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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 |
44d5f7f7 | 146 | ** NeXT - M68k/HPPA/Sparc (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 | ||
44d5f7f7 | 166 | #ifdef HAVE_UTIL_H |
167 | # include <util.h> | |
168 | #endif | |
169 | ||
1d7b9b20 | 170 | /** |
171 | ** prototypes for helper functions in this file | |
172 | **/ | |
173 | ||
174 | #if HAVE_UTMP_H | |
1d7b9b20 | 175 | void set_utmp_time(struct logininfo *li, struct utmp *ut); |
176 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
177 | #endif | |
178 | ||
179 | #ifdef HAVE_UTMPX_H | |
1d7b9b20 | 180 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); |
181 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
182 | #endif | |
183 | ||
184 | int utmp_write_entry(struct logininfo *li); | |
185 | int utmpx_write_entry(struct logininfo *li); | |
186 | int wtmp_write_entry(struct logininfo *li); | |
187 | int wtmpx_write_entry(struct logininfo *li); | |
188 | int lastlog_write_entry(struct logininfo *li); | |
189 | int syslogin_write_entry(struct logininfo *li); | |
190 | ||
191 | int getlast_entry(struct logininfo *li); | |
192 | int lastlog_get_entry(struct logininfo *li); | |
193 | int wtmp_get_entry(struct logininfo *li); | |
194 | int wtmpx_get_entry(struct logininfo *li); | |
195 | ||
5abcdf8e | 196 | /* pick the shortest string */ |
197 | #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) ) | |
198 | ||
1d7b9b20 | 199 | /** |
200 | ** platform-independent login functions | |
201 | **/ | |
202 | ||
5abcdf8e | 203 | /* login_login(struct logininfo *) -Record a login |
204 | * | |
205 | * Call with a pointer to a struct logininfo initialised with | |
206 | * login_init_entry() or login_alloc_entry() | |
207 | * | |
208 | * Returns: | |
209 | * >0 if successful | |
210 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
211 | */ | |
564dd50a | 212 | int |
213 | login_login (struct logininfo *li) | |
214 | { | |
215 | li->type = LTYPE_LOGIN; | |
216 | return login_write(li); | |
217 | } | |
1d7b9b20 | 218 | |
219 | ||
5abcdf8e | 220 | /* login_logout(struct logininfo *) - Record a logout |
221 | * | |
222 | * Call as with login_login() | |
223 | * | |
224 | * Returns: | |
225 | * >0 if successful | |
226 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
227 | */ | |
564dd50a | 228 | int |
229 | login_logout(struct logininfo *li) | |
230 | { | |
231 | li->type = LTYPE_LOGOUT; | |
232 | return login_write(li); | |
1d7b9b20 | 233 | } |
234 | ||
5abcdf8e | 235 | /* login_get_lastlog_time(int) - Retrieve the last login time |
236 | * | |
237 | * Retrieve the last login time for the given uid. Will try to use the | |
238 | * system lastlog facilities if they are available, but will fall back | |
239 | * to looking in wtmp/wtmpx if necessary | |
240 | * | |
241 | * Returns: | |
242 | * 0 on failure, or if user has never logged in | |
243 | * Time in seconds from the epoch if successful | |
244 | * | |
245 | * Useful preprocessor symbols: | |
246 | * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog | |
247 | * info | |
248 | * USE_LASTLOG: If set, indicates the presence of system lastlog | |
249 | * facilities. If this and DISABLE_LASTLOG are not set, | |
250 | * try to retrieve lastlog information from wtmp/wtmpx. | |
251 | */ | |
564dd50a | 252 | unsigned int |
253 | login_get_lastlog_time(const int uid) | |
254 | { | |
255 | struct logininfo li; | |
1d7b9b20 | 256 | |
5abcdf8e | 257 | if (login_get_lastlog(&li, uid)) |
258 | return li.tv_sec; | |
259 | else | |
260 | return 0; | |
564dd50a | 261 | } |
1d7b9b20 | 262 | |
5abcdf8e | 263 | /* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry |
264 | * | |
265 | * Retrieve a logininfo structure populated (only partially) with | |
266 | * information from the system lastlog data, or from wtmp/wtmpx if no | |
267 | * system lastlog information exists. | |
268 | * | |
269 | * Note this routine must be given a pre-allocated logininfo. | |
270 | * | |
271 | * Returns: | |
272 | * >0: A pointer to your struct logininfo if successful | |
273 | * 0 on failure (will use OpenSSH's logging facilities for diagnostics) | |
274 | * | |
275 | */ | |
564dd50a | 276 | struct logininfo * |
277 | login_get_lastlog(struct logininfo *li, const int uid) | |
278 | { | |
5abcdf8e | 279 | struct passwd *pw; |
5abcdf8e | 280 | |
dbaa2e87 | 281 | memset(li, '\0', sizeof(*li)); |
1d7b9b20 | 282 | li->uid = uid; |
5abcdf8e | 283 | |
9f32ceb4 | 284 | /* |
285 | * If we don't have a 'real' lastlog, we need the username to | |
5abcdf8e | 286 | * reliably search wtmp(x) for the last login (see |
9f32ceb4 | 287 | * wtmp_get_entry().) |
288 | */ | |
5abcdf8e | 289 | pw = getpwuid(uid); |
a05a70ab | 290 | if (pw == NULL) |
291 | fatal("login_get_lastlog: Cannot find account for uid %i", uid); | |
292 | ||
1bfbb762 | 293 | /* No MIN_SIZEOF here - we absolutely *must not* truncate the |
294 | * username */ | |
d8caae24 | 295 | strlcpy(li->username, pw->pw_name, sizeof(li->username)); |
a05a70ab | 296 | |
564dd50a | 297 | if (getlast_entry(li)) |
298 | return li; | |
299 | else | |
a05a70ab | 300 | return NULL; |
1d7b9b20 | 301 | } |
302 | ||
1d7b9b20 | 303 | |
5abcdf8e | 304 | /* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise |
305 | * a logininfo structure | |
306 | * | |
307 | * This function creates a new struct logininfo, a data structure | |
308 | * meant to carry the information required to portably record login info. | |
309 | * | |
310 | * Returns a pointer to a newly created struct logininfo. If memory | |
311 | * allocation fails, the program halts. | |
312 | */ | |
564dd50a | 313 | struct |
314 | logininfo *login_alloc_entry(int pid, const char *username, | |
315 | const char *hostname, const char *line) | |
316 | { | |
317 | struct logininfo *newli; | |
1d7b9b20 | 318 | |
dbaa2e87 | 319 | newli = (struct logininfo *) xmalloc (sizeof(*newli)); |
564dd50a | 320 | (void)login_init_entry(newli, pid, username, hostname, line); |
321 | return newli; | |
1d7b9b20 | 322 | } |
323 | ||
324 | ||
5abcdf8e | 325 | /* login_free_entry(struct logininfo *) - free struct memory */ |
1d7b9b20 | 326 | void |
564dd50a | 327 | login_free_entry(struct logininfo *li) |
328 | { | |
329 | xfree(li); | |
1d7b9b20 | 330 | } |
331 | ||
332 | ||
5abcdf8e | 333 | /* login_init_entry(struct logininfo *, int, char*, char*, char*) |
334 | * - initialise a struct logininfo | |
335 | * | |
336 | * Populates a new struct logininfo, a data structure meant to carry | |
337 | * the information required to portably record login info. | |
338 | * | |
339 | * Returns: 1 | |
340 | */ | |
564dd50a | 341 | int |
342 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
343 | const char *hostname, const char *line) | |
344 | { | |
d8caae24 | 345 | struct passwd *pw; |
346 | ||
dbaa2e87 | 347 | memset(li, 0, sizeof(*li)); |
564dd50a | 348 | |
349 | li->pid = pid; | |
d8caae24 | 350 | |
564dd50a | 351 | /* set the line information */ |
352 | if (line) | |
353 | line_fullname(li->line, line, sizeof(li->line)); | |
1d7b9b20 | 354 | |
d8caae24 | 355 | if (username) { |
564dd50a | 356 | strlcpy(li->username, username, sizeof(li->username)); |
d8caae24 | 357 | pw = getpwnam(li->username); |
358 | if (pw == NULL) | |
359 | fatal("login_init_entry: Cannot find user \"%s\"", li->username); | |
360 | li->uid = pw->pw_uid; | |
361 | } | |
a05a70ab | 362 | |
564dd50a | 363 | if (hostname) |
364 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
d8caae24 | 365 | |
564dd50a | 366 | return 1; |
1d7b9b20 | 367 | } |
368 | ||
5abcdf8e | 369 | /* login_set_current_time(struct logininfo *) - set the current time |
370 | * | |
371 | * Set the current time in a logininfo structure. This function is | |
372 | * meant to eliminate the need to deal with system dependencies for | |
373 | * time handling. | |
374 | */ | |
1d7b9b20 | 375 | void |
564dd50a | 376 | login_set_current_time(struct logininfo *li) |
377 | { | |
1d7b9b20 | 378 | struct timeval tv; |
379 | ||
380 | gettimeofday(&tv, NULL); | |
d8caae24 | 381 | |
382 | li->tv_sec = tv.tv_sec; | |
383 | li->tv_usec = tv.tv_usec; | |
1d7b9b20 | 384 | } |
385 | ||
564dd50a | 386 | /* copy a sockaddr_* into our logininfo */ |
1d7b9b20 | 387 | void |
564dd50a | 388 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, |
389 | const unsigned int sa_size) | |
390 | { | |
391 | unsigned int bufsize = sa_size; | |
392 | ||
393 | /* make sure we don't overrun our union */ | |
394 | if (sizeof(li->hostaddr) < sa_size) | |
395 | bufsize = sizeof(li->hostaddr); | |
396 | ||
397 | memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize); | |
1d7b9b20 | 398 | } |
1d7b9b20 | 399 | |
564dd50a | 400 | |
401 | /** | |
402 | ** login_write: Call low-level recording functions based on autoconf | |
403 | ** results | |
404 | **/ | |
1d7b9b20 | 405 | int |
564dd50a | 406 | login_write (struct logininfo *li) |
407 | { | |
3c62e7eb | 408 | #ifndef HAVE_CYGWIN |
1d7b9b20 | 409 | if ((int)geteuid() != 0) { |
410 | log("Attempt to write login records by non-root user (aborting)"); | |
411 | return 1; | |
412 | } | |
3c62e7eb | 413 | #endif |
a05a70ab | 414 | |
1d7b9b20 | 415 | /* set the timestamp */ |
416 | login_set_current_time(li); | |
417 | #ifdef USE_LOGIN | |
418 | syslogin_write_entry(li); | |
419 | #endif | |
420 | #ifdef USE_LASTLOG | |
421 | if (li->type == LTYPE_LOGIN) { | |
422 | lastlog_write_entry(li); | |
423 | } | |
424 | #endif | |
425 | #ifdef USE_UTMP | |
426 | utmp_write_entry(li); | |
427 | #endif | |
428 | #ifdef USE_WTMP | |
429 | wtmp_write_entry(li); | |
430 | #endif | |
431 | #ifdef USE_UTMPX | |
432 | utmpx_write_entry(li); | |
433 | #endif | |
434 | #ifdef USE_WTMPX | |
435 | wtmpx_write_entry(li); | |
436 | #endif | |
437 | return 0; | |
438 | } | |
439 | ||
564dd50a | 440 | /** |
441 | ** getlast_entry: Call low-level functions to retrieve the last login | |
442 | ** time. | |
443 | **/ | |
1d7b9b20 | 444 | |
564dd50a | 445 | /* take the uid in li and return the last login time */ |
1d7b9b20 | 446 | int |
564dd50a | 447 | getlast_entry(struct logininfo *li) |
448 | { | |
449 | #ifdef USE_LASTLOG | |
9f32ceb4 | 450 | return(lastlog_get_entry(li)); |
a05a70ab | 451 | #else /* !USE_LASTLOG */ |
1d7b9b20 | 452 | |
a05a70ab | 453 | #ifdef DISABLE_LASTLOG |
3f45f1c3 | 454 | /* On some systems we shouldn't even try to obtain last login |
455 | * time, e.g. AIX */ | |
456 | return 0; | |
a05a70ab | 457 | # else /* DISABLE_LASTLOG */ |
564dd50a | 458 | /* Try to retrieve the last login time from wtmp */ |
a05a70ab | 459 | # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) |
564dd50a | 460 | /* retrieve last login time from utmp */ |
a05a70ab | 461 | return (wtmp_get_entry(li)); |
462 | # else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */ | |
564dd50a | 463 | /* If wtmp isn't available, try wtmpx */ |
a05a70ab | 464 | # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) |
564dd50a | 465 | /* retrieve last login time from utmpx */ |
a05a70ab | 466 | return (wtmpx_get_entry(li)); |
467 | # else | |
564dd50a | 468 | /* Give up: No means of retrieving last login time */ |
469 | return 0; | |
a05a70ab | 470 | # endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */ |
471 | # endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */ | |
472 | # endif /* DISABLE_LASTLOG */ | |
473 | #endif /* USE_LASTLOG */ | |
564dd50a | 474 | } |
1d7b9b20 | 475 | |
476 | ||
1d7b9b20 | 477 | |
478 | /* | |
564dd50a | 479 | * 'line' string utility functions |
480 | * | |
481 | * These functions process the 'line' string into one of three forms: | |
482 | * | |
1d7b9b20 | 483 | * 1. The full filename (including '/dev') |
484 | * 2. The stripped name (excluding '/dev') | |
564dd50a | 485 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 |
486 | * /dev/pts/1 -> ts/1 ) | |
1d7b9b20 | 487 | * |
488 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
489 | * attempting to remove it. Typically both addition and removal is | |
564dd50a | 490 | * performed by one application - say, sshd - so as long as the choice |
491 | * uniquely identifies a terminal it's ok. | |
1d7b9b20 | 492 | */ |
493 | ||
494 | ||
564dd50a | 495 | /* line_fullname(): add the leading '/dev/' if it doesn't exist make |
496 | * sure dst has enough space, if not just copy src (ugh) */ | |
1d7b9b20 | 497 | char * |
564dd50a | 498 | line_fullname(char *dst, const char *src, int dstsize) |
499 | { | |
1d7b9b20 | 500 | memset(dst, '\0', dstsize); |
89d7510a | 501 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) { |
1d7b9b20 | 502 | strlcpy(dst, src, dstsize); |
89d7510a | 503 | } else { |
a4d05724 | 504 | strlcpy(dst, "/dev/", dstsize); |
1d7b9b20 | 505 | strlcat(dst, src, dstsize); |
506 | } | |
507 | return dst; | |
508 | } | |
509 | ||
564dd50a | 510 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ |
1d7b9b20 | 511 | char * |
564dd50a | 512 | line_stripname(char *dst, const char *src, int dstsize) |
513 | { | |
1d7b9b20 | 514 | memset(dst, '\0', dstsize); |
515 | if (strncmp(src, "/dev/", 5) == 0) | |
89d7510a | 516 | strlcpy(dst, src + 5, dstsize); |
1d7b9b20 | 517 | else |
518 | strlcpy(dst, src, dstsize); | |
519 | return dst; | |
564dd50a | 520 | } |
521 | ||
564dd50a | 522 | /* line_abbrevname(): Return the abbreviated (usually four-character) |
523 | * form of the line (Just use the last <dstsize> characters of the | |
524 | * full name.) | |
525 | * | |
526 | * NOTE: use strncpy because we do NOT necessarily want zero | |
527 | * termination */ | |
1d7b9b20 | 528 | char * |
a05a70ab | 529 | line_abbrevname(char *dst, const char *src, int dstsize) |
530 | { | |
531 | size_t len; | |
532 | ||
1d7b9b20 | 533 | memset(dst, '\0', dstsize); |
a05a70ab | 534 | |
daaff4d5 | 535 | /* Always skip prefix if present */ |
89d7510a | 536 | #ifdef sgi |
537 | if (strncmp(src, "/dev/tty", 8) == 0) | |
538 | src += 8; | |
539 | #else | |
daaff4d5 | 540 | if (strncmp(src, "/dev/", 5) == 0) |
541 | src += 5; | |
89d7510a | 542 | #endif |
daaff4d5 | 543 | |
a05a70ab | 544 | len = strlen(src); |
545 | ||
daaff4d5 | 546 | if (len > 0) { |
547 | if (((int)len - dstsize) > 0) | |
548 | src += ((int)len - dstsize); | |
549 | ||
550 | /* note: _don't_ change this to strlcpy */ | |
551 | strncpy(dst, src, (size_t)dstsize); | |
a05a70ab | 552 | } |
553 | ||
1d7b9b20 | 554 | return dst; |
555 | } | |
556 | ||
1d7b9b20 | 557 | /** |
558 | ** utmp utility functions | |
564dd50a | 559 | ** |
560 | ** These functions manipulate struct utmp, taking system differences | |
561 | ** into account. | |
1d7b9b20 | 562 | **/ |
563 | ||
564 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
565 | ||
1d7b9b20 | 566 | /* build the utmp structure */ |
567 | void | |
564dd50a | 568 | set_utmp_time(struct logininfo *li, struct utmp *ut) |
569 | { | |
a05a70ab | 570 | # ifdef HAVE_TV_IN_UTMP |
1d7b9b20 | 571 | ut->ut_tv.tv_sec = li->tv_sec; |
572 | ut->ut_tv.tv_usec = li->tv_usec; | |
a05a70ab | 573 | # else |
1d7b9b20 | 574 | # ifdef HAVE_TIME_IN_UTMP |
575 | ut->ut_time = li->tv_sec; | |
576 | # endif | |
a05a70ab | 577 | # endif |
1d7b9b20 | 578 | } |
579 | ||
580 | void | |
581 | construct_utmp(struct logininfo *li, | |
564dd50a | 582 | struct utmp *ut) |
583 | { | |
dbaa2e87 | 584 | memset(ut, '\0', sizeof(*ut)); |
5abcdf8e | 585 | |
586 | /* First fill out fields used for both logins and logouts */ | |
587 | ||
a05a70ab | 588 | # ifdef HAVE_ID_IN_UTMP |
1d7b9b20 | 589 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); |
a05a70ab | 590 | # endif |
1d7b9b20 | 591 | |
a05a70ab | 592 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 593 | /* This is done here to keep utmp constants out of struct logininfo */ |
1d7b9b20 | 594 | switch (li->type) { |
595 | case LTYPE_LOGIN: | |
596 | ut->ut_type = USER_PROCESS; | |
597 | break; | |
598 | case LTYPE_LOGOUT: | |
599 | ut->ut_type = DEAD_PROCESS; | |
600 | break; | |
601 | } | |
a05a70ab | 602 | # endif |
5abcdf8e | 603 | set_utmp_time(li, ut); |
1d7b9b20 | 604 | |
5abcdf8e | 605 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); |
a05a70ab | 606 | |
607 | # ifdef HAVE_PID_IN_UTMP | |
1d7b9b20 | 608 | ut->ut_pid = li->pid; |
a05a70ab | 609 | # endif |
5abcdf8e | 610 | |
611 | /* If we're logging out, leave all other fields blank */ | |
612 | if (li->type == LTYPE_LOGOUT) | |
613 | return; | |
614 | ||
a05a70ab | 615 | /* |
616 | * These fields are only used when logging in, and are blank | |
617 | * for logouts. | |
618 | */ | |
5abcdf8e | 619 | |
620 | /* Use strncpy because we don't necessarily want null termination */ | |
dc2a6d09 | 621 | strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username)); |
a05a70ab | 622 | # ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 623 | strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname)); |
a05a70ab | 624 | # endif |
625 | # ifdef HAVE_ADDR_IN_UTMP | |
564dd50a | 626 | /* this is just a 32-bit IP address */ |
627 | if (li->hostaddr.sa.sa_family == AF_INET) | |
628 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
a05a70ab | 629 | # endif |
564dd50a | 630 | } |
a05a70ab | 631 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ |
564dd50a | 632 | |
1d7b9b20 | 633 | /** |
634 | ** utmpx utility functions | |
564dd50a | 635 | ** |
636 | ** These functions manipulate struct utmpx, accounting for system | |
637 | ** variations. | |
1d7b9b20 | 638 | **/ |
639 | ||
640 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
1d7b9b20 | 641 | /* build the utmpx structure */ |
642 | void | |
564dd50a | 643 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) |
644 | { | |
a05a70ab | 645 | # ifdef HAVE_TV_IN_UTMPX |
1d7b9b20 | 646 | utx->ut_tv.tv_sec = li->tv_sec; |
647 | utx->ut_tv.tv_usec = li->tv_usec; | |
a05a70ab | 648 | # else /* HAVE_TV_IN_UTMPX */ |
1d7b9b20 | 649 | # ifdef HAVE_TIME_IN_UTMPX |
650 | utx->ut_time = li->tv_sec; | |
a05a70ab | 651 | # endif /* HAVE_TIME_IN_UTMPX */ |
652 | # endif /* HAVE_TV_IN_UTMPX */ | |
1d7b9b20 | 653 | } |
654 | ||
655 | void | |
564dd50a | 656 | construct_utmpx(struct logininfo *li, struct utmpx *utx) |
657 | { | |
dbaa2e87 | 658 | memset(utx, '\0', sizeof(*utx)); |
daaff4d5 | 659 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 660 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); |
daaff4d5 | 661 | # endif |
1d7b9b20 | 662 | |
663 | /* this is done here to keep utmp constants out of loginrec.h */ | |
664 | switch (li->type) { | |
665 | case LTYPE_LOGIN: | |
666 | utx->ut_type = USER_PROCESS; | |
667 | break; | |
668 | case LTYPE_LOGOUT: | |
669 | utx->ut_type = DEAD_PROCESS; | |
670 | break; | |
671 | } | |
1d7b9b20 | 672 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); |
1d7b9b20 | 673 | set_utmpx_time(li, utx); |
5abcdf8e | 674 | utx->ut_pid = li->pid; |
675 | ||
676 | if (li->type == LTYPE_LOGOUT) | |
677 | return; | |
678 | ||
a05a70ab | 679 | /* |
680 | * These fields are only used when logging in, and are blank | |
681 | * for logouts. | |
682 | */ | |
5abcdf8e | 683 | |
684 | /* strncpy(): Don't necessarily want null termination */ | |
dc2a6d09 | 685 | strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username)); |
a05a70ab | 686 | # ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 687 | strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname)); |
a05a70ab | 688 | # endif |
689 | # ifdef HAVE_ADDR_IN_UTMPX | |
764d4113 | 690 | /* this is just a 32-bit IP address */ |
691 | if (li->hostaddr.sa.sa_family == AF_INET) | |
692 | utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
a05a70ab | 693 | # endif |
694 | # ifdef HAVE_SYSLEN_IN_UTMPX | |
5abcdf8e | 695 | /* ut_syslen is the length of the utx_host string */ |
696 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
a05a70ab | 697 | # endif |
564dd50a | 698 | } |
a05a70ab | 699 | #endif /* USE_UTMPX || USE_WTMPX */ |
1d7b9b20 | 700 | |
701 | /** | |
564dd50a | 702 | ** Low-level utmp functions |
1d7b9b20 | 703 | **/ |
704 | ||
705 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
1d7b9b20 | 706 | #ifdef USE_UTMP |
707 | ||
1d7b9b20 | 708 | /* if we can, use pututline() etc. */ |
a05a70ab | 709 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ |
710 | defined(HAVE_PUTUTLINE) | |
1d7b9b20 | 711 | # define UTMP_USE_LIBRARY |
a05a70ab | 712 | # endif |
1d7b9b20 | 713 | |
714 | ||
715 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
a05a70ab | 716 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 717 | static int |
564dd50a | 718 | utmp_write_library(struct logininfo *li, struct utmp *ut) |
719 | { | |
1d7b9b20 | 720 | setutent(); |
721 | pututline(ut); | |
722 | ||
a05a70ab | 723 | # ifdef HAVE_ENDUTENT |
1d7b9b20 | 724 | endutent(); |
a05a70ab | 725 | # endif |
1d7b9b20 | 726 | return 1; |
564dd50a | 727 | } |
a05a70ab | 728 | # else /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 729 | |
730 | /* write a utmp entry direct to the file */ | |
564dd50a | 731 | /* This is a slightly modification of code in OpenBSD's login.c */ |
1d7b9b20 | 732 | static int |
564dd50a | 733 | utmp_write_direct(struct logininfo *li, struct utmp *ut) |
734 | { | |
1d7b9b20 | 735 | struct utmp old_ut; |
736 | register int fd; | |
737 | int tty; | |
738 | ||
5abcdf8e | 739 | /* FIXME: (ATL) ttyslot() needs local implementation */ |
dbaa2e87 | 740 | |
698d107e | 741 | #if defined(HAVE_GETTTYENT) |
dbaa2e87 | 742 | register struct ttyent *ty; |
743 | ||
744 | tty=0; | |
745 | ||
746 | setttyent(); | |
747 | while ((struct ttyent *)0 != (ty = getttyent())) { | |
748 | tty++; | |
749 | if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) | |
750 | break; | |
751 | } | |
752 | endttyent(); | |
753 | ||
754 | if((struct ttyent *)0 == ty) { | |
755 | log("utmp_write_entry: tty not found"); | |
756 | return(1); | |
757 | } | |
758 | #else /* FIXME */ | |
759 | ||
1d7b9b20 | 760 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ |
761 | ||
698d107e | 762 | #endif /* HAVE_GETTTYENT */ |
dbaa2e87 | 763 | |
1d7b9b20 | 764 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { |
765 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
766 | /* | |
767 | * Prevent luser from zero'ing out ut_host. | |
768 | * If the new ut_line is empty but the old one is not | |
dc2a6d09 | 769 | * and ut_line and ut_name match, preserve the old ut_line. |
1d7b9b20 | 770 | */ |
9f32ceb4 | 771 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && |
772 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && | |
773 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
dc2a6d09 | 774 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) { |
1d7b9b20 | 775 | (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); |
9f32ceb4 | 776 | } |
777 | ||
1d7b9b20 | 778 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); |
32eec038 | 779 | if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) |
1d7b9b20 | 780 | log("utmp_write_direct: error writing %s: %s", |
5abcdf8e | 781 | UTMP_FILE, strerror(errno)); |
1d7b9b20 | 782 | |
783 | (void)close(fd); | |
784 | return 1; | |
9f32ceb4 | 785 | } else { |
1d7b9b20 | 786 | return 0; |
9f32ceb4 | 787 | } |
564dd50a | 788 | } |
a05a70ab | 789 | # endif /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 790 | |
791 | static int | |
564dd50a | 792 | utmp_perform_login(struct logininfo *li) |
793 | { | |
1d7b9b20 | 794 | struct utmp ut; |
795 | ||
796 | construct_utmp(li, &ut); | |
a05a70ab | 797 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 798 | if (!utmp_write_library(li, &ut)) { |
5abcdf8e | 799 | log("utmp_perform_login: utmp_write_library() failed"); |
1d7b9b20 | 800 | return 0; |
801 | } | |
a05a70ab | 802 | # else |
1d7b9b20 | 803 | if (!utmp_write_direct(li, &ut)) { |
804 | log("utmp_perform_login: utmp_write_direct() failed"); | |
805 | return 0; | |
806 | } | |
a05a70ab | 807 | # endif |
1d7b9b20 | 808 | return 1; |
564dd50a | 809 | } |
1d7b9b20 | 810 | |
811 | ||
812 | static int | |
564dd50a | 813 | utmp_perform_logout(struct logininfo *li) |
814 | { | |
1d7b9b20 | 815 | struct utmp ut; |
816 | ||
5abcdf8e | 817 | construct_utmp(li, &ut); |
a05a70ab | 818 | # ifdef UTMP_USE_LIBRARY |
5abcdf8e | 819 | if (!utmp_write_library(li, &ut)) { |
820 | log("utmp_perform_logout: utmp_write_library() failed"); | |
821 | return 0; | |
822 | } | |
a05a70ab | 823 | # else |
5abcdf8e | 824 | if (!utmp_write_direct(li, &ut)) { |
825 | log("utmp_perform_logout: utmp_write_direct() failed"); | |
826 | return 0; | |
827 | } | |
a05a70ab | 828 | # endif |
1d7b9b20 | 829 | return 1; |
564dd50a | 830 | } |
1d7b9b20 | 831 | |
832 | ||
833 | int | |
564dd50a | 834 | utmp_write_entry(struct logininfo *li) |
835 | { | |
1d7b9b20 | 836 | switch(li->type) { |
837 | case LTYPE_LOGIN: | |
838 | return utmp_perform_login(li); | |
839 | ||
840 | case LTYPE_LOGOUT: | |
841 | return utmp_perform_logout(li); | |
842 | ||
843 | default: | |
844 | log("utmp_write_entry: invalid type field"); | |
845 | return 0; | |
846 | } | |
564dd50a | 847 | } |
a05a70ab | 848 | #endif /* USE_UTMP */ |
1d7b9b20 | 849 | |
850 | ||
851 | /** | |
564dd50a | 852 | ** Low-level utmpx functions |
1d7b9b20 | 853 | **/ |
854 | ||
855 | /* not much point if we don't want utmpx entries */ | |
856 | #ifdef USE_UTMPX | |
857 | ||
1d7b9b20 | 858 | /* if we have the wherewithall, use pututxline etc. */ |
a05a70ab | 859 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ |
860 | defined(HAVE_PUTUTXLINE) | |
1d7b9b20 | 861 | # define UTMPX_USE_LIBRARY |
a05a70ab | 862 | # endif |
1d7b9b20 | 863 | |
864 | ||
865 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
a05a70ab | 866 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 867 | static int |
564dd50a | 868 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) |
869 | { | |
1d7b9b20 | 870 | setutxent(); |
871 | pututxline(utx); | |
872 | ||
a05a70ab | 873 | # ifdef HAVE_ENDUTXENT |
1d7b9b20 | 874 | endutxent(); |
a05a70ab | 875 | # endif |
1d7b9b20 | 876 | return 1; |
564dd50a | 877 | } |
1d7b9b20 | 878 | |
a05a70ab | 879 | # else /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 880 | |
881 | /* write a utmp entry direct to the file */ | |
882 | static int | |
564dd50a | 883 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) |
884 | { | |
1d7b9b20 | 885 | log("utmpx_write_direct: not implemented!"); |
886 | return 0; | |
564dd50a | 887 | } |
a05a70ab | 888 | # endif /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 889 | |
890 | static int | |
564dd50a | 891 | utmpx_perform_login(struct logininfo *li) |
892 | { | |
1d7b9b20 | 893 | struct utmpx utx; |
894 | ||
895 | construct_utmpx(li, &utx); | |
a05a70ab | 896 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 897 | if (!utmpx_write_library(li, &utx)) { |
898 | log("utmpx_perform_login: utmp_write_library() failed"); | |
899 | return 0; | |
900 | } | |
a05a70ab | 901 | # else |
1d7b9b20 | 902 | if (!utmpx_write_direct(li, &ut)) { |
903 | log("utmpx_perform_login: utmp_write_direct() failed"); | |
904 | return 0; | |
905 | } | |
a05a70ab | 906 | # endif |
1d7b9b20 | 907 | return 1; |
564dd50a | 908 | } |
1d7b9b20 | 909 | |
910 | ||
911 | static int | |
564dd50a | 912 | utmpx_perform_logout(struct logininfo *li) |
913 | { | |
1d7b9b20 | 914 | struct utmpx utx; |
915 | ||
916 | memset(&utx, '\0', sizeof(utx)); | |
917 | set_utmpx_time(li, &utx); | |
918 | line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line)); | |
a05a70ab | 919 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 920 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); |
a05a70ab | 921 | # endif |
922 | # ifdef HAVE_TYPE_IN_UTMPX | |
1d7b9b20 | 923 | utx.ut_type = DEAD_PROCESS; |
a05a70ab | 924 | # endif |
1d7b9b20 | 925 | |
a05a70ab | 926 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 927 | utmpx_write_library(li, &utx); |
a05a70ab | 928 | # else |
1d7b9b20 | 929 | utmpx_write_direct(li, &utx); |
a05a70ab | 930 | # endif |
1d7b9b20 | 931 | return 1; |
564dd50a | 932 | } |
1d7b9b20 | 933 | |
1d7b9b20 | 934 | int |
564dd50a | 935 | utmpx_write_entry(struct logininfo *li) |
936 | { | |
1d7b9b20 | 937 | switch(li->type) { |
938 | case LTYPE_LOGIN: | |
939 | return utmpx_perform_login(li); | |
940 | case LTYPE_LOGOUT: | |
941 | return utmpx_perform_logout(li); | |
942 | default: | |
943 | log("utmpx_write_entry: invalid type field"); | |
944 | return 0; | |
945 | } | |
564dd50a | 946 | } |
a05a70ab | 947 | #endif /* USE_UTMPX */ |
1d7b9b20 | 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) |
9f32ceb4 | 970 | if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) { |
1d7b9b20 | 971 | ftruncate(fd, buf.st_size); |
972 | log("wtmp_write: problem writing %s: %s", | |
973 | WTMP_FILE, strerror(errno)); | |
974 | ret = 0; | |
975 | } | |
976 | (void)close(fd); | |
1d7b9b20 | 977 | return ret; |
564dd50a | 978 | } |
1d7b9b20 | 979 | |
1d7b9b20 | 980 | static int |
a05a70ab | 981 | wtmp_perform_login(struct logininfo *li) |
982 | { | |
1d7b9b20 | 983 | struct utmp ut; |
984 | ||
985 | construct_utmp(li, &ut); | |
986 | return wtmp_write(li, &ut); | |
564dd50a | 987 | } |
1d7b9b20 | 988 | |
989 | ||
990 | static int | |
564dd50a | 991 | wtmp_perform_logout(struct logininfo *li) |
992 | { | |
1d7b9b20 | 993 | struct utmp ut; |
994 | ||
995 | construct_utmp(li, &ut); | |
1d7b9b20 | 996 | return wtmp_write(li, &ut); |
564dd50a | 997 | } |
1d7b9b20 | 998 | |
999 | ||
1000 | int | |
564dd50a | 1001 | wtmp_write_entry(struct logininfo *li) |
1002 | { | |
1d7b9b20 | 1003 | switch(li->type) { |
1004 | case LTYPE_LOGIN: | |
1005 | return wtmp_perform_login(li); | |
1006 | case LTYPE_LOGOUT: | |
1007 | return wtmp_perform_logout(li); | |
1008 | default: | |
1009 | log("wtmp_write_entry: invalid type field"); | |
1010 | return 0; | |
1011 | } | |
564dd50a | 1012 | } |
1d7b9b20 | 1013 | |
1014 | ||
5abcdf8e | 1015 | /* Notes on fetching login data from wtmp/wtmpx |
1016 | * | |
1017 | * Logouts are usually recorded with (amongst other things) a blank | |
1018 | * username on a given tty line. However, some systems (HP-UX is one) | |
1019 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1020 | * | |
1021 | * Since we're only looking for logins here, we know that the username | |
1022 | * must be set correctly. On systems that leave it in, we check for | |
1023 | * ut_type==USER_PROCESS (indicating a login.) | |
1024 | * | |
1025 | * Portability: Some systems may set something other than USER_PROCESS | |
1026 | * to indicate a login process. I don't know of any as I write. Also, | |
1027 | * it's possible that some systems may both leave the username in | |
1028 | * place and not have ut_type. | |
1029 | */ | |
1030 | ||
5abcdf8e | 1031 | /* return true if this wtmp entry indicates a login */ |
1032 | static int | |
1033 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1034 | { | |
dc2a6d09 | 1035 | if (strncmp(li->username, ut->ut_name, |
1036 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { | |
a05a70ab | 1037 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 1038 | if (ut->ut_type & USER_PROCESS) |
1039 | return 1; | |
a05a70ab | 1040 | # else |
5abcdf8e | 1041 | return 1; |
a05a70ab | 1042 | # endif |
5abcdf8e | 1043 | } |
1044 | return 0; | |
1045 | } | |
1046 | ||
1d7b9b20 | 1047 | int |
564dd50a | 1048 | wtmp_get_entry(struct logininfo *li) |
1049 | { | |
1d7b9b20 | 1050 | struct stat st; |
1051 | struct utmp ut; | |
5abcdf8e | 1052 | int fd, found=0; |
1053 | ||
1054 | /* Clear the time entries in our logininfo */ | |
1055 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1056 | |
1057 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
1058 | log("wtmp_get_entry: problem opening %s: %s", | |
1059 | WTMP_FILE, strerror(errno)); | |
1060 | return 0; | |
1061 | } | |
564dd50a | 1062 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1063 | log("wtmp_get_entry: couldn't stat %s: %s", |
1064 | WTMP_FILE, strerror(errno)); | |
1065 | close(fd); | |
1066 | return 0; | |
1067 | } | |
1d7b9b20 | 1068 | |
5abcdf8e | 1069 | /* Seek to the start of the last struct utmp */ |
dbaa2e87 | 1070 | if (lseek(fd, (off_t)(0 - sizeof(struct utmp)), SEEK_END) == -1) { |
5abcdf8e | 1071 | /* Looks like we've got a fresh wtmp file */ |
1072 | close(fd); | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | while (!found) { | |
9f32ceb4 | 1077 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { |
1d7b9b20 | 1078 | log("wtmp_get_entry: read of %s failed: %s", |
1079 | WTMP_FILE, strerror(errno)); | |
1080 | close (fd); | |
1081 | return 0; | |
1082 | } | |
5abcdf8e | 1083 | if ( wtmp_islogin(li, &ut) ) { |
1084 | found = 1; | |
1085 | /* We've already checked for a time in struct | |
1086 | * utmp, in login_getlast(). */ | |
a05a70ab | 1087 | # ifdef HAVE_TIME_IN_UTMP |
1d7b9b20 | 1088 | li->tv_sec = ut.ut_time; |
a05a70ab | 1089 | # else |
1d7b9b20 | 1090 | # if HAVE_TV_IN_UTMP |
1091 | li->tv_sec = ut.ut_tv.tv_sec; | |
1092 | # endif | |
a05a70ab | 1093 | # endif |
5abcdf8e | 1094 | line_fullname(li->line, ut.ut_line, |
1095 | MIN_SIZEOF(li->line, ut.ut_line)); | |
a05a70ab | 1096 | # ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 1097 | strlcpy(li->hostname, ut.ut_host, |
1098 | MIN_SIZEOF(li->hostname, ut.ut_host)); | |
a05a70ab | 1099 | # endif |
5abcdf8e | 1100 | continue; |
1d7b9b20 | 1101 | } |
5abcdf8e | 1102 | /* Seek back 2 x struct utmp */ |
1d7b9b20 | 1103 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) { |
5abcdf8e | 1104 | /* We've found the start of the file, so quit */ |
1d7b9b20 | 1105 | close (fd); |
1106 | return 0; | |
1107 | } | |
5abcdf8e | 1108 | } |
1109 | ||
1110 | /* We found an entry. Tidy up and return */ | |
1111 | close(fd); | |
1d7b9b20 | 1112 | return 1; |
564dd50a | 1113 | } |
a05a70ab | 1114 | # endif /* USE_WTMP */ |
1d7b9b20 | 1115 | |
1116 | ||
1117 | /** | |
564dd50a | 1118 | ** Low-level wtmpx functions |
1d7b9b20 | 1119 | **/ |
1120 | ||
1121 | #ifdef USE_WTMPX | |
1d7b9b20 | 1122 | /* write a wtmpx entry direct to the end of the file */ |
564dd50a | 1123 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 1124 | static int |
564dd50a | 1125 | wtmpx_write(struct logininfo *li, struct utmpx *utx) |
1126 | { | |
1d7b9b20 | 1127 | struct stat buf; |
1128 | int fd, ret = 1; | |
1129 | ||
1130 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1131 | log("wtmpx_write: problem opening %s: %s", | |
1132 | WTMPX_FILE, strerror(errno)); | |
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | if (fstat(fd, &buf) == 0) | |
9f32ceb4 | 1137 | if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) { |
1d7b9b20 | 1138 | ftruncate(fd, buf.st_size); |
1139 | log("wtmpx_write: problem writing %s: %s", | |
1140 | WTMPX_FILE, strerror(errno)); | |
1141 | ret = 0; | |
1142 | } | |
1143 | (void)close(fd); | |
1144 | ||
1145 | return ret; | |
564dd50a | 1146 | } |
1d7b9b20 | 1147 | |
1148 | ||
1149 | static int | |
564dd50a | 1150 | wtmpx_perform_login(struct logininfo *li) |
1151 | { | |
1d7b9b20 | 1152 | struct utmpx utx; |
1153 | ||
1154 | construct_utmpx(li, &utx); | |
1155 | return wtmpx_write(li, &utx); | |
564dd50a | 1156 | } |
1d7b9b20 | 1157 | |
1158 | ||
1159 | static int | |
564dd50a | 1160 | wtmpx_perform_logout(struct logininfo *li) |
1161 | { | |
1d7b9b20 | 1162 | struct utmpx utx; |
1163 | ||
1164 | construct_utmpx(li, &utx); | |
1d7b9b20 | 1165 | return wtmpx_write(li, &utx); |
564dd50a | 1166 | } |
1d7b9b20 | 1167 | |
1168 | ||
1169 | int | |
564dd50a | 1170 | wtmpx_write_entry(struct logininfo *li) |
1171 | { | |
1d7b9b20 | 1172 | switch(li->type) { |
1173 | case LTYPE_LOGIN: | |
1174 | return wtmpx_perform_login(li); | |
1175 | case LTYPE_LOGOUT: | |
1176 | return wtmpx_perform_logout(li); | |
1177 | default: | |
1178 | log("wtmpx_write_entry: invalid type field"); | |
1179 | return 0; | |
1180 | } | |
564dd50a | 1181 | } |
1d7b9b20 | 1182 | |
5abcdf8e | 1183 | /* Please see the notes above wtmp_islogin() for information about the |
1184 | next two functions */ | |
1185 | ||
1186 | /* Return true if this wtmpx entry indicates a login */ | |
1187 | static int | |
1188 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1189 | { | |
dc2a6d09 | 1190 | if ( strncmp(li->username, utx->ut_name, |
1191 | MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) { | |
a05a70ab | 1192 | # ifdef HAVE_TYPE_IN_UTMPX |
5abcdf8e | 1193 | if (utx->ut_type == USER_PROCESS) |
1194 | return 1; | |
a05a70ab | 1195 | # else |
5abcdf8e | 1196 | return 1; |
a05a70ab | 1197 | # endif |
5abcdf8e | 1198 | } |
1199 | return 0; | |
1200 | } | |
1201 | ||
1d7b9b20 | 1202 | |
1203 | int | |
564dd50a | 1204 | wtmpx_get_entry(struct logininfo *li) |
1205 | { | |
1d7b9b20 | 1206 | struct stat st; |
1207 | struct utmpx utx; | |
5abcdf8e | 1208 | int fd, found=0; |
1209 | ||
1210 | /* Clear the time entries */ | |
1211 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1212 | |
1213 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1214 | log("wtmpx_get_entry: problem opening %s: %s", | |
1215 | WTMPX_FILE, strerror(errno)); | |
1216 | return 0; | |
1217 | } | |
564dd50a | 1218 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1219 | log("wtmpx_get_entry: couldn't stat %s: %s", |
1220 | WTMP_FILE, strerror(errno)); | |
1221 | close(fd); | |
1222 | return 0; | |
1223 | } | |
5abcdf8e | 1224 | |
1225 | /* Seek to the start of the last struct utmpx */ | |
1226 | if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) { | |
1227 | /* probably a newly rotated wtmpx file */ | |
1228 | close(fd); | |
1229 | return 0; | |
1230 | } | |
1d7b9b20 | 1231 | |
5abcdf8e | 1232 | while (!found) { |
9f32ceb4 | 1233 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { |
1d7b9b20 | 1234 | log("wtmpx_get_entry: read of %s failed: %s", |
1235 | WTMPX_FILE, strerror(errno)); | |
1236 | close (fd); | |
1237 | return 0; | |
1238 | } | |
1d7b9b20 | 1239 | /* Logouts are recorded as a blank username on a particular line. |
1240 | * So, we just need to find the username in struct utmpx */ | |
5abcdf8e | 1241 | if ( wtmpx_islogin(li, &utx) ) { |
a05a70ab | 1242 | # ifdef HAVE_TV_IN_UTMPX |
1d7b9b20 | 1243 | li->tv_sec = utx.ut_tv.tv_sec; |
a05a70ab | 1244 | # else |
1d7b9b20 | 1245 | # ifdef HAVE_TIME_IN_UTMPX |
1246 | li->tv_sec = utx.ut_time; | |
1247 | # endif | |
a05a70ab | 1248 | # endif |
a4d05724 | 1249 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); |
a05a70ab | 1250 | # ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 1251 | strlcpy(li->hostname, utx.ut_host, |
1252 | MIN_SIZEOF(li->hostname, utx.ut_host)); | |
a05a70ab | 1253 | # endif |
5abcdf8e | 1254 | continue; |
1d7b9b20 | 1255 | } |
1256 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1257 | close (fd); | |
1258 | return 0; | |
1259 | } | |
5abcdf8e | 1260 | } |
1261 | ||
1262 | close(fd); | |
1d7b9b20 | 1263 | return 1; |
564dd50a | 1264 | } |
f988dce5 | 1265 | #endif /* USE_WTMPX */ |
1d7b9b20 | 1266 | |
1d7b9b20 | 1267 | /** |
564dd50a | 1268 | ** Low-level libutil login() functions |
1d7b9b20 | 1269 | **/ |
1270 | ||
1271 | #ifdef USE_LOGIN | |
1d7b9b20 | 1272 | static int |
564dd50a | 1273 | syslogin_perform_login(struct logininfo *li) |
1274 | { | |
1d7b9b20 | 1275 | struct utmp *ut; |
1276 | ||
dbaa2e87 | 1277 | if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) { |
1d7b9b20 | 1278 | log("syslogin_perform_login: couldn't malloc()"); |
1279 | return 0; | |
1280 | } | |
1281 | construct_utmp(li, ut); | |
1282 | login(ut); | |
1283 | ||
1284 | return 1; | |
564dd50a | 1285 | } |
1d7b9b20 | 1286 | |
564dd50a | 1287 | static int |
1288 | syslogin_perform_logout(struct logininfo *li) | |
1289 | { | |
a05a70ab | 1290 | # ifdef HAVE_LOGOUT |
1d7b9b20 | 1291 | char line[8]; |
1292 | ||
1293 | (void)line_stripname(line, li->line, sizeof(line)); | |
1294 | ||
1295 | if (!logout(line)) { | |
1296 | log("syslogin_perform_logout: logout() returned an error"); | |
a05a70ab | 1297 | # ifdef HAVE_LOGWTMP |
1d7b9b20 | 1298 | } else { |
1299 | logwtmp(line, "", ""); | |
a05a70ab | 1300 | # endif |
5637650d | 1301 | } |
5abcdf8e | 1302 | /* FIXME: (ATL - if the need arises) What to do if we have |
1303 | * login, but no logout? what if logout but no logwtmp? All | |
1304 | * routines are in libutil so they should all be there, | |
1305 | * but... */ | |
a05a70ab | 1306 | # endif |
1d7b9b20 | 1307 | return 1; |
564dd50a | 1308 | } |
1d7b9b20 | 1309 | |
1d7b9b20 | 1310 | int |
564dd50a | 1311 | syslogin_write_entry(struct logininfo *li) |
1312 | { | |
1d7b9b20 | 1313 | switch (li->type) { |
1314 | case LTYPE_LOGIN: | |
1315 | return syslogin_perform_login(li); | |
1316 | case LTYPE_LOGOUT: | |
1317 | return syslogin_perform_logout(li); | |
1318 | default: | |
1319 | log("syslogin_write_entry: Invalid type field"); | |
1320 | return 0; | |
1321 | } | |
564dd50a | 1322 | } |
f988dce5 | 1323 | #endif /* USE_LOGIN */ |
1d7b9b20 | 1324 | |
1325 | /* end of file log-syslogin.c */ | |
1326 | ||
1d7b9b20 | 1327 | /** |
564dd50a | 1328 | ** Low-level lastlog functions |
1d7b9b20 | 1329 | **/ |
1330 | ||
1331 | #ifdef USE_LASTLOG | |
a05a70ab | 1332 | #define LL_FILE 1 |
1333 | #define LL_DIR 2 | |
1334 | #define LL_OTHER 3 | |
1d7b9b20 | 1335 | |
1d7b9b20 | 1336 | static void |
564dd50a | 1337 | lastlog_construct(struct logininfo *li, struct lastlog *last) |
1338 | { | |
1d7b9b20 | 1339 | /* clear the structure */ |
dbaa2e87 | 1340 | memset(last, '\0', sizeof(*last)); |
1d7b9b20 | 1341 | |
a05a70ab | 1342 | (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line)); |
5abcdf8e | 1343 | strlcpy(last->ll_host, li->hostname, |
1344 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1d7b9b20 | 1345 | last->ll_time = li->tv_sec; |
564dd50a | 1346 | } |
1d7b9b20 | 1347 | |
1d7b9b20 | 1348 | static int |
564dd50a | 1349 | lastlog_filetype(char *filename) |
1350 | { | |
1d7b9b20 | 1351 | struct stat st; |
1352 | ||
a05a70ab | 1353 | if (stat(LASTLOG_FILE, &st) != 0) { |
1354 | log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE, | |
1355 | strerror(errno)); | |
1d7b9b20 | 1356 | return 0; |
1357 | } | |
1d7b9b20 | 1358 | if (S_ISDIR(st.st_mode)) |
1359 | return LL_DIR; | |
1360 | else if (S_ISREG(st.st_mode)) | |
1361 | return LL_FILE; | |
1362 | else | |
1363 | return LL_OTHER; | |
564dd50a | 1364 | } |
1d7b9b20 | 1365 | |
1366 | ||
1367 | /* open the file (using filemode) and seek to the login entry */ | |
1368 | static int | |
564dd50a | 1369 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) |
1370 | { | |
1d7b9b20 | 1371 | off_t offset; |
1372 | int type; | |
1373 | char lastlog_file[1024]; | |
1374 | ||
1375 | type = lastlog_filetype(LASTLOG_FILE); | |
1376 | switch (type) { | |
d8caae24 | 1377 | case LL_FILE: |
1378 | strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); | |
1379 | break; | |
1380 | case LL_DIR: | |
1381 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1382 | LASTLOG_FILE, li->username); | |
1383 | break; | |
1384 | default: | |
1385 | log("lastlog_openseek: %.100s is not a file or directory!", | |
1386 | LASTLOG_FILE); | |
1387 | return 0; | |
a05a70ab | 1388 | } |
1d7b9b20 | 1389 | |
1390 | *fd = open(lastlog_file, filemode); | |
1391 | if ( *fd < 0) { | |
9f32ceb4 | 1392 | debug("lastlog_openseek: Couldn't open %s: %s", |
1d7b9b20 | 1393 | lastlog_file, strerror(errno)); |
1394 | return 0; | |
1395 | } | |
a05a70ab | 1396 | |
d93a7e5a | 1397 | if (type == LL_FILE) { |
1398 | /* find this uid's offset in the lastlog file */ | |
1399 | offset = (off_t) ( (long)li->uid * sizeof(struct lastlog)); | |
1d7b9b20 | 1400 | |
d93a7e5a | 1401 | if ( lseek(*fd, offset, SEEK_SET) != offset ) { |
1402 | log("lastlog_openseek: %s->lseek(): %s", | |
1403 | lastlog_file, strerror(errno)); | |
1404 | return 0; | |
1405 | } | |
1d7b9b20 | 1406 | } |
d93a7e5a | 1407 | |
1d7b9b20 | 1408 | return 1; |
564dd50a | 1409 | } |
1d7b9b20 | 1410 | |
1411 | static int | |
564dd50a | 1412 | lastlog_perform_login(struct logininfo *li) |
1413 | { | |
1d7b9b20 | 1414 | struct lastlog last; |
1415 | int fd; | |
1416 | ||
1417 | /* create our struct lastlog */ | |
1418 | lastlog_construct(li, &last); | |
1419 | ||
1a022229 | 1420 | if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) |
1421 | return(0); | |
1422 | ||
1d7b9b20 | 1423 | /* write the entry */ |
1a022229 | 1424 | if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) { |
1425 | close(fd); | |
1426 | log("lastlog_write_filemode: Error writing to %s: %s", | |
1427 | LASTLOG_FILE, strerror(errno)); | |
1d7b9b20 | 1428 | return 0; |
a05a70ab | 1429 | } |
1a022229 | 1430 | |
1431 | close(fd); | |
1432 | return 1; | |
564dd50a | 1433 | } |
1d7b9b20 | 1434 | |
1d7b9b20 | 1435 | int |
564dd50a | 1436 | lastlog_write_entry(struct logininfo *li) |
1437 | { | |
1d7b9b20 | 1438 | switch(li->type) { |
1439 | case LTYPE_LOGIN: | |
1440 | return lastlog_perform_login(li); | |
1441 | default: | |
1442 | log("lastlog_write_entry: Invalid type field"); | |
1443 | return 0; | |
1444 | } | |
564dd50a | 1445 | } |
1d7b9b20 | 1446 | |
1d7b9b20 | 1447 | static void |
564dd50a | 1448 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) |
1449 | { | |
1d7b9b20 | 1450 | line_fullname(li->line, last->ll_line, sizeof(li->line)); |
a05a70ab | 1451 | strlcpy(li->hostname, last->ll_host, |
5abcdf8e | 1452 | MIN_SIZEOF(li->hostname, last->ll_host)); |
1d7b9b20 | 1453 | li->tv_sec = last->ll_time; |
564dd50a | 1454 | } |
1d7b9b20 | 1455 | |
1d7b9b20 | 1456 | int |
564dd50a | 1457 | lastlog_get_entry(struct logininfo *li) |
1458 | { | |
1d7b9b20 | 1459 | struct lastlog last; |
1460 | int fd; | |
1461 | ||
1462 | if (lastlog_openseek(li, &fd, O_RDONLY)) { | |
9f32ceb4 | 1463 | if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) { |
1464 | log("lastlog_get_entry: Error reading from %s: %s", | |
1d7b9b20 | 1465 | LASTLOG_FILE, strerror(errno)); |
1466 | return 0; | |
1467 | } else { | |
1468 | lastlog_populate_entry(li, &last); | |
1469 | return 1; | |
1470 | } | |
a05a70ab | 1471 | } else { |
1d7b9b20 | 1472 | return 0; |
a05a70ab | 1473 | } |
564dd50a | 1474 | } |
f988dce5 | 1475 | #endif /* USE_LASTLOG */ |