsg_free(&imsg);
1449 ae7c1b78 2023-01-10 stsp 			continue;
1450 ae7c1b78 2023-01-10 stsp 		}
1451 ae7c1b78 2023-01-10 stsp 		if (err)
1452 ae7c1b78 2023-01-10 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
1453 ae7c1b78 2023-01-10 stsp 
1454 ae7c1b78 2023-01-10 stsp 		if (do_start_repo_child) {
1455 ae7c1b78 2023-01-10 stsp 			struct gotd_repo *repo;
1456 b09c1279 2023-03-28 stsp 			const char *name = client->session->repo_name;
1457 ae7c1b78 2023-01-10 stsp 
1458 ba97b2d7 2024-03-20 stsp 			repo = gotd_find_repo_by_name(name, &gotd.repos);
1459 ae7c1b78 2023-01-10 stsp 			if (repo != NULL) {
1460 ae7c1b78 2023-01-10 stsp 				enum gotd_procid proc_type;
1461 ae7c1b78 2023-01-10 stsp 
1462 ae7c1b78 2023-01-10 stsp 				if (client->required_auth & GOTD_AUTH_WRITE)
1463 ae7c1b78 2023-01-10 stsp 					proc_type = PROC_REPO_WRITE;
1464 ae7c1b78 2023-01-10 stsp 				else
1465 ae7c1b78 2023-01-10 stsp 					proc_type = PROC_REPO_READ;
1466 ae7c1b78 2023-01-10 stsp 
1467 ae7c1b78 2023-01-10 stsp 				err = start_repo_child(client, proc_type, repo,
1468 ae7c1b78 2023-01-10 stsp 				    gotd.argv0, gotd.confpath, gotd.daemonize,
1469 ae7c1b78 2023-01-10 stsp 				    gotd.verbosity);
1470 ae7c1b78 2023-01-10 stsp 			} else
1471 ae7c1b78 2023-01-10 stsp 				err = got_error(GOT_ERR_NOT_GIT_REPO);
1472 ae7c1b78 2023-01-10 stsp 
1473 ae7c1b78 2023-01-10 stsp 			if (err) {
1474 ae7c1b78 2023-01-10 stsp 				log_warnx("uid %d: %s", client->euid, err->msg);
1475 ae7c1b78 2023-01-10 stsp 				do_disconnect = 1;
1476 ae7c1b78 2023-01-10 stsp 			}
1477 ae7c1b78 2023-01-10 stsp 		}
1478 ae7c1b78 2023-01-10 stsp 
1479 ae7c1b78 2023-01-10 stsp 		if (do_disconnect) {
1480 ae7c1b78 2023-01-10 stsp 			if (err)
1481 ae7c1b78 2023-01-10 stsp 				disconnect_on_error(client, err);
1482 ae7c1b78 2023-01-10 stsp 			else
1483 ae7c1b78 2023-01-10 stsp 				disconnect(client);
1484 ae7c1b78 2023-01-10 stsp 		}
1485 ae7c1b78 2023-01-10 stsp 
1486 ae7c1b78 2023-01-10 stsp 		imsg_free(&imsg);
1487 13b2bc37 2022-10-23 stsp 	}
1488 ae7c1b78 2023-01-10 stsp done:
1489 ae7c1b78 2023-01-10 stsp 	if (!shut) {
1490 ae7c1b78 2023-01-10 stsp 		gotd_imsg_event_add(iev);
1491 ae7c1b78 2023-01-10 stsp 	} else {
1492 ae7c1b78 2023-01-10 stsp 		/* This pipe is dead. Remove its event handler */
1493 ae7c1b78 2023-01-10 stsp 		event_del(&iev->ev);
1494 ae7c1b78 2023-01-10 stsp 		disconnect(client);
1495 ba97b2d7 2024-03-20 stsp 	}
1496 ba97b2d7 2024-03-20 stsp }
1497 ba97b2d7 2024-03-20 stsp 
1498 ba97b2d7 2024-03-20 stsp static const struct got_error *
1499 ba97b2d7 2024-03-20 stsp connect_notifier_and_session(struct gotd_client *client)
1500 ba97b2d7 2024-03-20 stsp {
1501 ba97b2d7 2024-03-20 stsp 	const struct got_error *err = NULL;
1502 ba97b2d7 2024-03-20 stsp 	struct gotd_imsgev *session_iev = &client->session->iev;
1503 ba97b2d7 2024-03-20 stsp 	int pipe[2];
1504 ba97b2d7 2024-03-20 stsp 
1505 ba97b2d7 2024-03-20 stsp 	if (gotd.notify_proc == NULL)
1506 ba97b2d7 2024-03-20 stsp 		return NULL;
1507 ba97b2d7 2024-03-20 stsp 
1508 ba97b2d7 2024-03-20 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1509 ba97b2d7 2024-03-20 stsp 	    PF_UNSPEC, pipe) == -1)
1510 ba97b2d7 2024-03-20 stsp 		return got_error_from_errno("socketpair");
1511 ba97b2d7 2024-03-20 stsp 
1512 ba97b2d7 2024-03-20 stsp 	/* Pass notifier pipe to session . */
1513 ba97b2d7 2024-03-20 stsp 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_NOTIFIER,
1514 ba97b2d7 2024-03-20 stsp 	    PROC_GOTD, pipe[0], NULL, 0) == -1) {
1515 ba97b2d7 2024-03-20 stsp 		err = got_error_from_errno("imsg compose CONNECT_NOTIFIER");
1516 ba97b2d7 2024-03-20 stsp 		close(pipe[0]);
1517 ba97b2d7 2024-03-20 stsp 		close(pipe[1]);
1518 ba97b2d7 2024-03-20 stsp 		return err;
1519 ba97b2d7 2024-03-20 stsp 	}
1520 ba97b2d7 2024-03-20 stsp 
1521 ba97b2d7 2024-03-20 stsp 	/* Pass session pipe to notifier. */
1522 ba97b2d7 2024-03-20 stsp 	if (gotd_imsg_compose_event(&gotd.notify_proc->iev,
1523 ba97b2d7 2024-03-20 stsp 	    GOTD_IMSG_CONNECT_SESSION, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1524 ba97b2d7 2024-03-20 stsp 		err = got_error_from_errno("imsg compose CONNECT_SESSION");
1525 ba97b2d7 2024-03-20 stsp 		close(pipe[1]);
1526 ba97b2d7 2024-03-20 stsp 		return err;
1527 ae7c1b78 2023-01-10 stsp 	}
1528 ba97b2d7 2024-03-20 stsp 
1529 ba97b2d7 2024-03-20 stsp 	return NULL;
1530 ae7c1b78 2023-01-10 stsp }
1531 13b2bc37 2022-10-23 stsp 
1532 ae7c1b78 2023-01-10 stsp static void
1533 ae7c1b78 2023-01-10 stsp gotd_dispatch_repo_child(int fd, short event, void *arg)
1534 ae7c1b78 2023-01-10 stsp {
1535 ae7c1b78 2023-01-10 stsp 	struct gotd_imsgev *iev = arg;
1536 ae7c1b78 2023-01-10 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1537 ae7c1b78 2023-01-10 stsp 	struct gotd_child_proc *proc = NULL;
1538 ae7c1b78 2023-01-10 stsp 	struct gotd_client *client;
1539 ae7c1b78 2023-01-10 stsp 	ssize_t n;
1540 ae7c1b78 2023-01-10 stsp 	int shut = 0;
1541 ae7c1b78 2023-01-10 stsp 	struct imsg imsg;
1542 ae7c1b78 2023-01-10 stsp 
1543 b50a2b46 2022-12-29 stsp 	client = find_client_by_proc_fd(fd);
1544 ae0cca99 2023-02-09 stsp 	if (client == NULL) {
1545 ae0cca99 2023-02-09 stsp 		/* Can happen during process teardown. */
1546 ae0cca99 2023-02-09 stsp 		warnx("cannot find client for fd %d", fd);
1547 ae0cca99 2023-02-09 stsp 		shut = 1;
1548 ae0cca99 2023-02-09 stsp 		goto done;
1549 ae0cca99 2023-02-09 stsp 	}
1550 b50a2b46 2022-12-29 stsp 
1551 ae7c1b78 2023-01-10 stsp 	if (event & EV_READ) {
1552 ae7c1b78 2023-01-10 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1553 ae7c1b78 2023-01-10 stsp 			fatal("imsg_read error");
1554 ae7c1b78 2023-01-10 stsp 		if (n == 0) {
1555 ae7c1b78 2023-01-10 stsp 			/* Connection closed. */
1556 ae7c1b78 2023-01-10 stsp 			shut = 1;
1557 ae7c1b78 2023-01-10 stsp 			goto done;
1558 ae7c1b78 2023-01-10 stsp 		}
1559 ae7c1b78 2023-01-10 stsp 	}
1560 ae7c1b78 2023-01-10 stsp 
1561 ae7c1b78 2023-01-10 stsp 	if (event & EV_WRITE) {
1562 ae7c1b78 2023-01-10 stsp 		n = msgbuf_write(&ibuf->w);
1563 ae7c1b78 2023-01-10 stsp 		if (n == -1 && errno != EAGAIN)
1564 ae7c1b78 2023-01-10 stsp 			fatal("msgbuf_write");
1565 ae7c1b78 2023-01-10 stsp 		if (n == 0) {
1566 ae7c1b78 2023-01-10 stsp 			/* Connection closed. */
1567 ae7c1b78 2023-01-10 stsp 			shut = 1;
1568 ae7c1b78 2023-01-10 stsp 			goto done;
1569 ae7c1b78 2023-01-10 stsp 		}
1570 ae7c1b78 2023-01-10 stsp 	}
1571 ae7c1b78 2023-01-10 stsp 
1572 f7a854cf 2023-01-10 stsp 	proc = client->repo;
1573 13b2bc37 2022-10-23 stsp 	if (proc == NULL)
1574 13b2bc37 2022-10-23 stsp 		fatalx("cannot find child process for fd %d", fd);
1575 13b2bc37 2022-10-23 stsp 
1576 13b2bc37 2022-10-23 stsp 	for (;;) {
1577 13b2bc37 2022-10-23 stsp 		const struct got_error *err = NULL;
1578 13b2bc37 2022-10-23 stsp 		uint32_t client_id = 0;
1579 13b2bc37 2022-10-23 stsp 		int do_disconnect = 0;
1580 13b2bc37 2022-10-23 stsp 
1581 13b2bc37 2022-10-23 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1582 13b2bc37 2022-10-23 stsp 			fatal("%s: imsg_get error", __func__);
1583 13b2bc37 2022-10-23 stsp 		if (n == 0)	/* No more messages. */
1584 13b2bc37 2022-10-23 stsp 			break;
1585 13b2bc37 2022-10-23 stsp 
1586 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
1587 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
1588 13b2bc37 2022-10-23 stsp 			do_disconnect = 1;
1589 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(&client_id, &imsg);
1590 13b2bc37 2022-10-23 stsp 			break;
1591 b50a2b46 2022-12-29 stsp 		case GOTD_IMSG_REPO_CHILD_READY:
1592 ae7c1b78 2023-01-10 stsp 			err = connect_session(client);
1593 ae7c1b78 2023-01-10 stsp 			if (err)
1594 ae7c1b78 2023-01-10 stsp 				break;
1595 ba97b2d7 2024-03-20 stsp 			err = connect_notifier_and_session(client);
1596 ba97b2d7 2024-03-20 stsp 			if (err)
1597 ba97b2d7 2024-03-20 stsp 				break;
1598 ae7c1b78 2023-01-10 stsp 			err = connect_repo_child(client, proc);
1599 d93ecf7d 2022-12-14 stsp 			break;
1600 13b2bc37 2022-10-23 stsp 		default:
1601 13b2bc37 2022-10-23 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1602 13b2bc37 2022-10-23 stsp 			break;
1603 13b2bc37 2022-10-23 stsp 		}
1604 13b2bc37 2022-10-23 stsp 
1605 13b2bc37 2022-10-23 stsp 		if (!verify_imsg_src(client, proc, &imsg)) {
1606 13b2bc37 2022-10-23 stsp 			log_debug("dropping imsg type %d from PID %d",
1607 13b2bc37 2022-10-23 stsp 			    imsg.hdr.type, proc->pid);
1608 13b2bc37 2022-10-23 stsp 			imsg_free(&imsg);
1609 13b2bc37 2022-10-23 stsp 			continue;
1610 13b2bc37 2022-10-23 stsp 		}
1611 13b2bc37 2022-10-23 stsp 		if (err)
1612 13b2bc37 2022-10-23 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
1613 13b2bc37 2022-10-23 stsp 
1614 13b2bc37 2022-10-23 stsp 		if (do_disconnect) {
1615 13b2bc37 2022-10-23 stsp 			if (err)
1616 13b2bc37 2022-10-23 stsp 				disconnect_on_error(client, err);
1617 13b2bc37 2022-10-23 stsp 			else
1618 13b2bc37 2022-10-23 stsp 				disconnect(client);
1619 36c7cfbb 2022-11-04 stsp 		}
1620 ae7c1b78 2023-01-10 stsp 
1621 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
1622 13b2bc37 2022-10-23 stsp 	}
1623 13b2bc37 2022-10-23 stsp done:
1624 13b2bc37 2022-10-23 stsp 	if (!shut) {
1625 13b2bc37 2022-10-23 stsp 		gotd_imsg_event_add(iev);
1626 13b2bc37 2022-10-23 stsp 	} else {
1627 13b2bc37 2022-10-23 stsp 		/* This pipe is dead. Remove its event handler */
1628 13b2bc37 2022-10-23 stsp 		event_del(&iev->ev);
1629 ae7c1b78 2023-01-10 stsp 		disconnect(client);
1630 13b2bc37 2022-10-23 stsp 	}
1631 13b2bc37 2022-10-23 stsp }
1632 13b2bc37 2022-10-23 stsp 
1633 13b2bc37 2022-10-23 stsp static pid_t
1634 eec68231 2022-12-14 stsp start_child(enum gotd_procid proc_id, const char *repo_path,
1635 585362fd 2022-10-31 op     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1636 13b2bc37 2022-10-23 stsp {
1637 585362fd 2022-10-31 op 	char	*argv[11];
1638 13b2bc37 2022-10-23 stsp 	int	 argc = 0;
1639 13b2bc37 2022-10-23 stsp 	pid_t	 pid;
1640 13b2bc37 2022-10-23 stsp 
1641 13b2bc37 2022-10-23 stsp 	switch (pid = fork()) {
1642 13b2bc37 2022-10-23 stsp 	case -1:
1643 13b2bc37 2022-10-23 stsp 		fatal("cannot fork");
1644 13b2bc37 2022-10-23 stsp 	case 0:
1645 13b2bc37 2022-10-23 stsp 		break;
1646 13b2bc37 2022-10-23 stsp 	default:
1647 13b2bc37 2022-10-23 stsp 		close(fd);
1648 13b2bc37 2022-10-23 stsp 		return pid;
1649 13b2bc37 2022-10-23 stsp 	}
1650 13b2bc37 2022-10-23 stsp 
1651 8c6fc146 2022-11-17 stsp 	if (fd != GOTD_FILENO_MSG_PIPE) {
1652 8c6fc146 2022-11-17 stsp 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1653 13b2bc37 2022-10-23 stsp 			fatal("cannot setup imsg fd");
1654 13b2bc37 2022-10-23 stsp 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1655 13b2bc37 2022-10-23 stsp 		fatal("cannot setup imsg fd");
1656 13b2bc37 2022-10-23 stsp 
1657 13b2bc37 2022-10-23 stsp 	argv[argc++] = argv0;
1658 13b2bc37 2022-10-23 stsp 	switch (proc_id) {
1659 d93ecf7d 2022-12-14 stsp 	case PROC_LISTEN:
1660 d93ecf7d 2022-12-14 stsp 		argv[argc++] = (char *)"-L";
1661 d93ecf7d 2022-12-14 stsp 		break;
1662 5e25db14 2022-12-29 stsp 	case PROC_AUTH:
1663 5e25db14 2022-12-29 stsp 		argv[argc++] = (char *)"-A";
1664 5e25db14 2022-12-29 stsp 		break;
1665 b0614828 2023-06-19 stsp 	case PROC_SESSION_READ:
1666 b0614828 2023-06-19 stsp 		argv[argc++] = (char *)"-s";
1667 b0614828 2023-06-19 stsp 		break;
1668 b0614828 2023-06-19 stsp 	case PROC_SESSION_WRITE:
1669 ae7c1b78 2023-01-10 stsp 		argv[argc++] = (char *)"-S";
1670 ae7c1b78 2023-01-10 stsp 		break;
1671 13b2bc37 2022-10-23 stsp 	case PROC_REPO_READ:
1672 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-R";
1673 13b2bc37 2022-10-23 stsp 		break;
1674 13b2bc37 2022-10-23 stsp 	case PROC_REPO_WRITE:
1675 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-W";
1676 13b2bc37 2022-10-23 stsp 		break;
1677 ba97b2d7 2024-03-20 stsp 	case PROC_NOTIFY:
1678 ba97b2d7 2024-03-20 stsp 		argv[argc++] = (char *)"-N";
1679 ba97b2d7 2024-03-20 stsp 		break;
1680 13b2bc37 2022-10-23 stsp 	default:
1681 13b2bc37 2022-10-23 stsp 		fatalx("invalid process id %d", proc_id);
1682 13b2bc37 2022-10-23 stsp 	}
1683 13b2bc37 2022-10-23 stsp 
1684 585362fd 2022-10-31 op 	argv[argc++] = (char *)"-f";
1685 585362fd 2022-10-31 op 	argv[argc++] = (char *)confpath;
1686 585362fd 2022-10-31 op 
1687 eec68231 2022-12-14 stsp 	if (repo_path) {
1688 d93ecf7d 2022-12-14 stsp 		argv[argc++] = (char *)"-P";
1689 eec68231 2022-12-14 stsp 		argv[argc++] = (char *)repo_path;
1690 d93ecf7d 2022-12-14 stsp 	}
1691 13b2bc37 2022-10-23 stsp 
1692 13b2bc37 2022-10-23 stsp 	if (!daemonize)
1693 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-d";
1694 13b2bc37 2022-10-23 stsp 	if (verbosity > 0)
1695 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-v";
1696 13b2bc37 2022-10-23 stsp 	if (verbosity > 1)
1697 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-v";
1698 13b2bc37 2022-10-23 stsp 	argv[argc++] = NULL;
1699 13b2bc37 2022-10-23 stsp 
1700 13b2bc37 2022-10-23 stsp 	execvp(argv0, argv);
1701 13b2bc37 2022-10-23 stsp 	fatal("execvp");
1702 13b2bc37 2022-10-23 stsp }
1703 13b2bc37 2022-10-23 stsp 
1704 13b2bc37 2022-10-23 stsp static void
1705 d93ecf7d 2022-12-14 stsp start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1706 d93ecf7d 2022-12-14 stsp {
1707 c929736a 2023-06-22 op 	struct gotd_child_proc *proc;
1708 d93ecf7d 2022-12-14 stsp 
1709 c929736a 2023-06-22 op 	proc = calloc(1, sizeof(*proc));
1710 c929736a 2023-06-22 op 	if (proc == NULL)
1711 c929736a 2023-06-22 op 		fatal("calloc");
1712 c929736a 2023-06-22 op 
1713 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1714 839338f6 2023-06-22 op 
1715 839338f6 2023-06-22 op 	/* proc->tmo is initialized in main() after event_init() */
1716 839338f6 2023-06-22 op 
1717 d93ecf7d 2022-12-14 stsp 	proc->type = PROC_LISTEN;
1718 d93ecf7d 2022-12-14 stsp 
1719 d93ecf7d 2022-12-14 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1720 d93ecf7d 2022-12-14 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1721 d93ecf7d 2022-12-14 stsp 		fatal("socketpair");
1722 d93ecf7d 2022-12-14 stsp 
1723 d93ecf7d 2022-12-14 stsp 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1724 d93ecf7d 2022-12-14 stsp 	    proc->pipe[1], daemonize, verbosity);
1725 d93ecf7d 2022-12-14 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1726 b50a2b46 2022-12-29 stsp 	proc->iev.handler = gotd_dispatch_listener;
1727 d93ecf7d 2022-12-14 stsp 	proc->iev.events = EV_READ;
1728 d93ecf7d 2022-12-14 stsp 	proc->iev.handler_arg = NULL;
1729 c929736a 2023-06-22 op 
1730 c929736a 2023-06-22 op 	gotd.listen_proc = proc;
1731 ba97b2d7 2024-03-20 stsp }
1732 ba97b2d7 2024-03-20 stsp 
1733 ba97b2d7 2024-03-20 stsp static void
1734 ba97b2d7 2024-03-20 stsp start_notifier(char *argv0, const char *confpath, int daemonize, int verbosity)
1735 ba97b2d7 2024-03-20 stsp {
1736 ba97b2d7 2024-03-20 stsp 	struct gotd_child_proc *proc;
1737 ba97b2d7 2024-03-20 stsp 
1738 ba97b2d7 2024-03-20 stsp 	proc = calloc(1, sizeof(*proc));
1739 ba97b2d7 2024-03-20 stsp 	if (proc == NULL)
1740 ba97b2d7 2024-03-20 stsp 		fatal("calloc");
1741 ba97b2d7 2024-03-20 stsp 
1742 ba97b2d7 2024-03-20 stsp 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1743 ba97b2d7 2024-03-20 stsp 
1744 ba97b2d7 2024-03-20 stsp 	/* proc->tmo is initialized in main() after event_init() */
1745 ba97b2d7 2024-03-20 stsp 
1746 ba97b2d7 2024-03-20 stsp 	proc->type = PROC_NOTIFY;
1747 ba97b2d7 2024-03-20 stsp 
1748 ba97b2d7 2024-03-20 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1749 ba97b2d7 2024-03-20 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1750 ba97b2d7 2024-03-20 stsp 		fatal("socketpair");
1751 ba97b2d7 2024-03-20 stsp 
1752 ba97b2d7 2024-03-20 stsp 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1753 ba97b2d7 2024-03-20 stsp 	    proc->pipe[1], daemonize, verbosity);
1754 ba97b2d7 2024-03-20 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1755 ba97b2d7 2024-03-20 stsp 	proc->iev.handler = gotd_dispatch_notifier;
1756 ba97b2d7 2024-03-20 stsp 	proc->iev.events = EV_READ;
1757 ba97b2d7 2024-03-20 stsp 	proc->iev.handler_arg = NULL;
1758 ba97b2d7 2024-03-20 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1759 ba97b2d7 2024-03-20 stsp 	    gotd_dispatch_notifier, &proc->iev);
1760 ba97b2d7 2024-03-20 stsp 
1761 ba97b2d7 2024-03-20 stsp 	gotd.notify_proc = proc;
1762 d93ecf7d 2022-12-14 stsp }
1763 d93ecf7d 2022-12-14 stsp 
1764 b50a2b46 2022-12-29 stsp static const struct got_error *
1765 ae7c1b78 2023-01-10 stsp start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1766 ae7c1b78 2023-01-10 stsp     char *argv0, const char *confpath, int daemonize, int verbosity)
1767 ae7c1b78 2023-01-10 stsp {
1768 ae7c1b78 2023-01-10 stsp 	struct gotd_child_proc *proc;
1769 ae7c1b78 2023-01-10 stsp 
1770 ae7c1b78 2023-01-10 stsp 	proc = calloc(1, sizeof(*proc));
1771 ae7c1b78 2023-01-10 stsp 	if (proc == NULL)
1772 ae7c1b78 2023-01-10 stsp 		return got_error_from_errno("calloc");
1773 ae7c1b78 2023-01-10 stsp 
1774 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1775 839338f6 2023-06-22 op 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1776 839338f6 2023-06-22 op 
1777 b0614828 2023-06-19 stsp 	if (client_is_reading(client))
1778 b0614828 2023-06-19 stsp 		proc->type = PROC_SESSION_READ;
1779 b0614828 2023-06-19 stsp 	else
1780 b0614828 2023-06-19 stsp 		proc->type = PROC_SESSION_WRITE;
1781 ae7c1b78 2023-01-10 stsp 	if (strlcpy(proc->repo_name, repo->name,
1782 ae7c1b78 2023-01-10 stsp 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1783 ae7c1b78 2023-01-10 stsp 		fatalx("repository name too long: %s", repo->name);
1784 ae7c1b78 2023-01-10 stsp 	log_debug("starting client uid %d session for repository %s",
1785 ae7c1b78 2023-01-10 stsp 	    client->euid, repo->name);
1786 ae7c1b78 2023-01-10 stsp 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1787 ae7c1b78 2023-01-10 stsp 	    sizeof(proc->repo_path))
1788 ae7c1b78 2023-01-10 stsp 		fatalx("repository path too long: %s", repo->path);
1789 ae7c1b78 2023-01-10 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1790 ae7c1b78 2023-01-10 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1791 ae7c1b78 2023-01-10 stsp 		fatal("socketpair");
1792 ae7c1b78 2023-01-10 stsp 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1793 ae7c1b78 2023-01-10 stsp 	    confpath, proc->pipe[1], daemonize, verbosity);
1794 ae7c1b78 2023-01-10 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1795 ae7c1b78 2023-01-10 stsp 	log_debug("proc %s %s is on fd %d",
1796 ae7c1b78 2023-01-10 stsp 	    gotd_proc_names[proc->type], proc->repo_path,
1797 ae7c1b78 2023-01-10 stsp 	    proc->pipe[0]);
1798 ae7c1b78 2023-01-10 stsp 	proc->iev.handler = gotd_dispatch_client_session;
1799 ae7c1b78 2023-01-10 stsp 	proc->iev.events = EV_READ;
1800 ae7c1b78 2023-01-10 stsp 	proc->iev.handler_arg = NULL;
1801 ae7c1b78 2023-01-10 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1802 ae7c1b78 2023-01-10 stsp 	    gotd_dispatch_client_session, &proc->iev);
1803 ae7c1b78 2023-01-10 stsp 	gotd_imsg_event_add(&proc->iev);
1804 ae7c1b78 2023-01-10 stsp 
1805 ae7c1b78 2023-01-10 stsp 	client->session = proc;
1806 ae7c1b78 2023-01-10 stsp 	return NULL;
1807 ae7c1b78 2023-01-10 stsp }
1808 ae7c1b78 2023-01-10 stsp 
1809 ae7c1b78 2023-01-10 stsp static const struct got_error *
1810 b50a2b46 2022-12-29 stsp start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1811 b50a2b46 2022-12-29 stsp     struct gotd_repo *repo, char *argv0, const char *confpath,
1812 585362fd 2022-10-31 op     int daemonize, int verbosity)
1813 13b2bc37 2022-10-23 stsp {
1814 13b2bc37 2022-10-23 stsp 	struct gotd_child_proc *proc;
1815 13b2bc37 2022-10-23 stsp 
1816 b50a2b46 2022-12-29 stsp 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1817 b50a2b46 2022-12-29 stsp 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1818 7fdc3e58 2022-12-30 mark 
1819 b50a2b46 2022-12-29 stsp 	proc = calloc(1, sizeof(*proc));
1820 b50a2b46 2022-12-29 stsp 	if (proc == NULL)
1821 b50a2b46 2022-12-29 stsp 		return got_error_from_errno("calloc");
1822 13b2bc37 2022-10-23 stsp 
1823 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1824 839338f6 2023-06-22 op 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1825 839338f6 2023-06-22 op 
1826 b50a2b46 2022-12-29 stsp 	proc->type = proc_type;
1827 b50a2b46 2022-12-29 stsp 	if (strlcpy(proc->repo_name, repo->name,
1828 b50a2b46 2022-12-29 stsp 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1829 b50a2b46 2022-12-29 stsp 		fatalx("repository name too long: %s", repo->name);
1830 b50a2b46 2022-12-29 stsp 	log_debug("starting %s for repository %s",
1831 b50a2b46 2022-12-29 stsp 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1832 9b7f22a6 2023-01-08 stsp 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1833 9b7f22a6 2023-01-08 stsp 	    sizeof(proc->repo_path))
1834 9b7f22a6 2023-01-08 stsp 		fatalx("repository path too long: %s", repo->path);
1835 b50a2b46 2022-12-29 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1836 b50a2b46 2022-12-29 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1837 b50a2b46 2022-12-29 stsp 		fatal("socketpair");
1838 b50a2b46 2022-12-29 stsp 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1839 b50a2b46 2022-12-29 stsp 	    confpath, proc->pipe[1], daemonize, verbosity);
1840 b50a2b46 2022-12-29 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1841 b50a2b46 2022-12-29 stsp 	log_debug("proc %s %s is on fd %d",
1842 b50a2b46 2022-12-29 stsp 	    gotd_proc_names[proc->type], proc->repo_path,
1843 b50a2b46 2022-12-29 stsp 	    proc->pipe[0]);
1844 b50a2b46 2022-12-29 stsp 	proc->iev.handler = gotd_dispatch_repo_child;
1845 b50a2b46 2022-12-29 stsp 	proc->iev.events = EV_READ;
1846 b50a2b46 2022-12-29 stsp 	proc->iev.handler_arg = NULL;
1847 b50a2b46 2022-12-29 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1848 b50a2b46 2022-12-29 stsp 	    gotd_dispatch_repo_child, &proc->iev);
1849 b50a2b46 2022-12-29 stsp 	gotd_imsg_event_add(&proc->iev);
1850 b50a2b46 2022-12-29 stsp 
1851 f7a854cf 2023-01-10 stsp 	client->repo = proc;
1852 5e25db14 2022-12-29 stsp 	return NULL;
1853 5e25db14 2022-12-29 stsp }
1854 5e25db14 2022-12-29 stsp 
1855 5e25db14 2022-12-29 stsp static const struct got_error *
1856 5e25db14 2022-12-29 stsp start_auth_child(struct gotd_client *client, int required_auth,
1857 5e25db14 2022-12-29 stsp     struct gotd_repo *repo, char *argv0, const char *confpath,
1858 5e25db14 2022-12-29 stsp     int daemonize, int verbosity)
1859 5e25db14 2022-12-29 stsp {
1860 365cf0f3 2022-12-29 stsp 	const struct got_error *err = NULL;
1861 5e25db14 2022-12-29 stsp 	struct gotd_child_proc *proc;
1862 5e25db14 2022-12-29 stsp 	struct gotd_imsg_auth iauth;
1863 365cf0f3 2022-12-29 stsp 	int fd;
1864 5e25db14 2022-12-29 stsp 
1865 5e25db14 2022-12-29 stsp 	memset(&iauth, 0, sizeof(iauth));
1866 365cf0f3 2022-12-29 stsp 
1867 365cf0f3 2022-12-29 stsp 	fd = dup(client->fd);
1868 365cf0f3 2022-12-29 stsp 	if (fd == -1)
1869 365cf0f3 2022-12-29 stsp 		return got_error_from_errno("dup");
1870 5e25db14 2022-12-29 stsp 
1871 5e25db14 2022-12-29 stsp 	proc = calloc(1, sizeof(*proc));
1872 365cf0f3 2022-12-29 stsp 	if (proc == NULL) {
1873 365cf0f3 2022-12-29 stsp 		err = got_error_from_errno("calloc");
1874 365cf0f3 2022-12-29 stsp 		close(fd);
1875 365cf0f3 2022-12-29 stsp 		return err;
1876 365cf0f3 2022-12-29 stsp 	}
1877 839338f6 2023-06-22 op 
1878 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1879 839338f6 2023-06-22 op 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1880 5e25db14 2022-12-29 stsp 
1881 5e25db14 2022-12-29 stsp 	proc->type = PROC_AUTH;
1882 5e25db14 2022-12-29 stsp 	if (strlcpy(proc->repo_name, repo->name,
1883 5e25db14 2022-12-29 stsp 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1884 5e25db14 2022-12-29 stsp 		fatalx("repository name too long: %s", repo->name);
1885 5e25db14 2022-12-29 stsp 	log_debug("starting auth for uid %d repository %s",
1886 5e25db14 2022-12-29 stsp 	    client->euid, repo->name);
1887 9b7f22a6 2023-01-08 stsp 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1888 9b7f22a6 2023-01-08 stsp 	    sizeof(proc->repo_path))
1889 9b7f22a6 2023-01-08 stsp 		fatalx("repository path too long: %s", repo->path);
1890 5e25db14 2022-12-29 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1891 5e25db14 2022-12-29 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1892 5e25db14 2022-12-29 stsp 		fatal("socketpair");
1893 5e25db14 2022-12-29 stsp 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1894 5e25db14 2022-12-29 stsp 	    confpath, proc->pipe[1], daemonize, verbosity);
1895 5e25db14 2022-12-29 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1896 5e25db14 2022-12-29 stsp 	log_debug("proc %s %s is on fd %d",
1897 5e25db14 2022-12-29 stsp 	    gotd_proc_names[proc->type], proc->repo_path,
1898 5e25db14 2022-12-29 stsp 	    proc->pipe[0]);
1899 5e25db14 2022-12-29 stsp 	proc->iev.handler = gotd_dispatch_auth_child;
1900 5e25db14 2022-12-29 stsp 	proc->iev.events = EV_READ;
1901 5e25db14 2022-12-29 stsp 	proc->iev.handler_arg = NULL;
1902 5e25db14 2022-12-29 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1903 5e25db14 2022-12-29 stsp 	    gotd_dispatch_auth_child, &proc->iev);
1904 5e25db14 2022-12-29 stsp 	gotd_imsg_event_add(&proc->iev);
1905 5e25db14 2022-12-29 stsp 
1906 5e25db14 2022-12-29 stsp 	iauth.euid = client->euid;
1907 5e25db14 2022-12-29 stsp 	iauth.egid = client->egid;
1908 5e25db14 2022-12-29 stsp 	iauth.required_auth = required_auth;
1909 5e25db14 2022-12-29 stsp 	iauth.client_id = client->id;
1910 5e25db14 2022-12-29 stsp 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1911 365cf0f3 2022-12-29 stsp 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1912 5e25db14 2022-12-29 stsp 		log_warn("imsg compose AUTHENTICATE");
1913 365cf0f3 2022-12-29 stsp 		close(fd);
1914 365cf0f3 2022-12-29 stsp 		/* Let the auth_timeout handler tidy up. */
1915 365cf0f3 2022-12-29 stsp 	}
1916 b50a2b46 2022-12-29 stsp 
1917 5e25db14 2022-12-29 stsp 	client->auth = proc;
1918 5e25db14 2022-12-29 stsp 	client->required_auth = required_auth;
1919 b50a2b46 2022-12-29 stsp 	return NULL;
1920 eec68231 2022-12-14 stsp }
1921 eec68231 2022-12-14 stsp 
1922 eec68231 2022-12-14 stsp static void
1923 b0614828 2023-06-19 stsp apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1924 eec68231 2022-12-14 stsp {
1925 b0614828 2023-06-19 stsp 	if (need_tmpdir) {
1926 b0614828 2023-06-19 stsp 		if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1927 b0614828 2023-06-19 stsp 			fatal("unveil %s", GOT_TMPDIR_STR);
1928 b0614828 2023-06-19 stsp 	}
1929 b0614828 2023-06-19 stsp 
1930 eec68231 2022-12-14 stsp 	if (unveil(repo_path, "r") == -1)
1931 eec68231 2022-12-14 stsp 		fatal("unveil %s", repo_path);
1932 44587340 2022-12-30 stsp 
1933 44587340 2022-12-30 stsp 	if (unveil(NULL, NULL) == -1)
1934 44587340 2022-12-30 stsp 		fatal("unveil");
1935 44587340 2022-12-30 stsp }
1936 44587340 2022-12-30 stsp 
1937 44587340 2022-12-30 stsp static void
1938 ae7c1b78 2023-01-10 stsp apply_unveil_repo_readwrite(const char *repo_path)
1939 ae7c1b78 2023-01-10 stsp {
1940 ae7c1b78 2023-01-10 stsp 	if (unveil(repo_path, "rwc") == -1)
1941 ae7c1b78 2023-01-10 stsp 		fatal("unveil %s", repo_path);
1942 ae7c1b78 2023-01-10 stsp 
1943 ae7c1b78 2023-01-10 stsp 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1944 ae7c1b78 2023-01-10 stsp 		fatal("unveil %s", GOT_TMPDIR_STR);
1945 ae7c1b78 2023-01-10 stsp 
1946 ae7c1b78 2023-01-10 stsp 	if (unveil(NULL, NULL) == -1)
1947 ae7c1b78 2023-01-10 stsp 		fatal("unveil");
1948 ae7c1b78 2023-01-10 stsp }
1949 ae7c1b78 2023-01-10 stsp 
1950 ae7c1b78 2023-01-10 stsp static void
1951 44587340 2022-12-30 stsp apply_unveil_none(void)
1952 44587340 2022-12-30 stsp {
1953 44587340 2022-12-30 stsp 	if (unveil("/", "") == -1)
1954 44587340 2022-12-30 stsp 		fatal("unveil");
1955 eec68231 2022-12-14 stsp 
1956 eec68231 2022-12-14 stsp 	if (unveil(NULL, NULL) == -1)
1957 eec68231 2022-12-14 stsp 		fatal("unveil");
1958 13b2bc37 2022-10-23 stsp }
1959 13b2bc37 2022-10-23 stsp 
1960 13b2bc37 2022-10-23 stsp static void
1961 ae7c1b78 2023-01-10 stsp apply_unveil_selfexec(void)
1962 13b2bc37 2022-10-23 stsp {
1963 b50a2b46 2022-12-29 stsp 	if (unveil(gotd.argv0, "x") == -1)
1964 b50a2b46 2022-12-29 stsp 		fatal("unveil %s", gotd.argv0);
1965 b50a2b46 2022-12-29 stsp 
1966 13b2bc37 2022-10-23 stsp 	if (unveil(NULL, NULL) == -1)
1967 13b2bc37 2022-10-23 stsp 		fatal("unveil");
1968 13b2bc37 2022-10-23 stsp }
1969 13b2bc37 2022-10-23 stsp 
1970 abe89edb 2023-11-16 stsp static void
1971 abe89edb 2023-11-16 stsp set_max_datasize(void)
1972 abe89edb 2023-11-16 stsp {
1973 abe89edb 2023-11-16 stsp 	struct rlimit rl;
1974 abe89edb 2023-11-16 stsp 
1975 abe89edb 2023-11-16 stsp 	if (getrlimit(RLIMIT_DATA, &rl) != 0)
1976 abe89edb 2023-11-16 stsp 		return;
1977 abe89edb 2023-11-16 stsp 
1978 abe89edb 2023-11-16 stsp 	rl.rlim_cur = rl.rlim_max;
1979 abe89edb 2023-11-16 stsp 	setrlimit(RLIMIT_DATA, &rl);
1980 ba97b2d7 2024-03-20 stsp }
1981 ba97b2d7 2024-03-20 stsp 
1982 ba97b2d7 2024-03-20 stsp static void
1983 ba97b2d7 2024-03-20 stsp unveil_notification_helpers(void)
1984 ba97b2d7 2024-03-20 stsp {
1985 ba97b2d7 2024-03-20 stsp 	const char *helpers[] = {
1986 ba97b2d7 2024-03-20 stsp 	    GOTD_PATH_PROG_NOTIFY_EMAIL,
1987 ba97b2d7 2024-03-20 stsp 	    GOTD_PATH_PROG_NOTIFY_HTTP,
1988 ba97b2d7 2024-03-20 stsp 	};
1989 ba97b2d7 2024-03-20 stsp 	size_t i;
1990 ba97b2d7 2024-03-20 stsp 
1991 ba97b2d7 2024-03-20 stsp 	for (i = 0; i < nitems(helpers); i++) {
1992 ba97b2d7 2024-03-20 stsp 		if (unveil(helpers[i], "x") == 0)
1993 ba97b2d7 2024-03-20 stsp 			continue;
1994 ba97b2d7 2024-03-20 stsp 		fatal("unveil %s", helpers[i]);
1995 ba97b2d7 2024-03-20 stsp 	}
1996 ba97b2d7 2024-03-20 stsp 
1997 ba97b2d7 2024-03-20 stsp 	if (unveil(NULL, NULL) == -1)
1998 ba97b2d7 2024-03-20 stsp 		fatal("unveil");
1999 abe89edb 2023-11-16 stsp }
2000 abe89edb 2023-11-16 stsp 
2001 13b2bc37 2022-10-23 stsp int
2002 13b2bc37 2022-10-23 stsp main(int argc, char **argv)
2003 13b2bc37 2022-10-23 stsp {
2004 13b2bc37 2022-10-23 stsp 	const struct got_error *error = NULL;
2005 13b2bc37 2022-10-23 stsp 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
2006 13b2bc37 2022-10-23 stsp 	const char *confpath = GOTD_CONF_PATH;
2007 13b2bc37 2022-10-23 stsp 	char *argv0 = argv[0];
2008 13b2bc37 2022-10-23 stsp 	char title[2048];
2009 13b2bc37 2022-10-23 stsp 	struct passwd *pw = NULL;
2010 13b2bc37 2022-10-23 stsp 	char *repo_path = NULL;
2011 13b2bc37 2022-10-23 stsp 	enum gotd_procid proc_id = PROC_GOTD;
2012 839338f6 2023-06-22 op 	struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
2013 13b2bc37 2022-10-23 stsp 	int *pack_fds = NULL, *temp_fds = NULL;
2014 9afa3de2 2023-04-04 stsp 	struct gotd_repo *repo = NULL;
2015 ba97b2d7 2024-03-20 stsp 	char *default_sender = NULL;
2016 ba97b2d7 2024-03-20 stsp 	char hostname[HOST_NAME_MAX + 1];
2017 ba97b2d7 2024-03-20 stsp 	FILE *diff_f1 = NULL, *diff_f2 = NULL;
2018 ba97b2d7 2024-03-20 stsp 	int diff_fd1 = -1, diff_fd2 = -1;
2019 13b2bc37 2022-10-23 stsp 
2020 839338f6 2023-06-22 op 	TAILQ_INIT(&procs);
2021 839338f6 2023-06-22 op 
2022 13b2bc37 2022-10-23 stsp 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
2023 13b2bc37 2022-10-23 stsp 
2024 ba97b2d7 2024-03-20 stsp 	while ((ch = getopt(argc, argv, "Adf:LnNP:RsSvW")) != -1) {
2025 13b2bc37 2022-10-23 stsp 		switch (ch) {
2026 5e25db14 2022-12-29 stsp 		case 'A':
2027 5e25db14 2022-12-29 stsp 			proc_id = PROC_AUTH;
2028 5e25db14 2022-12-29 stsp 			break;
2029 13b2bc37 2022-10-23 stsp 		case 'd':
2030 13b2bc37 2022-10-23 stsp 			daemonize = 0;
2031 13b2bc37 2022-10-23 stsp 			break;
2032 13b2bc37 2022-10-23 stsp 		case 'f':
2033 13b2bc37 2022-10-23 stsp 			confpath = optarg;
2034 13b2bc37 2022-10-23 stsp 			break;
2035 d93ecf7d 2022-12-14 stsp 		case 'L':
2036 d93ecf7d 2022-12-14 stsp 			proc_id = PROC_LISTEN;
2037 d93ecf7d 2022-12-14 stsp 			break;
2038 13b2bc37 2022-10-23 stsp 		case 'n':
2039 13b2bc37 2022-10-23 stsp 			noaction = 1;
2040 13b2bc37 2022-10-23 stsp 			break;
2041 ba97b2d7 2024-03-20 stsp 		case 'N':
2042 ba97b2d7 2024-03-20 stsp 			proc_id = PROC_NOTIFY;
2043 ba97b2d7 2024-03-20 stsp 			break;
2044 6f319063 2022-10-27 stsp 		case 'P':
2045 6f319063 2022-10-27 stsp 			repo_path = realpath(optarg, NULL);
2046 6f319063 2022-10-27 stsp 			if (repo_path == NULL)
2047 6f319063 2022-10-27 stsp 				fatal("realpath '%s'", optarg);
2048 13b2bc37 2022-10-23 stsp 			break;
2049 13b2bc37 2022-10-23 stsp 		case 'R':
2050 13b2bc37 2022-10-23 stsp 			proc_id = PROC_REPO_READ;
2051 13b2bc37 2022-10-23 stsp 			break;
2052 b0614828 2023-06-19 stsp 		case 's':
2053 b0614828 2023-06-19 stsp 			proc_id = PROC_SESSION_READ;
2054 b0614828 2023-06-19 stsp 			break;
2055 ae7c1b78 2023-01-10 stsp 		case 'S':
2056 b0614828 2023-06-19 stsp 			proc_id = PROC_SESSION_WRITE;
2057 ae7c1b78 2023-01-10 stsp 			break;
2058 6f319063 2022-10-27 stsp 		case 'v':
2059 6f319063 2022-10-27 stsp 			if (verbosity < 3)
2060 6f319063 2022-10-27 stsp 				verbosity++;
2061 6f319063 2022-10-27 stsp 			break;
2062 13b2bc37 2022-10-23 stsp 		case 'W':
2063 13b2bc37 2022-10-23 stsp 			proc_id = PROC_REPO_WRITE;
2064 13b2bc37 2022-10-23 stsp 			break;
2065 13b2bc37 2022-10-23 stsp 		default:
2066 13b2bc37 2022-10-23 stsp 			usage();
2067 13b2bc37 2022-10-23 stsp 		}
2068 13b2bc37 2022-10-23 stsp 	}
2069 13b2bc37 2022-10-23 stsp 
2070 13b2bc37 2022-10-23 stsp 	argc -= optind;
2071 13b2bc37 2022-10-23 stsp 	argv += optind;
2072 13b2bc37 2022-10-23 stsp 
2073 13b2bc37 2022-10-23 stsp 	if (argc != 0)
2074 13b2bc37 2022-10-23 stsp 		usage();
2075 b50a2b46 2022-12-29 stsp 
2076 b50a2b46 2022-12-29 stsp 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
2077 13b2bc37 2022-10-23 stsp 		fatalx("need root privileges");
2078 13b2bc37 2022-10-23 stsp 
2079 4b3827cd 2023-07-08 stsp 	if (parse_config(confpath, proc_id, &gotd) != 0)
2080 13b2bc37 2022-10-23 stsp 		return 1;
2081 13b2bc37 2022-10-23 stsp 
2082 13b2bc37 2022-10-23 stsp 	pw = getpwnam(gotd.user_name);
2083 13b2bc37 2022-10-23 stsp 	if (pw == NULL)
2084 898c8f8f 2022-12-29 op 		fatalx("user %s not found", gotd.user_name);
2085 13b2bc37 2022-10-23 stsp 
2086 f4e8c21c 2023-01-17 op 	if (pw->pw_uid == 0)
2087 f4e8c21c 2023-01-17 op 		fatalx("cannot run %s as the superuser", getprogname());
2088 13b2bc37 2022-10-23 stsp 
2089 f4e8c21c 2023-01-17 op 	if (noaction) {
2090 f4e8c21c 2023-01-17 op 		fprintf(stderr, "configuration OK\n");
2091 13b2bc37 2022-10-23 stsp 		return 0;
2092 f4e8c21c 2023-01-17 op 	}
2093 13b2bc37 2022-10-23 stsp 
2094 f4e8c21c 2023-01-17 op 	gotd.argv0 = argv0;
2095 f4e8c21c 2023-01-17 op 	gotd.daemonize = daemonize;
2096 f4e8c21c 2023-01-17 op 	gotd.verbosity = verbosity;
2097 f4e8c21c 2023-01-17 op 	gotd.confpath = confpath;
2098 f4e8c21c 2023-01-17 op 
2099 f4e8c21c 2023-01-17 op 	/* Require an absolute path in argv[0] for reliable re-exec. */
2100 f4e8c21c 2023-01-17 op 	if (!got_path_is_absolute(argv0))
2101 f4e8c21c 2023-01-17 op 		fatalx("bad path \"%s\": must be an absolute path", argv0);
2102 f4e8c21c 2023-01-17 op 
2103 f4e8c21c 2023-01-17 op 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
2104 f4e8c21c 2023-01-17 op 	log_setverbose(verbosity);
2105 f4e8c21c 2023-01-17 op 
2106 b1142068 2022-12-05 stsp 	if (proc_id == PROC_GOTD) {
2107 d93ecf7d 2022-12-14 stsp 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2108 d93ecf7d 2022-12-14 stsp 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
2109 d93ecf7d 2022-12-14 stsp 		if (daemonize && daemon(1, 0) == -1)
2110 d93ecf7d 2022-12-14 stsp 			fatal("daemon");
2111 f7eb3370 2023-01-23 stsp 		gotd.pid = getpid();
2112 f7eb3370 2023-01-23 stsp 		start_listener(argv0, confpath, daemonize, verbosity);
2113 ba97b2d7 2024-03-20 stsp 		start_notifier(argv0, confpath, daemonize, verbosity);
2114 d93ecf7d 2022-12-14 stsp 	} else if (proc_id == PROC_LISTEN) {
2115 d93ecf7d 2022-12-14 stsp 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2116 b1142068 2022-12-05 stsp 		if (verbosity) {
2117 b1142068 2022-12-05 stsp 			log_info("socket: %s", gotd.unix_socket_path);
2118 b1142068 2022-12-05 stsp 			log_info("user: %s", pw->pw_name);
2119 b1142068 2022-12-05 stsp 		}
2120 13b2bc37 2022-10-23 stsp 
2121 13b2bc37 2022-10-23 stsp 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
2122 6f854dde 2023-01-04 stsp 		    pw->pw_gid);
2123 13b2bc37 2022-10-23 stsp 		if (fd == -1) {
2124 13b2bc37 2022-10-23 stsp 			fatal("cannot listen on unix socket %s",
2125 13b2bc37 2022-10-23 stsp 			    gotd.unix_socket_path);
2126 13b2bc37 2022-10-23 stsp 		}
2127 5e25db14 2022-12-29 stsp 	} else if (proc_id == PROC_AUTH) {
2128 5e25db14 2022-12-29 stsp 		snprintf(title, sizeof(title), "%s %s",
2129 5e25db14 2022-12-29 stsp 		    gotd_proc_names[proc_id], repo_path);
2130 ae7c1b78 2023-01-10 stsp 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
2131 b0614828 2023-06-19 stsp 	    proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
2132 13b2bc37 2022-10-23 stsp 		error = got_repo_pack_fds_open(&pack_fds);
2133 13b2bc37 2022-10-23 stsp 		if (error != NULL)
2134 13b2bc37 2022-10-23 stsp 			fatalx("cannot open pack tempfiles: %s", error->msg);
2135 13b2bc37 2022-10-23 stsp 		error = got_repo_temp_fds_open(&temp_fds);
2136 13b2bc37 2022-10-23 stsp 		if (error != NULL)
2137 13b2bc37 2022-10-23 stsp 			fatalx("cannot open pack tempfiles: %s", error->msg);
2138 13b2bc37 2022-10-23 stsp 		if (repo_path == NULL)
2139 13b2bc37 2022-10-23 stsp 			fatalx("repository path not specified");
2140 13b2bc37 2022-10-23 stsp 		snprintf(title, sizeof(title), "%s %s",
2141 13b2bc37 2022-10-23 stsp 		    gotd_proc_names[proc_id], repo_path);
2142 ba97b2d7 2024-03-20 stsp 	} else if (proc_id == PROC_NOTIFY) {
2143 ba97b2d7 2024-03-20 stsp 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2144 ba97b2d7 2024-03-20 stsp 		if (gethostname(hostname, sizeof(hostname)) == -1)
2145 ba97b2d7 2024-03-20 stsp 			fatal("gethostname");
2146 ba97b2d7 2024-03-20 stsp 		if (asprintf(&default_sender, "%s@%s",
2147 ba97b2d7 2024-03-20 stsp 		    pw->pw_name, hostname) == -1)
2148 ba97b2d7 2024-03-20 stsp 			fatal("asprintf");
2149 13b2bc37 2022-10-23 stsp 	} else
2150 13b2bc37 2022-10-23 stsp 		fatal("invalid process id %d", proc_id);
2151 13b2bc37 2022-10-23 stsp 
2152 13b2bc37 2022-10-23 stsp 	setproctitle("%s", title);
2153 13b2bc37 2022-10-23 stsp 	log_procinit(title);
2154 13b2bc37 2022-10-23 stsp 
2155 13b2bc37 2022-10-23 stsp 	/* Drop root privileges. */
2156 13b2bc37 2022-10-23 stsp 	if (setgid(pw->pw_gid) == -1)
2157 13b2bc37 2022-10-23 stsp 		fatal("setgid %d failed", pw->pw_gid);
2158 13b2bc37 2022-10-23 stsp 	if (setuid(pw->pw_uid) == -1)
2159 13b2bc37 2022-10-23 stsp 		fatal("setuid %d failed", pw->pw_uid);
2160 13b2bc37 2022-10-23 stsp 
2161 13b2bc37 2022-10-23 stsp 	event_init();
2162 13b2bc37 2022-10-23 stsp 
2163 13b2bc37 2022-10-23 stsp 	switch (proc_id) {
2164 13b2bc37 2022-10-23 stsp 	case PROC_GOTD:
2165 13b2bc37 2022-10-23 stsp #ifndef PROFILE
2166 ae7c1b78 2023-01-10 stsp 		/* "exec" promise will be limited to argv[0] via unveil(2). */
2167 ae7c1b78 2023-01-10 stsp 		if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
2168 13b2bc37 2022-10-23 stsp 			err(1, "pledge");
2169 13b2bc37 2022-10-23 stsp #endif
2170 13b2bc37 2022-10-23 stsp 		break;
2171 d93ecf7d 2022-12-14 stsp 	case PROC_LISTEN:
2172 d93ecf7d 2022-12-14 stsp #ifndef PROFILE
2173 77f619a8 2023-01-04 stsp 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
2174 d93ecf7d 2022-12-14 stsp 			err(1, "pledge");
2175 d93ecf7d 2022-12-14 stsp #endif
2176 77f619a8 2023-01-04 stsp 		/*
2177 77f619a8 2023-01-04 stsp 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
2178 77f619a8 2023-01-04 stsp 		 * sockets by revoking all filesystem access via unveil(2).
2179 77f619a8 2023-01-04 stsp 		 */
2180 77f619a8 2023-01-04 stsp 		apply_unveil_none();
2181 77f619a8 2023-01-04 stsp 
2182 40b85cca 2023-01-03 stsp 		listen_main(title, fd, gotd.connection_limits,
2183 40b85cca 2023-01-03 stsp 		    gotd.nconnection_limits);
2184 d93ecf7d 2022-12-14 stsp 		/* NOTREACHED */
2185 d93ecf7d 2022-12-14 stsp 		break;
2186 5e25db14 2022-12-29 stsp 	case PROC_AUTH:
2187 5e25db14 2022-12-29 stsp #ifndef PROFILE
2188 44587340 2022-12-30 stsp 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
2189 5e25db14 2022-12-29 stsp 			err(1, "pledge");
2190 5e25db14 2022-12-29 stsp #endif
2191 44587340 2022-12-30 stsp 		/*
2192 44587340 2022-12-30 stsp 		 * We need the "unix" pledge promise for getpeername(2) only.
2193 44587340 2022-12-30 stsp 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
2194 44587340 2022-12-30 stsp 		 * filesystem access via unveil(2). Access to password database
2195 44587340 2022-12-30 stsp 		 * files will still work since "getpw" bypasses unveil(2).
2196 44587340 2022-12-30 stsp 		 */
2197 44587340 2022-12-30 stsp 		apply_unveil_none();
2198 44587340 2022-12-30 stsp 
2199 5e25db14 2022-12-29 stsp 		auth_main(title, &gotd.repos, repo_path);
2200 5e25db14 2022-12-29 stsp 		/* NOTREACHED */
2201 5e25db14 2022-12-29 stsp 		break;
2202 b0614828 2023-06-19 stsp 	case PROC_SESSION_READ:
2203 b0614828 2023-06-19 stsp 	case PROC_SESSION_WRITE:
2204 ae7c1b78 2023-01-10 stsp #ifndef PROFILE
2205 ae7c1b78 2023-01-10 stsp 		/*
2206 ae7c1b78 2023-01-10 stsp 		 * The "recvfd" promise is only needed during setup and
2207 ae7c1b78 2023-01-10 stsp 		 * will be removed in a later pledge(2) call.
2208 ae7c1b78 2023-01-10 stsp 		 */
2209 ae7c1b78 2023-01-10 stsp 		if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
2210 ae7c1b78 2023-01-10 stsp 		    "unveil", NULL) == -1)
2211 ae7c1b78 2023-01-10 stsp 			err(1, "pledge");
2212 ae7c1b78 2023-01-10 stsp #endif
2213 b0614828 2023-06-19 stsp 		if (proc_id == PROC_SESSION_READ)
2214 b0614828 2023-06-19 stsp 			apply_unveil_repo_readonly(repo_path, 1);
2215 ba97b2d7 2024-03-20 stsp 		else {
2216 b0614828 2023-06-19 stsp 			apply_unveil_repo_readwrite(repo_path);
2217 ba97b2d7 2024-03-20 stsp 			repo = gotd_find_repo_by_path(repo_path, &gotd);
2218 ba97b2d7 2024-03-20 stsp 			if (repo == NULL)
2219 ba97b2d7 2024-03-20 stsp 				fatalx("no repository for path %s", repo_path);
2220 ba97b2d7 2024-03-20 stsp 		}
2221 e70fd952 2024-03-22 stsp 		if (proc_id == PROC_SESSION_READ)
2222 e70fd952 2024-03-22 stsp 			session_read_main(title, repo_path, pack_fds, temp_fds,
2223 e70fd952 2024-03-22 stsp 			    &gotd.request_timeout, repo);
2224 e70fd952 2024-03-22 stsp 		else
2225 e70fd952 2024-03-22 stsp 			session_write_main(title, repo_path, pack_fds, temp_fds,
2226 e70fd952 2024-03-22 stsp 			    &gotd.request_timeout, repo);
2227 ae7c1b78 2023-01-10 stsp 		/* NOTREACHED */
2228 ae7c1b78 2023-01-10 stsp 		break;
2229 13b2bc37 2022-10-23 stsp 	case PROC_REPO_READ:
2230 abe89edb 2023-11-16 stsp 		set_max_datasize();
2231 13b2bc37 2022-10-23 stsp #ifndef PROFILE
2232 eec68231 2022-12-14 stsp 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2233 13b2bc37 2022-10-23 stsp 			err(1, "pledge");
2234 13b2bc37 2022-10-23 stsp #endif
2235 b0614828 2023-06-19 stsp 		apply_unveil_repo_readonly(repo_path, 0);
2236 eec68231 2022-12-14 stsp 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2237 13b2bc37 2022-10-23 stsp 		/* NOTREACHED */
2238 13b2bc37 2022-10-23 stsp 		exit(0);
2239 13b2bc37 2022-10-23 stsp 	case PROC_REPO_WRITE:
2240 abe89edb 2023-11-16 stsp 		set_max_datasize();
2241 ba97b2d7 2024-03-20 stsp 
2242 ba97b2d7 2024-03-20 stsp 		diff_f1 = got_opentemp();
2243 ba97b2d7 2024-03-20 stsp 		if (diff_f1 == NULL)
2244 ba97b2d7 2024-03-20 stsp 			fatal("got_opentemp");
2245 ba97b2d7 2024-03-20 stsp 		diff_f2 = got_opentemp();
2246 ba97b2d7 2024-03-20 stsp 		if (diff_f2 == NULL)
2247 ba97b2d7 2024-03-20 stsp 			fatal("got_opentemp");
2248 ba97b2d7 2024-03-20 stsp 		diff_fd1 = got_opentempfd();
2249 ba97b2d7 2024-03-20 stsp 		if (diff_fd1 == -1)
2250 ba97b2d7 2024-03-20 stsp 			fatal("got_opentempfd");
2251 ba97b2d7 2024-03-20 stsp 		diff_fd2 = got_opentempfd();
2252 ba97b2d7 2024-03-20 stsp 		if (diff_fd2 == -1)
2253 ba97b2d7 2024-03-20 stsp 			fatal("got_opentempfd");
2254 13b2bc37 2022-10-23 stsp #ifndef PROFILE
2255 eec68231 2022-12-14 stsp 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2256 13b2bc37 2022-10-23 stsp 			err(1, "pledge");
2257 13b2bc37 2022-10-23 stsp #endif
2258 b0614828 2023-06-19 stsp 		apply_unveil_repo_readonly(repo_path, 0);
2259 9afa3de2 2023-04-04 stsp 		repo = gotd_find_repo_by_path(repo_path, &gotd);
2260 9afa3de2 2023-04-04 stsp 		if (repo == NULL)
2261 9afa3de2 2023-04-04 stsp 			fatalx("no repository for path %s", repo_path);
2262 9afa3de2 2023-04-04 stsp 		repo_write_main(title, repo_path, pack_fds, temp_fds,
2263 ba97b2d7 2024-03-20 stsp 		    diff_f1, diff_f2, diff_fd1, diff_fd2,
2264 9afa3de2 2023-04-04 stsp 		    &repo->protected_tag_namespaces,
2265 9afa3de2 2023-04-04 stsp 		    &repo->protected_branch_namespaces,
2266 9afa3de2 2023-04-04 stsp 		    &repo->protected_branches);
2267 13b2bc37 2022-10-23 stsp 		/* NOTREACHED */
2268 13b2bc37 2022-10-23 stsp 		exit(0);
2269 ba97b2d7 2024-03-20 stsp 	case PROC_NOTIFY:
2270 ba97b2d7 2024-03-20 stsp #ifndef PROFILE
2271 ba97b2d7 2024-03-20 stsp 		if (pledge("stdio proc exec recvfd unveil", NULL) == -1)
2272 ba97b2d7 2024-03-20 stsp 			err(1, "pledge");
2273 ba97b2d7 2024-03-20 stsp #endif
2274 ba97b2d7 2024-03-20 stsp 		/*
2275 ba97b2d7 2024-03-20 stsp 		 * Limit "exec" promise to notification helpers via unveil(2).
2276 ba97b2d7 2024-03-20 stsp 		 */
2277 ba97b2d7 2024-03-20 stsp 		unveil_notification_helpers();
2278 ba97b2d7 2024-03-20 stsp 
2279 ba97b2d7 2024-03-20 stsp 		notify_main(title, &gotd.repos, default_sender);
2280 ba97b2d7 2024-03-20 stsp 		/* NOTREACHED */
2281 ba97b2d7 2024-03-20 stsp 		exit(0);
2282 13b2bc37 2022-10-23 stsp 	default:
2283 13b2bc37 2022-10-23 stsp 		fatal("invalid process id %d", proc_id);
2284 13b2bc37 2022-10-23 stsp 	}
2285 13b2bc37 2022-10-23 stsp 
2286 13b2bc37 2022-10-23 stsp 	if (proc_id != PROC_GOTD)
2287 13b2bc37 2022-10-23 stsp 		fatal("invalid process id %d", proc_id);
2288 13b2bc37 2022-10-23 stsp 
2289 839338f6 2023-06-22 op 	evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2290 839338f6 2023-06-22 op 	    gotd.listen_proc);
2291 ba97b2d7 2024-03-20 stsp 	if (gotd.notify_proc) {
2292 ba97b2d7 2024-03-20 stsp 		evtimer_set(&gotd.notify_proc->tmo, kill_proc_timeout,
2293 ba97b2d7 2024-03-20 stsp 		    gotd.notify_proc);
2294 ba97b2d7 2024-03-20 stsp 	}
2295 839338f6 2023-06-22 op 
2296 ae7c1b78 2023-01-10 stsp 	apply_unveil_selfexec();
2297 13b2bc37 2022-10-23 stsp 
2298 13b2bc37 2022-10-23 stsp 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2299 13b2bc37 2022-10-23 stsp 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2300 13b2bc37 2022-10-23 stsp 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2301 13b2bc37 2022-10-23 stsp 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2302 839338f6 2023-06-22 op 	signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2303 13b2bc37 2022-10-23 stsp 	signal(SIGPIPE, SIG_IGN);
2304 13b2bc37 2022-10-23 stsp 
2305 13b2bc37 2022-10-23 stsp 	signal_add(&evsigint, NULL);
2306 13b2bc37 2022-10-23 stsp 	signal_add(&evsigterm, NULL);
2307 13b2bc37 2022-10-23 stsp 	signal_add(&evsighup, NULL);
2308 13b2bc37 2022-10-23 stsp 	signal_add(&evsigusr1, NULL);
2309 839338f6 2023-06-22 op 	signal_add(&evsigchld, NULL);
2310 13b2bc37 2022-10-23 stsp 
2311 c929736a 2023-06-22 op 	gotd_imsg_event_add(&gotd.listen_proc->iev);
2312 ba97b2d7 2024-03-20 stsp 	if (gotd.notify_proc)
2313 ba97b2d7 2024-03-20 stsp 		gotd_imsg_event_add(&gotd.notify_proc->iev);
2314 13b2bc37 2022-10-23 stsp 
2315 13b2bc37 2022-10-23 stsp 	event_dispatch();
2316 13b2bc37 2022-10-23 stsp 
2317 13b2bc37 2022-10-23 stsp 	free(repo_path);
2318 ba97b2d7 2024-03-20 stsp 	free(default_sender);
2319 ae7c1b78 2023-01-10 stsp 	gotd_shutdown();
2320 ae7c1b78 2023-01-10 stsp 
2321 13b2bc37 2022-10-23 stsp 	return 0;
2322 13b2bc37 2022-10-23 stsp }