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1d7b9b20 | 1 | /* |
2 | * Copyright (c) 2000 Andre Lucas. All rights reserved. | |
564dd50a | 3 | * Portions copyright (c) 1998 Todd C. Miller |
4 | * Portions copyright (c) 1996 Jason Downs | |
5 | * Portions copyright (c) 1996 Theo de Raadt | |
1d7b9b20 | 6 | * |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
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 | * 3. All advertising materials mentioning features or use of this software | |
16 | * must display the following acknowledgement: | |
17 | * This product includes software developed by Markus Friedl. | |
18 | * 4. The name of the author may not be used to endorse or promote products | |
19 | * derived from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
22 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
23 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
24 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
25 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
26 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
30 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
31 | */ | |
32 | ||
33 | /** | |
34 | ** loginrec.c: platform-independent login recording and lastlog retrieval | |
35 | **/ | |
36 | ||
564dd50a | 37 | /* |
38 | The new login code explained | |
39 | ============================ | |
40 | ||
41 | This code attempts to provide a common interface to login recording | |
42 | (utmp and friends) and last login time retrieval. | |
43 | ||
44 | Its primary means of achieving this is to use 'struct logininfo', a | |
45 | union of all the useful fields in the various different types of | |
46 | system login record structures one finds on UNIX variants. | |
47 | ||
48 | We depend on autoconf to define which recording methods are to be | |
49 | used, and which fields are contained in the relevant data structures | |
50 | on the local system. Many C preprocessor symbols affect which code | |
51 | gets compiled here. | |
52 | ||
53 | The code is designed to make it easy to modify a particular | |
54 | recording method, without affecting other methods nor requiring so | |
55 | many nested conditional compilation blocks as were commonplace in | |
56 | the old code. | |
57 | ||
58 | For login recording, we try to use the local system's libraries as | |
59 | these are clearly most likely to work correctly. For utmp systems | |
60 | this usually means login() and logout() or setutent() etc., probably | |
61 | in libutil, along with logwtmp() etc. On these systems, we fall back | |
62 | to writing the files directly if we have to, though this method | |
63 | requires very thorough testing so we do not corrupt local auditing | |
64 | information. These files and their access methods are very system | |
65 | specific indeed. | |
66 | ||
67 | For utmpx systems, the corresponding library functions are | |
68 | setutxent() etc. To the author's knowledge, all utmpx systems have | |
69 | these library functions and so no direct write is attempted. If such | |
70 | a system exists and needs support, direct analogues of the [uw]tmp | |
71 | code should suffice. | |
72 | ||
73 | Retrieving the time of last login ('lastlog') is in some ways even | |
74 | more problemmatic than login recording. Some systems provide a | |
75 | simple table of all users which we seek based on uid and retrieve a | |
76 | relatively standard structure. Others record the same information in | |
77 | a directory with a separate file, and others don't record the | |
78 | information separately at all. For systems in the latter category, | |
79 | we look backwards in the wtmp or wtmpx file for the last login entry | |
80 | for our user. Naturally this is slower and on busy systems could | |
81 | incur a significant performance penalty. | |
82 | ||
83 | Calling the new code | |
84 | -------------------- | |
85 | ||
86 | In OpenSSH all login recording and retrieval is performed in | |
87 | login.c. Here you'll find working examples. Also, in the logintest.c | |
88 | program there are more examples. | |
89 | ||
90 | Internal handler calling method | |
91 | ------------------------------- | |
92 | ||
93 | When a call is made to login_login() or login_logout(), both | |
94 | routines set a struct logininfo flag defining which action (log in, | |
95 | or log out) is to be taken. They both then call login_write(), which | |
96 | calls whichever of the many structure-specific handlers autoconf | |
97 | selects for the local system. | |
98 | ||
99 | The handlers themselves handle system data structure specifics. Both | |
100 | struct utmp and struct utmpx have utility functions (see | |
101 | construct_utmp*()) to try to make it simpler to add extra systems | |
102 | that introduce new features to either structure. | |
103 | ||
104 | While it may seem terribly wasteful to replicate so much similar | |
105 | code for each method, experience has shown that maintaining code to | |
106 | write both struct utmp and utmpx in one function, whilst maintaining | |
107 | support for all systems whether they have library support or not, is | |
108 | a difficult and time-consuming task. | |
109 | ||
110 | Lastlog support proceeds similarly. Functions login_get_lastlog() | |
111 | (and its OpenSSH-tuned friend login_get_lastlog_time()) call | |
112 | getlast_entry(), which tries one of three methods to find the last | |
113 | login time. It uses local system lastlog support if it can, | |
114 | otherwise it tries wtmp or wtmpx before giving up and returning 0, | |
115 | meaning "tilt". | |
116 | ||
117 | Maintenance | |
118 | ----------- | |
119 | ||
120 | In many cases it's possible to tweak autoconf to select the correct | |
121 | methods for a particular platform, either by improving the detection | |
122 | code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE | |
123 | symbols for the platform. | |
124 | ||
125 | Use logintest to check which symbols are defined before modifying | |
126 | configure.in and loginrec.c. (You have to build logintest yourself | |
127 | with 'make logintest' as it's not built by default.) | |
128 | ||
129 | Otherwise, patches to the specific method(s) are very helpful! | |
130 | ||
131 | */ | |
132 | ||
1d7b9b20 | 133 | /** |
134 | ** TODO: | |
564dd50a | 135 | ** homegrown ttyslot()q |
136 | ** test, test, test | |
1d7b9b20 | 137 | ** |
138 | ** Platform status: | |
139 | ** ---------------- | |
140 | ** | |
141 | ** Known good: | |
142 | ** Linux (Redhat 6.2, need more variants) | |
143 | ** HP-UX 10.20 (gcc only) | |
5abcdf8e | 144 | ** IRIX |
1d7b9b20 | 145 | ** |
146 | ** Testing required: Please send reports! | |
147 | ** Solaris | |
1d7b9b20 | 148 | ** NetBSD |
149 | ** HP-UX 11 | |
a3cef3ca | 150 | ** AIX |
1d7b9b20 | 151 | ** |
152 | ** Platforms with known problems: | |
1d7b9b20 | 153 | ** NeXT |
154 | ** | |
155 | **/ | |
156 | ||
157 | #include "includes.h" | |
158 | ||
564dd50a | 159 | #if HAVE_UTMP_H |
160 | # include <utmp.h> | |
161 | #endif | |
162 | #if HAVE_UTMPX_H | |
163 | # include <utmpx.h> | |
164 | #endif | |
165 | #if HAVE_LASTLOG_H | |
166 | # include <lastlog.h> | |
167 | #endif | |
1d7b9b20 | 168 | |
169 | #include "ssh.h" | |
170 | #include "xmalloc.h" | |
171 | #include "loginrec.h" | |
172 | ||
173 | RCSID("$Id$"); | |
174 | ||
1d7b9b20 | 175 | /** |
176 | ** prototypes for helper functions in this file | |
177 | **/ | |
178 | ||
179 | #if HAVE_UTMP_H | |
1d7b9b20 | 180 | void set_utmp_time(struct logininfo *li, struct utmp *ut); |
181 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
182 | #endif | |
183 | ||
184 | #ifdef HAVE_UTMPX_H | |
1d7b9b20 | 185 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); |
186 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
187 | #endif | |
188 | ||
189 | int utmp_write_entry(struct logininfo *li); | |
190 | int utmpx_write_entry(struct logininfo *li); | |
191 | int wtmp_write_entry(struct logininfo *li); | |
192 | int wtmpx_write_entry(struct logininfo *li); | |
193 | int lastlog_write_entry(struct logininfo *li); | |
194 | int syslogin_write_entry(struct logininfo *li); | |
195 | ||
196 | int getlast_entry(struct logininfo *li); | |
197 | int lastlog_get_entry(struct logininfo *li); | |
198 | int wtmp_get_entry(struct logininfo *li); | |
199 | int wtmpx_get_entry(struct logininfo *li); | |
200 | ||
201 | ||
5abcdf8e | 202 | #ifdef MIN |
203 | # undef MIN | |
204 | # define MIN(a,b) ( (a)<(b) ? (a) : (b) ) | |
205 | #endif | |
206 | ||
207 | /* pick the shortest string */ | |
208 | #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) ) | |
209 | ||
210 | ||
1d7b9b20 | 211 | /** |
212 | ** platform-independent login functions | |
213 | **/ | |
214 | ||
5abcdf8e | 215 | /* login_login(struct logininfo *) -Record a login |
216 | * | |
217 | * Call with a pointer to a struct logininfo initialised with | |
218 | * login_init_entry() or login_alloc_entry() | |
219 | * | |
220 | * Returns: | |
221 | * >0 if successful | |
222 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
223 | */ | |
564dd50a | 224 | int |
225 | login_login (struct logininfo *li) | |
226 | { | |
227 | li->type = LTYPE_LOGIN; | |
228 | return login_write(li); | |
229 | } | |
1d7b9b20 | 230 | |
231 | ||
5abcdf8e | 232 | /* login_logout(struct logininfo *) - Record a logout |
233 | * | |
234 | * Call as with login_login() | |
235 | * | |
236 | * Returns: | |
237 | * >0 if successful | |
238 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
239 | */ | |
564dd50a | 240 | int |
241 | login_logout(struct logininfo *li) | |
242 | { | |
243 | li->type = LTYPE_LOGOUT; | |
244 | return login_write(li); | |
1d7b9b20 | 245 | } |
246 | ||
1d7b9b20 | 247 | |
5abcdf8e | 248 | /* login_get_lastlog_time(int) - Retrieve the last login time |
249 | * | |
250 | * Retrieve the last login time for the given uid. Will try to use the | |
251 | * system lastlog facilities if they are available, but will fall back | |
252 | * to looking in wtmp/wtmpx if necessary | |
253 | * | |
254 | * Returns: | |
255 | * 0 on failure, or if user has never logged in | |
256 | * Time in seconds from the epoch if successful | |
257 | * | |
258 | * Useful preprocessor symbols: | |
259 | * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog | |
260 | * info | |
261 | * USE_LASTLOG: If set, indicates the presence of system lastlog | |
262 | * facilities. If this and DISABLE_LASTLOG are not set, | |
263 | * try to retrieve lastlog information from wtmp/wtmpx. | |
264 | */ | |
564dd50a | 265 | unsigned int |
266 | login_get_lastlog_time(const int uid) | |
267 | { | |
268 | struct logininfo li; | |
1d7b9b20 | 269 | |
5abcdf8e | 270 | if (login_get_lastlog(&li, uid)) |
271 | return li.tv_sec; | |
272 | else | |
273 | return 0; | |
564dd50a | 274 | } |
1d7b9b20 | 275 | |
5abcdf8e | 276 | /* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry |
277 | * | |
278 | * Retrieve a logininfo structure populated (only partially) with | |
279 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
280 | * system lastlog information exists. | |
281 | * | |
282 | * Note this routine must be given a pre-allocated logininfo. | |
283 | * | |
284 | * Returns: | |
285 | * >0: A pointer to your struct logininfo if successful | |
286 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
287 | * | |
288 | */ | |
564dd50a | 289 | struct logininfo * |
290 | login_get_lastlog(struct logininfo *li, const int uid) | |
291 | { | |
5abcdf8e | 292 | #ifndef USE_LASTLOG |
293 | struct passwd *pw; | |
294 | #endif | |
295 | ||
564dd50a | 296 | memset(li, '\0', sizeof(struct logininfo)); |
1d7b9b20 | 297 | li->uid = uid; |
5abcdf8e | 298 | |
299 | #ifndef USE_LASTLOG | |
300 | /* If we don't have a 'real' lastlog, we need the username to | |
301 | * reliably search wtmp(x) for the last login (see | |
302 | * wtmp_get_entry().) */ | |
303 | pw = getpwuid(uid); | |
1bfbb762 | 304 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the |
305 | * username */ | |
306 | strlcpy(li->username, pw->pw_name, li->username); | |
5abcdf8e | 307 | #endif |
564dd50a | 308 | if (getlast_entry(li)) |
309 | return li; | |
310 | else | |
311 | return 0; | |
1d7b9b20 | 312 | } |
313 | ||
1d7b9b20 | 314 | |
5abcdf8e | 315 | /* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise |
316 | * a logininfo structure | |
317 | * | |
318 | * This function creates a new struct logininfo, a data structure | |
319 | * meant to carry the information required to portably record login info. | |
320 | * | |
321 | * Returns a pointer to a newly created struct logininfo. If memory | |
322 | * allocation fails, the program halts. | |
323 | */ | |
564dd50a | 324 | struct |
325 | logininfo *login_alloc_entry(int pid, const char *username, | |
326 | const char *hostname, const char *line) | |
327 | { | |
328 | struct logininfo *newli; | |
1d7b9b20 | 329 | |
564dd50a | 330 | newli = (struct logininfo *) xmalloc (sizeof(struct logininfo)); |
331 | (void)login_init_entry(newli, pid, username, hostname, line); | |
332 | return newli; | |
1d7b9b20 | 333 | } |
334 | ||
335 | ||
5abcdf8e | 336 | /* login_free_entry(struct logininfo *) - free struct memory */ |
1d7b9b20 | 337 | void |
564dd50a | 338 | login_free_entry(struct logininfo *li) |
339 | { | |
340 | xfree(li); | |
1d7b9b20 | 341 | } |
342 | ||
343 | ||
5abcdf8e | 344 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) |
345 | * - initialise a struct logininfo | |
346 | * | |
347 | * Populates a new struct logininfo, a data structure meant to carry | |
348 | * the information required to portably record login info. | |
349 | * | |
350 | * Returns: 1 | |
351 | */ | |
564dd50a | 352 | int |
353 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
354 | const char *hostname, const char *line) | |
355 | { | |
356 | /* zero the structure */ | |
357 | memset(li, 0, sizeof(struct logininfo)); | |
358 | ||
359 | li->pid = pid; | |
360 | /* set the line information */ | |
361 | if (line) | |
362 | line_fullname(li->line, line, sizeof(li->line)); | |
1d7b9b20 | 363 | |
564dd50a | 364 | if (username) |
365 | strlcpy(li->username, username, sizeof(li->username)); | |
366 | if (hostname) | |
367 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
368 | return 1; | |
1d7b9b20 | 369 | } |
370 | ||
5abcdf8e | 371 | /* login_set_current_time(struct logininfo *) - set the current time |
372 | * | |
373 | * Set the current time in a logininfo structure. This function is | |
374 | * meant to eliminate the need to deal with system dependencies for | |
375 | * time handling. | |
376 | */ | |
1d7b9b20 | 377 | void |
564dd50a | 378 | login_set_current_time(struct logininfo *li) |
379 | { | |
1d7b9b20 | 380 | #ifdef HAVE_SYS_TIME_H |
381 | struct timeval tv; | |
382 | ||
383 | gettimeofday(&tv, NULL); | |
384 | li->tv_sec = tv.tv_sec ; li->tv_usec = tv.tv_usec; | |
385 | #else | |
564dd50a | 386 | time_t tm = time(0); |
387 | ||
388 | li->tv_sec = tm; li->tv_usec = 0; | |
1d7b9b20 | 389 | #endif |
390 | } | |
391 | ||
1d7b9b20 | 392 | |
564dd50a | 393 | /* copy a sockaddr_* into our logininfo */ |
1d7b9b20 | 394 | void |
564dd50a | 395 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, |
396 | const unsigned int sa_size) | |
397 | { | |
398 | unsigned int bufsize = sa_size; | |
399 | ||
400 | /* make sure we don't overrun our union */ | |
401 | if (sizeof(li->hostaddr) < sa_size) | |
402 | bufsize = sizeof(li->hostaddr); | |
403 | ||
404 | memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize); | |
1d7b9b20 | 405 | } |
1d7b9b20 | 406 | |
564dd50a | 407 | |
408 | /** | |
409 | ** login_write: Call low-level recording functions based on autoconf | |
410 | ** results | |
411 | **/ | |
1d7b9b20 | 412 | |
413 | int | |
564dd50a | 414 | login_write (struct logininfo *li) |
415 | { | |
1d7b9b20 | 416 | if ((int)geteuid() != 0) { |
417 | log("Attempt to write login records by non-root user (aborting)"); | |
418 | return 1; | |
419 | } | |
420 | /* set the timestamp */ | |
421 | login_set_current_time(li); | |
422 | #ifdef USE_LOGIN | |
423 | syslogin_write_entry(li); | |
424 | #endif | |
425 | #ifdef USE_LASTLOG | |
426 | if (li->type == LTYPE_LOGIN) { | |
427 | lastlog_write_entry(li); | |
428 | } | |
429 | #endif | |
430 | #ifdef USE_UTMP | |
431 | utmp_write_entry(li); | |
432 | #endif | |
433 | #ifdef USE_WTMP | |
434 | wtmp_write_entry(li); | |
435 | #endif | |
436 | #ifdef USE_UTMPX | |
437 | utmpx_write_entry(li); | |
438 | #endif | |
439 | #ifdef USE_WTMPX | |
440 | wtmpx_write_entry(li); | |
441 | #endif | |
442 | return 0; | |
443 | } | |
444 | ||
1d7b9b20 | 445 | |
564dd50a | 446 | /** |
447 | ** getlast_entry: Call low-level functions to retrieve the last login | |
448 | ** time. | |
449 | **/ | |
1d7b9b20 | 450 | |
564dd50a | 451 | /* take the uid in li and return the last login time */ |
1d7b9b20 | 452 | int |
564dd50a | 453 | getlast_entry(struct logininfo *li) |
454 | { | |
455 | #ifdef USE_LASTLOG | |
456 | if (lastlog_get_entry(li)) | |
457 | return 1; | |
1d7b9b20 | 458 | else |
459 | return 0; | |
564dd50a | 460 | #else |
461 | /* !USE_LASTLOG */ | |
1d7b9b20 | 462 | |
3f45f1c3 | 463 | # ifdef DISABLE_LASTLOG |
464 | /* On some systems we shouldn't even try to obtain last login | |
465 | * time, e.g. AIX */ | |
466 | return 0; | |
467 | ||
468 | # else | |
564dd50a | 469 | /* Try to retrieve the last login time from wtmp */ |
3f45f1c3 | 470 | # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) |
564dd50a | 471 | /* retrieve last login time from utmp */ |
472 | if (wtmp_get_entry(li)) | |
473 | return 1; | |
1d7b9b20 | 474 | else |
475 | return 0; | |
3f45f1c3 | 476 | # else |
1d7b9b20 | 477 | |
564dd50a | 478 | /* If wtmp isn't available, try wtmpx */ |
1d7b9b20 | 479 | |
3f45f1c3 | 480 | # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) |
564dd50a | 481 | /* retrieve last login time from utmpx */ |
482 | if (wtmpx_get_entry(li)) | |
483 | return 1; | |
1d7b9b20 | 484 | else |
485 | return 0; | |
3f45f1c3 | 486 | # else |
1d7b9b20 | 487 | |
564dd50a | 488 | /* Give up: No means of retrieving last login time */ |
489 | return 0; | |
3f45f1c3 | 490 | # endif |
491 | /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */ | |
492 | ||
564dd50a | 493 | # endif |
3f45f1c3 | 494 | /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */ |
564dd50a | 495 | # endif |
3f45f1c3 | 496 | /* DISABLE_LASTLOG */ |
564dd50a | 497 | #endif |
498 | /* USE_LASTLOG */ | |
499 | } | |
1d7b9b20 | 500 | |
501 | ||
1d7b9b20 | 502 | |
503 | /* | |
564dd50a | 504 | * 'line' string utility functions |
505 | * | |
506 | * These functions process the 'line' string into one of three forms: | |
507 | * | |
1d7b9b20 | 508 | * 1. The full filename (including '/dev') |
509 | * 2. The stripped name (excluding '/dev') | |
564dd50a | 510 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 |
511 | * /dev/pts/1 -> ts/1 ) | |
1d7b9b20 | 512 | * |
513 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
514 | * attempting to remove it. Typically both addition and removal is | |
564dd50a | 515 | * performed by one application - say, sshd - so as long as the choice |
516 | * uniquely identifies a terminal it's ok. | |
1d7b9b20 | 517 | */ |
518 | ||
519 | ||
564dd50a | 520 | /* line_fullname(): add the leading '/dev/' if it doesn't exist make |
521 | * sure dst has enough space, if not just copy src (ugh) */ | |
1d7b9b20 | 522 | char * |
564dd50a | 523 | line_fullname(char *dst, const char *src, int dstsize) |
524 | { | |
1d7b9b20 | 525 | memset(dst, '\0', dstsize); |
526 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) | |
527 | strlcpy(dst, src, dstsize); | |
528 | else { | |
a4d05724 | 529 | strlcpy(dst, "/dev/", dstsize); |
1d7b9b20 | 530 | strlcat(dst, src, dstsize); |
531 | } | |
532 | return dst; | |
533 | } | |
534 | ||
564dd50a | 535 | |
536 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ | |
1d7b9b20 | 537 | char * |
564dd50a | 538 | line_stripname(char *dst, const char *src, int dstsize) |
539 | { | |
1d7b9b20 | 540 | memset(dst, '\0', dstsize); |
541 | if (strncmp(src, "/dev/", 5) == 0) | |
542 | strlcpy(dst, &src[5], dstsize); | |
543 | else | |
544 | strlcpy(dst, src, dstsize); | |
545 | return dst; | |
564dd50a | 546 | } |
547 | ||
1d7b9b20 | 548 | |
564dd50a | 549 | /* line_abbrevname(): Return the abbreviated (usually four-character) |
550 | * form of the line (Just use the last <dstsize> characters of the | |
551 | * full name.) | |
552 | * | |
553 | * NOTE: use strncpy because we do NOT necessarily want zero | |
554 | * termination */ | |
1d7b9b20 | 555 | char * |
556 | line_abbrevname(char *dst, const char *src, int dstsize) { | |
557 | memset(dst, '\0', dstsize); | |
564dd50a | 558 | src += (strlen(src) - dstsize); |
559 | strncpy(dst, src, dstsize); /* note: _don't_ change this to strlcpy */ | |
1d7b9b20 | 560 | return dst; |
561 | } | |
562 | ||
563 | ||
564 | /** | |
565 | ** utmp utility functions | |
564dd50a | 566 | ** |
567 | ** These functions manipulate struct utmp, taking system differences | |
568 | ** into account. | |
1d7b9b20 | 569 | **/ |
570 | ||
571 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
572 | ||
1d7b9b20 | 573 | /* build the utmp structure */ |
574 | void | |
564dd50a | 575 | set_utmp_time(struct logininfo *li, struct utmp *ut) |
576 | { | |
1d7b9b20 | 577 | #ifdef HAVE_TV_IN_UTMP |
578 | ut->ut_tv.tv_sec = li->tv_sec; | |
579 | ut->ut_tv.tv_usec = li->tv_usec; | |
580 | #else | |
581 | # ifdef HAVE_TIME_IN_UTMP | |
582 | ut->ut_time = li->tv_sec; | |
583 | # endif | |
584 | #endif | |
585 | } | |
586 | ||
564dd50a | 587 | |
1d7b9b20 | 588 | void |
589 | construct_utmp(struct logininfo *li, | |
564dd50a | 590 | struct utmp *ut) |
591 | { | |
1d7b9b20 | 592 | memset(ut, '\0', sizeof(struct utmp)); |
5abcdf8e | 593 | |
594 | /* First fill out fields used for both logins and logouts */ | |
595 | ||
1d7b9b20 | 596 | #ifdef HAVE_ID_IN_UTMP |
597 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); | |
598 | #endif | |
599 | ||
600 | #ifdef HAVE_TYPE_IN_UTMP | |
5abcdf8e | 601 | /* This is done here to keep utmp constants out of struct logininfo */ |
1d7b9b20 | 602 | switch (li->type) { |
603 | case LTYPE_LOGIN: | |
604 | ut->ut_type = USER_PROCESS; | |
605 | break; | |
606 | case LTYPE_LOGOUT: | |
607 | ut->ut_type = DEAD_PROCESS; | |
608 | break; | |
609 | } | |
610 | #endif | |
5abcdf8e | 611 | set_utmp_time(li, ut); |
1d7b9b20 | 612 | |
5abcdf8e | 613 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); |
1d7b9b20 | 614 | #ifdef HAVE_PID_IN_UTMP |
615 | ut->ut_pid = li->pid; | |
616 | #endif | |
5abcdf8e | 617 | |
618 | /* If we're logging out, leave all other fields blank */ | |
619 | if (li->type == LTYPE_LOGOUT) | |
620 | return; | |
621 | ||
622 | /* These fields are only used when logging in, and are blank | |
623 | * for logouts. */ | |
624 | ||
625 | /* Use strncpy because we don't necessarily want null termination */ | |
626 | strncpy(ut->ut_user, li->username, MIN_SIZEOF(ut->ut_user, li->username)); | |
1d7b9b20 | 627 | #ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 628 | strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname)); |
1d7b9b20 | 629 | #endif |
630 | #ifdef HAVE_ADDR_IN_UTMP | |
564dd50a | 631 | /* this is just a 32-bit IP address */ |
632 | if (li->hostaddr.sa.sa_family == AF_INET) | |
633 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
634 | #endif | |
635 | } | |
1d7b9b20 | 636 | |
637 | #endif | |
638 | /* USE_UTMP || USE_WTMP || USE_LOGIN */ | |
639 | ||
564dd50a | 640 | |
641 | ||
1d7b9b20 | 642 | /** |
643 | ** utmpx utility functions | |
564dd50a | 644 | ** |
645 | ** These functions manipulate struct utmpx, accounting for system | |
646 | ** variations. | |
1d7b9b20 | 647 | **/ |
648 | ||
649 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
650 | ||
1d7b9b20 | 651 | /* build the utmpx structure */ |
652 | void | |
564dd50a | 653 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) |
654 | { | |
1d7b9b20 | 655 | #ifdef HAVE_TV_IN_UTMPX |
656 | utx->ut_tv.tv_sec = li->tv_sec; | |
657 | utx->ut_tv.tv_usec = li->tv_usec; | |
658 | #else | |
659 | # ifdef HAVE_TIME_IN_UTMPX | |
660 | utx->ut_time = li->tv_sec; | |
661 | # endif | |
662 | #endif | |
663 | } | |
664 | ||
564dd50a | 665 | |
1d7b9b20 | 666 | void |
564dd50a | 667 | construct_utmpx(struct logininfo *li, struct utmpx *utx) |
668 | { | |
1d7b9b20 | 669 | memset(utx, '\0', sizeof(struct utmpx)); |
1d7b9b20 | 670 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); |
671 | ||
672 | /* this is done here to keep utmp constants out of loginrec.h */ | |
673 | switch (li->type) { | |
674 | case LTYPE_LOGIN: | |
675 | utx->ut_type = USER_PROCESS; | |
676 | break; | |
677 | case LTYPE_LOGOUT: | |
678 | utx->ut_type = DEAD_PROCESS; | |
679 | break; | |
680 | } | |
1d7b9b20 | 681 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); |
1d7b9b20 | 682 | set_utmpx_time(li, utx); |
5abcdf8e | 683 | utx->ut_pid = li->pid; |
684 | ||
685 | if (li->type == LTYPE_LOGOUT) | |
686 | return; | |
687 | ||
688 | /* These fields are only used when logging in, and are blank | |
689 | * for logouts. */ | |
690 | ||
691 | /* strncpy(): Don't necessarily want null termination */ | |
692 | strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username)); | |
1d7b9b20 | 693 | #ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 694 | strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname)); |
1d7b9b20 | 695 | #endif |
696 | #ifdef HAVE_ADDR_IN_UTMPX | |
564dd50a | 697 | /* FIXME: (ATL) not supported yet */ |
1d7b9b20 | 698 | #endif |
5abcdf8e | 699 | #ifdef HAVE_SYSLEN_IN_UTMPX |
700 | /* ut_syslen is the length of the utx_host string */ | |
701 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
1d7b9b20 | 702 | #endif |
564dd50a | 703 | } |
1d7b9b20 | 704 | |
705 | #endif | |
706 | /* USE_UTMPX || USE_WTMPX */ | |
707 | ||
708 | ||
709 | ||
710 | /** | |
564dd50a | 711 | ** Low-level utmp functions |
1d7b9b20 | 712 | **/ |
713 | ||
714 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
715 | ||
716 | #ifdef USE_UTMP | |
717 | ||
1d7b9b20 | 718 | /* if we can, use pututline() etc. */ |
719 | #if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ | |
720 | defined(HAVE_PUTUTLINE) | |
721 | # define UTMP_USE_LIBRARY | |
722 | #endif | |
723 | ||
724 | ||
725 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
726 | #ifdef UTMP_USE_LIBRARY | |
727 | static int | |
564dd50a | 728 | utmp_write_library(struct logininfo *li, struct utmp *ut) |
729 | { | |
1d7b9b20 | 730 | setutent(); |
731 | pututline(ut); | |
732 | ||
733 | #ifdef HAVE_ENDUTENT | |
734 | endutent(); | |
735 | #endif | |
736 | return 1; | |
564dd50a | 737 | } |
1d7b9b20 | 738 | |
739 | #else | |
740 | ||
741 | /* write a utmp entry direct to the file */ | |
564dd50a | 742 | /* This is a slightly modification of code in OpenBSD's login.c */ |
1d7b9b20 | 743 | static int |
564dd50a | 744 | utmp_write_direct(struct logininfo *li, struct utmp *ut) |
745 | { | |
1d7b9b20 | 746 | struct utmp old_ut; |
747 | register int fd; | |
748 | int tty; | |
749 | ||
5abcdf8e | 750 | /* FIXME: (ATL) ttyslot() needs local implementation */ |
1d7b9b20 | 751 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ |
752 | ||
753 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { | |
754 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
755 | /* | |
756 | * Prevent luser from zero'ing out ut_host. | |
757 | * If the new ut_line is empty but the old one is not | |
758 | * and ut_line and ut_name match, preserve the old ut_line. | |
759 | */ | |
760 | if ( read(fd, &old_ut, sizeof(struct utmp)) == sizeof(struct utmp) | |
761 | && ut->ut_host[0] == '\0' | |
762 | && old_ut.ut_host[0] != '\0' | |
763 | && strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0 | |
764 | && strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0 ) | |
765 | (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); | |
766 | ||
767 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
768 | if (write(fd, ut, sizeof(struct utmp))==-1) | |
769 | log("utmp_write_direct: error writing %s: %s", | |
5abcdf8e | 770 | UTMP_FILE, strerror(errno)); |
1d7b9b20 | 771 | |
772 | (void)close(fd); | |
773 | return 1; | |
774 | } else | |
775 | return 0; | |
564dd50a | 776 | } |
1d7b9b20 | 777 | #endif /* UTMP_USE_LIBRARY */ |
778 | ||
779 | ||
780 | static int | |
564dd50a | 781 | utmp_perform_login(struct logininfo *li) |
782 | { | |
1d7b9b20 | 783 | struct utmp ut; |
784 | ||
785 | construct_utmp(li, &ut); | |
1d7b9b20 | 786 | #ifdef UTMP_USE_LIBRARY |
787 | if (!utmp_write_library(li, &ut)) { | |
5abcdf8e | 788 | log("utmp_perform_login: utmp_write_library() failed"); |
1d7b9b20 | 789 | return 0; |
790 | } | |
791 | #else | |
792 | if (!utmp_write_direct(li, &ut)) { | |
793 | log("utmp_perform_login: utmp_write_direct() failed"); | |
794 | return 0; | |
795 | } | |
796 | #endif | |
797 | return 1; | |
564dd50a | 798 | } |
1d7b9b20 | 799 | |
800 | ||
801 | static int | |
564dd50a | 802 | utmp_perform_logout(struct logininfo *li) |
803 | { | |
1d7b9b20 | 804 | struct utmp ut; |
805 | ||
5abcdf8e | 806 | construct_utmp(li, &ut); |
807 | #ifdef UTMP_USE_LIBRARY | |
808 | if (!utmp_write_library(li, &ut)) { | |
809 | log("utmp_perform_logout: utmp_write_library() failed"); | |
810 | return 0; | |
811 | } | |
1d7b9b20 | 812 | #else |
5abcdf8e | 813 | if (!utmp_write_direct(li, &ut)) { |
814 | log("utmp_perform_logout: utmp_write_direct() failed"); | |
815 | return 0; | |
816 | } | |
1d7b9b20 | 817 | #endif |
1d7b9b20 | 818 | return 1; |
564dd50a | 819 | } |
1d7b9b20 | 820 | |
821 | ||
822 | int | |
564dd50a | 823 | utmp_write_entry(struct logininfo *li) |
824 | { | |
1d7b9b20 | 825 | switch(li->type) { |
826 | case LTYPE_LOGIN: | |
827 | return utmp_perform_login(li); | |
828 | ||
829 | case LTYPE_LOGOUT: | |
830 | return utmp_perform_logout(li); | |
831 | ||
832 | default: | |
833 | log("utmp_write_entry: invalid type field"); | |
834 | return 0; | |
835 | } | |
564dd50a | 836 | } |
1d7b9b20 | 837 | |
838 | ||
839 | #endif | |
840 | /* USE_UTMP */ | |
841 | ||
842 | ||
843 | /** | |
564dd50a | 844 | ** Low-level utmpx functions |
1d7b9b20 | 845 | **/ |
846 | ||
847 | /* not much point if we don't want utmpx entries */ | |
848 | #ifdef USE_UTMPX | |
849 | ||
1d7b9b20 | 850 | /* if we have the wherewithall, use pututxline etc. */ |
851 | #if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) \ | |
852 | && defined(HAVE_PUTUTXLINE) | |
853 | # define UTMPX_USE_LIBRARY | |
854 | #endif | |
855 | ||
856 | ||
857 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
858 | #ifdef UTMPX_USE_LIBRARY | |
859 | static int | |
564dd50a | 860 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) |
861 | { | |
1d7b9b20 | 862 | setutxent(); |
863 | pututxline(utx); | |
864 | ||
865 | #ifdef HAVE_ENDUTXENT | |
866 | endutxent(); | |
867 | #endif | |
868 | return 1; | |
564dd50a | 869 | } |
1d7b9b20 | 870 | |
871 | #else | |
872 | /* UTMPX_USE_LIBRARY */ | |
873 | ||
874 | ||
875 | /* write a utmp entry direct to the file */ | |
876 | static int | |
564dd50a | 877 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) |
878 | { | |
1d7b9b20 | 879 | log("utmpx_write_direct: not implemented!"); |
880 | return 0; | |
564dd50a | 881 | } |
1d7b9b20 | 882 | |
883 | #endif | |
884 | /* UTMPX_USE_LIBRARY */ | |
885 | ||
886 | static int | |
564dd50a | 887 | utmpx_perform_login(struct logininfo *li) |
888 | { | |
1d7b9b20 | 889 | struct utmpx utx; |
890 | ||
891 | construct_utmpx(li, &utx); | |
1d7b9b20 | 892 | #ifdef UTMPX_USE_LIBRARY |
893 | if (!utmpx_write_library(li, &utx)) { | |
894 | log("utmpx_perform_login: utmp_write_library() failed"); | |
895 | return 0; | |
896 | } | |
897 | #else | |
898 | if (!utmpx_write_direct(li, &ut)) { | |
899 | log("utmpx_perform_login: utmp_write_direct() failed"); | |
900 | return 0; | |
901 | } | |
902 | #endif | |
903 | return 1; | |
564dd50a | 904 | } |
1d7b9b20 | 905 | |
906 | ||
907 | static int | |
564dd50a | 908 | utmpx_perform_logout(struct logininfo *li) |
909 | { | |
1d7b9b20 | 910 | struct utmpx utx; |
911 | ||
912 | memset(&utx, '\0', sizeof(utx)); | |
913 | set_utmpx_time(li, &utx); | |
914 | line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line)); | |
915 | #ifdef HAVE_ID_IN_UTMPX | |
916 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); | |
917 | #endif | |
918 | #ifdef HAVE_TYPE_IN_UTMPX | |
919 | utx.ut_type = DEAD_PROCESS; | |
920 | #endif | |
921 | ||
922 | #ifdef UTMPX_USE_LIBRARY | |
923 | utmpx_write_library(li, &utx); | |
924 | #else | |
925 | utmpx_write_direct(li, &utx); | |
926 | #endif | |
1d7b9b20 | 927 | return 1; |
564dd50a | 928 | } |
1d7b9b20 | 929 | |
930 | ||
931 | int | |
564dd50a | 932 | utmpx_write_entry(struct logininfo *li) |
933 | { | |
1d7b9b20 | 934 | switch(li->type) { |
935 | case LTYPE_LOGIN: | |
936 | return utmpx_perform_login(li); | |
937 | case LTYPE_LOGOUT: | |
938 | return utmpx_perform_logout(li); | |
939 | default: | |
940 | log("utmpx_write_entry: invalid type field"); | |
941 | return 0; | |
942 | } | |
564dd50a | 943 | } |
1d7b9b20 | 944 | |
945 | ||
946 | #endif | |
947 | /* USE_UTMPX */ | |
948 | ||
949 | ||
950 | /** | |
564dd50a | 951 | ** Low-level wtmp functions |
1d7b9b20 | 952 | **/ |
953 | ||
954 | #ifdef USE_WTMP | |
955 | ||
1d7b9b20 | 956 | /* write a wtmp entry direct to the end of the file */ |
564dd50a | 957 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 958 | static int |
564dd50a | 959 | wtmp_write(struct logininfo *li, struct utmp *ut) |
960 | { | |
1d7b9b20 | 961 | struct stat buf; |
962 | int fd, ret = 1; | |
963 | ||
964 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
965 | log("wtmp_write: problem writing %s: %s", | |
966 | WTMP_FILE, strerror(errno)); | |
967 | return 0; | |
968 | } | |
564dd50a | 969 | if (fstat(fd, &buf) == 0) |
1d7b9b20 | 970 | if (write(fd, (char *)ut, sizeof(struct utmp)) != |
971 | sizeof(struct utmp)) { | |
972 | ftruncate(fd, buf.st_size); | |
973 | log("wtmp_write: problem writing %s: %s", | |
974 | WTMP_FILE, strerror(errno)); | |
975 | ret = 0; | |
976 | } | |
977 | (void)close(fd); | |
1d7b9b20 | 978 | return ret; |
564dd50a | 979 | } |
1d7b9b20 | 980 | |
981 | ||
982 | static int | |
564dd50a | 983 | wtmp_perform_login(struct logininfo *li){ |
1d7b9b20 | 984 | struct utmp ut; |
985 | ||
986 | construct_utmp(li, &ut); | |
987 | return wtmp_write(li, &ut); | |
564dd50a | 988 | } |
1d7b9b20 | 989 | |
990 | ||
991 | static int | |
564dd50a | 992 | wtmp_perform_logout(struct logininfo *li) |
993 | { | |
1d7b9b20 | 994 | struct utmp ut; |
995 | ||
996 | construct_utmp(li, &ut); | |
1d7b9b20 | 997 | return wtmp_write(li, &ut); |
564dd50a | 998 | } |
1d7b9b20 | 999 | |
1000 | ||
1001 | int | |
564dd50a | 1002 | wtmp_write_entry(struct logininfo *li) |
1003 | { | |
1d7b9b20 | 1004 | switch(li->type) { |
1005 | case LTYPE_LOGIN: | |
1006 | return wtmp_perform_login(li); | |
1007 | case LTYPE_LOGOUT: | |
1008 | return wtmp_perform_logout(li); | |
1009 | default: | |
1010 | log("wtmp_write_entry: invalid type field"); | |
1011 | return 0; | |
1012 | } | |
564dd50a | 1013 | } |
1d7b9b20 | 1014 | |
1015 | ||
5abcdf8e | 1016 | /* Notes on fetching login data from wtmp/wtmpx |
1017 | * | |
1018 | * Logouts are usually recorded with (amongst other things) a blank | |
1019 | * username on a given tty line. However, some systems (HP-UX is one) | |
1020 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1021 | * | |
1022 | * Since we're only looking for logins here, we know that the username | |
1023 | * must be set correctly. On systems that leave it in, we check for | |
1024 | * ut_type==USER_PROCESS (indicating a login.) | |
1025 | * | |
1026 | * Portability: Some systems may set something other than USER_PROCESS | |
1027 | * to indicate a login process. I don't know of any as I write. Also, | |
1028 | * it's possible that some systems may both leave the username in | |
1029 | * place and not have ut_type. | |
1030 | */ | |
1031 | ||
1032 | ||
1033 | /* return true if this wtmp entry indicates a login */ | |
1034 | static int | |
1035 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1036 | { | |
1037 | if ( strncmp(li->username, ut->ut_user, | |
1038 | MIN_SIZEOF(li->username, ut->ut_user)) == 0 ) { | |
1039 | #ifdef HAVE_TYPE_IN_UTMP | |
1040 | if (ut->ut_type & USER_PROCESS) | |
1041 | return 1; | |
1042 | #else | |
1043 | return 1; | |
1044 | #endif | |
1045 | } | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | ||
1d7b9b20 | 1050 | int |
564dd50a | 1051 | wtmp_get_entry(struct logininfo *li) |
1052 | { | |
1d7b9b20 | 1053 | struct stat st; |
1054 | struct utmp ut; | |
5abcdf8e | 1055 | int fd, found=0; |
1056 | ||
1057 | /* Clear the time entries in our logininfo */ | |
1058 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1059 | |
1060 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
1061 | log("wtmp_get_entry: problem opening %s: %s", | |
1062 | WTMP_FILE, strerror(errno)); | |
1063 | return 0; | |
1064 | } | |
564dd50a | 1065 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1066 | log("wtmp_get_entry: couldn't stat %s: %s", |
1067 | WTMP_FILE, strerror(errno)); | |
1068 | close(fd); | |
1069 | return 0; | |
1070 | } | |
1d7b9b20 | 1071 | |
5abcdf8e | 1072 | /* Seek to the start of the last struct utmp */ |
1073 | if (lseek(fd, (off_t)(0-sizeof(struct utmp)), SEEK_END) == -1) { | |
1074 | /* Looks like we've got a fresh wtmp file */ | |
1075 | close(fd); | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | while (!found) { | |
1d7b9b20 | 1080 | if (read(fd, &ut, sizeof(ut)) != sizeof(ut)) { |
1081 | log("wtmp_get_entry: read of %s failed: %s", | |
1082 | WTMP_FILE, strerror(errno)); | |
1083 | close (fd); | |
1084 | return 0; | |
1085 | } | |
5abcdf8e | 1086 | if ( wtmp_islogin(li, &ut) ) { |
1087 | found = 1; | |
1088 | /* We've already checked for a time in struct | |
1089 | * utmp, in login_getlast(). */ | |
1d7b9b20 | 1090 | #ifdef HAVE_TIME_IN_UTMP |
1091 | li->tv_sec = ut.ut_time; | |
1092 | #else | |
1093 | # if HAVE_TV_IN_UTMP | |
1094 | li->tv_sec = ut.ut_tv.tv_sec; | |
1095 | # endif | |
1096 | #endif | |
5abcdf8e | 1097 | line_fullname(li->line, ut.ut_line, |
1098 | MIN_SIZEOF(li->line, ut.ut_line)); | |
1d7b9b20 | 1099 | #ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 1100 | strlcpy(li->hostname, ut.ut_host, |
1101 | MIN_SIZEOF(li->hostname, ut.ut_host)); | |
1d7b9b20 | 1102 | #endif |
5abcdf8e | 1103 | continue; |
1d7b9b20 | 1104 | } |
5abcdf8e | 1105 | /* Seek back 2 x struct utmp */ |
1d7b9b20 | 1106 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) { |
5abcdf8e | 1107 | /* We've found the start of the file, so quit */ |
1d7b9b20 | 1108 | close (fd); |
1109 | return 0; | |
1110 | } | |
5abcdf8e | 1111 | } |
1112 | ||
1113 | /* We found an entry. Tidy up and return */ | |
1114 | close(fd); | |
1d7b9b20 | 1115 | return 1; |
564dd50a | 1116 | } |
1d7b9b20 | 1117 | |
1118 | ||
1119 | #endif | |
1120 | /* USE_WTMP */ | |
1121 | ||
1122 | ||
1123 | /** | |
564dd50a | 1124 | ** Low-level wtmpx functions |
1d7b9b20 | 1125 | **/ |
1126 | ||
1127 | #ifdef USE_WTMPX | |
1128 | ||
1d7b9b20 | 1129 | /* write a wtmpx entry direct to the end of the file */ |
564dd50a | 1130 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 1131 | static int |
564dd50a | 1132 | wtmpx_write(struct logininfo *li, struct utmpx *utx) |
1133 | { | |
1d7b9b20 | 1134 | struct stat buf; |
1135 | int fd, ret = 1; | |
1136 | ||
1137 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1138 | log("wtmpx_write: problem opening %s: %s", | |
1139 | WTMPX_FILE, strerror(errno)); | |
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | if (fstat(fd, &buf) == 0) | |
1144 | if (write(fd, (char *)utx, sizeof(struct utmpx)) != | |
1145 | sizeof(struct utmpx)) { | |
1146 | ftruncate(fd, buf.st_size); | |
1147 | log("wtmpx_write: problem writing %s: %s", | |
1148 | WTMPX_FILE, strerror(errno)); | |
1149 | ret = 0; | |
1150 | } | |
1151 | (void)close(fd); | |
1152 | ||
1153 | return ret; | |
564dd50a | 1154 | } |
1d7b9b20 | 1155 | |
1156 | ||
1157 | static int | |
564dd50a | 1158 | wtmpx_perform_login(struct logininfo *li) |
1159 | { | |
1d7b9b20 | 1160 | struct utmpx utx; |
1161 | ||
1162 | construct_utmpx(li, &utx); | |
1163 | return wtmpx_write(li, &utx); | |
564dd50a | 1164 | } |
1d7b9b20 | 1165 | |
1166 | ||
1167 | static int | |
564dd50a | 1168 | wtmpx_perform_logout(struct logininfo *li) |
1169 | { | |
1d7b9b20 | 1170 | struct utmpx utx; |
1171 | ||
1172 | construct_utmpx(li, &utx); | |
1d7b9b20 | 1173 | return wtmpx_write(li, &utx); |
564dd50a | 1174 | } |
1d7b9b20 | 1175 | |
1176 | ||
1177 | int | |
564dd50a | 1178 | wtmpx_write_entry(struct logininfo *li) |
1179 | { | |
1d7b9b20 | 1180 | switch(li->type) { |
1181 | case LTYPE_LOGIN: | |
1182 | return wtmpx_perform_login(li); | |
1183 | case LTYPE_LOGOUT: | |
1184 | return wtmpx_perform_logout(li); | |
1185 | default: | |
1186 | log("wtmpx_write_entry: invalid type field"); | |
1187 | return 0; | |
1188 | } | |
564dd50a | 1189 | } |
1d7b9b20 | 1190 | |
5abcdf8e | 1191 | /* Please see the notes above wtmp_islogin() for information about the |
1192 | next two functions */ | |
1193 | ||
1194 | /* Return true if this wtmpx entry indicates a login */ | |
1195 | static int | |
1196 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1197 | { | |
1198 | if ( strncmp(li->username, utx->ut_user, | |
b9afc393 | 1199 | MIN_SIZEOF(li->username, utx->ut_user)) == 0 ) { |
5abcdf8e | 1200 | #ifdef HAVE_TYPE_IN_UTMPX |
1201 | if (utx->ut_type == USER_PROCESS) | |
1202 | return 1; | |
1203 | #else | |
1204 | return 1; | |
1205 | #endif | |
1206 | } | |
1207 | return 0; | |
1208 | } | |
1209 | ||
1d7b9b20 | 1210 | |
1211 | int | |
564dd50a | 1212 | wtmpx_get_entry(struct logininfo *li) |
1213 | { | |
1d7b9b20 | 1214 | struct stat st; |
1215 | struct utmpx utx; | |
5abcdf8e | 1216 | int fd, found=0; |
1217 | ||
1218 | /* Clear the time entries */ | |
1219 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1220 | |
1221 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1222 | log("wtmpx_get_entry: problem opening %s: %s", | |
1223 | WTMPX_FILE, strerror(errno)); | |
1224 | return 0; | |
1225 | } | |
564dd50a | 1226 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1227 | log("wtmpx_get_entry: couldn't stat %s: %s", |
1228 | WTMP_FILE, strerror(errno)); | |
1229 | close(fd); | |
1230 | return 0; | |
1231 | } | |
5abcdf8e | 1232 | |
1233 | /* Seek to the start of the last struct utmpx */ | |
1234 | if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) { | |
1235 | /* probably a newly rotated wtmpx file */ | |
1236 | close(fd); | |
1237 | return 0; | |
1238 | } | |
1d7b9b20 | 1239 | |
5abcdf8e | 1240 | while (!found) { |
1d7b9b20 | 1241 | if (read(fd, &utx, sizeof(utx)) != sizeof(utx)) { |
1242 | log("wtmpx_get_entry: read of %s failed: %s", | |
1243 | WTMPX_FILE, strerror(errno)); | |
1244 | close (fd); | |
1245 | return 0; | |
1246 | } | |
1d7b9b20 | 1247 | /* Logouts are recorded as a blank username on a particular line. |
1248 | * So, we just need to find the username in struct utmpx */ | |
5abcdf8e | 1249 | if ( wtmpx_islogin(li, &utx) ) { |
1d7b9b20 | 1250 | #ifdef HAVE_TV_IN_UTMPX |
1251 | li->tv_sec = utx.ut_tv.tv_sec; | |
1252 | #else | |
1253 | # ifdef HAVE_TIME_IN_UTMPX | |
1254 | li->tv_sec = utx.ut_time; | |
1255 | # endif | |
1256 | #endif | |
a4d05724 | 1257 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); |
1d7b9b20 | 1258 | #ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 1259 | strlcpy(li->hostname, utx.ut_host, |
1260 | MIN_SIZEOF(li->hostname, utx.ut_host)); | |
1d7b9b20 | 1261 | #endif |
5abcdf8e | 1262 | continue; |
1d7b9b20 | 1263 | } |
1264 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1265 | close (fd); | |
1266 | return 0; | |
1267 | } | |
5abcdf8e | 1268 | } |
1269 | ||
1270 | close(fd); | |
1d7b9b20 | 1271 | return 1; |
564dd50a | 1272 | } |
1d7b9b20 | 1273 | |
1274 | ||
f988dce5 | 1275 | #endif /* USE_WTMPX */ |
1d7b9b20 | 1276 | |
1277 | ||
1278 | /** | |
564dd50a | 1279 | ** Low-level libutil login() functions |
1d7b9b20 | 1280 | **/ |
1281 | ||
1282 | #ifdef USE_LOGIN | |
1283 | ||
1d7b9b20 | 1284 | static int |
564dd50a | 1285 | syslogin_perform_login(struct logininfo *li) |
1286 | { | |
1d7b9b20 | 1287 | struct utmp *ut; |
1288 | ||
1289 | if (! (ut = (struct utmp *)malloc(sizeof(struct utmp)))) { | |
1290 | log("syslogin_perform_login: couldn't malloc()"); | |
1291 | return 0; | |
1292 | } | |
1293 | construct_utmp(li, ut); | |
1294 | login(ut); | |
1295 | ||
1296 | return 1; | |
564dd50a | 1297 | } |
1d7b9b20 | 1298 | |
1d7b9b20 | 1299 | |
564dd50a | 1300 | static int |
1301 | syslogin_perform_logout(struct logininfo *li) | |
1302 | { | |
1d7b9b20 | 1303 | #ifdef HAVE_LOGOUT |
1304 | char line[8]; | |
1305 | ||
1306 | (void)line_stripname(line, li->line, sizeof(line)); | |
1307 | ||
1308 | if (!logout(line)) { | |
1309 | log("syslogin_perform_logout: logout() returned an error"); | |
f988dce5 | 1310 | # ifdef HAVE_LOGWTMP |
1d7b9b20 | 1311 | } else { |
1312 | logwtmp(line, "", ""); | |
1313 | } | |
f988dce5 | 1314 | # endif |
5abcdf8e | 1315 | /* FIXME: (ATL - if the need arises) What to do if we have |
1316 | * login, but no logout? what if logout but no logwtmp? All | |
1317 | * routines are in libutil so they should all be there, | |
1318 | * but... */ | |
1d7b9b20 | 1319 | #endif |
1320 | return 1; | |
564dd50a | 1321 | } |
1d7b9b20 | 1322 | |
1323 | ||
1324 | int | |
564dd50a | 1325 | syslogin_write_entry(struct logininfo *li) |
1326 | { | |
1d7b9b20 | 1327 | switch (li->type) { |
1328 | case LTYPE_LOGIN: | |
1329 | return syslogin_perform_login(li); | |
1330 | case LTYPE_LOGOUT: | |
1331 | return syslogin_perform_logout(li); | |
1332 | default: | |
1333 | log("syslogin_write_entry: Invalid type field"); | |
1334 | return 0; | |
1335 | } | |
564dd50a | 1336 | } |
1d7b9b20 | 1337 | |
1338 | ||
f988dce5 | 1339 | #endif /* USE_LOGIN */ |
1d7b9b20 | 1340 | |
1341 | /* end of file log-syslogin.c */ | |
1342 | ||
1343 | ||
1344 | /** | |
564dd50a | 1345 | ** Low-level lastlog functions |
1d7b9b20 | 1346 | **/ |
1347 | ||
1348 | #ifdef USE_LASTLOG | |
1349 | ||
1d7b9b20 | 1350 | static void |
564dd50a | 1351 | lastlog_construct(struct logininfo *li, struct lastlog *last) |
1352 | { | |
1d7b9b20 | 1353 | /* clear the structure */ |
1354 | memset(last, '\0', sizeof(struct lastlog)); | |
1355 | ||
1356 | (void)line_stripname(last->ll_line, li->line, | |
1357 | sizeof(last->ll_line)); | |
5abcdf8e | 1358 | strlcpy(last->ll_host, li->hostname, |
1359 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1d7b9b20 | 1360 | last->ll_time = li->tv_sec; |
564dd50a | 1361 | } |
1d7b9b20 | 1362 | |
1363 | ||
1364 | #define LL_FILE 1 | |
1365 | #define LL_DIR 2 | |
1366 | #define LL_OTHER 3 | |
1367 | ||
1368 | static int | |
564dd50a | 1369 | lastlog_filetype(char *filename) |
1370 | { | |
1d7b9b20 | 1371 | struct stat st; |
1372 | ||
1373 | if ( stat(LASTLOG_FILE, &st) != 0) { | |
1374 | log("lastlog_perform_login: Couldn't stat %s: %s", | |
1375 | LASTLOG_FILE, strerror(errno)); | |
1376 | return 0; | |
1377 | } | |
1d7b9b20 | 1378 | if (S_ISDIR(st.st_mode)) |
1379 | return LL_DIR; | |
1380 | else if (S_ISREG(st.st_mode)) | |
1381 | return LL_FILE; | |
1382 | else | |
1383 | return LL_OTHER; | |
564dd50a | 1384 | } |
1d7b9b20 | 1385 | |
1386 | ||
1387 | /* open the file (using filemode) and seek to the login entry */ | |
1388 | static int | |
564dd50a | 1389 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) |
1390 | { | |
1d7b9b20 | 1391 | off_t offset; |
1392 | int type; | |
1393 | char lastlog_file[1024]; | |
1394 | ||
1395 | type = lastlog_filetype(LASTLOG_FILE); | |
1396 | switch (type) { | |
1397 | case LL_FILE: | |
1398 | strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); | |
1399 | break; | |
1400 | case LL_DIR: | |
1401 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1402 | LASTLOG_FILE, li->username); | |
1403 | break; | |
1404 | default: | |
1405 | log("lastlog_openseek: %.100s is not a file or directory!", | |
1406 | LASTLOG_FILE); | |
1407 | return 0; | |
1408 | } /* switch */ | |
1409 | ||
1410 | *fd = open(lastlog_file, filemode); | |
1411 | if ( *fd < 0) { | |
1412 | log("lastlog_openseek: Couldn't open %s: %s", | |
1413 | lastlog_file, strerror(errno)); | |
1414 | return 0; | |
1415 | } | |
1d7b9b20 | 1416 | /* find this uid's offset in the lastlog file */ |
1417 | offset = (off_t) ( (long)li->uid * sizeof(struct lastlog)); | |
1418 | ||
1419 | if ( lseek(*fd, offset, SEEK_SET) != offset ) { | |
1420 | log("lastlog_openseek: %s->lseek(): %s", | |
1421 | lastlog_file, strerror(errno)); | |
1422 | return 0; | |
1423 | } | |
1424 | return 1; | |
564dd50a | 1425 | } |
1d7b9b20 | 1426 | |
1427 | static int | |
564dd50a | 1428 | lastlog_perform_login(struct logininfo *li) |
1429 | { | |
1d7b9b20 | 1430 | struct lastlog last; |
1431 | int fd; | |
1432 | ||
1433 | /* create our struct lastlog */ | |
1434 | lastlog_construct(li, &last); | |
1435 | ||
1436 | /* write the entry */ | |
1437 | if (lastlog_openseek(li, &fd, O_RDWR)) { | |
1438 | if ( write(fd, &last, sizeof(struct lastlog)) | |
1439 | != sizeof(struct lastlog) ) { | |
1440 | log("lastlog_write_filemode: Error writing to %s: %s", | |
1441 | LASTLOG_FILE, strerror(errno)); | |
1442 | return 0; | |
1443 | } | |
1444 | return 1; | |
1445 | } else | |
1446 | return 0; | |
564dd50a | 1447 | } |
1d7b9b20 | 1448 | |
1449 | ||
1450 | int | |
564dd50a | 1451 | lastlog_write_entry(struct logininfo *li) |
1452 | { | |
1d7b9b20 | 1453 | switch(li->type) { |
1454 | case LTYPE_LOGIN: | |
1455 | return lastlog_perform_login(li); | |
1456 | default: | |
1457 | log("lastlog_write_entry: Invalid type field"); | |
1458 | return 0; | |
1459 | } | |
564dd50a | 1460 | } |
1d7b9b20 | 1461 | |
1462 | ||
1463 | static void | |
564dd50a | 1464 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) |
1465 | { | |
1d7b9b20 | 1466 | line_fullname(li->line, last->ll_line, sizeof(li->line)); |
5abcdf8e | 1467 | strlcpy(li->hostname, last->ll_host, |
1468 | MIN_SIZEOF(li->hostname, last->ll_host)); | |
1d7b9b20 | 1469 | li->tv_sec = last->ll_time; |
564dd50a | 1470 | } |
1d7b9b20 | 1471 | |
1472 | ||
1473 | int | |
564dd50a | 1474 | lastlog_get_entry(struct logininfo *li) |
1475 | { | |
1d7b9b20 | 1476 | struct lastlog last; |
1477 | int fd; | |
1478 | ||
1479 | if (lastlog_openseek(li, &fd, O_RDONLY)) { | |
1480 | if ( read(fd, &last, sizeof(struct lastlog)) | |
1481 | != sizeof(struct lastlog) ) { | |
1482 | log("lastlog_write_filemode: Error reading from %s: %s", | |
1483 | LASTLOG_FILE, strerror(errno)); | |
1484 | return 0; | |
1485 | } else { | |
1486 | lastlog_populate_entry(li, &last); | |
1487 | return 1; | |
1488 | } | |
1d7b9b20 | 1489 | } else |
1490 | return 0; | |
564dd50a | 1491 | } |
1d7b9b20 | 1492 | |
1493 | ||
f988dce5 | 1494 | #endif /* USE_LASTLOG */ |