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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); |
89d7510a | 515 | #ifdef sgi |
516 | if (strncmp(src, "/dev/tty", 8) == 0) | |
517 | strlcpy(dst, src + 8, dstsize); | |
518 | #else | |
1d7b9b20 | 519 | if (strncmp(src, "/dev/", 5) == 0) |
89d7510a | 520 | strlcpy(dst, src + 5, dstsize); |
521 | #endif | |
1d7b9b20 | 522 | else |
523 | strlcpy(dst, src, dstsize); | |
524 | return dst; | |
564dd50a | 525 | } |
526 | ||
564dd50a | 527 | /* line_abbrevname(): Return the abbreviated (usually four-character) |
528 | * form of the line (Just use the last <dstsize> characters of the | |
529 | * full name.) | |
530 | * | |
531 | * NOTE: use strncpy because we do NOT necessarily want zero | |
532 | * termination */ | |
1d7b9b20 | 533 | char * |
a05a70ab | 534 | line_abbrevname(char *dst, const char *src, int dstsize) |
535 | { | |
536 | size_t len; | |
537 | ||
1d7b9b20 | 538 | memset(dst, '\0', dstsize); |
a05a70ab | 539 | |
daaff4d5 | 540 | /* Always skip prefix if present */ |
89d7510a | 541 | #ifdef sgi |
542 | if (strncmp(src, "/dev/tty", 8) == 0) | |
543 | src += 8; | |
544 | #else | |
daaff4d5 | 545 | if (strncmp(src, "/dev/", 5) == 0) |
546 | src += 5; | |
89d7510a | 547 | #endif |
daaff4d5 | 548 | |
a05a70ab | 549 | len = strlen(src); |
550 | ||
daaff4d5 | 551 | if (len > 0) { |
552 | if (((int)len - dstsize) > 0) | |
553 | src += ((int)len - dstsize); | |
554 | ||
555 | /* note: _don't_ change this to strlcpy */ | |
556 | strncpy(dst, src, (size_t)dstsize); | |
a05a70ab | 557 | } |
558 | ||
1d7b9b20 | 559 | return dst; |
560 | } | |
561 | ||
1d7b9b20 | 562 | /** |
563 | ** utmp utility functions | |
564dd50a | 564 | ** |
565 | ** These functions manipulate struct utmp, taking system differences | |
566 | ** into account. | |
1d7b9b20 | 567 | **/ |
568 | ||
569 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
570 | ||
1d7b9b20 | 571 | /* build the utmp structure */ |
572 | void | |
564dd50a | 573 | set_utmp_time(struct logininfo *li, struct utmp *ut) |
574 | { | |
a05a70ab | 575 | # ifdef HAVE_TV_IN_UTMP |
1d7b9b20 | 576 | ut->ut_tv.tv_sec = li->tv_sec; |
577 | ut->ut_tv.tv_usec = li->tv_usec; | |
a05a70ab | 578 | # else |
1d7b9b20 | 579 | # ifdef HAVE_TIME_IN_UTMP |
580 | ut->ut_time = li->tv_sec; | |
581 | # endif | |
a05a70ab | 582 | # endif |
1d7b9b20 | 583 | } |
584 | ||
585 | void | |
586 | construct_utmp(struct logininfo *li, | |
564dd50a | 587 | struct utmp *ut) |
588 | { | |
dbaa2e87 | 589 | memset(ut, '\0', sizeof(*ut)); |
5abcdf8e | 590 | |
591 | /* First fill out fields used for both logins and logouts */ | |
592 | ||
a05a70ab | 593 | # ifdef HAVE_ID_IN_UTMP |
1d7b9b20 | 594 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); |
a05a70ab | 595 | # endif |
1d7b9b20 | 596 | |
a05a70ab | 597 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 598 | /* This is done here to keep utmp constants out of struct logininfo */ |
1d7b9b20 | 599 | switch (li->type) { |
600 | case LTYPE_LOGIN: | |
601 | ut->ut_type = USER_PROCESS; | |
602 | break; | |
603 | case LTYPE_LOGOUT: | |
604 | ut->ut_type = DEAD_PROCESS; | |
605 | break; | |
606 | } | |
a05a70ab | 607 | # endif |
5abcdf8e | 608 | set_utmp_time(li, ut); |
1d7b9b20 | 609 | |
5abcdf8e | 610 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); |
a05a70ab | 611 | |
612 | # ifdef HAVE_PID_IN_UTMP | |
1d7b9b20 | 613 | ut->ut_pid = li->pid; |
a05a70ab | 614 | # endif |
5abcdf8e | 615 | |
616 | /* If we're logging out, leave all other fields blank */ | |
617 | if (li->type == LTYPE_LOGOUT) | |
618 | return; | |
619 | ||
a05a70ab | 620 | /* |
621 | * These fields are only used when logging in, and are blank | |
622 | * for logouts. | |
623 | */ | |
5abcdf8e | 624 | |
625 | /* Use strncpy because we don't necessarily want null termination */ | |
dc2a6d09 | 626 | strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username)); |
a05a70ab | 627 | # ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 628 | strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname)); |
a05a70ab | 629 | # endif |
630 | # ifdef HAVE_ADDR_IN_UTMP | |
564dd50a | 631 | /* this is just a 32-bit IP address */ |
632 | if (li->hostaddr.sa.sa_family == AF_INET) | |
633 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
a05a70ab | 634 | # endif |
564dd50a | 635 | } |
a05a70ab | 636 | #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ |
564dd50a | 637 | |
1d7b9b20 | 638 | /** |
639 | ** utmpx utility functions | |
564dd50a | 640 | ** |
641 | ** These functions manipulate struct utmpx, accounting for system | |
642 | ** variations. | |
1d7b9b20 | 643 | **/ |
644 | ||
645 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
1d7b9b20 | 646 | /* build the utmpx structure */ |
647 | void | |
564dd50a | 648 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) |
649 | { | |
a05a70ab | 650 | # ifdef HAVE_TV_IN_UTMPX |
1d7b9b20 | 651 | utx->ut_tv.tv_sec = li->tv_sec; |
652 | utx->ut_tv.tv_usec = li->tv_usec; | |
a05a70ab | 653 | # else /* HAVE_TV_IN_UTMPX */ |
1d7b9b20 | 654 | # ifdef HAVE_TIME_IN_UTMPX |
655 | utx->ut_time = li->tv_sec; | |
a05a70ab | 656 | # endif /* HAVE_TIME_IN_UTMPX */ |
657 | # endif /* HAVE_TV_IN_UTMPX */ | |
1d7b9b20 | 658 | } |
659 | ||
660 | void | |
564dd50a | 661 | construct_utmpx(struct logininfo *li, struct utmpx *utx) |
662 | { | |
dbaa2e87 | 663 | memset(utx, '\0', sizeof(*utx)); |
daaff4d5 | 664 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 665 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); |
daaff4d5 | 666 | # endif |
1d7b9b20 | 667 | |
668 | /* this is done here to keep utmp constants out of loginrec.h */ | |
669 | switch (li->type) { | |
670 | case LTYPE_LOGIN: | |
671 | utx->ut_type = USER_PROCESS; | |
672 | break; | |
673 | case LTYPE_LOGOUT: | |
674 | utx->ut_type = DEAD_PROCESS; | |
675 | break; | |
676 | } | |
1d7b9b20 | 677 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); |
1d7b9b20 | 678 | set_utmpx_time(li, utx); |
5abcdf8e | 679 | utx->ut_pid = li->pid; |
680 | ||
681 | if (li->type == LTYPE_LOGOUT) | |
682 | return; | |
683 | ||
a05a70ab | 684 | /* |
685 | * These fields are only used when logging in, and are blank | |
686 | * for logouts. | |
687 | */ | |
5abcdf8e | 688 | |
689 | /* strncpy(): Don't necessarily want null termination */ | |
dc2a6d09 | 690 | strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username)); |
a05a70ab | 691 | # ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 692 | strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname)); |
a05a70ab | 693 | # endif |
694 | # ifdef HAVE_ADDR_IN_UTMPX | |
764d4113 | 695 | /* this is just a 32-bit IP address */ |
696 | if (li->hostaddr.sa.sa_family == AF_INET) | |
697 | utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
a05a70ab | 698 | # endif |
699 | # ifdef HAVE_SYSLEN_IN_UTMPX | |
5abcdf8e | 700 | /* ut_syslen is the length of the utx_host string */ |
701 | utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); | |
a05a70ab | 702 | # endif |
564dd50a | 703 | } |
a05a70ab | 704 | #endif /* USE_UTMPX || USE_WTMPX */ |
1d7b9b20 | 705 | |
706 | /** | |
564dd50a | 707 | ** Low-level utmp functions |
1d7b9b20 | 708 | **/ |
709 | ||
710 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
1d7b9b20 | 711 | #ifdef USE_UTMP |
712 | ||
1d7b9b20 | 713 | /* if we can, use pututline() etc. */ |
a05a70ab | 714 | # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ |
715 | defined(HAVE_PUTUTLINE) | |
1d7b9b20 | 716 | # define UTMP_USE_LIBRARY |
a05a70ab | 717 | # endif |
1d7b9b20 | 718 | |
719 | ||
720 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
a05a70ab | 721 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 722 | static int |
564dd50a | 723 | utmp_write_library(struct logininfo *li, struct utmp *ut) |
724 | { | |
1d7b9b20 | 725 | setutent(); |
726 | pututline(ut); | |
727 | ||
a05a70ab | 728 | # ifdef HAVE_ENDUTENT |
1d7b9b20 | 729 | endutent(); |
a05a70ab | 730 | # endif |
1d7b9b20 | 731 | return 1; |
564dd50a | 732 | } |
a05a70ab | 733 | # else /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 734 | |
735 | /* write a utmp entry direct to the file */ | |
564dd50a | 736 | /* This is a slightly modification of code in OpenBSD's login.c */ |
1d7b9b20 | 737 | static int |
564dd50a | 738 | utmp_write_direct(struct logininfo *li, struct utmp *ut) |
739 | { | |
1d7b9b20 | 740 | struct utmp old_ut; |
741 | register int fd; | |
742 | int tty; | |
743 | ||
5abcdf8e | 744 | /* FIXME: (ATL) ttyslot() needs local implementation */ |
dbaa2e87 | 745 | |
698d107e | 746 | #if defined(HAVE_GETTTYENT) |
dbaa2e87 | 747 | register struct ttyent *ty; |
748 | ||
749 | tty=0; | |
750 | ||
751 | setttyent(); | |
752 | while ((struct ttyent *)0 != (ty = getttyent())) { | |
753 | tty++; | |
754 | if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) | |
755 | break; | |
756 | } | |
757 | endttyent(); | |
758 | ||
759 | if((struct ttyent *)0 == ty) { | |
760 | log("utmp_write_entry: tty not found"); | |
761 | return(1); | |
762 | } | |
763 | #else /* FIXME */ | |
764 | ||
1d7b9b20 | 765 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ |
766 | ||
698d107e | 767 | #endif /* HAVE_GETTTYENT */ |
dbaa2e87 | 768 | |
1d7b9b20 | 769 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { |
770 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
771 | /* | |
772 | * Prevent luser from zero'ing out ut_host. | |
773 | * If the new ut_line is empty but the old one is not | |
dc2a6d09 | 774 | * and ut_line and ut_name match, preserve the old ut_line. |
1d7b9b20 | 775 | */ |
9f32ceb4 | 776 | if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && |
777 | (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && | |
778 | (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && | |
dc2a6d09 | 779 | (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) { |
1d7b9b20 | 780 | (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); |
9f32ceb4 | 781 | } |
782 | ||
1d7b9b20 | 783 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); |
32eec038 | 784 | if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) |
1d7b9b20 | 785 | log("utmp_write_direct: error writing %s: %s", |
5abcdf8e | 786 | UTMP_FILE, strerror(errno)); |
1d7b9b20 | 787 | |
788 | (void)close(fd); | |
789 | return 1; | |
9f32ceb4 | 790 | } else { |
1d7b9b20 | 791 | return 0; |
9f32ceb4 | 792 | } |
564dd50a | 793 | } |
a05a70ab | 794 | # endif /* UTMP_USE_LIBRARY */ |
1d7b9b20 | 795 | |
796 | static int | |
564dd50a | 797 | utmp_perform_login(struct logininfo *li) |
798 | { | |
1d7b9b20 | 799 | struct utmp ut; |
800 | ||
801 | construct_utmp(li, &ut); | |
a05a70ab | 802 | # ifdef UTMP_USE_LIBRARY |
1d7b9b20 | 803 | if (!utmp_write_library(li, &ut)) { |
5abcdf8e | 804 | log("utmp_perform_login: utmp_write_library() failed"); |
1d7b9b20 | 805 | return 0; |
806 | } | |
a05a70ab | 807 | # else |
1d7b9b20 | 808 | if (!utmp_write_direct(li, &ut)) { |
809 | log("utmp_perform_login: utmp_write_direct() failed"); | |
810 | return 0; | |
811 | } | |
a05a70ab | 812 | # endif |
1d7b9b20 | 813 | return 1; |
564dd50a | 814 | } |
1d7b9b20 | 815 | |
816 | ||
817 | static int | |
564dd50a | 818 | utmp_perform_logout(struct logininfo *li) |
819 | { | |
1d7b9b20 | 820 | struct utmp ut; |
821 | ||
5abcdf8e | 822 | construct_utmp(li, &ut); |
a05a70ab | 823 | # ifdef UTMP_USE_LIBRARY |
5abcdf8e | 824 | if (!utmp_write_library(li, &ut)) { |
825 | log("utmp_perform_logout: utmp_write_library() failed"); | |
826 | return 0; | |
827 | } | |
a05a70ab | 828 | # else |
5abcdf8e | 829 | if (!utmp_write_direct(li, &ut)) { |
830 | log("utmp_perform_logout: utmp_write_direct() failed"); | |
831 | return 0; | |
832 | } | |
a05a70ab | 833 | # endif |
1d7b9b20 | 834 | return 1; |
564dd50a | 835 | } |
1d7b9b20 | 836 | |
837 | ||
838 | int | |
564dd50a | 839 | utmp_write_entry(struct logininfo *li) |
840 | { | |
1d7b9b20 | 841 | switch(li->type) { |
842 | case LTYPE_LOGIN: | |
843 | return utmp_perform_login(li); | |
844 | ||
845 | case LTYPE_LOGOUT: | |
846 | return utmp_perform_logout(li); | |
847 | ||
848 | default: | |
849 | log("utmp_write_entry: invalid type field"); | |
850 | return 0; | |
851 | } | |
564dd50a | 852 | } |
a05a70ab | 853 | #endif /* USE_UTMP */ |
1d7b9b20 | 854 | |
855 | ||
856 | /** | |
564dd50a | 857 | ** Low-level utmpx functions |
1d7b9b20 | 858 | **/ |
859 | ||
860 | /* not much point if we don't want utmpx entries */ | |
861 | #ifdef USE_UTMPX | |
862 | ||
1d7b9b20 | 863 | /* if we have the wherewithall, use pututxline etc. */ |
a05a70ab | 864 | # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ |
865 | defined(HAVE_PUTUTXLINE) | |
1d7b9b20 | 866 | # define UTMPX_USE_LIBRARY |
a05a70ab | 867 | # endif |
1d7b9b20 | 868 | |
869 | ||
870 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
a05a70ab | 871 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 872 | static int |
564dd50a | 873 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) |
874 | { | |
1d7b9b20 | 875 | setutxent(); |
876 | pututxline(utx); | |
877 | ||
a05a70ab | 878 | # ifdef HAVE_ENDUTXENT |
1d7b9b20 | 879 | endutxent(); |
a05a70ab | 880 | # endif |
1d7b9b20 | 881 | return 1; |
564dd50a | 882 | } |
1d7b9b20 | 883 | |
a05a70ab | 884 | # else /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 885 | |
886 | /* write a utmp entry direct to the file */ | |
887 | static int | |
564dd50a | 888 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) |
889 | { | |
1d7b9b20 | 890 | log("utmpx_write_direct: not implemented!"); |
891 | return 0; | |
564dd50a | 892 | } |
a05a70ab | 893 | # endif /* UTMPX_USE_LIBRARY */ |
1d7b9b20 | 894 | |
895 | static int | |
564dd50a | 896 | utmpx_perform_login(struct logininfo *li) |
897 | { | |
1d7b9b20 | 898 | struct utmpx utx; |
899 | ||
900 | construct_utmpx(li, &utx); | |
a05a70ab | 901 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 902 | if (!utmpx_write_library(li, &utx)) { |
903 | log("utmpx_perform_login: utmp_write_library() failed"); | |
904 | return 0; | |
905 | } | |
a05a70ab | 906 | # else |
1d7b9b20 | 907 | if (!utmpx_write_direct(li, &ut)) { |
908 | log("utmpx_perform_login: utmp_write_direct() failed"); | |
909 | return 0; | |
910 | } | |
a05a70ab | 911 | # endif |
1d7b9b20 | 912 | return 1; |
564dd50a | 913 | } |
1d7b9b20 | 914 | |
915 | ||
916 | static int | |
564dd50a | 917 | utmpx_perform_logout(struct logininfo *li) |
918 | { | |
1d7b9b20 | 919 | struct utmpx utx; |
920 | ||
921 | memset(&utx, '\0', sizeof(utx)); | |
922 | set_utmpx_time(li, &utx); | |
923 | line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line)); | |
a05a70ab | 924 | # ifdef HAVE_ID_IN_UTMPX |
1d7b9b20 | 925 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); |
a05a70ab | 926 | # endif |
927 | # ifdef HAVE_TYPE_IN_UTMPX | |
1d7b9b20 | 928 | utx.ut_type = DEAD_PROCESS; |
a05a70ab | 929 | # endif |
1d7b9b20 | 930 | |
a05a70ab | 931 | # ifdef UTMPX_USE_LIBRARY |
1d7b9b20 | 932 | utmpx_write_library(li, &utx); |
a05a70ab | 933 | # else |
1d7b9b20 | 934 | utmpx_write_direct(li, &utx); |
a05a70ab | 935 | # endif |
1d7b9b20 | 936 | return 1; |
564dd50a | 937 | } |
1d7b9b20 | 938 | |
1d7b9b20 | 939 | int |
564dd50a | 940 | utmpx_write_entry(struct logininfo *li) |
941 | { | |
1d7b9b20 | 942 | switch(li->type) { |
943 | case LTYPE_LOGIN: | |
944 | return utmpx_perform_login(li); | |
945 | case LTYPE_LOGOUT: | |
946 | return utmpx_perform_logout(li); | |
947 | default: | |
948 | log("utmpx_write_entry: invalid type field"); | |
949 | return 0; | |
950 | } | |
564dd50a | 951 | } |
a05a70ab | 952 | #endif /* USE_UTMPX */ |
1d7b9b20 | 953 | |
954 | ||
955 | /** | |
564dd50a | 956 | ** Low-level wtmp functions |
1d7b9b20 | 957 | **/ |
958 | ||
959 | #ifdef USE_WTMP | |
960 | ||
1d7b9b20 | 961 | /* write a wtmp entry direct to the end of the file */ |
564dd50a | 962 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 963 | static int |
564dd50a | 964 | wtmp_write(struct logininfo *li, struct utmp *ut) |
965 | { | |
1d7b9b20 | 966 | struct stat buf; |
967 | int fd, ret = 1; | |
968 | ||
969 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
970 | log("wtmp_write: problem writing %s: %s", | |
971 | WTMP_FILE, strerror(errno)); | |
972 | return 0; | |
973 | } | |
564dd50a | 974 | if (fstat(fd, &buf) == 0) |
9f32ceb4 | 975 | if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) { |
1d7b9b20 | 976 | ftruncate(fd, buf.st_size); |
977 | log("wtmp_write: problem writing %s: %s", | |
978 | WTMP_FILE, strerror(errno)); | |
979 | ret = 0; | |
980 | } | |
981 | (void)close(fd); | |
1d7b9b20 | 982 | return ret; |
564dd50a | 983 | } |
1d7b9b20 | 984 | |
1d7b9b20 | 985 | static int |
a05a70ab | 986 | wtmp_perform_login(struct logininfo *li) |
987 | { | |
1d7b9b20 | 988 | struct utmp ut; |
989 | ||
990 | construct_utmp(li, &ut); | |
991 | return wtmp_write(li, &ut); | |
564dd50a | 992 | } |
1d7b9b20 | 993 | |
994 | ||
995 | static int | |
564dd50a | 996 | wtmp_perform_logout(struct logininfo *li) |
997 | { | |
1d7b9b20 | 998 | struct utmp ut; |
999 | ||
1000 | construct_utmp(li, &ut); | |
1d7b9b20 | 1001 | return wtmp_write(li, &ut); |
564dd50a | 1002 | } |
1d7b9b20 | 1003 | |
1004 | ||
1005 | int | |
564dd50a | 1006 | wtmp_write_entry(struct logininfo *li) |
1007 | { | |
1d7b9b20 | 1008 | switch(li->type) { |
1009 | case LTYPE_LOGIN: | |
1010 | return wtmp_perform_login(li); | |
1011 | case LTYPE_LOGOUT: | |
1012 | return wtmp_perform_logout(li); | |
1013 | default: | |
1014 | log("wtmp_write_entry: invalid type field"); | |
1015 | return 0; | |
1016 | } | |
564dd50a | 1017 | } |
1d7b9b20 | 1018 | |
1019 | ||
5abcdf8e | 1020 | /* Notes on fetching login data from wtmp/wtmpx |
1021 | * | |
1022 | * Logouts are usually recorded with (amongst other things) a blank | |
1023 | * username on a given tty line. However, some systems (HP-UX is one) | |
1024 | * leave all fields set, but change the ut_type field to DEAD_PROCESS. | |
1025 | * | |
1026 | * Since we're only looking for logins here, we know that the username | |
1027 | * must be set correctly. On systems that leave it in, we check for | |
1028 | * ut_type==USER_PROCESS (indicating a login.) | |
1029 | * | |
1030 | * Portability: Some systems may set something other than USER_PROCESS | |
1031 | * to indicate a login process. I don't know of any as I write. Also, | |
1032 | * it's possible that some systems may both leave the username in | |
1033 | * place and not have ut_type. | |
1034 | */ | |
1035 | ||
5abcdf8e | 1036 | /* return true if this wtmp entry indicates a login */ |
1037 | static int | |
1038 | wtmp_islogin(struct logininfo *li, struct utmp *ut) | |
1039 | { | |
dc2a6d09 | 1040 | if (strncmp(li->username, ut->ut_name, |
1041 | MIN_SIZEOF(li->username, ut->ut_name)) == 0) { | |
a05a70ab | 1042 | # ifdef HAVE_TYPE_IN_UTMP |
5abcdf8e | 1043 | if (ut->ut_type & USER_PROCESS) |
1044 | return 1; | |
a05a70ab | 1045 | # else |
5abcdf8e | 1046 | return 1; |
a05a70ab | 1047 | # endif |
5abcdf8e | 1048 | } |
1049 | return 0; | |
1050 | } | |
1051 | ||
1d7b9b20 | 1052 | int |
564dd50a | 1053 | wtmp_get_entry(struct logininfo *li) |
1054 | { | |
1d7b9b20 | 1055 | struct stat st; |
1056 | struct utmp ut; | |
5abcdf8e | 1057 | int fd, found=0; |
1058 | ||
1059 | /* Clear the time entries in our logininfo */ | |
1060 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1061 | |
1062 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
1063 | log("wtmp_get_entry: problem opening %s: %s", | |
1064 | WTMP_FILE, strerror(errno)); | |
1065 | return 0; | |
1066 | } | |
564dd50a | 1067 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1068 | log("wtmp_get_entry: couldn't stat %s: %s", |
1069 | WTMP_FILE, strerror(errno)); | |
1070 | close(fd); | |
1071 | return 0; | |
1072 | } | |
1d7b9b20 | 1073 | |
5abcdf8e | 1074 | /* Seek to the start of the last struct utmp */ |
dbaa2e87 | 1075 | if (lseek(fd, (off_t)(0 - sizeof(struct utmp)), SEEK_END) == -1) { |
5abcdf8e | 1076 | /* Looks like we've got a fresh wtmp file */ |
1077 | close(fd); | |
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | while (!found) { | |
9f32ceb4 | 1082 | if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { |
1d7b9b20 | 1083 | log("wtmp_get_entry: read of %s failed: %s", |
1084 | WTMP_FILE, strerror(errno)); | |
1085 | close (fd); | |
1086 | return 0; | |
1087 | } | |
5abcdf8e | 1088 | if ( wtmp_islogin(li, &ut) ) { |
1089 | found = 1; | |
1090 | /* We've already checked for a time in struct | |
1091 | * utmp, in login_getlast(). */ | |
a05a70ab | 1092 | # ifdef HAVE_TIME_IN_UTMP |
1d7b9b20 | 1093 | li->tv_sec = ut.ut_time; |
a05a70ab | 1094 | # else |
1d7b9b20 | 1095 | # if HAVE_TV_IN_UTMP |
1096 | li->tv_sec = ut.ut_tv.tv_sec; | |
1097 | # endif | |
a05a70ab | 1098 | # endif |
5abcdf8e | 1099 | line_fullname(li->line, ut.ut_line, |
1100 | MIN_SIZEOF(li->line, ut.ut_line)); | |
a05a70ab | 1101 | # ifdef HAVE_HOST_IN_UTMP |
5abcdf8e | 1102 | strlcpy(li->hostname, ut.ut_host, |
1103 | MIN_SIZEOF(li->hostname, ut.ut_host)); | |
a05a70ab | 1104 | # endif |
5abcdf8e | 1105 | continue; |
1d7b9b20 | 1106 | } |
5abcdf8e | 1107 | /* Seek back 2 x struct utmp */ |
1d7b9b20 | 1108 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) { |
5abcdf8e | 1109 | /* We've found the start of the file, so quit */ |
1d7b9b20 | 1110 | close (fd); |
1111 | return 0; | |
1112 | } | |
5abcdf8e | 1113 | } |
1114 | ||
1115 | /* We found an entry. Tidy up and return */ | |
1116 | close(fd); | |
1d7b9b20 | 1117 | return 1; |
564dd50a | 1118 | } |
a05a70ab | 1119 | # endif /* USE_WTMP */ |
1d7b9b20 | 1120 | |
1121 | ||
1122 | /** | |
564dd50a | 1123 | ** Low-level wtmpx functions |
1d7b9b20 | 1124 | **/ |
1125 | ||
1126 | #ifdef USE_WTMPX | |
1d7b9b20 | 1127 | /* write a wtmpx entry direct to the end of the file */ |
564dd50a | 1128 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 1129 | static int |
564dd50a | 1130 | wtmpx_write(struct logininfo *li, struct utmpx *utx) |
1131 | { | |
1d7b9b20 | 1132 | struct stat buf; |
1133 | int fd, ret = 1; | |
1134 | ||
1135 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
1136 | log("wtmpx_write: problem opening %s: %s", | |
1137 | WTMPX_FILE, strerror(errno)); | |
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | if (fstat(fd, &buf) == 0) | |
9f32ceb4 | 1142 | if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) { |
1d7b9b20 | 1143 | ftruncate(fd, buf.st_size); |
1144 | log("wtmpx_write: problem writing %s: %s", | |
1145 | WTMPX_FILE, strerror(errno)); | |
1146 | ret = 0; | |
1147 | } | |
1148 | (void)close(fd); | |
1149 | ||
1150 | return ret; | |
564dd50a | 1151 | } |
1d7b9b20 | 1152 | |
1153 | ||
1154 | static int | |
564dd50a | 1155 | wtmpx_perform_login(struct logininfo *li) |
1156 | { | |
1d7b9b20 | 1157 | struct utmpx utx; |
1158 | ||
1159 | construct_utmpx(li, &utx); | |
1160 | return wtmpx_write(li, &utx); | |
564dd50a | 1161 | } |
1d7b9b20 | 1162 | |
1163 | ||
1164 | static int | |
564dd50a | 1165 | wtmpx_perform_logout(struct logininfo *li) |
1166 | { | |
1d7b9b20 | 1167 | struct utmpx utx; |
1168 | ||
1169 | construct_utmpx(li, &utx); | |
1d7b9b20 | 1170 | return wtmpx_write(li, &utx); |
564dd50a | 1171 | } |
1d7b9b20 | 1172 | |
1173 | ||
1174 | int | |
564dd50a | 1175 | wtmpx_write_entry(struct logininfo *li) |
1176 | { | |
1d7b9b20 | 1177 | switch(li->type) { |
1178 | case LTYPE_LOGIN: | |
1179 | return wtmpx_perform_login(li); | |
1180 | case LTYPE_LOGOUT: | |
1181 | return wtmpx_perform_logout(li); | |
1182 | default: | |
1183 | log("wtmpx_write_entry: invalid type field"); | |
1184 | return 0; | |
1185 | } | |
564dd50a | 1186 | } |
1d7b9b20 | 1187 | |
5abcdf8e | 1188 | /* Please see the notes above wtmp_islogin() for information about the |
1189 | next two functions */ | |
1190 | ||
1191 | /* Return true if this wtmpx entry indicates a login */ | |
1192 | static int | |
1193 | wtmpx_islogin(struct logininfo *li, struct utmpx *utx) | |
1194 | { | |
dc2a6d09 | 1195 | if ( strncmp(li->username, utx->ut_name, |
1196 | MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) { | |
a05a70ab | 1197 | # ifdef HAVE_TYPE_IN_UTMPX |
5abcdf8e | 1198 | if (utx->ut_type == USER_PROCESS) |
1199 | return 1; | |
a05a70ab | 1200 | # else |
5abcdf8e | 1201 | return 1; |
a05a70ab | 1202 | # endif |
5abcdf8e | 1203 | } |
1204 | return 0; | |
1205 | } | |
1206 | ||
1d7b9b20 | 1207 | |
1208 | int | |
564dd50a | 1209 | wtmpx_get_entry(struct logininfo *li) |
1210 | { | |
1d7b9b20 | 1211 | struct stat st; |
1212 | struct utmpx utx; | |
5abcdf8e | 1213 | int fd, found=0; |
1214 | ||
1215 | /* Clear the time entries */ | |
1216 | li->tv_sec = li->tv_usec = 0; | |
1d7b9b20 | 1217 | |
1218 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1219 | log("wtmpx_get_entry: problem opening %s: %s", | |
1220 | WTMPX_FILE, strerror(errno)); | |
1221 | return 0; | |
1222 | } | |
564dd50a | 1223 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1224 | log("wtmpx_get_entry: couldn't stat %s: %s", |
1225 | WTMP_FILE, strerror(errno)); | |
1226 | close(fd); | |
1227 | return 0; | |
1228 | } | |
5abcdf8e | 1229 | |
1230 | /* Seek to the start of the last struct utmpx */ | |
1231 | if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) { | |
1232 | /* probably a newly rotated wtmpx file */ | |
1233 | close(fd); | |
1234 | return 0; | |
1235 | } | |
1d7b9b20 | 1236 | |
5abcdf8e | 1237 | while (!found) { |
9f32ceb4 | 1238 | if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { |
1d7b9b20 | 1239 | log("wtmpx_get_entry: read of %s failed: %s", |
1240 | WTMPX_FILE, strerror(errno)); | |
1241 | close (fd); | |
1242 | return 0; | |
1243 | } | |
1d7b9b20 | 1244 | /* Logouts are recorded as a blank username on a particular line. |
1245 | * So, we just need to find the username in struct utmpx */ | |
5abcdf8e | 1246 | if ( wtmpx_islogin(li, &utx) ) { |
a05a70ab | 1247 | # ifdef HAVE_TV_IN_UTMPX |
1d7b9b20 | 1248 | li->tv_sec = utx.ut_tv.tv_sec; |
a05a70ab | 1249 | # else |
1d7b9b20 | 1250 | # ifdef HAVE_TIME_IN_UTMPX |
1251 | li->tv_sec = utx.ut_time; | |
1252 | # endif | |
a05a70ab | 1253 | # endif |
a4d05724 | 1254 | line_fullname(li->line, utx.ut_line, sizeof(li->line)); |
a05a70ab | 1255 | # ifdef HAVE_HOST_IN_UTMPX |
5abcdf8e | 1256 | strlcpy(li->hostname, utx.ut_host, |
1257 | MIN_SIZEOF(li->hostname, utx.ut_host)); | |
a05a70ab | 1258 | # endif |
5abcdf8e | 1259 | continue; |
1d7b9b20 | 1260 | } |
1261 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1262 | close (fd); | |
1263 | return 0; | |
1264 | } | |
5abcdf8e | 1265 | } |
1266 | ||
1267 | close(fd); | |
1d7b9b20 | 1268 | return 1; |
564dd50a | 1269 | } |
f988dce5 | 1270 | #endif /* USE_WTMPX */ |
1d7b9b20 | 1271 | |
1d7b9b20 | 1272 | /** |
564dd50a | 1273 | ** Low-level libutil login() functions |
1d7b9b20 | 1274 | **/ |
1275 | ||
1276 | #ifdef USE_LOGIN | |
1d7b9b20 | 1277 | static int |
564dd50a | 1278 | syslogin_perform_login(struct logininfo *li) |
1279 | { | |
1d7b9b20 | 1280 | struct utmp *ut; |
1281 | ||
dbaa2e87 | 1282 | if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) { |
1d7b9b20 | 1283 | log("syslogin_perform_login: couldn't malloc()"); |
1284 | return 0; | |
1285 | } | |
1286 | construct_utmp(li, ut); | |
1287 | login(ut); | |
1288 | ||
1289 | return 1; | |
564dd50a | 1290 | } |
1d7b9b20 | 1291 | |
564dd50a | 1292 | static int |
1293 | syslogin_perform_logout(struct logininfo *li) | |
1294 | { | |
a05a70ab | 1295 | # ifdef HAVE_LOGOUT |
1d7b9b20 | 1296 | char line[8]; |
1297 | ||
1298 | (void)line_stripname(line, li->line, sizeof(line)); | |
1299 | ||
1300 | if (!logout(line)) { | |
1301 | log("syslogin_perform_logout: logout() returned an error"); | |
a05a70ab | 1302 | # ifdef HAVE_LOGWTMP |
1d7b9b20 | 1303 | } else { |
1304 | logwtmp(line, "", ""); | |
a05a70ab | 1305 | # endif |
5637650d | 1306 | } |
5abcdf8e | 1307 | /* FIXME: (ATL - if the need arises) What to do if we have |
1308 | * login, but no logout? what if logout but no logwtmp? All | |
1309 | * routines are in libutil so they should all be there, | |
1310 | * but... */ | |
a05a70ab | 1311 | # endif |
1d7b9b20 | 1312 | return 1; |
564dd50a | 1313 | } |
1d7b9b20 | 1314 | |
1d7b9b20 | 1315 | int |
564dd50a | 1316 | syslogin_write_entry(struct logininfo *li) |
1317 | { | |
1d7b9b20 | 1318 | switch (li->type) { |
1319 | case LTYPE_LOGIN: | |
1320 | return syslogin_perform_login(li); | |
1321 | case LTYPE_LOGOUT: | |
1322 | return syslogin_perform_logout(li); | |
1323 | default: | |
1324 | log("syslogin_write_entry: Invalid type field"); | |
1325 | return 0; | |
1326 | } | |
564dd50a | 1327 | } |
f988dce5 | 1328 | #endif /* USE_LOGIN */ |
1d7b9b20 | 1329 | |
1330 | /* end of file log-syslogin.c */ | |
1331 | ||
1d7b9b20 | 1332 | /** |
564dd50a | 1333 | ** Low-level lastlog functions |
1d7b9b20 | 1334 | **/ |
1335 | ||
1336 | #ifdef USE_LASTLOG | |
a05a70ab | 1337 | #define LL_FILE 1 |
1338 | #define LL_DIR 2 | |
1339 | #define LL_OTHER 3 | |
1d7b9b20 | 1340 | |
1d7b9b20 | 1341 | static void |
564dd50a | 1342 | lastlog_construct(struct logininfo *li, struct lastlog *last) |
1343 | { | |
1d7b9b20 | 1344 | /* clear the structure */ |
dbaa2e87 | 1345 | memset(last, '\0', sizeof(*last)); |
1d7b9b20 | 1346 | |
a05a70ab | 1347 | (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line)); |
5abcdf8e | 1348 | strlcpy(last->ll_host, li->hostname, |
1349 | MIN_SIZEOF(last->ll_host, li->hostname)); | |
1d7b9b20 | 1350 | last->ll_time = li->tv_sec; |
564dd50a | 1351 | } |
1d7b9b20 | 1352 | |
1d7b9b20 | 1353 | static int |
564dd50a | 1354 | lastlog_filetype(char *filename) |
1355 | { | |
1d7b9b20 | 1356 | struct stat st; |
1357 | ||
a05a70ab | 1358 | if (stat(LASTLOG_FILE, &st) != 0) { |
1359 | log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE, | |
1360 | strerror(errno)); | |
1d7b9b20 | 1361 | return 0; |
1362 | } | |
1d7b9b20 | 1363 | if (S_ISDIR(st.st_mode)) |
1364 | return LL_DIR; | |
1365 | else if (S_ISREG(st.st_mode)) | |
1366 | return LL_FILE; | |
1367 | else | |
1368 | return LL_OTHER; | |
564dd50a | 1369 | } |
1d7b9b20 | 1370 | |
1371 | ||
1372 | /* open the file (using filemode) and seek to the login entry */ | |
1373 | static int | |
564dd50a | 1374 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) |
1375 | { | |
1d7b9b20 | 1376 | off_t offset; |
1377 | int type; | |
1378 | char lastlog_file[1024]; | |
1379 | ||
1380 | type = lastlog_filetype(LASTLOG_FILE); | |
1381 | switch (type) { | |
d8caae24 | 1382 | case LL_FILE: |
1383 | strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); | |
1384 | break; | |
1385 | case LL_DIR: | |
1386 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1387 | LASTLOG_FILE, li->username); | |
1388 | break; | |
1389 | default: | |
1390 | log("lastlog_openseek: %.100s is not a file or directory!", | |
1391 | LASTLOG_FILE); | |
1392 | return 0; | |
a05a70ab | 1393 | } |
1d7b9b20 | 1394 | |
1395 | *fd = open(lastlog_file, filemode); | |
1396 | if ( *fd < 0) { | |
9f32ceb4 | 1397 | debug("lastlog_openseek: Couldn't open %s: %s", |
1d7b9b20 | 1398 | lastlog_file, strerror(errno)); |
1399 | return 0; | |
1400 | } | |
a05a70ab | 1401 | |
d93a7e5a | 1402 | if (type == LL_FILE) { |
1403 | /* find this uid's offset in the lastlog file */ | |
1404 | offset = (off_t) ( (long)li->uid * sizeof(struct lastlog)); | |
1d7b9b20 | 1405 | |
d93a7e5a | 1406 | if ( lseek(*fd, offset, SEEK_SET) != offset ) { |
1407 | log("lastlog_openseek: %s->lseek(): %s", | |
1408 | lastlog_file, strerror(errno)); | |
1409 | return 0; | |
1410 | } | |
1d7b9b20 | 1411 | } |
d93a7e5a | 1412 | |
1d7b9b20 | 1413 | return 1; |
564dd50a | 1414 | } |
1d7b9b20 | 1415 | |
1416 | static int | |
564dd50a | 1417 | lastlog_perform_login(struct logininfo *li) |
1418 | { | |
1d7b9b20 | 1419 | struct lastlog last; |
1420 | int fd; | |
1421 | ||
1422 | /* create our struct lastlog */ | |
1423 | lastlog_construct(li, &last); | |
1424 | ||
1a022229 | 1425 | if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) |
1426 | return(0); | |
1427 | ||
1d7b9b20 | 1428 | /* write the entry */ |
1a022229 | 1429 | if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) { |
1430 | close(fd); | |
1431 | log("lastlog_write_filemode: Error writing to %s: %s", | |
1432 | LASTLOG_FILE, strerror(errno)); | |
1d7b9b20 | 1433 | return 0; |
a05a70ab | 1434 | } |
1a022229 | 1435 | |
1436 | close(fd); | |
1437 | return 1; | |
564dd50a | 1438 | } |
1d7b9b20 | 1439 | |
1d7b9b20 | 1440 | int |
564dd50a | 1441 | lastlog_write_entry(struct logininfo *li) |
1442 | { | |
1d7b9b20 | 1443 | switch(li->type) { |
1444 | case LTYPE_LOGIN: | |
1445 | return lastlog_perform_login(li); | |
1446 | default: | |
1447 | log("lastlog_write_entry: Invalid type field"); | |
1448 | return 0; | |
1449 | } | |
564dd50a | 1450 | } |
1d7b9b20 | 1451 | |
1d7b9b20 | 1452 | static void |
564dd50a | 1453 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) |
1454 | { | |
1d7b9b20 | 1455 | line_fullname(li->line, last->ll_line, sizeof(li->line)); |
a05a70ab | 1456 | strlcpy(li->hostname, last->ll_host, |
5abcdf8e | 1457 | MIN_SIZEOF(li->hostname, last->ll_host)); |
1d7b9b20 | 1458 | li->tv_sec = last->ll_time; |
564dd50a | 1459 | } |
1d7b9b20 | 1460 | |
1d7b9b20 | 1461 | int |
564dd50a | 1462 | lastlog_get_entry(struct logininfo *li) |
1463 | { | |
1d7b9b20 | 1464 | struct lastlog last; |
1465 | int fd; | |
1466 | ||
1467 | if (lastlog_openseek(li, &fd, O_RDONLY)) { | |
9f32ceb4 | 1468 | if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) { |
1469 | log("lastlog_get_entry: Error reading from %s: %s", | |
1d7b9b20 | 1470 | LASTLOG_FILE, strerror(errno)); |
1471 | return 0; | |
1472 | } else { | |
1473 | lastlog_populate_entry(li, &last); | |
1474 | return 1; | |
1475 | } | |
a05a70ab | 1476 | } else { |
1d7b9b20 | 1477 | return 0; |
a05a70ab | 1478 | } |
564dd50a | 1479 | } |
f988dce5 | 1480 | #endif /* USE_LASTLOG */ |