| 1 | /* |
| 2 | ** Copyright 2000-2018 Double Precision, Inc. See COPYING for |
| 3 | ** distribution information. |
| 4 | */ |
| 5 | |
| 6 | #include "courier_auth_config.h" |
| 7 | #include <sys/types.h> |
| 8 | #include <sys/stat.h> |
| 9 | #include <sys/socket.h> |
| 10 | #include <sys/un.h> |
| 11 | #include <sys/time.h> |
| 12 | #include <sys/wait.h> |
| 13 | #include <unistd.h> |
| 14 | #include <stdlib.h> |
| 15 | #include <stdio.h> |
| 16 | #include <errno.h> |
| 17 | #include <signal.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <ctype.h> |
| 20 | #include "numlib/numlib.h" |
| 21 | #include "liblock/liblock.h" |
| 22 | #include "auth.h" |
| 23 | #include "authdaemonrc.h" |
| 24 | #include "courierauthdebug.h" |
| 25 | #include "pkglibdir.h" |
| 26 | #include "courierauth.h" |
| 27 | #include "courierauthstaticlist.h" |
| 28 | #include "libhmac/hmac.h" |
| 29 | #include <ltdl.h> |
| 30 | |
| 31 | |
| 32 | #ifndef SOMAXCONN |
| 33 | #define SOMAXCONN 5 |
| 34 | #endif |
| 35 | |
| 36 | #include "courierauthstaticlist.h" |
| 37 | |
| 38 | static unsigned ndaemons; |
| 39 | |
| 40 | struct authstaticinfolist { |
| 41 | struct authstaticinfolist *next; |
| 42 | struct authstaticinfo *info; |
| 43 | lt_dlhandle h; |
| 44 | }; |
| 45 | |
| 46 | static struct authstaticinfolist *modulelist=NULL; |
| 47 | |
| 48 | static int mksocket() |
| 49 | { |
| 50 | int fd=socket(PF_UNIX, SOCK_STREAM, 0); |
| 51 | struct sockaddr_un skun; |
| 52 | |
| 53 | if (fd < 0) return (-1); |
| 54 | skun.sun_family=AF_UNIX; |
| 55 | strcpy(skun.sun_path, AUTHDAEMONSOCK); |
| 56 | strcat(skun.sun_path, ".tmp"); |
| 57 | unlink(skun.sun_path); |
| 58 | if (bind(fd, (const struct sockaddr *)&skun, sizeof(skun)) || |
| 59 | listen(fd, SOMAXCONN) || |
| 60 | chmod(skun.sun_path, 0777) || |
| 61 | rename(skun.sun_path, AUTHDAEMONSOCK) || |
| 62 | fcntl(fd, F_SETFD, FD_CLOEXEC) < 0 || |
| 63 | fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
| 64 | { |
| 65 | perror(AUTHDAEMONSOCK); |
| 66 | close(fd); |
| 67 | return (-1); |
| 68 | } |
| 69 | return (fd); |
| 70 | } |
| 71 | |
| 72 | |
| 73 | static int initmodules(const char *p) |
| 74 | { |
| 75 | char buf[100]; |
| 76 | char buf2[100]; |
| 77 | struct authstaticinfolist **modptr= &modulelist; |
| 78 | struct authstaticinfolist *m; |
| 79 | |
| 80 | if (ndaemons <= 0) |
| 81 | { |
| 82 | ndaemons=1; |
| 83 | |
| 84 | fprintf(stderr, "ERR: Configuration error - missing 'daemons' setting, using %u\n", |
| 85 | ndaemons); |
| 86 | } |
| 87 | |
| 88 | while ((m=modulelist) != NULL) |
| 89 | { |
| 90 | modulelist=m->next; |
| 91 | fprintf(stderr, "INFO: Uninstalling %s\n", |
| 92 | m->info->auth_name); |
| 93 | lt_dlclose(m->h); |
| 94 | free(m); |
| 95 | } |
| 96 | |
| 97 | while (p && *p) |
| 98 | { |
| 99 | size_t i; |
| 100 | lt_dlhandle h; |
| 101 | lt_ptr pt; |
| 102 | struct authstaticinfo *a; |
| 103 | |
| 104 | if (isspace((int)(unsigned char)*p)) |
| 105 | { |
| 106 | ++p; |
| 107 | continue; |
| 108 | } |
| 109 | |
| 110 | for (i=0; p[i] && !isspace((int)(unsigned char)p[i]); ++i) |
| 111 | ; |
| 112 | |
| 113 | strcpy(buf, "lib"); |
| 114 | strncat(buf, p, i>40 ? 40:i); |
| 115 | |
| 116 | fprintf(stderr, "INFO: Installing %s\n", buf); |
| 117 | p += i; |
| 118 | h=lt_dlopenext(buf); |
| 119 | |
| 120 | if (h == NULL) |
| 121 | { |
| 122 | fprintf(stderr, "INFO: %s\n", lt_dlerror()); |
| 123 | continue; |
| 124 | } |
| 125 | |
| 126 | sprintf(buf2, "courier_%s_init", buf+3); |
| 127 | |
| 128 | pt=lt_dlsym(h, buf2); |
| 129 | if (pt == NULL) |
| 130 | { |
| 131 | fprintf(stderr, |
| 132 | "ERR: Can't locate init function %s.\n", |
| 133 | buf2); |
| 134 | fprintf(stderr, "ERR: %s\n", lt_dlerror()); |
| 135 | continue; |
| 136 | } |
| 137 | |
| 138 | a= (*(struct authstaticinfo *(*)(void))pt)(); |
| 139 | |
| 140 | if ((m=malloc(sizeof(*modulelist))) == NULL) |
| 141 | { |
| 142 | perror("ERR"); |
| 143 | lt_dlclose(h); |
| 144 | continue; |
| 145 | } |
| 146 | *modptr=m; |
| 147 | m->next=NULL; |
| 148 | m->info=a; |
| 149 | m->h=h; |
| 150 | modptr= &m->next; |
| 151 | fprintf(stderr, "INFO: Installation complete: %s\n", |
| 152 | a->auth_name); |
| 153 | } |
| 154 | return (0); |
| 155 | } |
| 156 | |
| 157 | static int readconfig() |
| 158 | { |
| 159 | char buf[BUFSIZ]; |
| 160 | FILE *fp; |
| 161 | char *modlist=0; |
| 162 | unsigned daemons=0; |
| 163 | |
| 164 | if ((fp=fopen(AUTHDAEMONRC, "r")) == NULL) |
| 165 | { |
| 166 | perror(AUTHDAEMONRC); |
| 167 | return (-1); |
| 168 | } |
| 169 | |
| 170 | while (fgets(buf, sizeof(buf), fp)) |
| 171 | { |
| 172 | char *p=strchr(buf, '\n'), *q; |
| 173 | |
| 174 | if (!p) |
| 175 | { |
| 176 | int c; |
| 177 | |
| 178 | while ((c=getc(fp)) >= 0 && c != '\n') |
| 179 | ; |
| 180 | } |
| 181 | else *p=0; |
| 182 | if ((p=strchr(buf, '#')) != 0) *p=0; |
| 183 | |
| 184 | for (p=buf; *p; p++) |
| 185 | if (!isspace((int)(unsigned char)*p)) |
| 186 | break; |
| 187 | if (*p == 0) continue; |
| 188 | |
| 189 | if ((p=strchr(buf, '=')) == 0) |
| 190 | { |
| 191 | fprintf(stderr, "ERR: Bad line in %s: %s\n", |
| 192 | AUTHDAEMONRC, buf); |
| 193 | fclose(fp); |
| 194 | if (modlist) |
| 195 | free(modlist); |
| 196 | return (-1); |
| 197 | } |
| 198 | *p++=0; |
| 199 | while (*p && isspace((int)(unsigned char)*p)) |
| 200 | ++p; |
| 201 | if (*p == '"') |
| 202 | { |
| 203 | ++p; |
| 204 | q=strchr(p, '"'); |
| 205 | if (q) *q=0; |
| 206 | } |
| 207 | if (strcmp(buf, "authmodulelist") == 0) |
| 208 | { |
| 209 | if (modlist) |
| 210 | free(modlist); |
| 211 | modlist=strdup(p); |
| 212 | if (!modlist) |
| 213 | { |
| 214 | perror("malloc"); |
| 215 | fclose(fp); |
| 216 | return (-1); |
| 217 | } |
| 218 | continue; |
| 219 | } |
| 220 | if (strcmp(buf, "daemons") == 0) |
| 221 | { |
| 222 | daemons=atoi(p); |
| 223 | continue; |
| 224 | } |
| 225 | } |
| 226 | fclose(fp); |
| 227 | |
| 228 | fprintf(stderr, "INFO: modules=\"%s\", daemons=%u\n", |
| 229 | modlist ? modlist:"(none)", |
| 230 | daemons); |
| 231 | ndaemons=daemons; |
| 232 | return (initmodules(modlist)); |
| 233 | } |
| 234 | |
| 235 | static char buf[BUFSIZ]; |
| 236 | static char *readptr; |
| 237 | static int readleft; |
| 238 | static char *writeptr; |
| 239 | static int writeleft; |
| 240 | |
| 241 | static int getauthc(int fd) |
| 242 | { |
| 243 | fd_set fds; |
| 244 | struct timeval tv; |
| 245 | |
| 246 | if (readleft--) |
| 247 | return ( (int)(unsigned char)*readptr++ ); |
| 248 | |
| 249 | readleft=0; |
| 250 | FD_ZERO(&fds); |
| 251 | FD_SET(fd, &fds); |
| 252 | tv.tv_sec=10; |
| 253 | tv.tv_usec=0; |
| 254 | if (select(fd+1, &fds, 0, 0, &tv) <= 0 || |
| 255 | !FD_ISSET(fd, &fds)) |
| 256 | return (EOF); |
| 257 | readleft=read(fd, buf, sizeof(buf)); |
| 258 | readptr=buf; |
| 259 | if (readleft <= 0) |
| 260 | { |
| 261 | readleft=0; |
| 262 | return (EOF); |
| 263 | } |
| 264 | --readleft; |
| 265 | return ( (int)(unsigned char)*readptr++ ); |
| 266 | } |
| 267 | |
| 268 | static int writeauth(int fd, const char *p, unsigned pl) |
| 269 | { |
| 270 | fd_set fds; |
| 271 | struct timeval tv; |
| 272 | |
| 273 | while (pl) |
| 274 | { |
| 275 | int n; |
| 276 | |
| 277 | FD_ZERO(&fds); |
| 278 | FD_SET(fd, &fds); |
| 279 | tv.tv_sec=30; |
| 280 | tv.tv_usec=0; |
| 281 | if (select(fd+1, 0, &fds, 0, &tv) <= 0 || |
| 282 | !FD_ISSET(fd, &fds)) |
| 283 | return (-1); |
| 284 | n=write(fd, p, pl); |
| 285 | if (n <= 0) return (-1); |
| 286 | p += n; |
| 287 | pl -= n; |
| 288 | } |
| 289 | return (0); |
| 290 | } |
| 291 | |
| 292 | static int writeauthflush(int fd) |
| 293 | { |
| 294 | if (writeptr > buf) |
| 295 | { |
| 296 | if (writeauth(fd, buf, writeptr - buf)) |
| 297 | return (-1); |
| 298 | } |
| 299 | writeptr=buf; |
| 300 | writeleft=sizeof(buf); |
| 301 | return (0); |
| 302 | } |
| 303 | |
| 304 | static int writeauthbuf(int fd, const char *p, unsigned pl) |
| 305 | { |
| 306 | unsigned n; |
| 307 | |
| 308 | while (pl) |
| 309 | { |
| 310 | if (pl < writeleft) |
| 311 | { |
| 312 | memcpy(writeptr, p, pl); |
| 313 | writeptr += pl; |
| 314 | writeleft -= pl; |
| 315 | return (0); |
| 316 | } |
| 317 | |
| 318 | if (writeauthflush(fd)) return (-1); |
| 319 | |
| 320 | n=pl; |
| 321 | if (n > writeleft) n=writeleft; |
| 322 | memcpy(writeptr, p, n); |
| 323 | p += n; |
| 324 | writeptr += n; |
| 325 | writeleft -= n; |
| 326 | pl -= n; |
| 327 | } |
| 328 | return (0); |
| 329 | } |
| 330 | |
| 331 | static int writeenvval(int fd, const char *env, const char *val) |
| 332 | { |
| 333 | if (writeauthbuf(fd, env, strlen(env)) || |
| 334 | writeauthbuf(fd, "=", 1) || |
| 335 | writeauthbuf(fd, val, strlen(val)) || |
| 336 | writeauthbuf(fd, "\n", 1)) |
| 337 | return (-1); |
| 338 | return (0); |
| 339 | } |
| 340 | |
| 341 | static const char *findopt(const char *options, const char *keyword) |
| 342 | { |
| 343 | size_t keyword_l=strlen(keyword); |
| 344 | |
| 345 | while (options) |
| 346 | { |
| 347 | if (strncmp(options, keyword, keyword_l) == 0) |
| 348 | { |
| 349 | switch (options[keyword_l]) |
| 350 | { |
| 351 | case '=': |
| 352 | return options + keyword_l + 1; |
| 353 | case ',': case '\0': |
| 354 | return options + keyword_l; |
| 355 | } |
| 356 | } |
| 357 | options=strchr(options, ','); |
| 358 | if (options) |
| 359 | ++options; |
| 360 | } |
| 361 | return NULL; |
| 362 | } |
| 363 | |
| 364 | /* Returns a malloc'd string containing the merge of the options string |
| 365 | and any default options which apply, or NULL if no options at all */ |
| 366 | static char *mergeoptions(const char *options) |
| 367 | { |
| 368 | char *defoptions = getenv("DEFAULTOPTIONS"); |
| 369 | char *p; |
| 370 | |
| 371 | if (options && *options && defoptions && *defoptions) |
| 372 | { |
| 373 | char *result = malloc(strlen(options) + |
| 374 | strlen(defoptions) + 2); |
| 375 | if (!result) |
| 376 | { |
| 377 | perror("malloc"); |
| 378 | return NULL; |
| 379 | } |
| 380 | strcpy(result, options); |
| 381 | |
| 382 | defoptions = strdup(defoptions); |
| 383 | if (!defoptions) |
| 384 | { |
| 385 | perror("malloc"); |
| 386 | free(result); |
| 387 | return NULL; |
| 388 | } |
| 389 | |
| 390 | for (p = strtok(defoptions, ","); p; p = strtok(0, ",")) |
| 391 | { |
| 392 | char *q = strchr(p, '='); |
| 393 | if (q) *q = '\0'; |
| 394 | if (findopt(result, p)) continue; |
| 395 | if (q) *q = '='; |
| 396 | strcat(result, ","); |
| 397 | strcat(result, p); |
| 398 | } |
| 399 | free(defoptions); |
| 400 | return result; |
| 401 | } |
| 402 | else if (options && *options) |
| 403 | { |
| 404 | return strdup(options); |
| 405 | } |
| 406 | else if (defoptions && *defoptions) |
| 407 | { |
| 408 | return strdup(defoptions); |
| 409 | } |
| 410 | else |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | static int printauth(struct authinfo *authinfo, void *vp) |
| 415 | { |
| 416 | int fd= *(int *)vp; |
| 417 | char buf2[NUMBUFSIZE]; |
| 418 | char *fullopt; |
| 419 | |
| 420 | writeptr=buf; |
| 421 | writeleft=sizeof(buf); |
| 422 | |
| 423 | courier_authdebug_authinfo("Authenticated: ", authinfo, |
| 424 | authinfo->clearpasswd, |
| 425 | authinfo->passwd); |
| 426 | |
| 427 | if (authinfo->sysusername) |
| 428 | if (writeenvval(fd, "USERNAME", authinfo->sysusername)) |
| 429 | return (1); |
| 430 | if (authinfo->sysuserid) |
| 431 | if (writeenvval(fd, "UID", libmail_str_uid_t(*authinfo->sysuserid, |
| 432 | buf2))) |
| 433 | return (1); |
| 434 | if (writeenvval(fd, "GID", libmail_str_uid_t(authinfo->sysgroupid, buf2))) |
| 435 | return (1); |
| 436 | |
| 437 | if (writeenvval(fd, "HOME", authinfo->homedir)) |
| 438 | return (1); |
| 439 | if (authinfo->address) |
| 440 | if (writeenvval(fd, "ADDRESS", authinfo->address)) |
| 441 | return (1); |
| 442 | if (authinfo->fullname) |
| 443 | { |
| 444 | /* |
| 445 | * Only the first field of the comma-seperated GECOS field is the |
| 446 | * full username. |
| 447 | */ |
| 448 | char *fullname; |
| 449 | char *p; |
| 450 | int retval; |
| 451 | |
| 452 | fullname=strdup(authinfo->fullname); |
| 453 | if(fullname == NULL) |
| 454 | { |
| 455 | perror("strdup"); |
| 456 | return (1); |
| 457 | } |
| 458 | |
| 459 | p = fullname; |
| 460 | while (*p != ',' && *p != '\0') |
| 461 | p++; |
| 462 | *p=0; |
| 463 | retval = writeenvval(fd, "NAME", fullname); |
| 464 | free(fullname); |
| 465 | if(retval) |
| 466 | return (1); |
| 467 | } |
| 468 | if (authinfo->maildir) |
| 469 | if (writeenvval(fd, "MAILDIR", authinfo->maildir)) |
| 470 | return (1); |
| 471 | if (authinfo->quota) |
| 472 | if (writeenvval(fd, "QUOTA", authinfo->quota)) |
| 473 | return (1); |
| 474 | if (authinfo->passwd) |
| 475 | if (writeenvval(fd, "PASSWD", authinfo->passwd)) |
| 476 | return (1); |
| 477 | if (authinfo->clearpasswd) |
| 478 | if (writeenvval(fd, "PASSWD2", authinfo->clearpasswd)) |
| 479 | return (1); |
| 480 | fullopt = mergeoptions(authinfo->options); |
| 481 | if (fullopt) |
| 482 | { |
| 483 | int rc = writeenvval(fd, "OPTIONS", fullopt); |
| 484 | free(fullopt); |
| 485 | if (rc) |
| 486 | return (1); |
| 487 | } |
| 488 | if (writeauthbuf(fd, ".\n", 2) || writeauthflush(fd)) |
| 489 | return (1); |
| 490 | return (0); |
| 491 | } |
| 492 | |
| 493 | static void pre(int fd, char *prebuf) |
| 494 | { |
| 495 | char *p=strchr(prebuf, ' '); |
| 496 | char *service; |
| 497 | struct authstaticinfolist *l; |
| 498 | |
| 499 | if (!p) return; |
| 500 | *p++=0; |
| 501 | while (*p == ' ') ++p; |
| 502 | service=p; |
| 503 | p=strchr(p, ' '); |
| 504 | if (!p) return; |
| 505 | *p++=0; |
| 506 | while (*p == ' ') ++p; |
| 507 | |
| 508 | DPRINTF("received userid lookup request: %s", p); |
| 509 | |
| 510 | for (l=modulelist; l; l=l->next) |
| 511 | { |
| 512 | struct authstaticinfo *auth=l->info; |
| 513 | const char *modname = auth->auth_name; |
| 514 | int rc; |
| 515 | |
| 516 | if (strcmp(prebuf, ".") && strcmp(prebuf, modname)) |
| 517 | continue; |
| 518 | |
| 519 | DPRINTF("%s: trying this module", modname); |
| 520 | |
| 521 | |
| 522 | rc=(*auth->auth_prefunc)(p, service, |
| 523 | &printauth, &fd); |
| 524 | |
| 525 | if (rc == 0) |
| 526 | return; |
| 527 | |
| 528 | if (rc > 0) |
| 529 | { |
| 530 | DPRINTF("%s: TEMPFAIL - no more modules will be tried", |
| 531 | modname); |
| 532 | return; /* Temporary error */ |
| 533 | } |
| 534 | DPRINTF("%s: REJECT - try next module", modname); |
| 535 | } |
| 536 | writeauth(fd, "FAIL\n", 5); |
| 537 | DPRINTF("FAIL, all modules rejected"); |
| 538 | } |
| 539 | |
| 540 | struct enumerate_info { |
| 541 | int fd; |
| 542 | char *buf_ptr; |
| 543 | size_t buf_left; |
| 544 | char buffer[BUFSIZ]; |
| 545 | int enumerate_ok; |
| 546 | }; |
| 547 | |
| 548 | static void enumflush(struct enumerate_info *ei) |
| 549 | { |
| 550 | if (ei->buf_ptr > ei->buffer) |
| 551 | writeauth(ei->fd, ei->buffer, ei->buf_ptr - ei->buffer); |
| 552 | ei->buf_ptr=ei->buffer; |
| 553 | ei->buf_left=sizeof(ei->buffer); |
| 554 | } |
| 555 | |
| 556 | static void enumwrite(struct enumerate_info *ei, const char *s) |
| 557 | { |
| 558 | while (s && *s) |
| 559 | { |
| 560 | size_t l; |
| 561 | |
| 562 | if (ei->buf_left == 0) |
| 563 | enumflush(ei); |
| 564 | |
| 565 | l=strlen(s); |
| 566 | if (l > ei->buf_left) |
| 567 | l=ei->buf_left; |
| 568 | memcpy(ei->buf_ptr, s, l); |
| 569 | ei->buf_ptr += l; |
| 570 | ei->buf_left -= l; |
| 571 | s += l; |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | static void enum_cb(const char *name, |
| 576 | uid_t uid, |
| 577 | gid_t gid, |
| 578 | const char *homedir, |
| 579 | const char *maildir, |
| 580 | const char *options, |
| 581 | void *void_arg) |
| 582 | { |
| 583 | struct enumerate_info *ei=(struct enumerate_info *)void_arg; |
| 584 | char buf[NUMBUFSIZE]; |
| 585 | char *fullopt; |
| 586 | |
| 587 | if (name == NULL) |
| 588 | { |
| 589 | ei->enumerate_ok=1; |
| 590 | return; |
| 591 | } |
| 592 | |
| 593 | enumwrite(ei, name); |
| 594 | enumwrite(ei, "\t"); |
| 595 | enumwrite(ei, libmail_str_uid_t(uid, buf)); |
| 596 | enumwrite(ei, "\t"); |
| 597 | enumwrite(ei, libmail_str_gid_t(gid, buf)); |
| 598 | enumwrite(ei, "\t"); |
| 599 | enumwrite(ei, homedir); |
| 600 | enumwrite(ei, "\t"); |
| 601 | enumwrite(ei, maildir ? maildir : ""); |
| 602 | enumwrite(ei, "\t"); |
| 603 | fullopt = mergeoptions(options); |
| 604 | if (fullopt) |
| 605 | { |
| 606 | enumwrite(ei, fullopt); |
| 607 | free (fullopt); |
| 608 | } |
| 609 | enumwrite(ei, "\n"); |
| 610 | } |
| 611 | |
| 612 | static void enumerate(int fd) |
| 613 | { |
| 614 | struct enumerate_info ei; |
| 615 | struct authstaticinfolist *l; |
| 616 | |
| 617 | ei.fd=fd; |
| 618 | ei.buf_ptr=ei.buffer; |
| 619 | ei.buf_left=0; |
| 620 | |
| 621 | for (l=modulelist; l; l=l->next) |
| 622 | { |
| 623 | struct authstaticinfo *auth=l->info; |
| 624 | |
| 625 | if (auth->auth_enumerate == NULL) |
| 626 | continue; |
| 627 | |
| 628 | enumwrite(&ei, "# "); |
| 629 | enumwrite(&ei, auth->auth_name); |
| 630 | enumwrite(&ei, "\n\n"); |
| 631 | ei.enumerate_ok=0; |
| 632 | (*auth->auth_enumerate)(enum_cb, &ei); |
| 633 | if (!ei.enumerate_ok) |
| 634 | { |
| 635 | enumflush(&ei); |
| 636 | DPRINTF("enumeration terminated prematurely in module %s", |
| 637 | auth->auth_name); |
| 638 | return; |
| 639 | } |
| 640 | } |
| 641 | enumwrite(&ei, ".\n"); |
| 642 | enumflush(&ei); |
| 643 | } |
| 644 | |
| 645 | static void dopasswd(int, const char *, const char *, const char *, |
| 646 | const char *); |
| 647 | |
| 648 | static void passwd(int fd, char *prebuf) |
| 649 | { |
| 650 | char *p; |
| 651 | const char *service; |
| 652 | const char *userid; |
| 653 | const char *opwd; |
| 654 | const char *npwd; |
| 655 | |
| 656 | for (p=prebuf; *p; p++) |
| 657 | { |
| 658 | if (*p == '\t') |
| 659 | continue; |
| 660 | if ((int)(unsigned char)*p < ' ') |
| 661 | { |
| 662 | writeauth(fd, "FAIL\n", 5); |
| 663 | return; |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | service=prebuf; |
| 668 | |
| 669 | if ((p=strchr(service, '\t')) != 0) |
| 670 | { |
| 671 | *p++=0; |
| 672 | userid=p; |
| 673 | if ((p=strchr(p, '\t')) != 0) |
| 674 | { |
| 675 | *p++=0; |
| 676 | opwd=p; |
| 677 | if ((p=strchr(p, '\t')) != 0) |
| 678 | { |
| 679 | *p++=0; |
| 680 | npwd=p; |
| 681 | if ((p=strchr(p, '\t')) != 0) |
| 682 | *p=0; |
| 683 | dopasswd(fd, service, userid, opwd, npwd); |
| 684 | return; |
| 685 | } |
| 686 | } |
| 687 | } |
| 688 | } |
| 689 | |
| 690 | static void dopasswd(int fd, |
| 691 | const char *service, |
| 692 | const char *userid, |
| 693 | const char *opwd, |
| 694 | const char *npwd) |
| 695 | { |
| 696 | struct authstaticinfolist *l; |
| 697 | |
| 698 | |
| 699 | for (l=modulelist; l; l=l->next) |
| 700 | { |
| 701 | struct authstaticinfo *auth=l->info; |
| 702 | int rc; |
| 703 | |
| 704 | int (*f)(const char *, const char *, const char *, |
| 705 | const char *)= |
| 706 | auth->auth_changepwd; |
| 707 | |
| 708 | if (!f) |
| 709 | continue; |
| 710 | |
| 711 | rc= (*f)(service, userid, opwd, npwd); |
| 712 | |
| 713 | if (rc == 0) |
| 714 | { |
| 715 | writeauth(fd, "OK\n", 3); |
| 716 | return; |
| 717 | } |
| 718 | if (rc > 0) |
| 719 | break; |
| 720 | } |
| 721 | writeauth(fd, "FAIL\n", 5); |
| 722 | } |
| 723 | |
| 724 | static void auth(int fd, char *p) |
| 725 | { |
| 726 | char *service; |
| 727 | char *authtype; |
| 728 | char *pp; |
| 729 | struct authstaticinfolist *l; |
| 730 | |
| 731 | service=p; |
| 732 | if ((p=strchr(p, '\n')) == 0) return; |
| 733 | *p++=0; |
| 734 | authtype=p; |
| 735 | if ((p=strchr(p, '\n')) == 0) return; |
| 736 | *p++=0; |
| 737 | |
| 738 | pp=malloc(strlen(p)+1); |
| 739 | if (!pp) |
| 740 | { |
| 741 | perror("CRIT: malloc() failed"); |
| 742 | return; |
| 743 | } |
| 744 | |
| 745 | DPRINTF("received auth request, service=%s, authtype=%s", service, authtype); |
| 746 | for (l=modulelist; l; l=l->next) |
| 747 | { |
| 748 | struct authstaticinfo *auth=l->info; |
| 749 | const char *modname = auth->auth_name; |
| 750 | int rc; |
| 751 | |
| 752 | DPRINTF("%s: trying this module", modname); |
| 753 | |
| 754 | rc=(*auth->auth_func)(service, authtype, |
| 755 | strcpy(pp, p), |
| 756 | &printauth, &fd); |
| 757 | |
| 758 | if (rc == 0) |
| 759 | { |
| 760 | free(pp); |
| 761 | return; |
| 762 | } |
| 763 | |
| 764 | if (rc > 0) |
| 765 | { |
| 766 | DPRINTF("%s: TEMPFAIL - no more modules will be tried", modname); |
| 767 | free(pp); |
| 768 | return; /* Temporary error */ |
| 769 | } |
| 770 | DPRINTF("%s: REJECT - try next module", modname); |
| 771 | } |
| 772 | DPRINTF("FAIL, all modules rejected"); |
| 773 | writeauth(fd, "FAIL\n", 5); |
| 774 | free(pp); |
| 775 | } |
| 776 | |
| 777 | static void idlefunc() |
| 778 | { |
| 779 | struct authstaticinfolist *l; |
| 780 | |
| 781 | for (l=modulelist; l; l=l->next) |
| 782 | { |
| 783 | struct authstaticinfo *auth=l->info; |
| 784 | |
| 785 | if (auth->auth_idle) |
| 786 | (*auth->auth_idle)(); |
| 787 | } |
| 788 | } |
| 789 | |
| 790 | static void doauth(int fd) |
| 791 | { |
| 792 | char buf[BUFSIZ]; |
| 793 | int i, ch; |
| 794 | char *p; |
| 795 | |
| 796 | readleft=0; |
| 797 | for (i=0; (ch=getauthc(fd)) != '\n'; i++) |
| 798 | { |
| 799 | if (ch < 0 || i >= sizeof(buf)-2) |
| 800 | return; |
| 801 | buf[i]=ch; |
| 802 | } |
| 803 | buf[i]=0; |
| 804 | |
| 805 | for (p=buf; *p; p++) |
| 806 | { |
| 807 | if (*p == ' ') |
| 808 | { |
| 809 | *p++=0; |
| 810 | while (*p == ' ') ++p; |
| 811 | break; |
| 812 | } |
| 813 | } |
| 814 | |
| 815 | if (strcmp(buf, "PRE") == 0) |
| 816 | { |
| 817 | pre(fd, p); |
| 818 | return; |
| 819 | } |
| 820 | |
| 821 | if (strcmp(buf, "PASSWD") == 0) |
| 822 | { |
| 823 | passwd(fd, p); |
| 824 | return; |
| 825 | } |
| 826 | |
| 827 | if (strcmp(buf, "AUTH") == 0) |
| 828 | { |
| 829 | int j; |
| 830 | |
| 831 | i=atoi(p); |
| 832 | if (i < 0 || i >= sizeof(buf)) return; |
| 833 | for (j=0; j<i; j++) |
| 834 | { |
| 835 | ch=getauthc(fd); |
| 836 | if (ch < 0) return; |
| 837 | buf[j]=ch; |
| 838 | } |
| 839 | buf[j]=0; |
| 840 | auth(fd, buf); |
| 841 | } |
| 842 | |
| 843 | if (strcmp(buf, "ENUMERATE") == 0) |
| 844 | { |
| 845 | enumerate(fd); |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | static int sighup_pipe= -1; |
| 850 | |
| 851 | static void sighup(int n) |
| 852 | { |
| 853 | if (sighup_pipe >= 0) |
| 854 | { |
| 855 | close(sighup_pipe); |
| 856 | sighup_pipe= -1; |
| 857 | } |
| 858 | signal(SIGHUP, sighup); |
| 859 | } |
| 860 | |
| 861 | static int sigterm_received=0; |
| 862 | |
| 863 | static void sigterm(int n) |
| 864 | { |
| 865 | sigterm_received=1; |
| 866 | if (sighup_pipe >= 0) |
| 867 | { |
| 868 | close(sighup_pipe); |
| 869 | sighup_pipe= -1; |
| 870 | } |
| 871 | else |
| 872 | { |
| 873 | kill(0, SIGTERM); |
| 874 | _exit(0); |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | static int startchildren(int *pipefd) |
| 879 | { |
| 880 | unsigned i; |
| 881 | pid_t p; |
| 882 | |
| 883 | signal(SIGCHLD, sighup); |
| 884 | for (i=0; i<ndaemons; i++) |
| 885 | { |
| 886 | p=fork(); |
| 887 | while (p == -1) |
| 888 | { |
| 889 | perror("CRIT: fork() failed"); |
| 890 | sleep(5); |
| 891 | p=fork(); |
| 892 | } |
| 893 | if (p == 0) |
| 894 | { |
| 895 | sighup_pipe= -1; |
| 896 | close(pipefd[1]); |
| 897 | signal(SIGHUP, SIG_DFL); |
| 898 | signal(SIGTERM, SIG_DFL); |
| 899 | signal(SIGCHLD, SIG_DFL); |
| 900 | return (1); |
| 901 | } |
| 902 | } |
| 903 | return (0); |
| 904 | } |
| 905 | |
| 906 | static int killchildren(int *pipefd) |
| 907 | { |
| 908 | int waitstat; |
| 909 | |
| 910 | while (wait(&waitstat) >= 0 || errno != ECHILD) |
| 911 | ; |
| 912 | |
| 913 | if (pipe(pipefd)) |
| 914 | { |
| 915 | perror("CRIT: pipe() failed"); |
| 916 | return (-1); |
| 917 | } |
| 918 | |
| 919 | return (0); |
| 920 | } |
| 921 | |
| 922 | int start() |
| 923 | { |
| 924 | int s; |
| 925 | int fd; |
| 926 | int pipefd[2]; |
| 927 | int do_child; |
| 928 | |
| 929 | for (fd=3; fd<256; fd++) |
| 930 | close(fd); |
| 931 | |
| 932 | if (pipe(pipefd)) |
| 933 | { |
| 934 | perror("pipe"); |
| 935 | return (1); |
| 936 | } |
| 937 | |
| 938 | if (lt_dlinit()) |
| 939 | { |
| 940 | fprintf(stderr, "ERR: lt_dlinit() failed: %s\n", |
| 941 | lt_dlerror()); |
| 942 | exit(1); |
| 943 | } |
| 944 | |
| 945 | if (lt_dlsetsearchpath(PKGLIBDIR)) |
| 946 | { |
| 947 | fprintf(stderr, "ERR: lt_dlsetsearchpath() failed: %s\n", |
| 948 | lt_dlerror()); |
| 949 | exit(1); |
| 950 | } |
| 951 | |
| 952 | if (readconfig()) |
| 953 | { |
| 954 | close(pipefd[0]); |
| 955 | close(pipefd[1]); |
| 956 | return (1); |
| 957 | } |
| 958 | |
| 959 | s=mksocket(); |
| 960 | if (s < 0) |
| 961 | { |
| 962 | perror(AUTHDAEMONSOCK); |
| 963 | close(pipefd[0]); |
| 964 | close(pipefd[1]); |
| 965 | return (1); |
| 966 | } |
| 967 | |
| 968 | signal(SIGPIPE, SIG_IGN); |
| 969 | signal(SIGHUP, sighup); |
| 970 | signal(SIGTERM, sigterm); |
| 971 | |
| 972 | close(0); |
| 973 | if (open("/dev/null", O_RDWR) != 0) |
| 974 | { |
| 975 | perror("open"); |
| 976 | exit(1); |
| 977 | } |
| 978 | dup2(0, 1); |
| 979 | sighup_pipe= pipefd[1]; |
| 980 | |
| 981 | do_child=startchildren(pipefd); |
| 982 | |
| 983 | for (;;) |
| 984 | { |
| 985 | struct sockaddr saddr; |
| 986 | socklen_t saddr_len; |
| 987 | fd_set fds; |
| 988 | struct timeval tv; |
| 989 | |
| 990 | FD_ZERO(&fds); |
| 991 | FD_SET(pipefd[0], &fds); |
| 992 | |
| 993 | if (do_child) |
| 994 | FD_SET(s, &fds); |
| 995 | |
| 996 | tv.tv_sec=300; |
| 997 | tv.tv_usec=0; |
| 998 | |
| 999 | if (select( (s > pipefd[0] ? s:pipefd[0])+1, |
| 1000 | &fds, 0, 0, &tv) < 0) |
| 1001 | continue; |
| 1002 | if (FD_ISSET(pipefd[0], &fds)) |
| 1003 | { |
| 1004 | close(pipefd[0]); |
| 1005 | if (do_child) |
| 1006 | return (0); /* Parent died */ |
| 1007 | fprintf(stderr, "INFO: stopping authdaemond children\n"); |
| 1008 | while (killchildren(pipefd)) |
| 1009 | sleep(5); |
| 1010 | if (sigterm_received) |
| 1011 | return (0); |
| 1012 | fprintf(stderr, "INFO: restarting authdaemond children\n"); |
| 1013 | readconfig(); |
| 1014 | sighup_pipe=pipefd[1]; |
| 1015 | do_child=startchildren(pipefd); |
| 1016 | continue; |
| 1017 | } |
| 1018 | |
| 1019 | if (!FD_ISSET(s, &fds)) |
| 1020 | { |
| 1021 | idlefunc(); |
| 1022 | continue; |
| 1023 | } |
| 1024 | |
| 1025 | saddr_len=sizeof(saddr); |
| 1026 | if ((fd=accept(s, &saddr, &saddr_len)) < 0) |
| 1027 | continue; |
| 1028 | if (fcntl(fd, F_SETFL, 0) < 0 || |
| 1029 | fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) |
| 1030 | { |
| 1031 | perror("CRIT: fcntl() failed"); |
| 1032 | } |
| 1033 | else |
| 1034 | doauth(fd); |
| 1035 | close(fd); |
| 1036 | } |
| 1037 | } |