Annotation of src/usr.bin/sudo/logging.c, Revision 1.5
1.1 millert 1: /*
1.5 ! millert 2: * Copyright (c) 1994-1996,1998-2001 Todd C. Miller <Todd.Miller@courtesan.com>
1.1 millert 3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: *
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: *
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * 3. The name of the author may not be used to endorse or promote products
17: * derived from this software without specific prior written permission.
18: *
19: * 4. Products derived from this software may not be called "Sudo" nor
20: * may "Sudo" appear in their names without specific prior written
21: * permission from the author.
22: *
23: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
24: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
25: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
26: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33: */
34:
35: #include "config.h"
36:
1.5 ! millert 37: #include <sys/types.h>
! 38: #include <sys/param.h>
! 39: #include <sys/stat.h>
! 40: #include <sys/wait.h>
1.1 millert 41: #include <stdio.h>
42: #ifdef STDC_HEADERS
1.5 ! millert 43: # include <stdlib.h>
! 44: # include <stddef.h>
! 45: #else
! 46: # ifdef HAVE_STDLIB_H
! 47: # include <stdlib.h>
! 48: # endif
1.1 millert 49: #endif /* STDC_HEADERS */
1.5 ! millert 50: #ifdef HAVE_STRING_H
! 51: # include <string.h>
! 52: #else
! 53: # ifdef HAVE_STRINGS_H
! 54: # include <strings.h>
! 55: # endif
! 56: #endif /* HAVE_STRING_H */
1.1 millert 57: #ifdef HAVE_UNISTD_H
1.5 ! millert 58: # include <unistd.h>
1.1 millert 59: #endif /* HAVE_UNISTD_H */
60: #include <pwd.h>
61: #include <signal.h>
62: #include <time.h>
63: #include <errno.h>
64:
65: #include "sudo.h"
66:
67: #ifndef lint
1.5 ! millert 68: static const char rcsid[] = "$Sudo: logging.c,v 1.151 2001/12/14 23:33:38 millert Exp $";
1.1 millert 69: #endif /* lint */
70:
71: static void do_syslog __P((int, char *));
72: static void do_logfile __P((char *));
73: static void send_mail __P((char *));
74: static void mail_auth __P((int, char *));
75: static char *get_timestr __P((void));
1.5 ! millert 76: static void mysyslog __P((int, const char *, ...));
1.1 millert 77:
1.5 ! millert 78: #define MAXSYSLOGTRIES 16 /* num of retries for broken syslogs */
1.1 millert 79:
80: /*
1.5 ! millert 81: * We do an openlog(3)/closelog(3) for each message because some
! 82: * authentication methods (notably PAM) use syslog(3) for their
! 83: * own nefarious purposes and may call openlog(3) and closelog(3).
! 84: * Note that because we don't want to assume that all systems have
! 85: * vsyslog(3) (HP-UX doesn't) "%m" will not be expanded.
! 86: * Sadly this is a maze of #ifdefs.
1.1 millert 87: */
88: static void
1.5 ! millert 89: #ifdef __STDC__
! 90: mysyslog(int pri, const char *fmt, ...)
! 91: #else
! 92: mysyslog(pri, fmt, va_alist)
1.1 millert 93: int pri;
94: const char *fmt;
1.5 ! millert 95: va_dcl
! 96: #endif
1.1 millert 97: {
1.5 ! millert 98: #ifdef BROKEN_SYSLOG
1.1 millert 99: int i;
1.5 ! millert 100: #endif
! 101: char buf[MAXSYSLOGLEN+1];
! 102: va_list ap;
1.1 millert 103:
1.5 ! millert 104: #ifdef __STDC__
! 105: va_start(ap, fmt);
! 106: #else
! 107: va_start(ap);
! 108: #endif
! 109: #ifdef LOG_NFACILITIES
! 110: openlog(Argv[0], 0, def_ival(I_LOGFAC));
! 111: #else
! 112: openlog(Argv[0], 0);
! 113: #endif
! 114: vsnprintf(buf, sizeof(buf), fmt, ap);
! 115: #ifdef BROKEN_SYSLOG
! 116: /*
! 117: * Some versions of syslog(3) don't guarantee success and return
! 118: * an int (notably HP-UX < 10.0). So, if at first we don't succeed,
! 119: * try, try again...
! 120: */
1.1 millert 121: for (i = 0; i < MAXSYSLOGTRIES; i++)
1.5 ! millert 122: if (syslog(pri, "%s", buf) == 0)
1.1 millert 123: break;
124: #else
1.5 ! millert 125: syslog(pri, "%s", buf);
1.1 millert 126: #endif /* BROKEN_SYSLOG */
1.5 ! millert 127: va_end(ap);
! 128: closelog();
! 129: }
1.1 millert 130:
131: /*
132: * Log a message to syslog, pre-pending the username and splitting the
133: * message into parts if it is longer than MAXSYSLOGLEN.
134: */
135: static void
136: do_syslog(pri, msg)
137: int pri;
138: char *msg;
139: {
140: int count;
141: char *p;
142: char *tmp;
143: char save;
144:
145: /*
146: * Log the full line, breaking into multiple syslog(3) calls if necessary
147: */
1.3 millert 148: for (p = msg, count = 0; *p && count < strlen(msg) / MAXSYSLOGLEN + 1;
149: count++) {
1.1 millert 150: if (strlen(p) > MAXSYSLOGLEN) {
151: /*
152: * Break up the line into what will fit on one syslog(3) line
153: * Try to break on a word boundary if possible.
154: */
155: for (tmp = p + MAXSYSLOGLEN; tmp > p && *tmp != ' '; tmp--)
156: ;
157: if (tmp <= p)
158: tmp = p + MAXSYSLOGLEN;
159:
160: /* NULL terminate line, but save the char to restore later */
161: save = *tmp;
162: *tmp = '\0';
163:
164: if (count == 0)
1.5 ! millert 165: mysyslog(pri, "%8.8s : %s", user_name, p);
1.1 millert 166: else
1.5 ! millert 167: mysyslog(pri, "%8.8s : (command continued) %s", user_name, p);
1.1 millert 168:
169: *tmp = save; /* restore saved character */
170:
171: /* Eliminate leading whitespace */
1.3 millert 172: for (p = tmp; *p != ' ' && *p !='\0'; p++)
1.1 millert 173: ;
174: } else {
175: if (count == 0)
1.5 ! millert 176: mysyslog(pri, "%8.8s : %s", user_name, p);
1.1 millert 177: else
1.5 ! millert 178: mysyslog(pri, "%8.8s : (command continued) %s", user_name, p);
1.1 millert 179: }
180: }
181: }
182:
183: static void
184: do_logfile(msg)
185: char *msg;
186: {
187: char *full_line;
188: char *beg, *oldend, *end;
189: FILE *fp;
190: mode_t oldmask;
1.5 ! millert 191: int maxlen = def_ival(I_LOGLINELEN);
1.1 millert 192:
193: oldmask = umask(077);
194: fp = fopen(def_str(I_LOGFILE), "a");
195: (void) umask(oldmask);
196: if (fp == NULL) {
197: easprintf(&full_line, "Can't open log file: %s: %s",
198: def_str(I_LOGFILE), strerror(errno));
199: send_mail(full_line);
200: free(full_line);
201: } else if (!lock_file(fileno(fp), SUDO_LOCK)) {
202: easprintf(&full_line, "Can't lock log file: %s: %s",
203: def_str(I_LOGFILE), strerror(errno));
204: send_mail(full_line);
205: free(full_line);
206: } else {
1.5 ! millert 207: if (def_ival(I_LOGLINELEN) == 0) {
1.1 millert 208: /* Don't pretty-print long log file lines (hard to grep) */
209: if (def_flag(I_LOG_HOST))
210: (void) fprintf(fp, "%s : %s : HOST=%s : %s\n", get_timestr(),
211: user_name, user_shost, msg);
212: else
213: (void) fprintf(fp, "%s : %s : %s\n", get_timestr(),
214: user_name, msg);
215: } else {
216: if (def_flag(I_LOG_HOST))
217: easprintf(&full_line, "%s : %s : HOST=%s : %s", get_timestr(),
218: user_name, user_shost, msg);
219: else
220: easprintf(&full_line, "%s : %s : %s", get_timestr(),
221: user_name, msg);
222:
223: /*
224: * Print out full_line with word wrap
225: */
226: beg = end = full_line;
227: while (beg) {
228: oldend = end;
229: end = strchr(oldend, ' ');
230:
231: if (maxlen > 0 && end) {
232: *end = '\0';
233: if (strlen(beg) > maxlen) {
234: /* too far, need to back up & print the line */
235:
236: if (beg == (char *)full_line)
237: maxlen -= 4; /* don't indent first line */
238:
239: *end = ' ';
240: if (oldend != beg) {
241: /* rewind & print */
242: end = oldend-1;
243: while (*end == ' ')
244: --end;
245: *(++end) = '\0';
246: (void) fprintf(fp, "%s\n ", beg);
247: *end = ' ';
248: } else {
249: (void) fprintf(fp, "%s\n ", beg);
250: }
251:
252: /* reset beg to point to the start of the new substr */
253: beg = end;
254: while (*beg == ' ')
255: ++beg;
256: } else {
257: /* we still have room */
258: *end = ' ';
259: }
260:
261: /* remove leading whitespace */
262: while (*end == ' ')
263: ++end;
264: } else {
265: /* final line */
266: (void) fprintf(fp, "%s\n", beg);
267: beg = NULL; /* exit condition */
268: }
269: }
270: free(full_line);
271: }
272: (void) fflush(fp);
273: (void) lock_file(fileno(fp), SUDO_UNLOCK);
274: (void) fclose(fp);
275: }
276: }
277:
278: /*
279: * Two main functions, log_error() to log errors and log_auth() to
280: * log allow/deny messages.
281: */
282: void
283: log_auth(status, inform_user)
284: int status;
285: int inform_user;
286: {
287: char *message;
288: char *logline;
289: int pri;
290:
291: if (status & VALIDATE_OK)
292: pri = def_ival(I_GOODPRI);
293: else
294: pri = def_ival(I_BADPRI);
295:
296: /* Set error message, if any. */
297: if (status & VALIDATE_OK)
298: message = "";
299: else if (status & FLAG_NO_USER)
300: message = "user NOT in sudoers ; ";
301: else if (status & FLAG_NO_HOST)
302: message = "user NOT authorized on host ; ";
303: else if (status & VALIDATE_NOT_OK)
304: message = "command not allowed ; ";
305: else
306: message = "unknown error ; ";
307:
308: easprintf(&logline, "%sTTY=%s ; PWD=%s ; USER=%s ; COMMAND=%s%s%s",
309: message, user_tty, user_cwd, *user_runas, user_cmnd,
310: user_args ? " " : "", user_args ? user_args : "");
311:
312: mail_auth(status, logline); /* send mail based on status */
313:
314: /* Inform the user if they failed to authenticate. */
315: if (inform_user && (status & VALIDATE_NOT_OK)) {
316: if (status & FLAG_NO_USER)
317: (void) fprintf(stderr, "%s is not in the sudoers file. %s",
318: user_name, "This incident will be reported.\n");
319: else if (status & FLAG_NO_HOST)
320: (void) fprintf(stderr, "%s is not allowed to run sudo on %s. %s",
321: user_name, user_shost, "This incident will be reported.\n");
322: else if (status & FLAG_NO_CHECK)
323: (void) fprintf(stderr, "Sorry, user %s may not run sudo on %s.\n",
324: user_name, user_shost);
325: else
326: (void) fprintf(stderr,
327: "Sorry, user %s is not allowed to execute '%s%s%s' as %s on %s.\n",
328: user_name, user_cmnd, user_args ? " " : "",
329: user_args ? user_args : "", *user_runas, user_host);
330: }
331:
332: /*
333: * Log via syslog and/or a file.
334: */
1.5 ! millert 335: if (def_str(I_SYSLOG))
1.1 millert 336: do_syslog(pri, logline);
337: if (def_str(I_LOGFILE))
338: do_logfile(logline);
339:
340: free(logline);
341: }
342:
343: void
344: #ifdef __STDC__
345: log_error(int flags, const char *fmt, ...)
346: #else
347: log_error(va_alist)
348: va_dcl
349: #endif
350: {
351: int serrno = errno;
352: char *message;
353: char *logline;
354: va_list ap;
355: #ifdef __STDC__
356: va_start(ap, fmt);
357: #else
358: int flags;
359: const char *fmt;
360:
361: va_start(ap);
362: flags = va_arg(ap, int);
363: fmt = va_arg(ap, const char *);
364: #endif
365:
366: /* Become root if we are not already to avoid user control */
367: if (geteuid() != 0)
368: set_perms(PERM_ROOT, 0);
369:
370: /* Expand printf-style format + args. */
371: evasprintf(&message, fmt, ap);
372: va_end(ap);
373:
374: if (flags & MSG_ONLY)
375: logline = message;
376: else if (flags & USE_ERRNO) {
377: if (user_args) {
378: easprintf(&logline,
379: "%s: %s ; TTY=%s ; PWD=%s ; USER=%s ; COMMAND=%s %s",
380: message, strerror(serrno), user_tty, user_cwd, *user_runas,
381: user_cmnd, user_args);
382: } else {
383: easprintf(&logline,
384: "%s: %s ; TTY=%s ; PWD=%s ; USER=%s ; COMMAND=%s", message,
385: strerror(serrno), user_tty, user_cwd, *user_runas, user_cmnd);
386: }
387: } else {
388: if (user_args) {
389: easprintf(&logline,
390: "%s ; TTY=%s ; PWD=%s ; USER=%s ; COMMAND=%s %s", message,
391: user_tty, user_cwd, *user_runas, user_cmnd, user_args);
392: } else {
393: easprintf(&logline,
394: "%s ; TTY=%s ; PWD=%s ; USER=%s ; COMMAND=%s", message,
395: user_tty, user_cwd, *user_runas, user_cmnd);
396: }
397: }
398:
399: /*
400: * Tell the user.
401: */
402: (void) fprintf(stderr, "%s: %s", Argv[0], message);
403: if (flags & USE_ERRNO)
404: (void) fprintf(stderr, ": %s", strerror(serrno));
405: (void) fputc('\n', stderr);
406:
407: /*
408: * Send a copy of the error via mail.
409: */
410: if (!(flags & NO_MAIL))
411: send_mail(logline);
412:
413: /*
414: * Log to syslog and/or a file.
415: */
1.5 ! millert 416: if (def_str(I_SYSLOG))
1.1 millert 417: do_syslog(def_ival(I_BADPRI), logline);
418: if (def_str(I_LOGFILE))
419: do_logfile(logline);
420:
1.5 ! millert 421: free(message);
! 422: if (logline != message)
! 423: free(logline);
1.1 millert 424:
425: if (!(flags & NO_EXIT))
426: exit(1);
427: }
428:
429: #define MAX_MAILFLAGS 63
430:
431: /*
432: * Send a message to MAILTO user
433: */
434: static void
435: send_mail(line)
436: char *line;
437: {
438: FILE *mail;
439: char *p;
1.2 millert 440: int pfd[2], pid, status;
441: sigset_t set, oset;
1.1 millert 442:
443: /* Just return if mailer is disabled. */
444: if (!def_str(I_MAILERPATH) || !def_str(I_MAILTO))
445: return;
446:
1.2 millert 447: (void) sigemptyset(&set);
448: (void) sigaddset(&set, SIGCHLD);
449: (void) sigprocmask(SIG_BLOCK, &set, &oset);
1.1 millert 450:
1.2 millert 451: if (pipe(pfd) == -1) {
452: (void) fprintf(stderr, "%s: cannot open pipe: %s\n",
453: Argv[0], strerror(errno));
454: exit(1);
455: }
1.1 millert 456:
1.2 millert 457: switch (pid = fork()) {
458: case -1:
459: /* Error. */
460: (void) fprintf(stderr, "%s: cannot fork: %s\n",
1.1 millert 461: Argv[0], strerror(errno));
462: exit(1);
1.2 millert 463: break;
464: case 0:
465: {
466: char *argv[MAX_MAILFLAGS + 1];
467: char *mpath, *mflags;
468: int i;
469:
1.5 ! millert 470: /* Child, set stdin to output side of the pipe */
! 471: if (pfd[0] != STDIN_FILENO) {
! 472: (void) dup2(pfd[0], STDIN_FILENO);
! 473: (void) close(pfd[0]);
! 474: }
1.2 millert 475: (void) close(pfd[1]);
476:
477: /* Build up an argv based the mailer path and flags */
478: mflags = estrdup(def_str(I_MAILERFLAGS));
479: mpath = estrdup(def_str(I_MAILERPATH));
480: if ((argv[0] = strrchr(mpath, ' ')))
481: argv[0]++;
482: else
483: argv[0] = mpath;
484:
485: i = 1;
486: if ((p = strtok(mflags, " \t"))) {
487: do {
488: argv[i] = p;
489: } while (++i < MAX_MAILFLAGS && (p = strtok(NULL, " \t")));
490: }
491: argv[i] = NULL;
1.1 millert 492:
1.5 ! millert 493: /* Close password file so we don't leak the fd. */
! 494: endpwent();
! 495:
1.2 millert 496: /* Run mailer as root so user cannot kill it. */
497: set_perms(PERM_ROOT, 0);
498: execv(mpath, argv);
499: _exit(127);
500: }
501: break;
502: }
1.1 millert 503:
1.5 ! millert 504: (void) close(pfd[0]);
1.2 millert 505: mail = fdopen(pfd[1], "w");
1.1 millert 506:
1.2 millert 507: /* Pipes are all setup, send message via sendmail. */
508: (void) fprintf(mail, "To: %s\nFrom: %s\nSubject: ",
509: def_str(I_MAILTO), user_name);
510: for (p = def_str(I_MAILSUB); *p; p++) {
511: /* Expand escapes in the subject */
512: if (*p == '%' && *(p+1) != '%') {
513: switch (*(++p)) {
514: case 'h':
515: (void) fputs(user_host, mail);
516: break;
517: case 'u':
518: (void) fputs(user_name, mail);
519: break;
520: default:
521: p--;
522: break;
523: }
524: } else
525: (void) fputc(*p, mail);
526: }
527: (void) fprintf(mail, "\n\n%s : %s : %s : %s\n\n", user_host,
528: get_timestr(), user_name, line);
529: fclose(mail);
1.1 millert 530:
1.2 millert 531: /* If mailer is done, wait for it now. If not reapchild will get it. */
532: #ifdef sudo_waitpid
533: (void) sudo_waitpid(pid, &status, WNOHANG);
534: #endif
535: (void) sigprocmask(SIG_SETMASK, &oset, NULL);
1.1 millert 536: }
537:
538: /*
539: * Send mail based on the value of "status" and compile-time options.
540: */
541: static void
542: mail_auth(status, line)
543: int status;
544: char *line;
545: {
546: int mail_mask;
547:
548: /* If any of these bits are set in status, we send mail. */
549: if (def_flag(I_MAIL_ALWAYS))
550: mail_mask =
551: VALIDATE_ERROR|VALIDATE_OK|FLAG_NO_USER|FLAG_NO_HOST|VALIDATE_NOT_OK;
552: else {
553: mail_mask = VALIDATE_ERROR;
1.5 ! millert 554: if (def_flag(I_MAIL_NO_USER))
1.1 millert 555: mail_mask |= FLAG_NO_USER;
1.5 ! millert 556: if (def_flag(I_MAIL_NO_HOST))
1.1 millert 557: mail_mask |= FLAG_NO_HOST;
1.5 ! millert 558: if (def_flag(I_MAIL_NO_PERMS))
1.1 millert 559: mail_mask |= VALIDATE_NOT_OK;
560: }
561:
562: if ((status & mail_mask) != 0)
563: send_mail(line);
564: }
565:
566: /*
567: * SIGCHLD sig handler--wait for children as they die.
568: */
569: RETSIGTYPE
570: reapchild(sig)
571: int sig;
572: {
573: int status, serrno = errno;
574:
575: #ifdef sudo_waitpid
1.2 millert 576: while (sudo_waitpid(-1, &status, WNOHANG) != -1 && errno == EINTR)
1.1 millert 577: ;
578: #else
579: (void) wait(&status);
580: #endif
581: errno = serrno;
582: }
583:
584: /*
585: * Return an ascii string with the current date + time
586: * Uses strftime() if available, else falls back to ctime().
587: */
588: static char *
589: get_timestr()
590: {
591: char *s;
592: time_t now = time((time_t) 0);
593: #ifdef HAVE_STRFTIME
594: static char buf[128];
595: struct tm *timeptr;
596:
597: timeptr = localtime(&now);
598: if (def_flag(I_LOG_YEAR))
599: s = "%h %e %T %Y";
600: else
601: s = "%h %e %T";
602:
603: /* strftime() does not guarantee to NUL-terminate so we must check. */
604: buf[sizeof(buf) - 1] = '\0';
605: if (strftime(buf, sizeof(buf), s, timeptr) && buf[sizeof(buf) - 1] == '\0')
606: return(buf);
607:
608: #endif /* HAVE_STRFTIME */
609:
610: s = ctime(&now) + 4; /* skip day of the week */
611: if (def_flag(I_LOG_YEAR))
612: s[20] = '\0'; /* avoid the newline */
613: else
614: s[15] = '\0'; /* don't care about year */
615:
616: return(s);
617: }
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