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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: | |
698d107e | 135 | ** homegrown ttyslot() |
564dd50a | 136 | ** test, test, test |
1d7b9b20 | 137 | ** |
138 | ** Platform status: | |
139 | ** ---------------- | |
140 | ** | |
141 | ** Known good: | |
698d107e | 142 | ** Linux (Redhat 6.2, Debian) |
143 | ** Solaris | |
1d7b9b20 | 144 | ** HP-UX 10.20 (gcc only) |
5abcdf8e | 145 | ** IRIX |
698d107e | 146 | ** NeXT - M68k/HPPA (4.2/3.3) |
1d7b9b20 | 147 | ** |
148 | ** Testing required: Please send reports! | |
1d7b9b20 | 149 | ** NetBSD |
150 | ** HP-UX 11 | |
a3cef3ca | 151 | ** AIX |
1d7b9b20 | 152 | ** |
153 | ** Platforms with known problems: | |
698d107e | 154 | ** Some variants of Slackware Linux |
1d7b9b20 | 155 | ** |
156 | **/ | |
157 | ||
158 | #include "includes.h" | |
159 | ||
1d7b9b20 | 160 | #include "ssh.h" |
161 | #include "xmalloc.h" | |
162 | #include "loginrec.h" | |
163 | ||
164 | RCSID("$Id$"); | |
165 | ||
1d7b9b20 | 166 | /** |
167 | ** prototypes for helper functions in this file | |
168 | **/ | |
169 | ||
170 | #if HAVE_UTMP_H | |
1d7b9b20 | 171 | void set_utmp_time(struct logininfo *li, struct utmp *ut); |
172 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
173 | #endif | |
174 | ||
175 | #ifdef HAVE_UTMPX_H | |
1d7b9b20 | 176 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); |
177 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
178 | #endif | |
179 | ||
180 | int utmp_write_entry(struct logininfo *li); | |
181 | int utmpx_write_entry(struct logininfo *li); | |
182 | int wtmp_write_entry(struct logininfo *li); | |
183 | int wtmpx_write_entry(struct logininfo *li); | |
184 | int lastlog_write_entry(struct logininfo *li); | |
185 | int syslogin_write_entry(struct logininfo *li); | |
186 | ||
187 | int getlast_entry(struct logininfo *li); | |
188 | int lastlog_get_entry(struct logininfo *li); | |
189 | int wtmp_get_entry(struct logininfo *li); | |
190 | int wtmpx_get_entry(struct logininfo *li); | |
191 | ||
5abcdf8e | 192 | /* pick the shortest string */ |
193 | #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) ) | |
194 | ||
1d7b9b20 | 195 | /** |
196 | ** platform-independent login functions | |
197 | **/ | |
198 | ||
5abcdf8e | 199 | /* login_login(struct logininfo *) -Record a login |
200 | * | |
201 | * Call with a pointer to a struct logininfo initialised with | |
202 | * login_init_entry() or login_alloc_entry() | |
203 | * | |
204 | * Returns: | |
205 | * >0 if successful | |
206 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
207 | */ | |
564dd50a | 208 | int |
209 | login_login (struct logininfo *li) | |
210 | { | |
211 | li->type = LTYPE_LOGIN; | |
212 | return login_write(li); | |
213 | } | |
1d7b9b20 | 214 | |
215 | ||
5abcdf8e | 216 | /* login_logout(struct logininfo *) - Record a logout |
217 | * | |
218 | * Call as with login_login() | |
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_logout(struct logininfo *li) | |
226 | { | |
227 | li->type = LTYPE_LOGOUT; | |
228 | return login_write(li); | |
1d7b9b20 | 229 | } |
230 | ||
5abcdf8e | 231 | /* login_get_lastlog_time(int) - Retrieve the last login time |
232 | * | |
233 | * Retrieve the last login time for the given uid. Will try to use the | |
234 | * system lastlog facilities if they are available, but will fall back | |
235 | * to looking in wtmp/wtmpx if necessary | |
236 | * | |
237 | * Returns: | |
238 | * 0 on failure, or if user has never logged in | |
239 | * Time in seconds from the epoch if successful | |
240 | * | |
241 | * Useful preprocessor symbols: | |
242 | * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog | |
243 | * info | |
244 | * USE_LASTLOG: If set, indicates the presence of system lastlog | |
245 | * facilities. If this and DISABLE_LASTLOG are not set, | |
246 | * try to retrieve lastlog information from wtmp/wtmpx. | |
247 | */ | |
564dd50a | 248 | unsigned int |
249 | login_get_lastlog_time(const int uid) | |
250 | { | |
251 | struct logininfo li; | |
1d7b9b20 | 252 | |
5abcdf8e | 253 | if (login_get_lastlog(&li, uid)) |
254 | return li.tv_sec; | |
255 | else | |
256 | return 0; | |
564dd50a | 257 | } |
1d7b9b20 | 258 | |
5abcdf8e | 259 | /* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry |
260 | * | |
261 | * Retrieve a logininfo structure populated (only partially) with | |
262 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
263 | * system lastlog information exists. | |
264 | * | |
265 | * Note this routine must be given a pre-allocated logininfo. | |
266 | * | |
267 | * Returns: | |
268 | * >0: A pointer to your struct logininfo if successful | |
269 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
270 | * | |
271 | */ | |
564dd50a | 272 | struct logininfo * |
273 | login_get_lastlog(struct logininfo *li, const int uid) | |
274 | { | |
5abcdf8e | 275 | struct passwd *pw; |
5abcdf8e | 276 | |
dbaa2e87 | 277 | memset(li, '\0', sizeof(*li)); |
1d7b9b20 | 278 | li->uid = uid; |
5abcdf8e | 279 | |
9f32ceb4 | 280 | /* |
281 | * If we don't have a 'real' lastlog, we need the username to | |
5abcdf8e | 282 | * reliably search wtmp(x) for the last login (see |
9f32ceb4 | 283 | * wtmp_get_entry().) |
284 | */ | |
5abcdf8e | 285 | pw = getpwuid(uid); |
a05a70ab | 286 | if (pw == NULL) |
287 | fatal("login_get_lastlog: Cannot find account for uid %i", uid); | |
288 | ||
1bfbb762 | 289 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the |
290 | * username */ | |
d8caae24 | 291 | strlcpy(li->username, pw->pw_name, sizeof(li->username)); |
a05a70ab | 292 | |
564dd50a | 293 | if (getlast_entry(li)) |
294 | return li; | |
295 | else | |
a05a70ab | 296 | return NULL; |
1d7b9b20 | 297 | } |
298 | ||
1d7b9b20 | 299 | |
5abcdf8e | 300 | /* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise |
301 | * a logininfo structure | |
302 | * | |
303 | * This function creates a new struct logininfo, a data structure | |
304 | * meant to carry the information required to portably record login info. | |
305 | * | |
306 | * Returns a pointer to a newly created struct logininfo. If memory | |
307 | * allocation fails, the program halts. | |
308 | */ | |
564dd50a | 309 | struct |
310 | logininfo *login_alloc_entry(int pid, const char *username, | |
311 | const char *hostname, const char *line) | |
312 | { | |
313 | struct logininfo *newli; | |
1d7b9b20 | 314 | |
dbaa2e87 | 315 | newli = (struct logininfo *) xmalloc (sizeof(*newli)); |
564dd50a | 316 | (void)login_init_entry(newli, pid, username, hostname, line); |
317 | return newli; | |
1d7b9b20 | 318 | } |
319 | ||
320 | ||
5abcdf8e | 321 | /* login_free_entry(struct logininfo *) - free struct memory */ |
1d7b9b20 | 322 | void |
564dd50a | 323 | login_free_entry(struct logininfo *li) |
324 | { | |
325 | xfree(li); | |
1d7b9b20 | 326 | } |
327 | ||
328 | ||
5abcdf8e | 329 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) |
330 | * - initialise a struct logininfo | |
331 | * | |
332 | * Populates a new struct logininfo, a data structure meant to carry | |
333 | * the information required to portably record login info. | |
334 | * | |
335 | * Returns: 1 | |
336 | */ | |
564dd50a | 337 | int |
338 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
339 | const char *hostname, const char *line) | |
340 | { | |
d8caae24 | 341 | struct passwd *pw; |
342 | ||
dbaa2e87 | 343 | memset(li, 0, sizeof(*li)); |
564dd50a | 344 | |
345 | li->pid = pid; | |
d8caae24 | 346 | |
564dd50a | 347 | /* set the line information */ |
348 | if (line) | |
349 | line_fullname(li->line, line, sizeof(li->line)); | |
1d7b9b20 | 350 | |
d8caae24 | 351 | if (username) { |
564dd50a | 352 | strlcpy(li->username, username, sizeof(li->username)); |
d8caae24 | 353 | pw = getpwnam(li->username); |
354 | if (pw == NULL) | |
355 | fatal("login_init_entry: Cannot find user \"%s\"", li->username); | |
356 | li->uid = pw->pw_uid; | |
357 | } | |
a05a70ab | 358 | |
564dd50a | 359 | if (hostname) |
360 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
d8caae24 | 361 | |
564dd50a | 362 | return 1; |
1d7b9b20 | 363 | } |
364 | ||
5abcdf8e | 365 | /* login_set_current_time(struct logininfo *) - set the current time |
366 | * | |
367 | * Set the current time in a logininfo structure. This function is | |
368 | * meant to eliminate the need to deal with system dependencies for | |
369 | * time handling. | |
370 | */ | |
1d7b9b20 | 371 | void |
564dd50a | 372 | login_set_current_time(struct logininfo *li) |
373 | { | |
1d7b9b20 | 374 | struct timeval tv; |
375 | ||
376 | gettimeofday(&tv, NULL); | |
d8caae24 | 377 | |
378 | li->tv_sec = tv.tv_sec; | |
379 | li->tv_usec = tv.tv_usec; | |
1d7b9b20 | 380 | } |
381 | ||
564dd50a | 382 | /* copy a sockaddr_* into our logininfo */ |
1d7b9b20 | 383 | void |
564dd50a | 384 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, |
385 | const unsigned int sa_size) | |
386 | { | |
387 | unsigned int bufsize = sa_size; | |
388 | ||
389 | /* make sure we don't overrun our union */ | |
390 | if (sizeof(li->hostaddr) < sa_size) | |
391 | bufsize = sizeof(li->hostaddr); | |
392 | ||
393 | memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize); | |
1d7b9b20 | 394 | } |
1d7b9b20 | 395 | |
564dd50a | 396 | |
397 | /** | |
398 | ** login_write: Call low-level recording functions based on autoconf | |
399 | ** results | |
400 | **/ | |
1d7b9b20 | 401 | int |
564dd50a | 402 | login_write (struct logininfo *li) |
403 | { | |
3c62e7eb | 404 | #ifndef HAVE_CYGWIN |
1d7b9b20 | 405 | if ((int)geteuid() != 0) { |
406 | log("Attempt to write login records by non-root user (aborting)"); | |
407 | return 1; | |
408 | } | |
3c62e7eb | 409 | #endif |
a05a70ab | 410 | |
1d7b9b20 | 411 | /* set the timestamp */ |
412 | login_set_current_time(li); | |
413 | #ifdef USE_LOGIN | |
414 | syslogin_write_entry(li); | |
415 | #endif | |
416 | #ifdef USE_LASTLOG | |
417 | if (li->type == LTYPE_LOGIN) { | |
418 | lastlog_write_entry(li); | |
419 | } | |
420 | #endif | |
421 | #ifdef USE_UTMP | |
422 | utmp_write_entry(li); | |
423 | #endif | |
424 | #ifdef USE_WTMP | |
425 | wtmp_write_entry(li); | |
426 | #endif | |
427 | #ifdef USE_UTMPX | |
428 | utmpx_write_entry(li); | |
429 | #endif | |
430 | #ifdef USE_WTMPX | |
431 | wtmpx_write_entry(li); | |
432 | #endif | |
433 | return 0; | |
434 | } | |
435 | ||
564dd50a | 436 | /** |
437 | ** getlast_entry: Call low-level functions to retrieve the last login | |
438 | ** time. | |
439 | **/ | |
1d7b9b20 | 440 | |
564dd50a | 441 | /* take the uid in li and return the last login time */ |
1d7b9b20 | 442 | int |
564dd50a | 443 | getlast_entry(struct logininfo *li) |
444 | { | |
445 | #ifdef USE_LASTLOG | |
9f32ceb4 | 446 | return(lastlog_get_entry(li)); |
a05a70ab | 447 | #else /* !USE_LASTLOG */ |
1d7b9b20 | 448 | |
a05a70ab | 449 | #ifdef DISABLE_LASTLOG |
3f45f1c3 | 450 | /* On some systems we shouldn't even try to obtain last login |
451 | * time, e.g. AIX */ | |
452 | return 0; | |
a05a70ab | 453 | # else /* DISABLE_LASTLOG */ |
564dd50a | 454 | /* Try to retrieve the last login time from wtmp */ |
a05a70ab | 455 | # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) |
564dd50a | 456 | /* retrieve last login time from utmp */ |
a05a70ab | 457 | return (wtmp_get_entry(li)); |
458 | # else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */ | |
564dd50a | 459 | /* If wtmp isn't available, try wtmpx */ |
a05a70ab | 460 | # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) |
564dd50a | 461 | /* retrieve last login time from utmpx */ |
a05a70ab | 462 | return (wtmpx_get_entry(li)); |
463 | # else | |
564dd50a | 464 | /* Give up: No means of retrieving last login time */ |
465 | return 0; | |
a05a70ab | 466 | # endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */ |
467 | # endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */ | |
468 | # endif /* DISABLE_LASTLOG */ | |
469 | #endif /* USE_LASTLOG */ | |
564dd50a | 470 | } |
1d7b9b20 | 471 | |
472 | ||
1d7b9b20 | 473 | |
474 | /* | |
564dd50a | 475 | * 'line' string utility functions |
476 | * | |
477 | * These functions process the 'line' string into one of three forms: | |
478 | * | |
1d7b9b20 | 479 | * 1. The full filename (including '/dev') |
480 | * 2. The stripped name (excluding '/dev') | |
564dd50a | 481 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 |
482 | * /dev/pts/1 -> ts/1 ) | |
1d7b9b20 | 483 | * |
484 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
485 | * attempting to remove it. Typically both addition and removal is | |
564dd50a | 486 | * performed by one application - say, sshd - so as long as the choice |
487 | * uniquely identifies a terminal it's ok. | |
1d7b9b20 | 488 | */ |
489 | ||
490 | ||
564dd50a | 491 | /* line_fullname(): add the leading '/dev/' if it doesn't exist make |
492 | * sure dst has enough space, if not just copy src (ugh) */ | |
1d7b9b20 | 493 | char * |
564dd50a | 494 | line_fullname(char *dst, const char *src, int dstsize) |
495 | { | |
1d7b9b20 | 496 | memset(dst, '\0', dstsize); |
497 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) | |
498 | strlcpy(dst, src, dstsize); | |
499 | else { | |
a4d05724 | 500 | strlcpy(dst, "/dev/", dstsize); |
1d7b9b20 | 501 | strlcat(dst, src, dstsize); |
502 | } | |
503 | return dst; | |
504 | } | |
505 | ||
564dd50a | 506 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ |
1d7b9b20 | 507 | char * |
564dd50a | 508 | line_stripname(char *dst, const char *src, int dstsize) |
509 | { | |
1d7b9b20 | 510 | memset(dst, '\0', dstsize); |
511 | if (strncmp(src, "/dev/", 5) == 0) | |
512 | strlcpy(dst, &src[5], dstsize); | |
513 | else | |
514 | strlcpy(dst, src, dstsize); | |
515 | return dst; | |
564dd50a | 516 | } |
517 | ||
564dd50a | 518 | /* line_abbrevname(): Return the abbreviated (usually four-character) |
519 | * form of the line (Just use the last <dstsize> characters of the | |
520 | * full name.) | |
521 | * | |
522 | * NOTE: use strncpy because we do NOT necessarily want zero | |
523 | * termination */ | |
1d7b9b20 | 524 | char * |
a05a70ab | 525 | line_abbrevname(char *dst, const char *src, int dstsize) |
526 | { | |
527 | size_t len; | |
528 | ||
1d7b9b20 | 529 | memset(dst, '\0', dstsize); |
a05a70ab | 530 | |
daaff4d5 | 531 | /* Always skip prefix if present */ |
532 | if (strncmp(src, "/dev/", 5) == 0) | |
533 | src += 5; | |
534 | ||
a05a70ab | 535 | len = strlen(src); |
536 | ||
daaff4d5 | 537 | if (len > 0) { |
538 | if (((int)len - dstsize) > 0) | |
539 | src += ((int)len - dstsize); | |
540 | ||
541 | /* note: _don't_ change this to strlcpy */ | |
542 | strncpy(dst, src, (size_t)dstsize); | |
a05a70ab | 543 | } |
544 | ||
1d7b9b20 | 545 | return dst; |
546 | } | |
547 | ||
1d7b9b20 | 548 | /** |
549 | ** utmp utility functions | |
564dd50a | 550 | ** |
551 | ** These functions manipulate struct utmp, taking system differences | |
552 | ** into account. | |
1d7b9b20 | 553 | **/ |
554 | ||
555 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
556 | ||
1d7b9b20 | 557 | /* build the utmp structure */ |
558 | void | |
564dd50a | 559 | set_utmp_time(struct logininfo *li, struct utmp *ut) |
560 | { | |
a05a70ab | 561 | # ifdef HAVE_TV_IN_UTMP |
1d7b9b20 | 562 | ut->ut_tv.tv_sec = li->tv_sec; |
563 | ut->ut_tv.tv_usec = li->tv_usec; | |
a05a70ab | 564 | # else |
1d7b9b20 | 565 | # ifdef HAVE_TIME_IN_UTMP |
566 | ut->ut_time = li->tv_sec; | |
567 | # endif | |
a05a70ab | 568 | # endif |
1d7b9b20 | 569 | } |
570 | ||
571 | void | |
572 | construct_utmp(struct logininfo *li, | |
564dd50a | 573 | struct utmp *ut) |
574 | { | |
dbaa2e87 | 575 | memset(ut, '\0', sizeof(*ut)); |
5abcdf8e | 576 | |
577 | /* First fill out fields used for both logins and logouts */ | |
578 | ||
a05a70ab | 579 | # ifdef HAVE_ID_IN_UTMP |
1d7b9b20 | 580 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); |
a05a70ab | 581 | # endif |
1d7b9b20 | 582 | |
a05a70ab | 583 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 584 | /* This is done here to keep utmp constants out of struct logininfo */ |
1d7b9b20 | 585 | switch (li->type) { |
586 | case LTYPE_LOGIN: | |
587 | ut->ut_type = USER_PROCESS; | |
588 | break; | |
589 | case LTYPE_LOGOUT: | |
590 | ut->ut_type = DEAD_PROCESS; | |
591 | break; | |
592 | } | |
a05a70ab | 593 | # endif |
5abcdf8e | 594 | set_utmp_time(li, ut); |
1d7b9b20 | 595 | |
5abcdf8e | 596 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); |
a05a70ab | 597 | |
598 | # ifdef HAVE_PID_IN_UTMP | |
1d7b9b20 | 599 | ut->ut_pid = li->pid; |
a05a70ab | 600 | # endif |
5abcdf8e | 601 | |
602 | /* If we're logging out, leave all other fields blank */ | |
603 | if (li->type == LTYPE_LOGOUT) | |
604 | return; | |
605 | ||
a05a70ab | 606 | /* |
607 | * These fields are only used when logging in, and are blank | |
608 | * for logouts. | |
609 | */ | |
5abcdf8e | 610 | |
611 | /* Use strncpy because we don't necessarily want null termination */ | |
dc2a6d09 | 612 | strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username)); |
a05a70ab | 613 | # ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 614 | strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname)); |
a05a70ab | 615 | # endif |
616 | # ifdef HAVE_ADDR_IN_UTMP | |
564dd50a | 617 | /* this is just a 32-bit IP address */ |
618 | if (li->hostaddr.sa.sa_family == AF_INET) | |
619 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
a05a70ab | 620 | # endif |
564dd50a | 621 | } |
a05a70ab | 622 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ |
564dd50a | 623 | |
1d7b9b20 | 624 | /** |
625 | ** utmpx utility functions | |
564dd50a | 626 | ** |
627 | ** These functions manipulate struct utmpx, accounting for system | |
628 | ** variations. | |
1d7b9b20 | 629 | **/ |
630 | ||
631 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
1d7b9b20 | 632 | /* build the utmpx structure */ |
633 | void | |
564dd50a | 634 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) |
635 | { | |
a05a70ab | 636 | # ifdef HAVE_TV_IN_UTMPX |
1d7b9b20 | 637 | utx->ut_tv.tv_sec = li->tv_sec; |
638 | utx->ut_tv.tv_usec = li->tv_usec; | |
a05a70ab | 639 | # else /* HAVE_TV_IN_UTMPX */ |
1d7b9b20 | 640 | # ifdef HAVE_TIME_IN_UTMPX |
641 | utx->ut_time = li->tv_sec; | |
a05a70ab | 642 | # endif /* HAVE_TIME_IN_UTMPX */ |
643 | # endif /* HAVE_TV_IN_UTMPX */ | |
1d7b9b20 | 644 | } |
645 | ||
646 | void | |
564dd50a | 647 | construct_utmpx(struct logininfo *li, struct utmpx *utx) |
648 | { | |
dbaa2e87 | 649 | memset(utx, '\0', sizeof(*utx)); |
daaff4d5 | 650 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 651 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); |
daaff4d5 | 652 | # endif |
1d7b9b20 | 653 | |
654 | /* this is done here to keep utmp constants out of loginrec.h */ | |
655 | switch (li->type) { | |
656 | case LTYPE_LOGIN: | |
657 | utx->ut_type = USER_PROCESS; | |
658 | break; | |
659 | case LTYPE_LOGOUT: | |
660 | utx->ut_type = DEAD_PROCESS; | |
661 | break; | |
662 | } | |
1d7b9b20 | 663 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); |
1d7b9b20 | 664 | set_utmpx_time(li, utx); |
5abcdf8e | 665 | utx->ut_pid = li->pid; |
666 | ||
667 | if (li->type == LTYPE_LOGOUT) | |
668 | return; | |
669 | ||
a05a70ab | 670 | /* |
671 | * These fields are only used when logging in, and are blank | |
672 | * for logouts. | |
673 | */ | |
5abcdf8e | 674 | |
675 | /* strncpy(): Don't necessarily want null termination */ | |
dc2a6d09 | 676 | strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username)); |
a05a70ab | 677 | # ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 678 | strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname)); |
a05a70ab | 679 | # endif |
680 | # ifdef HAVE_ADDR_IN_UTMPX | |
764d4113 | 681 | /* this is just a 32-bit IP address */ |
682 | if (li->hostaddr.sa.sa_family == AF_INET) | |
683 | utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
a05a70ab | 684 | # endif |
685 | # ifdef HAVE_SYSLEN_IN_UTMPX | |
5abcdf8e | 686 | /* ut_syslen is the length of the utx_host string */ |
687 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
a05a70ab | 688 | # endif |
564dd50a | 689 | } |
a05a70ab | 690 | #endif /* USE_UTMPX || USE_WTMPX */ |
1d7b9b20 | 691 | |
692 | /** | |
564dd50a | 693 | ** Low-level utmp functions |
1d7b9b20 | 694 | **/ |
695 | ||
696 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
1d7b9b20 | 697 | #ifdef USE_UTMP |
698 | ||
1d7b9b20 | 699 | /* if we can, use pututline() etc. */ |
a05a70ab | 700 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ |
701 | defined(HAVE_PUTUTLINE) | |
1d7b9b20 | 702 | # define UTMP_USE_LIBRARY |
a05a70ab | 703 | # endif |
1d7b9b20 | 704 | |
705 | ||
706 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
a05a70ab | 707 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 708 | static int |
564dd50a | 709 | utmp_write_library(struct logininfo *li, struct utmp *ut) |
710 | { | |
1d7b9b20 | 711 | setutent(); |
712 | pututline(ut); | |
713 | ||
a05a70ab | 714 | # ifdef HAVE_ENDUTENT |
1d7b9b20 | 715 | endutent(); |
a05a70ab | 716 | # endif |
1d7b9b20 | 717 | return 1; |
564dd50a | 718 | } |
a05a70ab | 719 | # else /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 720 | |
721 | /* write a utmp entry direct to the file */ | |
564dd50a | 722 | /* This is a slightly modification of code in OpenBSD's login.c */ |
1d7b9b20 | 723 | static int |
564dd50a | 724 | utmp_write_direct(struct logininfo *li, struct utmp *ut) |
725 | { | |
1d7b9b20 | 726 | struct utmp old_ut; |
727 | register int fd; | |
728 | int tty; | |
729 | ||
5abcdf8e | 730 | /* FIXME: (ATL) ttyslot() needs local implementation */ |
dbaa2e87 | 731 | |
698d107e | 732 | #if defined(HAVE_GETTTYENT) |
dbaa2e87 | 733 | register struct ttyent *ty; |
734 | ||
735 | tty=0; | |
736 | ||
737 | setttyent(); | |
738 | while ((struct ttyent *)0 != (ty = getttyent())) { | |
739 | tty++; | |
740 | if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) | |
741 | break; | |
742 | } | |
743 | endttyent(); | |
744 | ||
745 | if((struct ttyent *)0 == ty) { | |
746 | log("utmp_write_entry: tty not found"); | |
747 | return(1); | |
748 | } | |
749 | #else /* FIXME */ | |
750 | ||
1d7b9b20 | 751 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ |
752 | ||
698d107e | 753 | #endif /* HAVE_GETTTYENT */ |
dbaa2e87 | 754 | |
1d7b9b20 | 755 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { |
756 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
757 | /* | |
758 | * Prevent luser from zero'ing out ut_host. | |
759 | * If the new ut_line is empty but the old one is not | |
dc2a6d09 | 760 | * and ut_line and ut_name match, preserve the old ut_line. |
1d7b9b20 | 761 | */ |
9f32ceb4 | 762 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && |
763 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && | |
764 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
dc2a6d09 | 765 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) { |
1d7b9b20 | 766 | (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); |
9f32ceb4 | 767 | } |
768 | ||
1d7b9b20 | 769 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); |
32eec038 | 770 | if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) |
1d7b9b20 | 771 | log("utmp_write_direct: error writing %s: %s", |
5abcdf8e | 772 | UTMP_FILE, strerror(errno)); |
1d7b9b20 | 773 | |
774 | (void)close(fd); | |
775 | return 1; | |
9f32ceb4 | 776 | } else { |
1d7b9b20 | 777 | return 0; |
9f32ceb4 | 778 | } |
564dd50a | 779 | } |
a05a70ab | 780 | # endif /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 781 | |
782 | static int | |
564dd50a | 783 | utmp_perform_login(struct logininfo *li) |
784 | { | |
1d7b9b20 | 785 | struct utmp ut; |
786 | ||
787 | construct_utmp(li, &ut); | |
a05a70ab | 788 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 789 | if (!utmp_write_library(li, &ut)) { |
5abcdf8e | 790 | log("utmp_perform_login: utmp_write_library() failed"); |
1d7b9b20 | 791 | return 0; |
792 | } | |
a05a70ab | 793 | # else |
1d7b9b20 | 794 | if (!utmp_write_direct(li, &ut)) { |
795 | log("utmp_perform_login: utmp_write_direct() failed"); | |
796 | return 0; | |
797 | } | |
a05a70ab | 798 | # endif |
1d7b9b20 | 799 | return 1; |
564dd50a | 800 | } |
1d7b9b20 | 801 | |
802 | ||
803 | static int | |
564dd50a | 804 | utmp_perform_logout(struct logininfo *li) |
805 | { | |
1d7b9b20 | 806 | struct utmp ut; |
807 | ||
5abcdf8e | 808 | construct_utmp(li, &ut); |
a05a70ab | 809 | # ifdef UTMP_USE_LIBRARY |
5abcdf8e | 810 | if (!utmp_write_library(li, &ut)) { |
811 | log("utmp_perform_logout: utmp_write_library() failed"); | |
812 | return 0; | |
813 | } | |
a05a70ab | 814 | # else |
5abcdf8e | 815 | if (!utmp_write_direct(li, &ut)) { |
816 | log("utmp_perform_logout: utmp_write_direct() failed"); | |
817 | return 0; | |
818 | } | |
a05a70ab | 819 | # endif |
1d7b9b20 | 820 | return 1; |
564dd50a | 821 | } |
1d7b9b20 | 822 | |
823 | ||
824 | int | |
564dd50a | 825 | utmp_write_entry(struct logininfo *li) |
826 | { | |
1d7b9b20 | 827 | switch(li->type) { |
828 | case LTYPE_LOGIN: | |
829 | return utmp_perform_login(li); | |
830 | ||
831 | case LTYPE_LOGOUT: | |
832 | return utmp_perform_logout(li); | |
833 | ||
834 | default: | |
835 | log("utmp_write_entry: invalid type field"); | |
836 | return 0; | |
837 | } | |
564dd50a | 838 | } |
a05a70ab | 839 | #endif /* USE_UTMP */ |
1d7b9b20 | 840 | |
841 | ||
842 | /** | |
564dd50a | 843 | ** Low-level utmpx functions |
1d7b9b20 | 844 | **/ |
845 | ||
846 | /* not much point if we don't want utmpx entries */ | |
847 | #ifdef USE_UTMPX | |
848 | ||
1d7b9b20 | 849 | /* if we have the wherewithall, use pututxline etc. */ |
a05a70ab | 850 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ |
851 | defined(HAVE_PUTUTXLINE) | |
1d7b9b20 | 852 | # define UTMPX_USE_LIBRARY |
a05a70ab | 853 | # endif |
1d7b9b20 | 854 | |
855 | ||
856 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
a05a70ab | 857 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 858 | static int |
564dd50a | 859 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) |
860 | { | |
1d7b9b20 | 861 | setutxent(); |
862 | pututxline(utx); | |
863 | ||
a05a70ab | 864 | # ifdef HAVE_ENDUTXENT |
1d7b9b20 | 865 | endutxent(); |
a05a70ab | 866 | # endif |
1d7b9b20 | 867 | return 1; |
564dd50a | 868 | } |
1d7b9b20 | 869 | |
a05a70ab | 870 | # else /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 871 | |
872 | /* write a utmp entry direct to the file */ | |
873 | static int | |
564dd50a | 874 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) |
875 | { | |
1d7b9b20 | 876 | log("utmpx_write_direct: not implemented!"); |
877 | return 0; | |
564dd50a | 878 | } |
a05a70ab | 879 | # endif /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 880 | |
881 | static int | |
564dd50a | 882 | utmpx_perform_login(struct logininfo *li) |
883 | { | |
1d7b9b20 | 884 | struct utmpx utx; |
885 | ||
886 | construct_utmpx(li, &utx); | |
a05a70ab | 887 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 888 | if (!utmpx_write_library(li, &utx)) { |
889 | log("utmpx_perform_login: utmp_write_library() failed"); | |
890 | return 0; | |
891 | } | |
a05a70ab | 892 | # else |
1d7b9b20 | 893 | if (!utmpx_write_direct(li, &ut)) { |
894 | log("utmpx_perform_login: utmp_write_direct() failed"); | |
895 | return 0; | |
896 | } | |
a05a70ab | 897 | # endif |
1d7b9b20 | 898 | return 1; |
564dd50a | 899 | } |
1d7b9b20 | 900 | |
901 | ||
902 | static int | |
564dd50a | 903 | utmpx_perform_logout(struct logininfo *li) |
904 | { | |
1d7b9b20 | 905 | struct utmpx utx; |
906 | ||
907 | memset(&utx, '\0', sizeof(utx)); | |
908 | set_utmpx_time(li, &utx); | |
909 | line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line)); | |
a05a70ab | 910 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 911 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); |
a05a70ab | 912 | # endif |
913 | # ifdef HAVE_TYPE_IN_UTMPX | |
1d7b9b20 | 914 | utx.ut_type = DEAD_PROCESS; |
a05a70ab | 915 | # endif |
1d7b9b20 | 916 | |
a05a70ab | 917 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 918 | utmpx_write_library(li, &utx); |
a05a70ab | 919 | # else |
1d7b9b20 | 920 | utmpx_write_direct(li, &utx); |
a05a70ab | 921 | # endif |
1d7b9b20 | 922 | return 1; |
564dd50a | 923 | } |
1d7b9b20 | 924 | |
1d7b9b20 | 925 | int |
564dd50a | 926 | utmpx_write_entry(struct logininfo *li) |
927 | { | |
1d7b9b20 | 928 | switch(li->type) { |
929 | case LTYPE_LOGIN: | |
930 | return utmpx_perform_login(li); | |
931 | case LTYPE_LOGOUT: | |
932 | return utmpx_perform_logout(li); | |
933 | default: | |
934 | log("utmpx_write_entry: invalid type field"); | |
935 | return 0; | |
936 | } | |
564dd50a | 937 | } |
a05a70ab | 938 | #endif /* USE_UTMPX */ |
1d7b9b20 | 939 | |
940 | ||
941 | /** | |
564dd50a | 942 | ** Low-level wtmp functions |
1d7b9b20 | 943 | **/ |
944 | ||
945 | #ifdef USE_WTMP | |
946 | ||
1d7b9b20 | 947 | /* write a wtmp entry direct to the end of the file */ |
564dd50a | 948 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 949 | static int |
564dd50a | 950 | wtmp_write(struct logininfo *li, struct utmp *ut) |
951 | { | |
1d7b9b20 | 952 | struct stat buf; |
953 | int fd, ret = 1; | |
954 | ||
955 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
956 | log("wtmp_write: problem writing %s: %s", | |
957 | WTMP_FILE, strerror(errno)); | |
958 | return 0; | |
959 | } | |
564dd50a | 960 | if (fstat(fd, &buf) == 0) |
9f32ceb4 | 961 | if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) { |
1d7b9b20 | 962 | ftruncate(fd, buf.st_size); |
963 | log("wtmp_write: problem writing %s: %s", | |
964 | WTMP_FILE, strerror(errno)); | |
965 | ret = 0; | |
966 | } | |
967 | (void)close(fd); | |
1d7b9b20 | 968 | return ret; |
564dd50a | 969 | } |
1d7b9b20 | 970 | |
1d7b9b20 | 971 | static int |
a05a70ab | 972 | wtmp_perform_login(struct logininfo *li) |
973 | { | |
1d7b9b20 | 974 | struct utmp ut; |
975 | ||
976 | construct_utmp(li, &ut); | |
977 | return wtmp_write(li, &ut); | |
564dd50a | 978 | } |
1d7b9b20 | 979 | |
980 | ||
981 | static int | |
564dd50a | 982 | wtmp_perform_logout(struct logininfo *li) |
983 | { | |
1d7b9b20 | 984 | struct utmp ut; |
985 | ||
986 | construct_utmp(li, &ut); | |
1d7b9b20 | 987 | return wtmp_write(li, &ut); |
564dd50a | 988 | } |
1d7b9b20 | 989 | |
990 | ||
991 | int | |
564dd50a | 992 | wtmp_write_entry(struct logininfo *li) |
993 | { | |
1d7b9b20 | 994 | switch(li->type) { |
995 | case LTYPE_LOGIN: | |
996 | return wtmp_perform_login(li); | |
997 | case LTYPE_LOGOUT: | |
998 | return wtmp_perform_logout(li); | |
999 | default: | |
1000 | log("wtmp_write_entry: invalid type field"); | |
1001 | return 0; | |
1002 | } | |
564dd50a | 1003 | } |
1d7b9b20 | 1004 | |
1005 | ||
5abcdf8e | 1006 | /* Notes on fetching login data from wtmp/wtmpx |
1007 | * | |
1008 | * Logouts are usually recorded with (amongst other things) a blank | |
1009 | * username on a given tty line. However, some systems (HP-UX is one) | |
1010 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1011 | * | |
1012 | * Since we're only looking for logins here, we know that the username | |
1013 | * must be set correctly. On systems that leave it in, we check for | |
1014 | * ut_type==USER_PROCESS (indicating a login.) | |
1015 | * | |
1016 | * Portability: Some systems may set something other than USER_PROCESS | |
1017 | * to indicate a login process. I don't know of any as I write. Also, | |
1018 | * it's possible that some systems may both leave the username in | |
1019 | * place and not have ut_type. | |
1020 | */ | |
1021 | ||
5abcdf8e | 1022 | /* return true if this wtmp entry indicates a login */ |
1023 | static int | |
1024 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1025 | { | |
dc2a6d09 | 1026 | if (strncmp(li->username, ut->ut_name, |
1027 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { | |
a05a70ab | 1028 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 1029 | if (ut->ut_type & USER_PROCESS) |
1030 | return 1; | |
a05a70ab | 1031 | # else |
5abcdf8e | 1032 | return 1; |
a05a70ab | 1033 | # endif |
5abcdf8e | 1034 | } |
1035 | return 0; | |
1036 | } | |
1037 | ||
1d7b9b20 | 1038 | int |
564dd50a | 1039 | wtmp_get_entry(struct logininfo *li) |
1040 | { | |
1d7b9b20 | 1041 | struct stat st; |
1042 | struct utmp ut; | |
5abcdf8e | 1043 | int fd, found=0; |
1044 | ||
1045 | /* Clear the time entries in our logininfo */ | |
1046 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1047 | |
1048 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
1049 | log("wtmp_get_entry: problem opening %s: %s", | |
1050 | WTMP_FILE, strerror(errno)); | |
1051 | return 0; | |
1052 | } | |
564dd50a | 1053 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1054 | log("wtmp_get_entry: couldn't stat %s: %s", |
1055 | WTMP_FILE, strerror(errno)); | |
1056 | close(fd); | |
1057 | return 0; | |
1058 | } | |
1d7b9b20 | 1059 | |
5abcdf8e | 1060 | /* Seek to the start of the last struct utmp */ |
dbaa2e87 | 1061 | if (lseek(fd, (off_t)(0 - sizeof(struct utmp)), SEEK_END) == -1) { |
5abcdf8e | 1062 | /* Looks like we've got a fresh wtmp file */ |
1063 | close(fd); | |
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | while (!found) { | |
9f32ceb4 | 1068 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { |
1d7b9b20 | 1069 | log("wtmp_get_entry: read of %s failed: %s", |
1070 | WTMP_FILE, strerror(errno)); | |
1071 | close (fd); | |
1072 | return 0; | |
1073 | } | |
5abcdf8e | 1074 | if ( wtmp_islogin(li, &ut) ) { |
1075 | found = 1; | |
1076 | /* We've already checked for a time in struct | |
1077 | * utmp, in login_getlast(). */ | |
a05a70ab | 1078 | # ifdef HAVE_TIME_IN_UTMP |
1d7b9b20 | 1079 | li->tv_sec = ut.ut_time; |
a05a70ab | 1080 | # else |
1d7b9b20 | 1081 | # if HAVE_TV_IN_UTMP |
1082 | li->tv_sec = ut.ut_tv.tv_sec; | |
1083 | # endif | |
a05a70ab | 1084 | # endif |
5abcdf8e | 1085 | line_fullname(li->line, ut.ut_line, |
1086 | MIN_SIZEOF(li->line, ut.ut_line)); | |
a05a70ab | 1087 | # ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 1088 | strlcpy(li->hostname, ut.ut_host, |
1089 | MIN_SIZEOF(li->hostname, ut.ut_host)); | |
a05a70ab | 1090 | # endif |
5abcdf8e | 1091 | continue; |
1d7b9b20 | 1092 | } |
5abcdf8e | 1093 | /* Seek back 2 x struct utmp */ |
1d7b9b20 | 1094 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) { |
5abcdf8e | 1095 | /* We've found the start of the file, so quit */ |
1d7b9b20 | 1096 | close (fd); |
1097 | return 0; | |
1098 | } | |
5abcdf8e | 1099 | } |
1100 | ||
1101 | /* We found an entry. Tidy up and return */ | |
1102 | close(fd); | |
1d7b9b20 | 1103 | return 1; |
564dd50a | 1104 | } |
a05a70ab | 1105 | # endif /* USE_WTMP */ |
1d7b9b20 | 1106 | |
1107 | ||
1108 | /** | |
564dd50a | 1109 | ** Low-level wtmpx functions |
1d7b9b20 | 1110 | **/ |
1111 | ||
1112 | #ifdef USE_WTMPX | |
1d7b9b20 | 1113 | /* write a wtmpx entry direct to the end of the file */ |
564dd50a | 1114 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 1115 | static int |
564dd50a | 1116 | wtmpx_write(struct logininfo *li, struct utmpx *utx) |
1117 | { | |
1d7b9b20 | 1118 | struct stat buf; |
1119 | int fd, ret = 1; | |
1120 | ||
1121 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1122 | log("wtmpx_write: problem opening %s: %s", | |
1123 | WTMPX_FILE, strerror(errno)); | |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | if (fstat(fd, &buf) == 0) | |
9f32ceb4 | 1128 | if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) { |
1d7b9b20 | 1129 | ftruncate(fd, buf.st_size); |
1130 | log("wtmpx_write: problem writing %s: %s", | |
1131 | WTMPX_FILE, strerror(errno)); | |
1132 | ret = 0; | |
1133 | } | |
1134 | (void)close(fd); | |
1135 | ||
1136 | return ret; | |
564dd50a | 1137 | } |
1d7b9b20 | 1138 | |
1139 | ||
1140 | static int | |
564dd50a | 1141 | wtmpx_perform_login(struct logininfo *li) |
1142 | { | |
1d7b9b20 | 1143 | struct utmpx utx; |
1144 | ||
1145 | construct_utmpx(li, &utx); | |
1146 | return wtmpx_write(li, &utx); | |
564dd50a | 1147 | } |
1d7b9b20 | 1148 | |
1149 | ||
1150 | static int | |
564dd50a | 1151 | wtmpx_perform_logout(struct logininfo *li) |
1152 | { | |
1d7b9b20 | 1153 | struct utmpx utx; |
1154 | ||
1155 | construct_utmpx(li, &utx); | |
1d7b9b20 | 1156 | return wtmpx_write(li, &utx); |
564dd50a | 1157 | } |
1d7b9b20 | 1158 | |
1159 | ||
1160 | int | |
564dd50a | 1161 | wtmpx_write_entry(struct logininfo *li) |
1162 | { | |
1d7b9b20 | 1163 | switch(li->type) { |
1164 | case LTYPE_LOGIN: | |
1165 | return wtmpx_perform_login(li); | |
1166 | case LTYPE_LOGOUT: | |
1167 | return wtmpx_perform_logout(li); | |
1168 | default: | |
1169 | log("wtmpx_write_entry: invalid type field"); | |
1170 | return 0; | |
1171 | } | |
564dd50a | 1172 | } |
1d7b9b20 | 1173 | |
5abcdf8e | 1174 | /* Please see the notes above wtmp_islogin() for information about the |
1175 | next two functions */ | |
1176 | ||
1177 | /* Return true if this wtmpx entry indicates a login */ | |
1178 | static int | |
1179 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1180 | { | |
dc2a6d09 | 1181 | if ( strncmp(li->username, utx->ut_name, |
1182 | MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) { | |
a05a70ab | 1183 | # ifdef HAVE_TYPE_IN_UTMPX |
5abcdf8e | 1184 | if (utx->ut_type == USER_PROCESS) |
1185 | return 1; | |
a05a70ab | 1186 | # else |
5abcdf8e | 1187 | return 1; |
a05a70ab | 1188 | # endif |
5abcdf8e | 1189 | } |
1190 | return 0; | |
1191 | } | |
1192 | ||
1d7b9b20 | 1193 | |
1194 | int | |
564dd50a | 1195 | wtmpx_get_entry(struct logininfo *li) |
1196 | { | |
1d7b9b20 | 1197 | struct stat st; |
1198 | struct utmpx utx; | |
5abcdf8e | 1199 | int fd, found=0; |
1200 | ||
1201 | /* Clear the time entries */ | |
1202 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1203 | |
1204 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1205 | log("wtmpx_get_entry: problem opening %s: %s", | |
1206 | WTMPX_FILE, strerror(errno)); | |
1207 | return 0; | |
1208 | } | |
564dd50a | 1209 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1210 | log("wtmpx_get_entry: couldn't stat %s: %s", |
1211 | WTMP_FILE, strerror(errno)); | |
1212 | close(fd); | |
1213 | return 0; | |
1214 | } | |
5abcdf8e | 1215 | |
1216 | /* Seek to the start of the last struct utmpx */ | |
1217 | if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) { | |
1218 | /* probably a newly rotated wtmpx file */ | |
1219 | close(fd); | |
1220 | return 0; | |
1221 | } | |
1d7b9b20 | 1222 | |
5abcdf8e | 1223 | while (!found) { |
9f32ceb4 | 1224 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { |
1d7b9b20 | 1225 | log("wtmpx_get_entry: read of %s failed: %s", |
1226 | WTMPX_FILE, strerror(errno)); | |
1227 | close (fd); | |
1228 | return 0; | |
1229 | } | |
1d7b9b20 | 1230 | /* Logouts are recorded as a blank username on a particular line. |
1231 | * So, we just need to find the username in struct utmpx */ | |
5abcdf8e | 1232 | if ( wtmpx_islogin(li, &utx) ) { |
a05a70ab | 1233 | # ifdef HAVE_TV_IN_UTMPX |
1d7b9b20 | 1234 | li->tv_sec = utx.ut_tv.tv_sec; |
a05a70ab | 1235 | # else |
1d7b9b20 | 1236 | # ifdef HAVE_TIME_IN_UTMPX |
1237 | li->tv_sec = utx.ut_time; | |
1238 | # endif | |
a05a70ab | 1239 | # endif |
a4d05724 | 1240 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); |
a05a70ab | 1241 | # ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 1242 | strlcpy(li->hostname, utx.ut_host, |
1243 | MIN_SIZEOF(li->hostname, utx.ut_host)); | |
a05a70ab | 1244 | # endif |
5abcdf8e | 1245 | continue; |
1d7b9b20 | 1246 | } |
1247 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1248 | close (fd); | |
1249 | return 0; | |
1250 | } | |
5abcdf8e | 1251 | } |
1252 | ||
1253 | close(fd); | |
1d7b9b20 | 1254 | return 1; |
564dd50a | 1255 | } |
f988dce5 | 1256 | #endif /* USE_WTMPX */ |
1d7b9b20 | 1257 | |
1d7b9b20 | 1258 | /** |
564dd50a | 1259 | ** Low-level libutil login() functions |
1d7b9b20 | 1260 | **/ |
1261 | ||
1262 | #ifdef USE_LOGIN | |
1d7b9b20 | 1263 | static int |
564dd50a | 1264 | syslogin_perform_login(struct logininfo *li) |
1265 | { | |
1d7b9b20 | 1266 | struct utmp *ut; |
1267 | ||
dbaa2e87 | 1268 | if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) { |
1d7b9b20 | 1269 | log("syslogin_perform_login: couldn't malloc()"); |
1270 | return 0; | |
1271 | } | |
1272 | construct_utmp(li, ut); | |
1273 | login(ut); | |
1274 | ||
1275 | return 1; | |
564dd50a | 1276 | } |
1d7b9b20 | 1277 | |
564dd50a | 1278 | static int |
1279 | syslogin_perform_logout(struct logininfo *li) | |
1280 | { | |
a05a70ab | 1281 | # ifdef HAVE_LOGOUT |
1d7b9b20 | 1282 | char line[8]; |
1283 | ||
1284 | (void)line_stripname(line, li->line, sizeof(line)); | |
1285 | ||
1286 | if (!logout(line)) { | |
1287 | log("syslogin_perform_logout: logout() returned an error"); | |
a05a70ab | 1288 | # ifdef HAVE_LOGWTMP |
1d7b9b20 | 1289 | } else { |
1290 | logwtmp(line, "", ""); | |
a05a70ab | 1291 | # endif |
5637650d | 1292 | } |
5abcdf8e | 1293 | /* FIXME: (ATL - if the need arises) What to do if we have |
1294 | * login, but no logout? what if logout but no logwtmp? All | |
1295 | * routines are in libutil so they should all be there, | |
1296 | * but... */ | |
a05a70ab | 1297 | # endif |
1d7b9b20 | 1298 | return 1; |
564dd50a | 1299 | } |
1d7b9b20 | 1300 | |
1d7b9b20 | 1301 | int |
564dd50a | 1302 | syslogin_write_entry(struct logininfo *li) |
1303 | { | |
1d7b9b20 | 1304 | switch (li->type) { |
1305 | case LTYPE_LOGIN: | |
1306 | return syslogin_perform_login(li); | |
1307 | case LTYPE_LOGOUT: | |
1308 | return syslogin_perform_logout(li); | |
1309 | default: | |
1310 | log("syslogin_write_entry: Invalid type field"); | |
1311 | return 0; | |
1312 | } | |
564dd50a | 1313 | } |
f988dce5 | 1314 | #endif /* USE_LOGIN */ |
1d7b9b20 | 1315 | |
1316 | /* end of file log-syslogin.c */ | |
1317 | ||
1d7b9b20 | 1318 | /** |
564dd50a | 1319 | ** Low-level lastlog functions |
1d7b9b20 | 1320 | **/ |
1321 | ||
1322 | #ifdef USE_LASTLOG | |
a05a70ab | 1323 | #define LL_FILE 1 |
1324 | #define LL_DIR 2 | |
1325 | #define LL_OTHER 3 | |
1d7b9b20 | 1326 | |
1d7b9b20 | 1327 | static void |
564dd50a | 1328 | lastlog_construct(struct logininfo *li, struct lastlog *last) |
1329 | { | |
1d7b9b20 | 1330 | /* clear the structure */ |
dbaa2e87 | 1331 | memset(last, '\0', sizeof(*last)); |
1d7b9b20 | 1332 | |
a05a70ab | 1333 | (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line)); |
5abcdf8e | 1334 | strlcpy(last->ll_host, li->hostname, |
1335 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1d7b9b20 | 1336 | last->ll_time = li->tv_sec; |
564dd50a | 1337 | } |
1d7b9b20 | 1338 | |
1d7b9b20 | 1339 | static int |
564dd50a | 1340 | lastlog_filetype(char *filename) |
1341 | { | |
1d7b9b20 | 1342 | struct stat st; |
1343 | ||
a05a70ab | 1344 | if (stat(LASTLOG_FILE, &st) != 0) { |
1345 | log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE, | |
1346 | strerror(errno)); | |
1d7b9b20 | 1347 | return 0; |
1348 | } | |
1d7b9b20 | 1349 | if (S_ISDIR(st.st_mode)) |
1350 | return LL_DIR; | |
1351 | else if (S_ISREG(st.st_mode)) | |
1352 | return LL_FILE; | |
1353 | else | |
1354 | return LL_OTHER; | |
564dd50a | 1355 | } |
1d7b9b20 | 1356 | |
1357 | ||
1358 | /* open the file (using filemode) and seek to the login entry */ | |
1359 | static int | |
564dd50a | 1360 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) |
1361 | { | |
1d7b9b20 | 1362 | off_t offset; |
1363 | int type; | |
1364 | char lastlog_file[1024]; | |
1365 | ||
1366 | type = lastlog_filetype(LASTLOG_FILE); | |
1367 | switch (type) { | |
d8caae24 | 1368 | case LL_FILE: |
1369 | strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); | |
1370 | break; | |
1371 | case LL_DIR: | |
1372 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1373 | LASTLOG_FILE, li->username); | |
1374 | break; | |
1375 | default: | |
1376 | log("lastlog_openseek: %.100s is not a file or directory!", | |
1377 | LASTLOG_FILE); | |
1378 | return 0; | |
a05a70ab | 1379 | } |
1d7b9b20 | 1380 | |
1381 | *fd = open(lastlog_file, filemode); | |
1382 | if ( *fd < 0) { | |
9f32ceb4 | 1383 | debug("lastlog_openseek: Couldn't open %s: %s", |
1d7b9b20 | 1384 | lastlog_file, strerror(errno)); |
1385 | return 0; | |
1386 | } | |
a05a70ab | 1387 | |
d93a7e5a | 1388 | if (type == LL_FILE) { |
1389 | /* find this uid's offset in the lastlog file */ | |
1390 | offset = (off_t) ( (long)li->uid * sizeof(struct lastlog)); | |
1d7b9b20 | 1391 | |
d93a7e5a | 1392 | if ( lseek(*fd, offset, SEEK_SET) != offset ) { |
1393 | log("lastlog_openseek: %s->lseek(): %s", | |
1394 | lastlog_file, strerror(errno)); | |
1395 | return 0; | |
1396 | } | |
1d7b9b20 | 1397 | } |
d93a7e5a | 1398 | |
1d7b9b20 | 1399 | return 1; |
564dd50a | 1400 | } |
1d7b9b20 | 1401 | |
1402 | static int | |
564dd50a | 1403 | lastlog_perform_login(struct logininfo *li) |
1404 | { | |
1d7b9b20 | 1405 | struct lastlog last; |
1406 | int fd; | |
1407 | ||
1408 | /* create our struct lastlog */ | |
1409 | lastlog_construct(li, &last); | |
1410 | ||
1a022229 | 1411 | if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) |
1412 | return(0); | |
1413 | ||
1d7b9b20 | 1414 | /* write the entry */ |
1a022229 | 1415 | if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) { |
1416 | close(fd); | |
1417 | log("lastlog_write_filemode: Error writing to %s: %s", | |
1418 | LASTLOG_FILE, strerror(errno)); | |
1d7b9b20 | 1419 | return 0; |
a05a70ab | 1420 | } |
1a022229 | 1421 | |
1422 | close(fd); | |
1423 | return 1; | |
564dd50a | 1424 | } |
1d7b9b20 | 1425 | |
1d7b9b20 | 1426 | int |
564dd50a | 1427 | lastlog_write_entry(struct logininfo *li) |
1428 | { | |
1d7b9b20 | 1429 | switch(li->type) { |
1430 | case LTYPE_LOGIN: | |
1431 | return lastlog_perform_login(li); | |
1432 | default: | |
1433 | log("lastlog_write_entry: Invalid type field"); | |
1434 | return 0; | |
1435 | } | |
564dd50a | 1436 | } |
1d7b9b20 | 1437 | |
1d7b9b20 | 1438 | static void |
564dd50a | 1439 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) |
1440 | { | |
1d7b9b20 | 1441 | line_fullname(li->line, last->ll_line, sizeof(li->line)); |
a05a70ab | 1442 | strlcpy(li->hostname, last->ll_host, |
5abcdf8e | 1443 | MIN_SIZEOF(li->hostname, last->ll_host)); |
1d7b9b20 | 1444 | li->tv_sec = last->ll_time; |
564dd50a | 1445 | } |
1d7b9b20 | 1446 | |
1d7b9b20 | 1447 | int |
564dd50a | 1448 | lastlog_get_entry(struct logininfo *li) |
1449 | { | |
1d7b9b20 | 1450 | struct lastlog last; |
1451 | int fd; | |
1452 | ||
1453 | if (lastlog_openseek(li, &fd, O_RDONLY)) { | |
9f32ceb4 | 1454 | if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) { |
1455 | log("lastlog_get_entry: Error reading from %s: %s", | |
1d7b9b20 | 1456 | LASTLOG_FILE, strerror(errno)); |
1457 | return 0; | |
1458 | } else { | |
1459 | lastlog_populate_entry(li, &last); | |
1460 | return 1; | |
1461 | } | |
a05a70ab | 1462 | } else { |
1d7b9b20 | 1463 | return 0; |
a05a70ab | 1464 | } |
564dd50a | 1465 | } |
f988dce5 | 1466 | #endif /* USE_LASTLOG */ |