1/* 2 * Copyright (c) 1994-1996, 1998-2012 Todd C. Miller <Todd.Miller@courtesan.com> 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 * 16 * Sponsored in part by the Defense Advanced Research Projects 17 * Agency (DARPA) and Air Force Research Laboratory, Air Force 18 * Materiel Command, USAF, under agreement number F39502-99-1-0512. 19 */ 20 21#ifdef __TANDEM 22# include <floss.h> 23#endif 24 25#include <config.h> 26 27#include <sys/types.h> 28#include <sys/param.h> 29#include <sys/stat.h> 30#include <sys/ioctl.h> 31#include <sys/wait.h> 32#include <stdio.h> 33#ifdef STDC_HEADERS 34# include <stdlib.h> 35# include <stddef.h> 36#else 37# ifdef HAVE_STDLIB_H 38# include <stdlib.h> 39# endif 40#endif /* STDC_HEADERS */ 41#ifdef HAVE_STRING_H 42# include <string.h> 43#endif /* HAVE_STRING_H */ 44#ifdef HAVE_STRINGS_H 45# include <strings.h> 46#endif /* HAVE_STRINGS_H */ 47#ifdef HAVE_UNISTD_H 48# include <unistd.h> 49#endif /* HAVE_UNISTD_H */ 50#ifdef HAVE_SETLOCALE 51# include <locale.h> 52#endif /* HAVE_SETLOCALE */ 53#ifdef HAVE_NL_LANGINFO 54# include <langinfo.h> 55#endif /* HAVE_NL_LANGINFO */ 56#include <pwd.h> 57#include <grp.h> 58#include <signal.h> 59#include <time.h> 60#include <errno.h> 61#include <fcntl.h> 62 63#include "sudo.h" 64 65static void do_syslog __P((int, char *)); 66static void do_logfile __P((char *)); 67static void send_mail __P((const char *fmt, ...)); 68static int should_mail __P((int)); 69static void mysyslog __P((int, const char *, ...)); 70static char *new_logline __P((const char *, int)); 71 72extern char **NewArgv; /* XXX - for auditing */ 73 74#define MAXSYSLOGTRIES 16 /* num of retries for broken syslogs */ 75 76/* 77 * We do an openlog(3)/closelog(3) for each message because some 78 * authentication methods (notably PAM) use syslog(3) for their 79 * own nefarious purposes and may call openlog(3) and closelog(3). 80 * Note that because we don't want to assume that all systems have 81 * vsyslog(3) (HP-UX doesn't) "%m" will not be expanded. 82 * Sadly this is a maze of #ifdefs. 83 */ 84static void 85#ifdef __STDC__ 86mysyslog(int pri, const char *fmt, ...) 87#else 88mysyslog(pri, fmt, va_alist) 89 int pri; 90 const char *fmt; 91 va_dcl 92#endif 93{ 94#ifdef BROKEN_SYSLOG 95 int i; 96#endif 97 char buf[MAXSYSLOGLEN+1]; 98 va_list ap; 99 100#ifdef __STDC__ 101 va_start(ap, fmt); 102#else 103 va_start(ap); 104#endif 105#ifdef LOG_NFACILITIES 106 openlog("sudo", 0, def_syslog); 107#else 108 openlog("sudo", 0); 109#endif 110 vsnprintf(buf, sizeof(buf), fmt, ap); 111#ifdef BROKEN_SYSLOG 112 /* 113 * Some versions of syslog(3) don't guarantee success and return 114 * an int (notably HP-UX < 10.0). So, if at first we don't succeed, 115 * try, try again... 116 */ 117 for (i = 0; i < MAXSYSLOGTRIES; i++) 118 if (syslog(pri, "%s", buf) == 0) 119 break; 120#else 121 syslog(pri, "%s", buf); 122#endif /* BROKEN_SYSLOG */ 123 va_end(ap); 124 closelog(); 125} 126 127#define FMT_FIRST "%8s : %s" 128#define FMT_CONTD "%8s : (command continued) %s" 129 130/* 131 * Log a message to syslog, pre-pending the username and splitting the 132 * message into parts if it is longer than MAXSYSLOGLEN. 133 */ 134static void 135do_syslog(pri, msg) 136 int pri; 137 char *msg; 138{ 139 size_t len, maxlen; 140 char *p, *tmp, save; 141 const char *fmt; 142 143#ifdef HAVE_SETLOCALE 144 const char *old_locale = estrdup(setlocale(LC_ALL, NULL)); 145 if (!setlocale(LC_ALL, def_sudoers_locale)) 146 setlocale(LC_ALL, "C"); 147#endif /* HAVE_SETLOCALE */ 148 149 /* 150 * Log the full line, breaking into multiple syslog(3) calls if necessary 151 */ 152 fmt = FMT_FIRST; 153 maxlen = MAXSYSLOGLEN - (sizeof(FMT_FIRST) - 6 + strlen(user_name)); 154 for (p = msg; *p != '\0'; ) { 155 len = strlen(p); 156 if (len > maxlen) { 157 /* 158 * Break up the line into what will fit on one syslog(3) line 159 * Try to avoid breaking words into several lines if possible. 160 */ 161 tmp = memrchr(p, ' ', maxlen); 162 if (tmp == NULL) 163 tmp = p + maxlen; 164 165 /* NULL terminate line, but save the char to restore later */ 166 save = *tmp; 167 *tmp = '\0'; 168 169 mysyslog(pri, fmt, user_name, p); 170 171 *tmp = save; /* restore saved character */ 172 173 /* Advance p and eliminate leading whitespace */ 174 for (p = tmp; *p == ' '; p++) 175 ; 176 } else { 177 mysyslog(pri, fmt, user_name, p); 178 p += len; 179 } 180 fmt = FMT_CONTD; 181 maxlen = MAXSYSLOGLEN - (sizeof(FMT_CONTD) - 6 + strlen(user_name)); 182 } 183 184#ifdef HAVE_SETLOCALE 185 setlocale(LC_ALL, old_locale); 186 efree((void *)old_locale); 187#endif /* HAVE_SETLOCALE */ 188} 189 190static void 191do_logfile(msg) 192 char *msg; 193{ 194 char *full_line; 195 size_t len; 196 mode_t oldmask; 197 time_t now; 198 FILE *fp; 199 200 oldmask = umask(077); 201 fp = fopen(def_logfile, "a"); 202 (void) umask(oldmask); 203 if (fp == NULL) { 204 send_mail("Can't open log file: %s: %s", def_logfile, strerror(errno)); 205 } else if (!lock_file(fileno(fp), SUDO_LOCK)) { 206 send_mail("Can't lock log file: %s: %s", def_logfile, strerror(errno)); 207 } else { 208#ifdef HAVE_SETLOCALE 209 const char *old_locale = estrdup(setlocale(LC_ALL, NULL)); 210 if (!setlocale(LC_ALL, def_sudoers_locale)) 211 setlocale(LC_ALL, "C"); 212#endif /* HAVE_SETLOCALE */ 213 214 now = time(NULL); 215 if (def_loglinelen < sizeof(LOG_INDENT)) { 216 /* Don't pretty-print long log file lines (hard to grep) */ 217 if (def_log_host) 218 (void) fprintf(fp, "%s : %s : HOST=%s : %s\n", 219 get_timestr(now, def_log_year), user_name, user_shost, msg); 220 else 221 (void) fprintf(fp, "%s : %s : %s\n", 222 get_timestr(now, def_log_year), user_name, msg); 223 } else { 224 if (def_log_host) 225 len = easprintf(&full_line, "%s : %s : HOST=%s : %s", 226 get_timestr(now, def_log_year), user_name, user_shost, msg); 227 else 228 len = easprintf(&full_line, "%s : %s : %s", 229 get_timestr(now, def_log_year), user_name, msg); 230 231 /* 232 * Print out full_line with word wrap around def_loglinelen chars. 233 */ 234 writeln_wrap(fp, full_line, len, def_loglinelen); 235 efree(full_line); 236 } 237 (void) fflush(fp); 238 (void) lock_file(fileno(fp), SUDO_UNLOCK); 239 (void) fclose(fp); 240 241#ifdef HAVE_SETLOCALE 242 setlocale(LC_ALL, old_locale); 243 efree((void *)old_locale); 244#endif /* HAVE_SETLOCALE */ 245 } 246} 247 248/* 249 * Log, audit and mail the denial message, optionally informing the user. 250 */ 251void 252log_denial(status, inform_user) 253 int status; 254 int inform_user; 255{ 256 char *message; 257 char *logline; 258 259 /* Handle auditing first. */ 260 if (ISSET(status, FLAG_NO_USER | FLAG_NO_HOST)) 261 audit_failure(NewArgv, "No user or host"); 262 else 263 audit_failure(NewArgv, "validation failure"); 264 265 /* Set error message. */ 266 if (ISSET(status, FLAG_NO_USER)) 267 message = "user NOT in sudoers"; 268 else if (ISSET(status, FLAG_NO_HOST)) 269 message = "user NOT authorized on host"; 270 else 271 message = "command not allowed"; 272 273 logline = new_logline(message, 0); 274 275 if (should_mail(status)) 276 send_mail("%s", logline); /* send mail based on status */ 277 278 /* Inform the user if they failed to authenticate. */ 279 if (inform_user) { 280 if (ISSET(status, FLAG_NO_USER)) 281 (void) fprintf(stderr, "%s is not in the sudoers file. %s", 282 user_name, "This incident will be reported.\n"); 283 else if (ISSET(status, FLAG_NO_HOST)) 284 (void) fprintf(stderr, "%s is not allowed to run sudo on %s. %s", 285 user_name, user_shost, "This incident will be reported.\n"); 286 else if (ISSET(status, FLAG_NO_CHECK)) 287 (void) fprintf(stderr, "Sorry, user %s may not run sudo on %s.\n", 288 user_name, user_shost); 289 else 290 (void) fprintf(stderr, 291 "Sorry, user %s is not allowed to execute '%s%s%s' as %s%s%s on %s.\n", 292 user_name, user_cmnd, user_args ? " " : "", 293 user_args ? user_args : "", 294 list_pw ? list_pw->pw_name : runas_pw ? 295 runas_pw->pw_name : user_name, runas_gr ? ":" : "", 296 runas_gr ? runas_gr->gr_name : "", user_host); 297 } 298 299 /* 300 * Log via syslog and/or a file. 301 */ 302 if (def_syslog) 303 do_syslog(def_syslog_badpri, logline); 304 if (def_logfile) 305 do_logfile(logline); 306 307 efree(logline); 308} 309 310/* 311 * Log and audit that user was not allowed to run the command. 312 */ 313void 314log_failure(status, flags) 315 int status; 316 int flags; 317{ 318 int inform_user = TRUE; 319 320 /* The user doesn't always get to see the log message (path info). */ 321 if (!ISSET(status, FLAG_NO_USER | FLAG_NO_HOST) && def_path_info && 322 (flags == NOT_FOUND_DOT || flags == NOT_FOUND)) 323 inform_user = FALSE; 324 log_denial(status, inform_user); 325 326 if (!inform_user) { 327 /* 328 * We'd like to not leak path info at all here, but that can 329 * *really* confuse the users. To really close the leak we'd 330 * have to say "not allowed to run foo" even when the problem 331 * is just "no foo in path" since the user can trivially set 332 * their path to just contain a single dir. 333 */ 334 if (flags == NOT_FOUND) 335 warningx("%s: command not found", user_cmnd); 336 else if (flags == NOT_FOUND_DOT) 337 warningx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd); 338 } 339} 340 341/* 342 * Log and audit that user was not able to authenticate themselves. 343 */ 344void 345log_auth_failure(status, tries) 346 int status; 347 int tries; 348{ 349 int flags = NO_MAIL; 350 351 /* Handle auditing first. */ 352 audit_failure(NewArgv, "authentication failure"); 353 354 /* 355 * Do we need to send mail? 356 * We want to avoid sending multiple messages for the same command 357 * so if we are going to send an email about the denial, that takes 358 * precedence. 359 */ 360 if (ISSET(status, VALIDATE_OK)) { 361 /* Command allowed, auth failed; do we need to send mail? */ 362 if (def_mail_badpass || def_mail_always) 363 flags = 0; 364 } else { 365 /* Command denied, auth failed; make sure we don't send mail twice. */ 366 if (def_mail_badpass && !should_mail(status)) 367 flags = 0; 368 /* Don't log the bad password message, we'll log a denial instead. */ 369 flags |= NO_LOG; 370 } 371 372 /* 373 * If sudoers denied the command we'll log that separately. 374 */ 375 if (ISSET(status, FLAG_BAD_PASSWORD)) { 376 log_error(flags, "%d incorrect password attempt%s", 377 tries, tries == 1 ? "" : "s"); 378 } else if (ISSET(status, FLAG_NON_INTERACTIVE)) { 379 log_error(flags, "a password is required"); 380 } 381} 382 383/* 384 * Log and potentially mail the allowed command. 385 */ 386void 387log_allowed(status) 388 int status; 389{ 390 char *logline; 391 392 logline = new_logline(NULL, 0); 393 394 if (should_mail(status)) 395 send_mail("%s", logline); /* send mail based on status */ 396 397 /* 398 * Log via syslog and/or a file. 399 */ 400 if (def_syslog) 401 do_syslog(def_syslog_goodpri, logline); 402 if (def_logfile) 403 do_logfile(logline); 404 405 efree(logline); 406} 407 408/* 409 * Perform logging for log_error()/log_fatal() 410 */ 411static void 412vlog_error(flags, fmt, ap) 413 int flags; 414 const char *fmt; 415 va_list ap; 416{ 417 int serrno = errno; 418 char *message; 419 char *logline; 420 421 /* Become root if we are not already to avoid user interference */ 422 set_perms(PERM_ROOT|PERM_NOEXIT); 423 424 /* Expand printf-style format + args. */ 425 evasprintf(&message, fmt, ap); 426 427 if (ISSET(flags, MSG_ONLY)) 428 logline = message; 429 else 430 logline = new_logline(message, ISSET(flags, USE_ERRNO) ? serrno : 0); 431 432 /* 433 * Tell the user. 434 */ 435 if (!ISSET(flags, NO_STDERR)) { 436 if (ISSET(flags, USE_ERRNO)) 437 warning("%s", message); 438 else 439 warningx("%s", message); 440 } 441 if (logline != message) 442 efree(message); 443 444 /* 445 * Send a copy of the error via mail. 446 */ 447 if (!ISSET(flags, NO_MAIL)) 448 send_mail("%s", logline); 449 450 /* 451 * Log to syslog and/or a file. 452 */ 453 if (!ISSET(flags, NO_LOG)) { 454 if (def_syslog) 455 do_syslog(def_syslog_badpri, logline); 456 if (def_logfile) 457 do_logfile(logline); 458 } 459 460 efree(logline); 461} 462 463void 464#ifdef __STDC__ 465log_error(int flags, const char *fmt, ...) 466#else 467log_error(flags, fmt, va_alist) 468 int flags; 469 const char *fmt; 470 va_dcl 471#endif 472{ 473 va_list ap; 474 475 /* Log the error. */ 476#ifdef __STDC__ 477 va_start(ap, fmt); 478#else 479 va_start(ap); 480#endif 481 vlog_error(flags, fmt, ap); 482 va_end(ap); 483} 484 485void 486#ifdef __STDC__ 487log_fatal(int flags, const char *fmt, ...) 488#else 489log_fatal(flags, fmt, va_alist) 490 int flags; 491 const char *fmt; 492 va_dcl 493#endif 494{ 495 va_list ap; 496 497 /* Log the error. */ 498#ifdef __STDC__ 499 va_start(ap, fmt); 500#else 501 va_start(ap); 502#endif 503 vlog_error(flags, fmt, ap); 504 va_end(ap); 505 506 /* Clean up and exit. */ 507 cleanup(0); 508 exit(1); 509} 510 511#define MAX_MAILFLAGS 63 512 513/* 514 * Send a message to MAILTO user 515 */ 516static void 517#ifdef __STDC__ 518send_mail(const char *fmt, ...) 519#else 520send_mail(fmt, va_alist) 521 const char *fmt; 522 va_dcl 523#endif 524{ 525 FILE *mail; 526 char *p; 527 int fd, pfd[2], status; 528 pid_t pid, rv; 529 sigaction_t sa; 530 va_list ap; 531#ifndef NO_ROOT_MAILER 532 static char *root_envp[] = { 533 "HOME=/", 534 "PATH=/usr/bin:/bin:/usr/sbin:/sbin", 535 "LOGNAME=root", 536 "USERNAME=root", 537 "USER=root", 538 NULL 539 }; 540#endif /* NO_ROOT_MAILER */ 541 542 /* Just return if mailer is disabled. */ 543 if (!def_mailerpath || !def_mailto) 544 return; 545 546 /* Fork and return, child will daemonize. */ 547 switch (pid = fork()) { 548 case -1: 549 /* Error. */ 550 error(1, "cannot fork"); 551 break; 552 case 0: 553 /* Child. */ 554 switch (pid = fork()) { 555 case -1: 556 /* Error. */ 557 mysyslog(LOG_ERR, "cannot fork: %m"); 558 _exit(1); 559 case 0: 560 /* Grandchild continues below. */ 561 break; 562 default: 563 /* Parent will wait for us. */ 564 _exit(0); 565 } 566 break; 567 default: 568 /* Parent. */ 569 do { 570#ifdef HAVE_WAITPID 571 rv = waitpid(pid, &status, 0); 572#else 573 rv = wait(&status); 574#endif 575 } while (rv == -1 && errno == EINTR); 576 return; 577 } 578 579 /* Daemonize - disassociate from session/tty. */ 580 if (setsid() == -1) 581 warning("setsid"); 582 if (chdir("/") == -1) 583 warning("chdir(/)"); 584 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) { 585 (void) dup2(fd, STDIN_FILENO); 586 (void) dup2(fd, STDOUT_FILENO); 587 (void) dup2(fd, STDERR_FILENO); 588 } 589 590#ifdef HAVE_SETLOCALE 591 if (!setlocale(LC_ALL, def_sudoers_locale)) { 592 setlocale(LC_ALL, "C"); 593 efree(def_sudoers_locale); 594 def_sudoers_locale = estrdup("C"); 595 } 596#endif /* HAVE_SETLOCALE */ 597 598 /* Close password, group and other fds so we don't leak. */ 599 sudo_endpwent(); 600 sudo_endgrent(); 601 closefrom(STDERR_FILENO + 1); 602 603 /* Ignore SIGPIPE in case mailer exits prematurely (or is missing). */ 604 zero_bytes(&sa, sizeof(sa)); 605 sigemptyset(&sa.sa_mask); 606 sa.sa_flags = SA_INTERRUPT; 607 sa.sa_handler = SIG_IGN; 608 (void) sigaction(SIGPIPE, &sa, NULL); 609 610 if (pipe(pfd) == -1) { 611 mysyslog(LOG_ERR, "cannot open pipe: %m"); 612 _exit(1); 613 } 614 615 switch (pid = fork()) { 616 case -1: 617 /* Error. */ 618 mysyslog(LOG_ERR, "cannot fork: %m"); 619 _exit(1); 620 break; 621 case 0: 622 { 623 char *argv[MAX_MAILFLAGS + 1]; 624 char *mpath, *mflags; 625 int i; 626 627 /* Child, set stdin to output side of the pipe */ 628 if (pfd[0] != STDIN_FILENO) { 629 if (dup2(pfd[0], STDIN_FILENO) == -1) { 630 mysyslog(LOG_ERR, "cannot dup stdin: %m"); 631 _exit(127); 632 } 633 (void) close(pfd[0]); 634 } 635 (void) close(pfd[1]); 636 637 /* Build up an argv based on the mailer path and flags */ 638 mflags = estrdup(def_mailerflags); 639 mpath = estrdup(def_mailerpath); 640 if ((argv[0] = strrchr(mpath, ' '))) 641 argv[0]++; 642 else 643 argv[0] = mpath; 644 645 i = 1; 646 if ((p = strtok(mflags, " \t"))) { 647 do { 648 argv[i] = p; 649 } while (++i < MAX_MAILFLAGS && (p = strtok(NULL, " \t"))); 650 } 651 argv[i] = NULL; 652 653 /* 654 * Depending on the config, either run the mailer as root 655 * (so user cannot kill it) or as the user (for the paranoid). 656 */ 657#ifndef NO_ROOT_MAILER 658 set_perms(PERM_ROOT|PERM_NOEXIT); 659 execve(mpath, argv, root_envp); 660#else 661 set_perms(PERM_FULL_USER|PERM_NOEXIT); 662 execv(mpath, argv); 663#endif /* NO_ROOT_MAILER */ 664 mysyslog(LOG_ERR, "cannot execute %s: %m", mpath); 665 _exit(127); 666 } 667 break; 668 } 669 670 (void) close(pfd[0]); 671 mail = fdopen(pfd[1], "w"); 672 673 /* Pipes are all setup, send message. */ 674 (void) fprintf(mail, "To: %s\nFrom: %s\nAuto-Submitted: %s\nSubject: ", 675 def_mailto, def_mailfrom ? def_mailfrom : user_name, "auto-generated"); 676 for (p = def_mailsub; *p; p++) { 677 /* Expand escapes in the subject */ 678 if (*p == '%' && *(p+1) != '%') { 679 switch (*(++p)) { 680 case 'h': 681 (void) fputs(user_host, mail); 682 break; 683 case 'u': 684 (void) fputs(user_name, mail); 685 break; 686 default: 687 p--; 688 break; 689 } 690 } else 691 (void) fputc(*p, mail); 692 } 693 694#ifdef HAVE_NL_LANGINFO 695 if (strcmp(def_sudoers_locale, "C") != 0) 696 (void) fprintf(mail, "\nContent-Type: text/plain; charset=\"%s\"\nContent-Transfer-Encoding: 8bit", nl_langinfo(CODESET)); 697#endif /* HAVE_NL_LANGINFO */ 698 699 (void) fprintf(mail, "\n\n%s : %s : %s : ", user_host, 700 get_timestr(time(NULL), def_log_year), user_name); 701#ifdef __STDC__ 702 va_start(ap, fmt); 703#else 704 va_start(ap); 705#endif 706 (void) vfprintf(mail, fmt, ap); 707 va_end(ap); 708 fputs("\n\n", mail); 709 710 fclose(mail); 711 do { 712#ifdef HAVE_WAITPID 713 rv = waitpid(pid, &status, 0); 714#else 715 rv = wait(&status); 716#endif 717 } while (rv == -1 && errno == EINTR); 718 _exit(0); 719} 720 721/* 722 * Determine whether we should send mail based on "status" and defaults options. 723 */ 724static int 725should_mail(status) 726 int status; 727{ 728 729 return def_mail_always || ISSET(status, VALIDATE_ERROR) || 730 (def_mail_no_user && ISSET(status, FLAG_NO_USER)) || 731 (def_mail_no_host && ISSET(status, FLAG_NO_HOST)) || 732 (def_mail_no_perms && !ISSET(status, VALIDATE_OK)); 733} 734 735#define LL_TTY_STR "TTY=" 736#define LL_CWD_STR "PWD=" /* XXX - should be CWD= */ 737#define LL_USER_STR "USER=" 738#define LL_GROUP_STR "GROUP=" 739#define LL_ENV_STR "ENV=" 740#define LL_CMND_STR "COMMAND=" 741#define LL_TSID_STR "TSID=" 742 743/* 744 * Allocate and fill in a new logline. 745 */ 746static char * 747new_logline(message, serrno) 748 const char *message; 749 int serrno; 750{ 751 size_t len = 0; 752 char *evstr = NULL; 753 char *errstr = NULL; 754 char *line; 755 756 /* 757 * Compute line length 758 */ 759 if (message != NULL) 760 len += strlen(message) + 3; 761 if (serrno) { 762 errstr = strerror(serrno); 763 len += strlen(errstr) + 3; 764 } 765 len += sizeof(LL_TTY_STR) + 2 + strlen(user_tty); 766 len += sizeof(LL_CWD_STR) + 2 + strlen(user_cwd); 767 if (runas_pw != NULL) 768 len += sizeof(LL_USER_STR) + 2 + strlen(runas_pw->pw_name); 769 if (runas_gr != NULL) 770 len += sizeof(LL_GROUP_STR) + 2 + strlen(runas_gr->gr_name); 771 if (sudo_user.sessid[0] != '\0') 772 len += sizeof(LL_TSID_STR) + 2 + strlen(sudo_user.sessid); 773 if (sudo_user.env_vars != NULL) { 774 size_t evlen = 0; 775 struct list_member *cur; 776 for (cur = sudo_user.env_vars; cur != NULL; cur = cur->next) 777 evlen += strlen(cur->value) + 1; 778 evstr = emalloc(evlen); 779 evstr[0] = '\0'; 780 for (cur = sudo_user.env_vars; cur != NULL; cur = cur->next) { 781 strlcat(evstr, cur->value, evlen); 782 strlcat(evstr, " ", evlen); /* NOTE: last one will fail */ 783 } 784 len += sizeof(LL_ENV_STR) + 2 + evlen; 785 } 786 /* Note: we log "sudo -l command arg ..." as "list command arg ..." */ 787 len += sizeof(LL_CMND_STR) - 1 + strlen(user_cmnd); 788 if (ISSET(sudo_mode, MODE_CHECK)) 789 len += sizeof("list ") - 1; 790 if (user_args != NULL) 791 len += strlen(user_args) + 1; 792 793 /* 794 * Allocate and build up the line. 795 */ 796 line = emalloc(++len); 797 line[0] = '\0'; 798 799 if (message != NULL) { 800 if (strlcat(line, message, len) >= len || 801 strlcat(line, errstr ? " : " : " ; ", len) >= len) 802 goto toobig; 803 } 804 if (serrno) { 805 if (strlcat(line, errstr, len) >= len || 806 strlcat(line, " ; ", len) >= len) 807 goto toobig; 808 } 809 if (strlcat(line, LL_TTY_STR, len) >= len || 810 strlcat(line, user_tty, len) >= len || 811 strlcat(line, " ; ", len) >= len) 812 goto toobig; 813 if (strlcat(line, LL_CWD_STR, len) >= len || 814 strlcat(line, user_cwd, len) >= len || 815 strlcat(line, " ; ", len) >= len) 816 goto toobig; 817 if (runas_pw != NULL) { 818 if (strlcat(line, LL_USER_STR, len) >= len || 819 strlcat(line, runas_pw->pw_name, len) >= len || 820 strlcat(line, " ; ", len) >= len) 821 goto toobig; 822 } 823 if (runas_gr != NULL) { 824 if (strlcat(line, LL_GROUP_STR, len) >= len || 825 strlcat(line, runas_gr->gr_name, len) >= len || 826 strlcat(line, " ; ", len) >= len) 827 goto toobig; 828 } 829 if (sudo_user.sessid[0] != '\0') { 830 if (strlcat(line, LL_TSID_STR, len) >= len || 831 strlcat(line, sudo_user.sessid, len) >= len || 832 strlcat(line, " ; ", len) >= len) 833 goto toobig; 834 } 835 if (evstr != NULL) { 836 if (strlcat(line, LL_ENV_STR, len) >= len || 837 strlcat(line, evstr, len) >= len || 838 strlcat(line, " ; ", len) >= len) 839 goto toobig; 840 efree(evstr); 841 } 842 if (strlcat(line, LL_CMND_STR, len) >= len) 843 goto toobig; 844 if (ISSET(sudo_mode, MODE_CHECK) && strlcat(line, "list ", len) >= len) 845 goto toobig; 846 if (strlcat(line, user_cmnd, len) >= len) 847 goto toobig; 848 if (user_args != NULL) { 849 if (strlcat(line, " ", len) >= len || 850 strlcat(line, user_args, len) >= len) 851 goto toobig; 852 } 853 854 return line; 855toobig: 856 errorx(1, "internal error: insufficient space for log line"); 857} 858