1/* $OpenBSD: control.c,v 1.39 2024/05/21 05:00:47 jsg Exp $ */ 2 3/* 4 * Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org> 5 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#include <sys/queue.h> 21#include <sys/stat.h> 22#include <sys/socket.h> 23#include <sys/un.h> 24#include <sys/tree.h> 25 26#include <errno.h> 27#include <event.h> 28#include <fcntl.h> 29#include <stdlib.h> 30#include <string.h> 31#include <unistd.h> 32#include <signal.h> 33 34#include "iked.h" 35 36#define CONTROL_BACKLOG 5 37 38struct ctl_connlist ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns); 39uint32_t ctl_peerid; 40 41void 42 control_accept(int, short, void *); 43struct ctl_conn 44 *control_connbyfd(int); 45void control_close(int, struct control_sock *); 46void control_dispatch_imsg(int, short, void *); 47void control_imsg_forward(struct imsg *); 48void control_imsg_forward_peerid(struct imsg *); 49void control_run(struct privsep *, struct privsep_proc *, void *); 50int control_dispatch_ikev2(int, struct privsep_proc *, struct imsg *); 51int control_dispatch_ca(int, struct privsep_proc *, struct imsg *); 52 53static struct privsep_proc procs[] = { 54 { "parent", PROC_PARENT, NULL }, 55 { "ikev2", PROC_IKEV2, control_dispatch_ikev2 }, 56 { "ca", PROC_CERT, control_dispatch_ca }, 57}; 58 59void 60control(struct privsep *ps, struct privsep_proc *p) 61{ 62 proc_run(ps, p, procs, nitems(procs), control_run, NULL); 63} 64 65void 66control_run(struct privsep *ps, struct privsep_proc *p, void *arg) 67{ 68 /* 69 * pledge in the control process: 70 * stdio - for malloc and basic I/O including events. 71 * unix - for the control socket. 72 */ 73 if (pledge("stdio unix recvfd", NULL) == -1) 74 fatal("pledge"); 75} 76 77int 78control_init(struct privsep *ps, struct control_sock *cs) 79{ 80 struct iked *env = iked_env; 81 struct sockaddr_un s_un; 82 int fd; 83 mode_t old_umask, mode; 84 85 if (cs->cs_name == NULL) 86 return (0); 87 88 if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0)) == -1) { 89 log_warn("%s: socket", __func__); 90 return (-1); 91 } 92 93 s_un.sun_family = AF_UNIX; 94 if (strlcpy(s_un.sun_path, cs->cs_name, 95 sizeof(s_un.sun_path)) >= sizeof(s_un.sun_path)) { 96 log_warn("%s: %s name too long", __func__, cs->cs_name); 97 close(fd); 98 return (-1); 99 } 100 101 if (unlink(cs->cs_name) == -1) 102 if (errno != ENOENT) { 103 log_warn("%s: unlink %s", __func__, cs->cs_name); 104 close(fd); 105 return (-1); 106 } 107 108 if (cs->cs_restricted) { 109 old_umask = umask(S_IXUSR|S_IXGRP|S_IXOTH); 110 mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; 111 } else { 112 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 113 mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP; 114 } 115 116 if (bind(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) { 117 log_warn("%s: bind: %s", __func__, cs->cs_name); 118 close(fd); 119 (void)umask(old_umask); 120 return (-1); 121 } 122 (void)umask(old_umask); 123 124 if (chmod(cs->cs_name, mode) == -1) { 125 log_warn("%s: chmod", __func__); 126 close(fd); 127 (void)unlink(cs->cs_name); 128 return (-1); 129 } 130 131 cs->cs_fd = fd; 132 cs->cs_env = env; 133 134 return (0); 135} 136 137int 138control_listen(struct control_sock *cs) 139{ 140 if (cs->cs_name == NULL) 141 return (0); 142 143 if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) { 144 log_warn("%s: listen", __func__); 145 return (-1); 146 } 147 148 event_set(&cs->cs_ev, cs->cs_fd, EV_READ, 149 control_accept, cs); 150 event_add(&cs->cs_ev, NULL); 151 evtimer_set(&cs->cs_evt, control_accept, cs); 152 153 return (0); 154} 155 156void 157control_accept(int listenfd, short event, void *arg) 158{ 159 struct control_sock *cs = arg; 160 int connfd; 161 socklen_t len; 162 struct sockaddr_un s_un; 163 struct ctl_conn *c; 164 struct ctl_conn *other; 165 166 event_add(&cs->cs_ev, NULL); 167 if ((event & EV_TIMEOUT)) 168 return; 169 170 len = sizeof(s_un); 171 if ((connfd = accept4(listenfd, 172 (struct sockaddr *)&s_un, &len, SOCK_NONBLOCK)) == -1) { 173 /* 174 * Pause accept if we are out of file descriptors, or 175 * libevent will haunt us here too. 176 */ 177 if (errno == ENFILE || errno == EMFILE) { 178 struct timeval evtpause = { 1, 0 }; 179 180 event_del(&cs->cs_ev); 181 evtimer_add(&cs->cs_evt, &evtpause); 182 } else if (errno != EWOULDBLOCK && errno != EINTR && 183 errno != ECONNABORTED) 184 log_warn("%s: accept", __func__); 185 return; 186 } 187 188 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) { 189 log_warn("%s", __func__); 190 close(connfd); 191 return; 192 } 193 194 imsg_init(&c->iev.ibuf, connfd); 195 c->iev.handler = control_dispatch_imsg; 196 c->iev.events = EV_READ; 197 c->iev.data = cs; 198 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, 199 c->iev.handler, c->iev.data); 200 event_add(&c->iev.ev, NULL); 201 202 /* O(n^2), but n is small */ 203 c->peerid = ctl_peerid++; 204 TAILQ_FOREACH(other, &ctl_conns, entry) 205 if (c->peerid == other->peerid) 206 c->peerid = ctl_peerid++; 207 208 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 209} 210 211struct ctl_conn * 212control_connbyfd(int fd) 213{ 214 struct ctl_conn *c; 215 216 TAILQ_FOREACH(c, &ctl_conns, entry) { 217 if (c->iev.ibuf.fd == fd) 218 break; 219 } 220 221 return (c); 222} 223 224void 225control_close(int fd, struct control_sock *cs) 226{ 227 struct ctl_conn *c; 228 229 if ((c = control_connbyfd(fd)) == NULL) { 230 log_warn("%s: fd %d: not found", __func__, fd); 231 return; 232 } 233 234 msgbuf_clear(&c->iev.ibuf.w); 235 TAILQ_REMOVE(&ctl_conns, c, entry); 236 237 event_del(&c->iev.ev); 238 close(c->iev.ibuf.fd); 239 240 /* Some file descriptors are available again. */ 241 if (evtimer_pending(&cs->cs_evt, NULL)) { 242 evtimer_del(&cs->cs_evt); 243 event_add(&cs->cs_ev, NULL); 244 } 245 246 free(c); 247} 248 249void 250control_dispatch_imsg(int fd, short event, void *arg) 251{ 252 struct control_sock *cs = arg; 253 struct iked *env = cs->cs_env; 254 struct ctl_conn *c; 255 struct imsg imsg; 256 int n, v; 257 258 if ((c = control_connbyfd(fd)) == NULL) { 259 log_warn("%s: fd %d: not found", __func__, fd); 260 return; 261 } 262 263 if (event & EV_READ) { 264 if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) || 265 n == 0) { 266 control_close(fd, cs); 267 return; 268 } 269 } 270 if (event & EV_WRITE) { 271 if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) { 272 control_close(fd, cs); 273 return; 274 } 275 } 276 277 for (;;) { 278 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { 279 control_close(fd, cs); 280 return; 281 } 282 283 if (n == 0) 284 break; 285 286 control_imsg_forward(&imsg); 287 288 /* record peerid of connection for reply */ 289 imsg.hdr.peerid = c->peerid; 290 291 switch (imsg.hdr.type) { 292 case IMSG_CTL_NOTIFY: 293 if (c->flags & CTL_CONN_NOTIFY) { 294 log_debug("%s: " 295 "client requested notify more than once", 296 __func__); 297 imsg_compose_event(&c->iev, IMSG_CTL_FAIL, 298 0, 0, -1, NULL, 0); 299 break; 300 } 301 c->flags |= CTL_CONN_NOTIFY; 302 break; 303 case IMSG_CTL_VERBOSE: 304 IMSG_SIZE_CHECK(&imsg, &v); 305 306 memcpy(&v, imsg.data, sizeof(v)); 307 log_setverbose(v); 308 309 proc_forward_imsg(&env->sc_ps, &imsg, PROC_PARENT, -1); 310 break; 311 case IMSG_CTL_RELOAD: 312 case IMSG_CTL_RESET: 313 case IMSG_CTL_COUPLE: 314 case IMSG_CTL_DECOUPLE: 315 case IMSG_CTL_ACTIVE: 316 case IMSG_CTL_PASSIVE: 317 proc_forward_imsg(&env->sc_ps, &imsg, PROC_PARENT, -1); 318 break; 319 case IMSG_CTL_RESET_ID: 320 proc_forward_imsg(&env->sc_ps, &imsg, PROC_IKEV2, -1); 321 break; 322 case IMSG_CTL_SHOW_SA: 323 case IMSG_CTL_SHOW_STATS: 324 proc_forward_imsg(&env->sc_ps, &imsg, PROC_IKEV2, -1); 325 break; 326 case IMSG_CTL_SHOW_CERTSTORE: 327 proc_forward_imsg(&env->sc_ps, &imsg, PROC_CERT, -1); 328 break; 329 default: 330 log_debug("%s: error handling imsg %d", 331 __func__, imsg.hdr.type); 332 break; 333 } 334 imsg_free(&imsg); 335 } 336 337 imsg_event_add(&c->iev); 338} 339 340void 341control_imsg_forward(struct imsg *imsg) 342{ 343 struct ctl_conn *c; 344 345 TAILQ_FOREACH(c, &ctl_conns, entry) 346 if (c->flags & CTL_CONN_NOTIFY) 347 imsg_compose_event(&c->iev, imsg->hdr.type, 348 0, imsg->hdr.pid, -1, imsg->data, 349 imsg->hdr.len - IMSG_HEADER_SIZE); 350} 351 352void 353control_imsg_forward_peerid(struct imsg *imsg) 354{ 355 struct ctl_conn *c; 356 357 TAILQ_FOREACH(c, &ctl_conns, entry) 358 if (c->peerid == imsg->hdr.peerid) 359 imsg_compose_event(&c->iev, imsg->hdr.type, 360 0, imsg->hdr.pid, -1, imsg->data, 361 imsg->hdr.len - IMSG_HEADER_SIZE); 362} 363 364int 365control_dispatch_ikev2(int fd, struct privsep_proc *p, struct imsg *imsg) 366{ 367 switch (imsg->hdr.type) { 368 case IMSG_CTL_SHOW_SA: 369 case IMSG_CTL_SHOW_STATS: 370 control_imsg_forward_peerid(imsg); 371 return (0); 372 default: 373 break; 374 } 375 376 return (-1); 377} 378 379int 380control_dispatch_ca(int fd, struct privsep_proc *p, struct imsg *imsg) 381{ 382 switch (imsg->hdr.type) { 383 case IMSG_CTL_SHOW_CERTSTORE: 384 control_imsg_forward_peerid(imsg); 385 return (0); 386 default: 387 break; 388 } 389 390 return (-1); 391} 392