| 1 | /* |
| 2 | ** Copyright 2000-2006 Double Precision, Inc. See COPYING for |
| 3 | ** distribution information. |
| 4 | */ |
| 5 | |
| 6 | #include "auth.h" |
| 7 | #include "authstaticlist.h" |
| 8 | #include "courierauthsasl.h" |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <string.h> |
| 12 | #if HAVE_UNISTD_H |
| 13 | #include <unistd.h> |
| 14 | #endif |
| 15 | #include <fcntl.h> |
| 16 | #include <sys/types.h> |
| 17 | #include <sys/socket.h> |
| 18 | #include <sys/un.h> |
| 19 | #include <sys/time.h> |
| 20 | #if HAVE_SYS_SELECT_H |
| 21 | #include <sys/select.h> |
| 22 | #endif |
| 23 | #include <unistd.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <stdio.h> |
| 26 | #include <errno.h> |
| 27 | #include "authdaemonrc.h" |
| 28 | #include "numlib/numlib.h" |
| 29 | |
| 30 | static int TIMEOUT_SOCK=10, |
| 31 | TIMEOUT_WRITE=10, |
| 32 | TIMEOUT_READ=30; |
| 33 | |
| 34 | static const char rcsid[]="$Id: authdaemonlib.c,v 1.17 2006/01/22 03:33:24 mrsam Exp $"; |
| 35 | |
| 36 | static int s_connect(int sockfd, |
| 37 | const struct sockaddr *addr, |
| 38 | size_t addr_s, |
| 39 | time_t connect_timeout) |
| 40 | { |
| 41 | fd_set fdr; |
| 42 | struct timeval tv; |
| 43 | int rc; |
| 44 | |
| 45 | #ifdef SOL_KEEPALIVE |
| 46 | setsockopt(sockfd, SOL_SOCKET, SOL_KEEPALIVE, |
| 47 | (const char *)&dummy, sizeof(dummy)); |
| 48 | #endif |
| 49 | |
| 50 | #ifdef SOL_LINGER |
| 51 | { |
| 52 | struct linger l; |
| 53 | |
| 54 | l.l_onoff=0; |
| 55 | l.l_linger=0; |
| 56 | |
| 57 | setsockopt(sockfd, SOL_SOCKET, SOL_LINGER, |
| 58 | (const char *)&l, sizeof(l)); |
| 59 | } |
| 60 | #endif |
| 61 | |
| 62 | /* |
| 63 | ** If configuration says to use the kernel's timeout settings, |
| 64 | ** just call connect, and be done with it. |
| 65 | */ |
| 66 | |
| 67 | if (connect_timeout == 0) |
| 68 | return ( connect(sockfd, addr, addr_s)); |
| 69 | |
| 70 | /* Asynchronous connect with timeout. */ |
| 71 | |
| 72 | if (fcntl(sockfd, F_SETFL, O_NONBLOCK) < 0) return (-1); |
| 73 | |
| 74 | if ( connect(sockfd, addr, addr_s) == 0) |
| 75 | { |
| 76 | /* That was easy, we're done. */ |
| 77 | |
| 78 | if (fcntl(sockfd, F_SETFL, 0) < 0) return (-1); |
| 79 | return (0); |
| 80 | } |
| 81 | |
| 82 | if (errno != EINPROGRESS) |
| 83 | return -1; |
| 84 | |
| 85 | /* Wait for the connection to go through, until the timeout expires */ |
| 86 | |
| 87 | FD_ZERO(&fdr); |
| 88 | FD_SET(sockfd, &fdr); |
| 89 | tv.tv_sec=connect_timeout; |
| 90 | tv.tv_usec=0; |
| 91 | |
| 92 | rc=select(sockfd+1, 0, &fdr, 0, &tv); |
| 93 | if (rc < 0) return (-1); |
| 94 | |
| 95 | if (!FD_ISSET(sockfd, &fdr)) |
| 96 | { |
| 97 | errno=ETIMEDOUT; |
| 98 | return (-1); |
| 99 | } |
| 100 | |
| 101 | { |
| 102 | int gserr; |
| 103 | socklen_t gslen = sizeof(gserr); |
| 104 | |
| 105 | if (getsockopt(sockfd, SOL_SOCKET, |
| 106 | SO_ERROR, |
| 107 | (char *)&gserr, &gslen)==0) |
| 108 | { |
| 109 | if (gserr == 0) |
| 110 | return 0; |
| 111 | |
| 112 | errno=gserr; |
| 113 | } |
| 114 | } |
| 115 | return (-1); |
| 116 | } |
| 117 | |
| 118 | static int opensock() |
| 119 | { |
| 120 | int s=socket(PF_UNIX, SOCK_STREAM, 0); |
| 121 | struct sockaddr_un skun; |
| 122 | |
| 123 | skun.sun_family=AF_UNIX; |
| 124 | strcpy(skun.sun_path, AUTHDAEMONSOCK); |
| 125 | |
| 126 | if (s < 0) |
| 127 | { |
| 128 | perror("CRIT: authdaemon: socket() failed"); |
| 129 | return (-1); |
| 130 | } |
| 131 | |
| 132 | { |
| 133 | const char *p=getenv("TIMEOUT_SOCK"); |
| 134 | int n=atoi(p ? p:"0"); |
| 135 | |
| 136 | if (n > 0) |
| 137 | TIMEOUT_SOCK=n; |
| 138 | } |
| 139 | |
| 140 | { |
| 141 | const char *p=getenv("TIMEOUT_READ"); |
| 142 | int n=atoi(p ? p:"0"); |
| 143 | |
| 144 | if (n > 0) |
| 145 | TIMEOUT_READ=n; |
| 146 | } |
| 147 | |
| 148 | { |
| 149 | const char *p=getenv("TIMEOUT_WRITE"); |
| 150 | int n=atoi(p ? p:"0"); |
| 151 | |
| 152 | if (n > 0) |
| 153 | TIMEOUT_WRITE=n; |
| 154 | } |
| 155 | |
| 156 | if (s_connect(s, (const struct sockaddr *)&skun, sizeof(skun), |
| 157 | TIMEOUT_SOCK)) |
| 158 | { |
| 159 | perror("ERR: authdaemon: s_connect() failed"); |
| 160 | if (errno == ETIMEDOUT || errno == ECONNREFUSED) |
| 161 | fprintf(stderr, "ERR: [Hint: perhaps authdaemond is not running?]\n"); |
| 162 | close(s); |
| 163 | return (-1); |
| 164 | } |
| 165 | return (s); |
| 166 | } |
| 167 | |
| 168 | static int writeauth(int fd, const char *p, unsigned pl) |
| 169 | { |
| 170 | fd_set fds; |
| 171 | struct timeval tv; |
| 172 | |
| 173 | while (pl) |
| 174 | { |
| 175 | int n; |
| 176 | |
| 177 | FD_ZERO(&fds); |
| 178 | FD_SET(fd, &fds); |
| 179 | tv.tv_sec=TIMEOUT_WRITE; |
| 180 | tv.tv_usec=0; |
| 181 | if (select(fd+1, 0, &fds, 0, &tv) <= 0 || !FD_ISSET(fd, &fds)) |
| 182 | return (-1); |
| 183 | n=write(fd, p, pl); |
| 184 | if (n <= 0) return (-1); |
| 185 | p += n; |
| 186 | pl -= n; |
| 187 | } |
| 188 | return (0); |
| 189 | } |
| 190 | |
| 191 | static void readauth(int fd, char *p, unsigned pl, const char *term) |
| 192 | { |
| 193 | time_t end_time, curtime; |
| 194 | unsigned len = 0, tlen = strlen(term); |
| 195 | |
| 196 | --pl; |
| 197 | |
| 198 | time(&end_time); |
| 199 | end_time += TIMEOUT_READ; |
| 200 | |
| 201 | while (pl) |
| 202 | { |
| 203 | int n; |
| 204 | fd_set fds; |
| 205 | struct timeval tv; |
| 206 | |
| 207 | time(&curtime); |
| 208 | if (curtime >= end_time) |
| 209 | break; |
| 210 | |
| 211 | FD_ZERO(&fds); |
| 212 | FD_SET(fd, &fds); |
| 213 | tv.tv_sec=end_time - curtime; |
| 214 | tv.tv_usec=0; |
| 215 | if (select(fd+1, &fds, 0, 0, &tv) <= 0 || !FD_ISSET(fd, &fds)) |
| 216 | break; |
| 217 | |
| 218 | n=read(fd, p, pl); |
| 219 | if (n <= 0) |
| 220 | break; |
| 221 | p += n; |
| 222 | pl -= n; |
| 223 | /* end-of-message detection for authpipe */ |
| 224 | len += n; |
| 225 | if (len >= tlen && strncmp(p-tlen, term, tlen) == 0) |
| 226 | break; |
| 227 | else if (len == 5 && strncmp(p-5, "FAIL\n", 5) == 0) |
| 228 | break; |
| 229 | } |
| 230 | *p=0; |
| 231 | } |
| 232 | |
| 233 | int _authdaemondopasswd(int wrfd, int rdfd, char *buffer, int bufsiz) |
| 234 | { |
| 235 | if (writeauth(wrfd, buffer, strlen(buffer))) |
| 236 | return 1; |
| 237 | |
| 238 | readauth(rdfd, buffer, bufsiz, "\n"); |
| 239 | |
| 240 | if (strcmp(buffer, "OK\n")) |
| 241 | { |
| 242 | errno=EPERM; |
| 243 | return -1; |
| 244 | } |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | int authdaemondopasswd(char *buffer, int bufsiz) |
| 249 | { |
| 250 | int s=opensock(); |
| 251 | int rc; |
| 252 | |
| 253 | if (s < 0) |
| 254 | return (1); |
| 255 | rc = _authdaemondopasswd(s, s, buffer, bufsiz); |
| 256 | close(s); |
| 257 | return rc; |
| 258 | } |
| 259 | |
| 260 | int _authdaemondo(int wrfd, int rdfd, const char *authreq, |
| 261 | int (*func)(struct authinfo *, void *), void *arg) |
| 262 | { |
| 263 | char buf[BUFSIZ]; |
| 264 | char *p, *q, *r; |
| 265 | struct authinfo a; |
| 266 | uid_t u; |
| 267 | |
| 268 | if (writeauth(wrfd, authreq, strlen(authreq))) |
| 269 | { |
| 270 | return (1); |
| 271 | } |
| 272 | |
| 273 | readauth(rdfd, buf, sizeof(buf), "\n.\n"); |
| 274 | memset(&a, 0, sizeof(a)); |
| 275 | a.homedir=""; |
| 276 | p=buf; |
| 277 | while (*p) |
| 278 | { |
| 279 | for (q=p; *q; q++) |
| 280 | if (*q == '\n') |
| 281 | { |
| 282 | *q++=0; |
| 283 | break; |
| 284 | } |
| 285 | if (strcmp(p, ".") == 0) |
| 286 | { |
| 287 | return ( (*func)(&a, arg)); |
| 288 | } |
| 289 | if (strcmp(p, "FAIL") == 0) |
| 290 | { |
| 291 | errno=EPERM; |
| 292 | return (-1); |
| 293 | } |
| 294 | r=strchr(p, '='); |
| 295 | if (!r) |
| 296 | { |
| 297 | p=q; |
| 298 | continue; |
| 299 | } |
| 300 | *r++=0; |
| 301 | |
| 302 | if (strcmp(p, "USERNAME") == 0) |
| 303 | a.sysusername=r; |
| 304 | else if (strcmp(p, "UID") == 0) |
| 305 | { |
| 306 | u=atol(r); |
| 307 | a.sysuserid= &u; |
| 308 | } |
| 309 | else if (strcmp(p, "GID") == 0) |
| 310 | { |
| 311 | a.sysgroupid=atol(r); |
| 312 | } |
| 313 | else if (strcmp(p, "HOME") == 0) |
| 314 | { |
| 315 | a.homedir=r; |
| 316 | } |
| 317 | else if (strcmp(p, "ADDRESS") == 0) |
| 318 | { |
| 319 | a.address=r; |
| 320 | } |
| 321 | else if (strcmp(p, "NAME") == 0) |
| 322 | { |
| 323 | a.fullname=r; |
| 324 | } |
| 325 | else if (strcmp(p, "MAILDIR") == 0) |
| 326 | { |
| 327 | a.maildir=r; |
| 328 | } |
| 329 | else if (strcmp(p, "QUOTA") == 0) |
| 330 | { |
| 331 | a.quota=r; |
| 332 | } |
| 333 | else if (strcmp(p, "PASSWD") == 0) |
| 334 | { |
| 335 | a.passwd=r; |
| 336 | } |
| 337 | else if (strcmp(p, "PASSWD2") == 0) |
| 338 | { |
| 339 | a.clearpasswd=r; |
| 340 | } |
| 341 | else if (strcmp(p, "OPTIONS") == 0) |
| 342 | { |
| 343 | a.options=r; |
| 344 | } |
| 345 | p=q; |
| 346 | } |
| 347 | errno=EIO; |
| 348 | return (1); |
| 349 | } |
| 350 | |
| 351 | int authdaemondo(const char *authreq, |
| 352 | int (*func)(struct authinfo *, void *), void *arg) |
| 353 | { |
| 354 | int s=opensock(); |
| 355 | int rc; |
| 356 | |
| 357 | if (s < 0) |
| 358 | { |
| 359 | return (1); |
| 360 | } |
| 361 | rc = _authdaemondo(s, s, authreq, func, arg); |
| 362 | close(s); |
| 363 | return rc; |
| 364 | } |
| 365 | |
| 366 | void auth_daemon_cleanup() |
| 367 | { |
| 368 | } |
| 369 | |
| 370 | struct enum_getch { |
| 371 | char buffer[BUFSIZ]; |
| 372 | char *buf_ptr; |
| 373 | size_t buf_left; |
| 374 | }; |
| 375 | |
| 376 | #define getauthc(fd,eg) ((eg)->buf_left-- ? \ |
| 377 | (unsigned char)*((eg)->buf_ptr)++:\ |
| 378 | fillgetauthc((fd),(eg))) |
| 379 | |
| 380 | static int fillgetauthc(int fd, struct enum_getch *eg) |
| 381 | { |
| 382 | time_t end_time, curtime; |
| 383 | |
| 384 | time(&end_time); |
| 385 | end_time += 60; |
| 386 | |
| 387 | for (;;) |
| 388 | { |
| 389 | int n; |
| 390 | fd_set fds; |
| 391 | struct timeval tv; |
| 392 | |
| 393 | time(&curtime); |
| 394 | if (curtime >= end_time) |
| 395 | break; |
| 396 | |
| 397 | FD_ZERO(&fds); |
| 398 | FD_SET(fd, &fds); |
| 399 | tv.tv_sec=end_time - curtime; |
| 400 | tv.tv_usec=0; |
| 401 | if (select(fd+1, &fds, 0, 0, &tv) <= 0 || !FD_ISSET(fd, &fds)) |
| 402 | break; |
| 403 | |
| 404 | n=read(fd, eg->buffer, sizeof(eg->buffer)); |
| 405 | if (n <= 0) |
| 406 | break; |
| 407 | |
| 408 | eg->buf_ptr=eg->buffer; |
| 409 | eg->buf_left=n; |
| 410 | |
| 411 | --eg->buf_left; |
| 412 | return (unsigned char)*(eg->buf_ptr)++; |
| 413 | } |
| 414 | return EOF; |
| 415 | } |
| 416 | |
| 417 | static int readline(int fd, struct enum_getch *eg, |
| 418 | char *buf, |
| 419 | size_t bufsize) |
| 420 | { |
| 421 | if (bufsize == 0) |
| 422 | return EOF; |
| 423 | |
| 424 | while (--bufsize) |
| 425 | { |
| 426 | int ch=getauthc(fd, eg); |
| 427 | |
| 428 | if (ch == EOF) |
| 429 | return -1; |
| 430 | if (ch == '\n') |
| 431 | break; |
| 432 | |
| 433 | *buf++=ch; |
| 434 | } |
| 435 | *buf=0; |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | int _auth_enumerate(int wrfd, int rdfd, |
| 440 | void(*cb_func)(const char *name, |
| 441 | uid_t uid, |
| 442 | gid_t gid, |
| 443 | const char *homedir, |
| 444 | const char *maildir, |
| 445 | const char *options, |
| 446 | void *void_arg), |
| 447 | void *void_arg) |
| 448 | { |
| 449 | static char cmd[]="ENUMERATE\n"; |
| 450 | struct enum_getch eg; |
| 451 | char linebuf[BUFSIZ]; |
| 452 | |
| 453 | if (writeauth(wrfd, cmd, sizeof(cmd)-1)) |
| 454 | { |
| 455 | return 1; |
| 456 | } |
| 457 | |
| 458 | eg.buf_left=0; |
| 459 | |
| 460 | while (readline(rdfd, &eg, linebuf, sizeof(linebuf)) == 0) |
| 461 | { |
| 462 | char *p; |
| 463 | const char *name; |
| 464 | uid_t uid; |
| 465 | gid_t gid; |
| 466 | const char *homedir; |
| 467 | const char *maildir; |
| 468 | const char *options; |
| 469 | |
| 470 | if (strcmp(linebuf, ".") == 0) |
| 471 | { |
| 472 | (*cb_func)(NULL, 0, 0, NULL, NULL, NULL, void_arg); |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | p=strchr(linebuf, '#'); |
| 477 | if (p) *p=0; |
| 478 | |
| 479 | p=strchr(linebuf, '\t'); |
| 480 | |
| 481 | if (p) |
| 482 | { |
| 483 | name=linebuf; |
| 484 | *p++=0; |
| 485 | |
| 486 | uid=libmail_atouid_t(p); |
| 487 | p=strchr(p, '\t'); |
| 488 | if (uid && p) |
| 489 | { |
| 490 | *p++=0; |
| 491 | gid=libmail_atogid_t(p); |
| 492 | p=strchr(p, '\t'); |
| 493 | if (gid && p) |
| 494 | { |
| 495 | *p++=0; |
| 496 | homedir=p; |
| 497 | p=strchr(p, '\t'); |
| 498 | maildir=NULL; |
| 499 | options=NULL; |
| 500 | |
| 501 | if (p) |
| 502 | { |
| 503 | *p++=0; |
| 504 | maildir=p; |
| 505 | p=strchr(p, '\t'); |
| 506 | |
| 507 | if (p) |
| 508 | { |
| 509 | *p++=0; |
| 510 | options=p; |
| 511 | p=strchr(p, '\t'); |
| 512 | if (p) *p=0; |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | |
| 517 | (*cb_func)(name, uid, gid, homedir, |
| 518 | maildir, options, void_arg); |
| 519 | } |
| 520 | } |
| 521 | } |
| 522 | } |
| 523 | return 1; |
| 524 | } |
| 525 | |
| 526 | void auth_enumerate( void(*cb_func)(const char *name, |
| 527 | uid_t uid, |
| 528 | gid_t gid, |
| 529 | const char *homedir, |
| 530 | const char *maildir, |
| 531 | const char *options, |
| 532 | void *void_arg), |
| 533 | void *void_arg) |
| 534 | { |
| 535 | int s=opensock(); |
| 536 | |
| 537 | if (s < 0) |
| 538 | return; |
| 539 | |
| 540 | _auth_enumerate(s, s, cb_func, void_arg); |
| 541 | |
| 542 | close(s); |
| 543 | } |