loginrec.c revision 296781
1/* 2 * Copyright (c) 2000 Andre Lucas. All rights reserved. 3 * Portions copyright (c) 1998 Todd C. Miller 4 * Portions copyright (c) 1996 Jason Downs 5 * Portions copyright (c) 1996 Theo de Raadt 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28/* 29 * The btmp logging code is derived from login.c from util-linux and is under 30 * the the following license: 31 * 32 * Copyright (c) 1980, 1987, 1988 The Regents of the University of California. 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms are permitted 36 * provided that the above copyright notice and this paragraph are 37 * duplicated in all such forms and that any documentation, 38 * advertising materials, and other materials related to such 39 * distribution and use acknowledge that the software was developed 40 * by the University of California, Berkeley. The name of the 41 * University may not be used to endorse or promote products derived 42 * from this software without specific prior written permission. 43 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 44 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 45 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 46 */ 47 48 49/** 50 ** loginrec.c: platform-independent login recording and lastlog retrieval 51 **/ 52 53/* 54 * The new login code explained 55 * ============================ 56 * 57 * This code attempts to provide a common interface to login recording 58 * (utmp and friends) and last login time retrieval. 59 * 60 * Its primary means of achieving this is to use 'struct logininfo', a 61 * union of all the useful fields in the various different types of 62 * system login record structures one finds on UNIX variants. 63 * 64 * We depend on autoconf to define which recording methods are to be 65 * used, and which fields are contained in the relevant data structures 66 * on the local system. Many C preprocessor symbols affect which code 67 * gets compiled here. 68 * 69 * The code is designed to make it easy to modify a particular 70 * recording method, without affecting other methods nor requiring so 71 * many nested conditional compilation blocks as were commonplace in 72 * the old code. 73 * 74 * For login recording, we try to use the local system's libraries as 75 * these are clearly most likely to work correctly. For utmp systems 76 * this usually means login() and logout() or setutent() etc., probably 77 * in libutil, along with logwtmp() etc. On these systems, we fall back 78 * to writing the files directly if we have to, though this method 79 * requires very thorough testing so we do not corrupt local auditing 80 * information. These files and their access methods are very system 81 * specific indeed. 82 * 83 * For utmpx systems, the corresponding library functions are 84 * setutxent() etc. To the author's knowledge, all utmpx systems have 85 * these library functions and so no direct write is attempted. If such 86 * a system exists and needs support, direct analogues of the [uw]tmp 87 * code should suffice. 88 * 89 * Retrieving the time of last login ('lastlog') is in some ways even 90 * more problemmatic than login recording. Some systems provide a 91 * simple table of all users which we seek based on uid and retrieve a 92 * relatively standard structure. Others record the same information in 93 * a directory with a separate file, and others don't record the 94 * information separately at all. For systems in the latter category, 95 * we look backwards in the wtmp or wtmpx file for the last login entry 96 * for our user. Naturally this is slower and on busy systems could 97 * incur a significant performance penalty. 98 * 99 * Calling the new code 100 * -------------------- 101 * 102 * In OpenSSH all login recording and retrieval is performed in 103 * login.c. Here you'll find working examples. Also, in the logintest.c 104 * program there are more examples. 105 * 106 * Internal handler calling method 107 * ------------------------------- 108 * 109 * When a call is made to login_login() or login_logout(), both 110 * routines set a struct logininfo flag defining which action (log in, 111 * or log out) is to be taken. They both then call login_write(), which 112 * calls whichever of the many structure-specific handlers autoconf 113 * selects for the local system. 114 * 115 * The handlers themselves handle system data structure specifics. Both 116 * struct utmp and struct utmpx have utility functions (see 117 * construct_utmp*()) to try to make it simpler to add extra systems 118 * that introduce new features to either structure. 119 * 120 * While it may seem terribly wasteful to replicate so much similar 121 * code for each method, experience has shown that maintaining code to 122 * write both struct utmp and utmpx in one function, whilst maintaining 123 * support for all systems whether they have library support or not, is 124 * a difficult and time-consuming task. 125 * 126 * Lastlog support proceeds similarly. Functions login_get_lastlog() 127 * (and its OpenSSH-tuned friend login_get_lastlog_time()) call 128 * getlast_entry(), which tries one of three methods to find the last 129 * login time. It uses local system lastlog support if it can, 130 * otherwise it tries wtmp or wtmpx before giving up and returning 0, 131 * meaning "tilt". 132 * 133 * Maintenance 134 * ----------- 135 * 136 * In many cases it's possible to tweak autoconf to select the correct 137 * methods for a particular platform, either by improving the detection 138 * code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE 139 * symbols for the platform. 140 * 141 * Use logintest to check which symbols are defined before modifying 142 * configure.ac and loginrec.c. (You have to build logintest yourself 143 * with 'make logintest' as it's not built by default.) 144 * 145 * Otherwise, patches to the specific method(s) are very helpful! 146 */ 147 148#include "includes.h" 149 150#include <sys/types.h> 151#include <sys/stat.h> 152#include <sys/socket.h> 153#ifdef HAVE_SYS_TIME_H 154# include <sys/time.h> 155#endif 156 157#include <netinet/in.h> 158 159#include <errno.h> 160#include <fcntl.h> 161#ifdef HAVE_PATHS_H 162# include <paths.h> 163#endif 164#include <pwd.h> 165#include <stdarg.h> 166#include <string.h> 167#include <time.h> 168#include <unistd.h> 169 170#include "xmalloc.h" 171#include "key.h" 172#include "hostfile.h" 173#include "ssh.h" 174#include "loginrec.h" 175#include "log.h" 176#include "atomicio.h" 177#include "packet.h" 178#include "canohost.h" 179#include "auth.h" 180#include "buffer.h" 181 182#ifdef HAVE_UTIL_H 183# include <util.h> 184#endif 185 186/** 187 ** prototypes for helper functions in this file 188 **/ 189 190#if HAVE_UTMP_H 191void set_utmp_time(struct logininfo *li, struct utmp *ut); 192void construct_utmp(struct logininfo *li, struct utmp *ut); 193#endif 194 195#ifdef HAVE_UTMPX_H 196void set_utmpx_time(struct logininfo *li, struct utmpx *ut); 197void construct_utmpx(struct logininfo *li, struct utmpx *ut); 198#endif 199 200int utmp_write_entry(struct logininfo *li); 201int utmpx_write_entry(struct logininfo *li); 202int wtmp_write_entry(struct logininfo *li); 203int wtmpx_write_entry(struct logininfo *li); 204int lastlog_write_entry(struct logininfo *li); 205int syslogin_write_entry(struct logininfo *li); 206 207int getlast_entry(struct logininfo *li); 208int lastlog_get_entry(struct logininfo *li); 209int utmpx_get_entry(struct logininfo *li); 210int wtmp_get_entry(struct logininfo *li); 211int wtmpx_get_entry(struct logininfo *li); 212 213extern Buffer loginmsg; 214 215/* pick the shortest string */ 216#define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2)) 217 218/** 219 ** platform-independent login functions 220 **/ 221 222/* 223 * login_login(struct logininfo *) - Record a login 224 * 225 * Call with a pointer to a struct logininfo initialised with 226 * login_init_entry() or login_alloc_entry() 227 * 228 * Returns: 229 * >0 if successful 230 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 231 */ 232int 233login_login(struct logininfo *li) 234{ 235 li->type = LTYPE_LOGIN; 236 return (login_write(li)); 237} 238 239 240/* 241 * login_logout(struct logininfo *) - Record a logout 242 * 243 * Call as with login_login() 244 * 245 * Returns: 246 * >0 if successful 247 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 248 */ 249int 250login_logout(struct logininfo *li) 251{ 252 li->type = LTYPE_LOGOUT; 253 return (login_write(li)); 254} 255 256/* 257 * login_get_lastlog_time(int) - Retrieve the last login time 258 * 259 * Retrieve the last login time for the given uid. Will try to use the 260 * system lastlog facilities if they are available, but will fall back 261 * to looking in wtmp/wtmpx if necessary 262 * 263 * Returns: 264 * 0 on failure, or if user has never logged in 265 * Time in seconds from the epoch if successful 266 * 267 * Useful preprocessor symbols: 268 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog 269 * info 270 * USE_LASTLOG: If set, indicates the presence of system lastlog 271 * facilities. If this and DISABLE_LASTLOG are not set, 272 * try to retrieve lastlog information from wtmp/wtmpx. 273 */ 274unsigned int 275login_get_lastlog_time(const uid_t uid) 276{ 277 struct logininfo li; 278 279 if (login_get_lastlog(&li, uid)) 280 return (li.tv_sec); 281 else 282 return (0); 283} 284 285/* 286 * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry 287 * 288 * Retrieve a logininfo structure populated (only partially) with 289 * information from the system lastlog data, or from wtmp/wtmpx if no 290 * system lastlog information exists. 291 * 292 * Note this routine must be given a pre-allocated logininfo. 293 * 294 * Returns: 295 * >0: A pointer to your struct logininfo if successful 296 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 297 */ 298struct logininfo * 299login_get_lastlog(struct logininfo *li, const uid_t uid) 300{ 301 struct passwd *pw; 302 303 memset(li, '\0', sizeof(*li)); 304 li->uid = uid; 305 306 /* 307 * If we don't have a 'real' lastlog, we need the username to 308 * reliably search wtmp(x) for the last login (see 309 * wtmp_get_entry().) 310 */ 311 pw = getpwuid(uid); 312 if (pw == NULL) 313 fatal("%s: Cannot find account for uid %ld", __func__, 314 (long)uid); 315 316 if (strlcpy(li->username, pw->pw_name, sizeof(li->username)) >= 317 sizeof(li->username)) { 318 error("%s: username too long (%lu > max %lu)", __func__, 319 (unsigned long)strlen(pw->pw_name), 320 (unsigned long)sizeof(li->username) - 1); 321 return NULL; 322 } 323 324 if (getlast_entry(li)) 325 return (li); 326 else 327 return (NULL); 328} 329 330/* 331 * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise 332 * a logininfo structure 333 * 334 * This function creates a new struct logininfo, a data structure 335 * meant to carry the information required to portably record login info. 336 * 337 * Returns a pointer to a newly created struct logininfo. If memory 338 * allocation fails, the program halts. 339 */ 340struct 341logininfo *login_alloc_entry(pid_t pid, const char *username, 342 const char *hostname, const char *line) 343{ 344 struct logininfo *newli; 345 346 newli = xmalloc(sizeof(*newli)); 347 login_init_entry(newli, pid, username, hostname, line); 348 return (newli); 349} 350 351 352/* login_free_entry(struct logininfo *) - free struct memory */ 353void 354login_free_entry(struct logininfo *li) 355{ 356 free(li); 357} 358 359 360/* login_init_entry(struct logininfo *, int, char*, char*, char*) 361 * - initialise a struct logininfo 362 * 363 * Populates a new struct logininfo, a data structure meant to carry 364 * the information required to portably record login info. 365 * 366 * Returns: 1 367 */ 368int 369login_init_entry(struct logininfo *li, pid_t pid, const char *username, 370 const char *hostname, const char *line) 371{ 372 struct passwd *pw; 373 374 memset(li, 0, sizeof(*li)); 375 376 li->pid = pid; 377 378 /* set the line information */ 379 if (line) 380 line_fullname(li->line, line, sizeof(li->line)); 381 382 if (username) { 383 strlcpy(li->username, username, sizeof(li->username)); 384 pw = getpwnam(li->username); 385 if (pw == NULL) { 386 fatal("%s: Cannot find user \"%s\"", __func__, 387 li->username); 388 } 389 li->uid = pw->pw_uid; 390 } 391 392 if (hostname) 393 strlcpy(li->hostname, hostname, sizeof(li->hostname)); 394 395 return (1); 396} 397 398/* 399 * login_set_current_time(struct logininfo *) - set the current time 400 * 401 * Set the current time in a logininfo structure. This function is 402 * meant to eliminate the need to deal with system dependencies for 403 * time handling. 404 */ 405void 406login_set_current_time(struct logininfo *li) 407{ 408 struct timeval tv; 409 410 gettimeofday(&tv, NULL); 411 412 li->tv_sec = tv.tv_sec; 413 li->tv_usec = tv.tv_usec; 414} 415 416/* copy a sockaddr_* into our logininfo */ 417void 418login_set_addr(struct logininfo *li, const struct sockaddr *sa, 419 const unsigned int sa_size) 420{ 421 unsigned int bufsize = sa_size; 422 423 /* make sure we don't overrun our union */ 424 if (sizeof(li->hostaddr) < sa_size) 425 bufsize = sizeof(li->hostaddr); 426 427 memcpy(&li->hostaddr.sa, sa, bufsize); 428} 429 430 431/** 432 ** login_write: Call low-level recording functions based on autoconf 433 ** results 434 **/ 435int 436login_write(struct logininfo *li) 437{ 438#ifndef HAVE_CYGWIN 439 if (geteuid() != 0) { 440 logit("Attempt to write login records by non-root user (aborting)"); 441 return (1); 442 } 443#endif 444 445 /* set the timestamp */ 446 login_set_current_time(li); 447#ifdef USE_LOGIN 448 syslogin_write_entry(li); 449#endif 450#ifdef USE_LASTLOG 451 if (li->type == LTYPE_LOGIN) 452 lastlog_write_entry(li); 453#endif 454#ifdef USE_UTMP 455 utmp_write_entry(li); 456#endif 457#ifdef USE_WTMP 458 wtmp_write_entry(li); 459#endif 460#ifdef USE_UTMPX 461 utmpx_write_entry(li); 462#endif 463#ifdef USE_WTMPX 464 wtmpx_write_entry(li); 465#endif 466#ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN 467 if (li->type == LTYPE_LOGIN && 468 !sys_auth_record_login(li->username,li->hostname,li->line, 469 &loginmsg)) 470 logit("Writing login record failed for %s", li->username); 471#endif 472#ifdef SSH_AUDIT_EVENTS 473 if (li->type == LTYPE_LOGIN) 474 audit_session_open(li); 475 else if (li->type == LTYPE_LOGOUT) 476 audit_session_close(li); 477#endif 478 return (0); 479} 480 481#ifdef LOGIN_NEEDS_UTMPX 482int 483login_utmp_only(struct logininfo *li) 484{ 485 li->type = LTYPE_LOGIN; 486 login_set_current_time(li); 487# ifdef USE_UTMP 488 utmp_write_entry(li); 489# endif 490# ifdef USE_WTMP 491 wtmp_write_entry(li); 492# endif 493# ifdef USE_UTMPX 494 utmpx_write_entry(li); 495# endif 496# ifdef USE_WTMPX 497 wtmpx_write_entry(li); 498# endif 499 return (0); 500} 501#endif 502 503/** 504 ** getlast_entry: Call low-level functions to retrieve the last login 505 ** time. 506 **/ 507 508/* take the uid in li and return the last login time */ 509int 510getlast_entry(struct logininfo *li) 511{ 512#ifdef USE_LASTLOG 513 return(lastlog_get_entry(li)); 514#else /* !USE_LASTLOG */ 515#if defined(USE_UTMPX) && defined(HAVE_SETUTXDB) && \ 516 defined(UTXDB_LASTLOGIN) && defined(HAVE_GETUTXUSER) 517 return (utmpx_get_entry(li)); 518#endif 519 520#if defined(DISABLE_LASTLOG) 521 /* On some systems we shouldn't even try to obtain last login 522 * time, e.g. AIX */ 523 return (0); 524# elif defined(USE_WTMP) && \ 525 (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) 526 /* retrieve last login time from utmp */ 527 return (wtmp_get_entry(li)); 528# elif defined(USE_WTMPX) && \ 529 (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) 530 /* If wtmp isn't available, try wtmpx */ 531 return (wtmpx_get_entry(li)); 532# else 533 /* Give up: No means of retrieving last login time */ 534 return (0); 535# endif /* DISABLE_LASTLOG */ 536#endif /* USE_LASTLOG */ 537} 538 539 540 541/* 542 * 'line' string utility functions 543 * 544 * These functions process the 'line' string into one of three forms: 545 * 546 * 1. The full filename (including '/dev') 547 * 2. The stripped name (excluding '/dev') 548 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 549 * /dev/pts/1 -> ts/1 ) 550 * 551 * Form 3 is used on some systems to identify a .tmp.? entry when 552 * attempting to remove it. Typically both addition and removal is 553 * performed by one application - say, sshd - so as long as the choice 554 * uniquely identifies a terminal it's ok. 555 */ 556 557 558/* 559 * line_fullname(): add the leading '/dev/' if it doesn't exist make 560 * sure dst has enough space, if not just copy src (ugh) 561 */ 562char * 563line_fullname(char *dst, const char *src, u_int dstsize) 564{ 565 memset(dst, '\0', dstsize); 566 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) 567 strlcpy(dst, src, dstsize); 568 else { 569 strlcpy(dst, "/dev/", dstsize); 570 strlcat(dst, src, dstsize); 571 } 572 return (dst); 573} 574 575/* line_stripname(): strip the leading '/dev' if it exists, return dst */ 576char * 577line_stripname(char *dst, const char *src, int dstsize) 578{ 579 memset(dst, '\0', dstsize); 580 if (strncmp(src, "/dev/", 5) == 0) 581 strlcpy(dst, src + 5, dstsize); 582 else 583 strlcpy(dst, src, dstsize); 584 return (dst); 585} 586 587/* 588 * line_abbrevname(): Return the abbreviated (usually four-character) 589 * form of the line (Just use the last <dstsize> characters of the 590 * full name.) 591 * 592 * NOTE: use strncpy because we do NOT necessarily want zero 593 * termination 594 */ 595char * 596line_abbrevname(char *dst, const char *src, int dstsize) 597{ 598 size_t len; 599 600 memset(dst, '\0', dstsize); 601 602 /* Always skip prefix if present */ 603 if (strncmp(src, "/dev/", 5) == 0) 604 src += 5; 605 606#ifdef WITH_ABBREV_NO_TTY 607 if (strncmp(src, "tty", 3) == 0) 608 src += 3; 609#endif 610 611 len = strlen(src); 612 613 if (len > 0) { 614 if (((int)len - dstsize) > 0) 615 src += ((int)len - dstsize); 616 617 /* note: _don't_ change this to strlcpy */ 618 strncpy(dst, src, (size_t)dstsize); 619 } 620 621 return (dst); 622} 623 624/** 625 ** utmp utility functions 626 ** 627 ** These functions manipulate struct utmp, taking system differences 628 ** into account. 629 **/ 630 631#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) 632 633/* build the utmp structure */ 634void 635set_utmp_time(struct logininfo *li, struct utmp *ut) 636{ 637# if defined(HAVE_TV_IN_UTMP) 638 ut->ut_tv.tv_sec = li->tv_sec; 639 ut->ut_tv.tv_usec = li->tv_usec; 640# elif defined(HAVE_TIME_IN_UTMP) 641 ut->ut_time = li->tv_sec; 642# endif 643} 644 645void 646construct_utmp(struct logininfo *li, 647 struct utmp *ut) 648{ 649# ifdef HAVE_ADDR_V6_IN_UTMP 650 struct sockaddr_in6 *sa6; 651# endif 652 653 memset(ut, '\0', sizeof(*ut)); 654 655 /* First fill out fields used for both logins and logouts */ 656 657# ifdef HAVE_ID_IN_UTMP 658 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); 659# endif 660 661# ifdef HAVE_TYPE_IN_UTMP 662 /* This is done here to keep utmp constants out of struct logininfo */ 663 switch (li->type) { 664 case LTYPE_LOGIN: 665 ut->ut_type = USER_PROCESS; 666#ifdef _UNICOS 667 cray_set_tmpdir(ut); 668#endif 669 break; 670 case LTYPE_LOGOUT: 671 ut->ut_type = DEAD_PROCESS; 672#ifdef _UNICOS 673 cray_retain_utmp(ut, li->pid); 674#endif 675 break; 676 } 677# endif 678 set_utmp_time(li, ut); 679 680 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); 681 682# ifdef HAVE_PID_IN_UTMP 683 ut->ut_pid = li->pid; 684# endif 685 686 /* If we're logging out, leave all other fields blank */ 687 if (li->type == LTYPE_LOGOUT) 688 return; 689 690 /* 691 * These fields are only used when logging in, and are blank 692 * for logouts. 693 */ 694 695 /* Use strncpy because we don't necessarily want null termination */ 696 strncpy(ut->ut_name, li->username, 697 MIN_SIZEOF(ut->ut_name, li->username)); 698# ifdef HAVE_HOST_IN_UTMP 699 strncpy(ut->ut_host, li->hostname, 700 MIN_SIZEOF(ut->ut_host, li->hostname)); 701# endif 702# ifdef HAVE_ADDR_IN_UTMP 703 /* this is just a 32-bit IP address */ 704 if (li->hostaddr.sa.sa_family == AF_INET) 705 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; 706# endif 707# ifdef HAVE_ADDR_V6_IN_UTMP 708 /* this is just a 128-bit IPv6 address */ 709 if (li->hostaddr.sa.sa_family == AF_INET6) { 710 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); 711 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); 712 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { 713 ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; 714 ut->ut_addr_v6[1] = 0; 715 ut->ut_addr_v6[2] = 0; 716 ut->ut_addr_v6[3] = 0; 717 } 718 } 719# endif 720} 721#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ 722 723/** 724 ** utmpx utility functions 725 ** 726 ** These functions manipulate struct utmpx, accounting for system 727 ** variations. 728 **/ 729 730#if defined(USE_UTMPX) || defined (USE_WTMPX) 731/* build the utmpx structure */ 732void 733set_utmpx_time(struct logininfo *li, struct utmpx *utx) 734{ 735# if defined(HAVE_TV_IN_UTMPX) 736 utx->ut_tv.tv_sec = li->tv_sec; 737 utx->ut_tv.tv_usec = li->tv_usec; 738# elif defined(HAVE_TIME_IN_UTMPX) 739 utx->ut_time = li->tv_sec; 740# endif 741} 742 743void 744construct_utmpx(struct logininfo *li, struct utmpx *utx) 745{ 746# ifdef HAVE_ADDR_V6_IN_UTMP 747 struct sockaddr_in6 *sa6; 748# endif 749 memset(utx, '\0', sizeof(*utx)); 750 751# ifdef HAVE_ID_IN_UTMPX 752 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); 753# endif 754 755 /* this is done here to keep utmp constants out of loginrec.h */ 756 switch (li->type) { 757 case LTYPE_LOGIN: 758 utx->ut_type = USER_PROCESS; 759 break; 760 case LTYPE_LOGOUT: 761 utx->ut_type = DEAD_PROCESS; 762 break; 763 } 764 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); 765 set_utmpx_time(li, utx); 766 utx->ut_pid = li->pid; 767 768 /* strncpy(): Don't necessarily want null termination */ 769 strncpy(utx->ut_user, li->username, 770 MIN_SIZEOF(utx->ut_user, li->username)); 771 772 if (li->type == LTYPE_LOGOUT) 773 return; 774 775 /* 776 * These fields are only used when logging in, and are blank 777 * for logouts. 778 */ 779 780# ifdef HAVE_HOST_IN_UTMPX 781 strncpy(utx->ut_host, li->hostname, 782 MIN_SIZEOF(utx->ut_host, li->hostname)); 783# endif 784# ifdef HAVE_ADDR_IN_UTMPX 785 /* this is just a 32-bit IP address */ 786 if (li->hostaddr.sa.sa_family == AF_INET) 787 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; 788# endif 789# ifdef HAVE_ADDR_V6_IN_UTMP 790 /* this is just a 128-bit IPv6 address */ 791 if (li->hostaddr.sa.sa_family == AF_INET6) { 792 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); 793 memcpy(utx->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); 794 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { 795 utx->ut_addr_v6[0] = utx->ut_addr_v6[3]; 796 utx->ut_addr_v6[1] = 0; 797 utx->ut_addr_v6[2] = 0; 798 utx->ut_addr_v6[3] = 0; 799 } 800 } 801# endif 802# ifdef HAVE_SYSLEN_IN_UTMPX 803 /* ut_syslen is the length of the utx_host string */ 804 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); 805# endif 806} 807#endif /* USE_UTMPX || USE_WTMPX */ 808 809/** 810 ** Low-level utmp functions 811 **/ 812 813/* FIXME: (ATL) utmp_write_direct needs testing */ 814#ifdef USE_UTMP 815 816/* if we can, use pututline() etc. */ 817# if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ 818 defined(HAVE_PUTUTLINE) 819# define UTMP_USE_LIBRARY 820# endif 821 822 823/* write a utmp entry with the system's help (pututline() and pals) */ 824# ifdef UTMP_USE_LIBRARY 825static int 826utmp_write_library(struct logininfo *li, struct utmp *ut) 827{ 828 setutent(); 829 pututline(ut); 830# ifdef HAVE_ENDUTENT 831 endutent(); 832# endif 833 return (1); 834} 835# else /* UTMP_USE_LIBRARY */ 836 837/* 838 * Write a utmp entry direct to the file 839 * This is a slightly modification of code in OpenBSD's login.c 840 */ 841static int 842utmp_write_direct(struct logininfo *li, struct utmp *ut) 843{ 844 struct utmp old_ut; 845 register int fd; 846 int tty; 847 848 /* FIXME: (ATL) ttyslot() needs local implementation */ 849 850#if defined(HAVE_GETTTYENT) 851 struct ttyent *ty; 852 853 tty=0; 854 setttyent(); 855 while (NULL != (ty = getttyent())) { 856 tty++; 857 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) 858 break; 859 } 860 endttyent(); 861 862 if (NULL == ty) { 863 logit("%s: tty not found", __func__); 864 return (0); 865 } 866#else /* FIXME */ 867 868 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ 869 870#endif /* HAVE_GETTTYENT */ 871 872 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { 873 off_t pos, ret; 874 875 pos = (off_t)tty * sizeof(struct utmp); 876 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { 877 logit("%s: lseek: %s", __func__, strerror(errno)); 878 close(fd); 879 return (0); 880 } 881 if (ret != pos) { 882 logit("%s: Couldn't seek to tty %d slot in %s", 883 __func__, tty, UTMP_FILE); 884 close(fd); 885 return (0); 886 } 887 /* 888 * Prevent luser from zero'ing out ut_host. 889 * If the new ut_line is empty but the old one is not 890 * and ut_line and ut_name match, preserve the old ut_line. 891 */ 892 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && 893 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && 894 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && 895 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) 896 memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); 897 898 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { 899 logit("%s: lseek: %s", __func__, strerror(errno)); 900 close(fd); 901 return (0); 902 } 903 if (ret != pos) { 904 logit("%s: Couldn't seek to tty %d slot in %s", 905 __func__, tty, UTMP_FILE); 906 close(fd); 907 return (0); 908 } 909 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { 910 logit("%s: error writing %s: %s", __func__, 911 UTMP_FILE, strerror(errno)); 912 close(fd); 913 return (0); 914 } 915 916 close(fd); 917 return (1); 918 } else { 919 return (0); 920 } 921} 922# endif /* UTMP_USE_LIBRARY */ 923 924static int 925utmp_perform_login(struct logininfo *li) 926{ 927 struct utmp ut; 928 929 construct_utmp(li, &ut); 930# ifdef UTMP_USE_LIBRARY 931 if (!utmp_write_library(li, &ut)) { 932 logit("%s: utmp_write_library() failed", __func__); 933 return (0); 934 } 935# else 936 if (!utmp_write_direct(li, &ut)) { 937 logit("%s: utmp_write_direct() failed", __func__); 938 return (0); 939 } 940# endif 941 return (1); 942} 943 944 945static int 946utmp_perform_logout(struct logininfo *li) 947{ 948 struct utmp ut; 949 950 construct_utmp(li, &ut); 951# ifdef UTMP_USE_LIBRARY 952 if (!utmp_write_library(li, &ut)) { 953 logit("%s: utmp_write_library() failed", __func__); 954 return (0); 955 } 956# else 957 if (!utmp_write_direct(li, &ut)) { 958 logit("%s: utmp_write_direct() failed", __func__); 959 return (0); 960 } 961# endif 962 return (1); 963} 964 965 966int 967utmp_write_entry(struct logininfo *li) 968{ 969 switch(li->type) { 970 case LTYPE_LOGIN: 971 return (utmp_perform_login(li)); 972 973 case LTYPE_LOGOUT: 974 return (utmp_perform_logout(li)); 975 976 default: 977 logit("%s: invalid type field", __func__); 978 return (0); 979 } 980} 981#endif /* USE_UTMP */ 982 983 984/** 985 ** Low-level utmpx functions 986 **/ 987 988/* not much point if we don't want utmpx entries */ 989#ifdef USE_UTMPX 990 991/* if we have the wherewithall, use pututxline etc. */ 992# if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ 993 defined(HAVE_PUTUTXLINE) 994# define UTMPX_USE_LIBRARY 995# endif 996 997 998/* write a utmpx entry with the system's help (pututxline() and pals) */ 999# ifdef UTMPX_USE_LIBRARY 1000static int 1001utmpx_write_library(struct logininfo *li, struct utmpx *utx) 1002{ 1003 setutxent(); 1004 pututxline(utx); 1005 1006# ifdef HAVE_ENDUTXENT 1007 endutxent(); 1008# endif 1009 return (1); 1010} 1011 1012# else /* UTMPX_USE_LIBRARY */ 1013 1014/* write a utmp entry direct to the file */ 1015static int 1016utmpx_write_direct(struct logininfo *li, struct utmpx *utx) 1017{ 1018 logit("%s: not implemented!", __func__); 1019 return (0); 1020} 1021# endif /* UTMPX_USE_LIBRARY */ 1022 1023static int 1024utmpx_perform_login(struct logininfo *li) 1025{ 1026 struct utmpx utx; 1027 1028 construct_utmpx(li, &utx); 1029# ifdef UTMPX_USE_LIBRARY 1030 if (!utmpx_write_library(li, &utx)) { 1031 logit("%s: utmp_write_library() failed", __func__); 1032 return (0); 1033 } 1034# else 1035 if (!utmpx_write_direct(li, &ut)) { 1036 logit("%s: utmp_write_direct() failed", __func__); 1037 return (0); 1038 } 1039# endif 1040 return (1); 1041} 1042 1043 1044static int 1045utmpx_perform_logout(struct logininfo *li) 1046{ 1047 struct utmpx utx; 1048 1049 construct_utmpx(li, &utx); 1050# ifdef HAVE_ID_IN_UTMPX 1051 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); 1052# endif 1053# ifdef HAVE_TYPE_IN_UTMPX 1054 utx.ut_type = DEAD_PROCESS; 1055# endif 1056 1057# ifdef UTMPX_USE_LIBRARY 1058 utmpx_write_library(li, &utx); 1059# else 1060 utmpx_write_direct(li, &utx); 1061# endif 1062 return (1); 1063} 1064 1065int 1066utmpx_write_entry(struct logininfo *li) 1067{ 1068 switch(li->type) { 1069 case LTYPE_LOGIN: 1070 return (utmpx_perform_login(li)); 1071 case LTYPE_LOGOUT: 1072 return (utmpx_perform_logout(li)); 1073 default: 1074 logit("%s: invalid type field", __func__); 1075 return (0); 1076 } 1077} 1078#endif /* USE_UTMPX */ 1079 1080 1081/** 1082 ** Low-level wtmp functions 1083 **/ 1084 1085#ifdef USE_WTMP 1086 1087/* 1088 * Write a wtmp entry direct to the end of the file 1089 * This is a slight modification of code in OpenBSD's logwtmp.c 1090 */ 1091static int 1092wtmp_write(struct logininfo *li, struct utmp *ut) 1093{ 1094 struct stat buf; 1095 int fd, ret = 1; 1096 1097 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { 1098 logit("%s: problem writing %s: %s", __func__, 1099 WTMP_FILE, strerror(errno)); 1100 return (0); 1101 } 1102 if (fstat(fd, &buf) == 0) 1103 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { 1104 ftruncate(fd, buf.st_size); 1105 logit("%s: problem writing %s: %s", __func__, 1106 WTMP_FILE, strerror(errno)); 1107 ret = 0; 1108 } 1109 close(fd); 1110 return (ret); 1111} 1112 1113static int 1114wtmp_perform_login(struct logininfo *li) 1115{ 1116 struct utmp ut; 1117 1118 construct_utmp(li, &ut); 1119 return (wtmp_write(li, &ut)); 1120} 1121 1122 1123static int 1124wtmp_perform_logout(struct logininfo *li) 1125{ 1126 struct utmp ut; 1127 1128 construct_utmp(li, &ut); 1129 return (wtmp_write(li, &ut)); 1130} 1131 1132 1133int 1134wtmp_write_entry(struct logininfo *li) 1135{ 1136 switch(li->type) { 1137 case LTYPE_LOGIN: 1138 return (wtmp_perform_login(li)); 1139 case LTYPE_LOGOUT: 1140 return (wtmp_perform_logout(li)); 1141 default: 1142 logit("%s: invalid type field", __func__); 1143 return (0); 1144 } 1145} 1146 1147 1148/* 1149 * Notes on fetching login data from wtmp/wtmpx 1150 * 1151 * Logouts are usually recorded with (amongst other things) a blank 1152 * username on a given tty line. However, some systems (HP-UX is one) 1153 * leave all fields set, but change the ut_type field to DEAD_PROCESS. 1154 * 1155 * Since we're only looking for logins here, we know that the username 1156 * must be set correctly. On systems that leave it in, we check for 1157 * ut_type==USER_PROCESS (indicating a login.) 1158 * 1159 * Portability: Some systems may set something other than USER_PROCESS 1160 * to indicate a login process. I don't know of any as I write. Also, 1161 * it's possible that some systems may both leave the username in 1162 * place and not have ut_type. 1163 */ 1164 1165/* return true if this wtmp entry indicates a login */ 1166static int 1167wtmp_islogin(struct logininfo *li, struct utmp *ut) 1168{ 1169 if (strncmp(li->username, ut->ut_name, 1170 MIN_SIZEOF(li->username, ut->ut_name)) == 0) { 1171# ifdef HAVE_TYPE_IN_UTMP 1172 if (ut->ut_type & USER_PROCESS) 1173 return (1); 1174# else 1175 return (1); 1176# endif 1177 } 1178 return (0); 1179} 1180 1181int 1182wtmp_get_entry(struct logininfo *li) 1183{ 1184 struct stat st; 1185 struct utmp ut; 1186 int fd, found = 0; 1187 1188 /* Clear the time entries in our logininfo */ 1189 li->tv_sec = li->tv_usec = 0; 1190 1191 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { 1192 logit("%s: problem opening %s: %s", __func__, 1193 WTMP_FILE, strerror(errno)); 1194 return (0); 1195 } 1196 if (fstat(fd, &st) != 0) { 1197 logit("%s: couldn't stat %s: %s", __func__, 1198 WTMP_FILE, strerror(errno)); 1199 close(fd); 1200 return (0); 1201 } 1202 1203 /* Seek to the start of the last struct utmp */ 1204 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) { 1205 /* Looks like we've got a fresh wtmp file */ 1206 close(fd); 1207 return (0); 1208 } 1209 1210 while (!found) { 1211 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { 1212 logit("%s: read of %s failed: %s", __func__, 1213 WTMP_FILE, strerror(errno)); 1214 close (fd); 1215 return (0); 1216 } 1217 if (wtmp_islogin(li, &ut) ) { 1218 found = 1; 1219 /* 1220 * We've already checked for a time in struct 1221 * utmp, in login_getlast() 1222 */ 1223# ifdef HAVE_TIME_IN_UTMP 1224 li->tv_sec = ut.ut_time; 1225# else 1226# if HAVE_TV_IN_UTMP 1227 li->tv_sec = ut.ut_tv.tv_sec; 1228# endif 1229# endif 1230 line_fullname(li->line, ut.ut_line, 1231 MIN_SIZEOF(li->line, ut.ut_line)); 1232# ifdef HAVE_HOST_IN_UTMP 1233 strlcpy(li->hostname, ut.ut_host, 1234 MIN_SIZEOF(li->hostname, ut.ut_host)); 1235# endif 1236 continue; 1237 } 1238 /* Seek back 2 x struct utmp */ 1239 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) { 1240 /* We've found the start of the file, so quit */ 1241 close(fd); 1242 return (0); 1243 } 1244 } 1245 1246 /* We found an entry. Tidy up and return */ 1247 close(fd); 1248 return (1); 1249} 1250# endif /* USE_WTMP */ 1251 1252 1253/** 1254 ** Low-level wtmpx functions 1255 **/ 1256 1257#ifdef USE_WTMPX 1258/* 1259 * Write a wtmpx entry direct to the end of the file 1260 * This is a slight modification of code in OpenBSD's logwtmp.c 1261 */ 1262static int 1263wtmpx_write(struct logininfo *li, struct utmpx *utx) 1264{ 1265#ifndef HAVE_UPDWTMPX 1266 struct stat buf; 1267 int fd, ret = 1; 1268 1269 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { 1270 logit("%s: problem opening %s: %s", __func__, 1271 WTMPX_FILE, strerror(errno)); 1272 return (0); 1273 } 1274 1275 if (fstat(fd, &buf) == 0) 1276 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) { 1277 ftruncate(fd, buf.st_size); 1278 logit("%s: problem writing %s: %s", __func__, 1279 WTMPX_FILE, strerror(errno)); 1280 ret = 0; 1281 } 1282 close(fd); 1283 1284 return (ret); 1285#else 1286 updwtmpx(WTMPX_FILE, utx); 1287 return (1); 1288#endif 1289} 1290 1291 1292static int 1293wtmpx_perform_login(struct logininfo *li) 1294{ 1295 struct utmpx utx; 1296 1297 construct_utmpx(li, &utx); 1298 return (wtmpx_write(li, &utx)); 1299} 1300 1301 1302static int 1303wtmpx_perform_logout(struct logininfo *li) 1304{ 1305 struct utmpx utx; 1306 1307 construct_utmpx(li, &utx); 1308 return (wtmpx_write(li, &utx)); 1309} 1310 1311 1312int 1313wtmpx_write_entry(struct logininfo *li) 1314{ 1315 switch(li->type) { 1316 case LTYPE_LOGIN: 1317 return (wtmpx_perform_login(li)); 1318 case LTYPE_LOGOUT: 1319 return (wtmpx_perform_logout(li)); 1320 default: 1321 logit("%s: invalid type field", __func__); 1322 return (0); 1323 } 1324} 1325 1326/* Please see the notes above wtmp_islogin() for information about the 1327 next two functions */ 1328 1329/* Return true if this wtmpx entry indicates a login */ 1330static int 1331wtmpx_islogin(struct logininfo *li, struct utmpx *utx) 1332{ 1333 if (strncmp(li->username, utx->ut_user, 1334 MIN_SIZEOF(li->username, utx->ut_user)) == 0 ) { 1335# ifdef HAVE_TYPE_IN_UTMPX 1336 if (utx->ut_type == USER_PROCESS) 1337 return (1); 1338# else 1339 return (1); 1340# endif 1341 } 1342 return (0); 1343} 1344 1345 1346int 1347wtmpx_get_entry(struct logininfo *li) 1348{ 1349 struct stat st; 1350 struct utmpx utx; 1351 int fd, found=0; 1352 1353 /* Clear the time entries */ 1354 li->tv_sec = li->tv_usec = 0; 1355 1356 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { 1357 logit("%s: problem opening %s: %s", __func__, 1358 WTMPX_FILE, strerror(errno)); 1359 return (0); 1360 } 1361 if (fstat(fd, &st) != 0) { 1362 logit("%s: couldn't stat %s: %s", __func__, 1363 WTMPX_FILE, strerror(errno)); 1364 close(fd); 1365 return (0); 1366 } 1367 1368 /* Seek to the start of the last struct utmpx */ 1369 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) { 1370 /* probably a newly rotated wtmpx file */ 1371 close(fd); 1372 return (0); 1373 } 1374 1375 while (!found) { 1376 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { 1377 logit("%s: read of %s failed: %s", __func__, 1378 WTMPX_FILE, strerror(errno)); 1379 close (fd); 1380 return (0); 1381 } 1382 /* 1383 * Logouts are recorded as a blank username on a particular 1384 * line. So, we just need to find the username in struct utmpx 1385 */ 1386 if (wtmpx_islogin(li, &utx)) { 1387 found = 1; 1388# if defined(HAVE_TV_IN_UTMPX) 1389 li->tv_sec = utx.ut_tv.tv_sec; 1390# elif defined(HAVE_TIME_IN_UTMPX) 1391 li->tv_sec = utx.ut_time; 1392# endif 1393 line_fullname(li->line, utx.ut_line, sizeof(li->line)); 1394# if defined(HAVE_HOST_IN_UTMPX) 1395 strlcpy(li->hostname, utx.ut_host, 1396 MIN_SIZEOF(li->hostname, utx.ut_host)); 1397# endif 1398 continue; 1399 } 1400 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) { 1401 close(fd); 1402 return (0); 1403 } 1404 } 1405 1406 close(fd); 1407 return (1); 1408} 1409#endif /* USE_WTMPX */ 1410 1411/** 1412 ** Low-level libutil login() functions 1413 **/ 1414 1415#ifdef USE_LOGIN 1416static int 1417syslogin_perform_login(struct logininfo *li) 1418{ 1419 struct utmp *ut; 1420 1421 ut = xmalloc(sizeof(*ut)); 1422 construct_utmp(li, ut); 1423 login(ut); 1424 free(ut); 1425 1426 return (1); 1427} 1428 1429static int 1430syslogin_perform_logout(struct logininfo *li) 1431{ 1432# ifdef HAVE_LOGOUT 1433 char line[UT_LINESIZE]; 1434 1435 (void)line_stripname(line, li->line, sizeof(line)); 1436 1437 if (!logout(line)) 1438 logit("%s: logout() returned an error", __func__); 1439# ifdef HAVE_LOGWTMP 1440 else 1441 logwtmp(line, "", ""); 1442# endif 1443 /* FIXME: (ATL - if the need arises) What to do if we have 1444 * login, but no logout? what if logout but no logwtmp? All 1445 * routines are in libutil so they should all be there, 1446 * but... */ 1447# endif 1448 return (1); 1449} 1450 1451int 1452syslogin_write_entry(struct logininfo *li) 1453{ 1454 switch (li->type) { 1455 case LTYPE_LOGIN: 1456 return (syslogin_perform_login(li)); 1457 case LTYPE_LOGOUT: 1458 return (syslogin_perform_logout(li)); 1459 default: 1460 logit("%s: Invalid type field", __func__); 1461 return (0); 1462 } 1463} 1464#endif /* USE_LOGIN */ 1465 1466/* end of file log-syslogin.c */ 1467 1468/** 1469 ** Low-level lastlog functions 1470 **/ 1471 1472#ifdef USE_LASTLOG 1473 1474#if !defined(LASTLOG_WRITE_PUTUTXLINE) || !defined(HAVE_GETLASTLOGXBYNAME) 1475/* open the file (using filemode) and seek to the login entry */ 1476static int 1477lastlog_openseek(struct logininfo *li, int *fd, int filemode) 1478{ 1479 off_t offset; 1480 char lastlog_file[1024]; 1481 struct stat st; 1482 1483 if (stat(LASTLOG_FILE, &st) != 0) { 1484 logit("%s: Couldn't stat %s: %s", __func__, 1485 LASTLOG_FILE, strerror(errno)); 1486 return (0); 1487 } 1488 if (S_ISDIR(st.st_mode)) { 1489 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", 1490 LASTLOG_FILE, li->username); 1491 } else if (S_ISREG(st.st_mode)) { 1492 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); 1493 } else { 1494 logit("%s: %.100s is not a file or directory!", __func__, 1495 LASTLOG_FILE); 1496 return (0); 1497 } 1498 1499 *fd = open(lastlog_file, filemode, 0600); 1500 if (*fd < 0) { 1501 debug("%s: Couldn't open %s: %s", __func__, 1502 lastlog_file, strerror(errno)); 1503 return (0); 1504 } 1505 1506 if (S_ISREG(st.st_mode)) { 1507 /* find this uid's offset in the lastlog file */ 1508 offset = (off_t) ((u_long)li->uid * sizeof(struct lastlog)); 1509 1510 if (lseek(*fd, offset, SEEK_SET) != offset) { 1511 logit("%s: %s->lseek(): %s", __func__, 1512 lastlog_file, strerror(errno)); 1513 close(*fd); 1514 return (0); 1515 } 1516 } 1517 1518 return (1); 1519} 1520#endif /* !LASTLOG_WRITE_PUTUTXLINE || !HAVE_GETLASTLOGXBYNAME */ 1521 1522#ifdef LASTLOG_WRITE_PUTUTXLINE 1523int 1524lastlog_write_entry(struct logininfo *li) 1525{ 1526 switch(li->type) { 1527 case LTYPE_LOGIN: 1528 return 1; /* lastlog written by pututxline */ 1529 default: 1530 logit("lastlog_write_entry: Invalid type field"); 1531 return 0; 1532 } 1533} 1534#else /* LASTLOG_WRITE_PUTUTXLINE */ 1535int 1536lastlog_write_entry(struct logininfo *li) 1537{ 1538 struct lastlog last; 1539 int fd; 1540 1541 switch(li->type) { 1542 case LTYPE_LOGIN: 1543 /* create our struct lastlog */ 1544 memset(&last, '\0', sizeof(last)); 1545 line_stripname(last.ll_line, li->line, sizeof(last.ll_line)); 1546 strlcpy(last.ll_host, li->hostname, 1547 MIN_SIZEOF(last.ll_host, li->hostname)); 1548 last.ll_time = li->tv_sec; 1549 1550 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) 1551 return (0); 1552 1553 /* write the entry */ 1554 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) { 1555 close(fd); 1556 logit("%s: Error writing to %s: %s", __func__, 1557 LASTLOG_FILE, strerror(errno)); 1558 return (0); 1559 } 1560 1561 close(fd); 1562 return (1); 1563 default: 1564 logit("%s: Invalid type field", __func__); 1565 return (0); 1566 } 1567} 1568#endif /* LASTLOG_WRITE_PUTUTXLINE */ 1569 1570#ifdef HAVE_GETLASTLOGXBYNAME 1571int 1572lastlog_get_entry(struct logininfo *li) 1573{ 1574 struct lastlogx l, *ll; 1575 1576 if ((ll = getlastlogxbyname(li->username, &l)) == NULL) { 1577 memset(&l, '\0', sizeof(l)); 1578 ll = &l; 1579 } 1580 line_fullname(li->line, ll->ll_line, sizeof(li->line)); 1581 strlcpy(li->hostname, ll->ll_host, 1582 MIN_SIZEOF(li->hostname, ll->ll_host)); 1583 li->tv_sec = ll->ll_tv.tv_sec; 1584 li->tv_usec = ll->ll_tv.tv_usec; 1585 return (1); 1586} 1587#else /* HAVE_GETLASTLOGXBYNAME */ 1588int 1589lastlog_get_entry(struct logininfo *li) 1590{ 1591 struct lastlog last; 1592 int fd, ret; 1593 1594 if (!lastlog_openseek(li, &fd, O_RDONLY)) 1595 return (0); 1596 1597 ret = atomicio(read, fd, &last, sizeof(last)); 1598 close(fd); 1599 1600 switch (ret) { 1601 case 0: 1602 memset(&last, '\0', sizeof(last)); 1603 /* FALLTHRU */ 1604 case sizeof(last): 1605 line_fullname(li->line, last.ll_line, sizeof(li->line)); 1606 strlcpy(li->hostname, last.ll_host, 1607 MIN_SIZEOF(li->hostname, last.ll_host)); 1608 li->tv_sec = last.ll_time; 1609 return (1); 1610 case -1: 1611 error("%s: Error reading from %s: %s", __func__, 1612 LASTLOG_FILE, strerror(errno)); 1613 return (0); 1614 default: 1615 error("%s: Error reading from %s: Expecting %d, got %d", 1616 __func__, LASTLOG_FILE, (int)sizeof(last), ret); 1617 return (0); 1618 } 1619 1620 /* NOTREACHED */ 1621 return (0); 1622} 1623#endif /* HAVE_GETLASTLOGXBYNAME */ 1624#endif /* USE_LASTLOG */ 1625 1626#if defined(USE_UTMPX) && defined(HAVE_SETUTXDB) && \ 1627 defined(UTXDB_LASTLOGIN) && defined(HAVE_GETUTXUSER) 1628int 1629utmpx_get_entry(struct logininfo *li) 1630{ 1631 struct utmpx *utx; 1632 1633 if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) 1634 return (0); 1635 utx = getutxuser(li->username); 1636 if (utx == NULL) { 1637 endutxent(); 1638 return (0); 1639 } 1640 1641 line_fullname(li->line, utx->ut_line, 1642 MIN_SIZEOF(li->line, utx->ut_line)); 1643 strlcpy(li->hostname, utx->ut_host, 1644 MIN_SIZEOF(li->hostname, utx->ut_host)); 1645 li->tv_sec = utx->ut_tv.tv_sec; 1646 li->tv_usec = utx->ut_tv.tv_usec; 1647 endutxent(); 1648 return (1); 1649} 1650#endif /* USE_UTMPX && HAVE_SETUTXDB && UTXDB_LASTLOGIN && HAVE_GETUTXUSER */ 1651 1652#ifdef USE_BTMP 1653 /* 1654 * Logs failed login attempts in _PATH_BTMP if that exists. 1655 * The most common login failure is to give password instead of username. 1656 * So the _PATH_BTMP file checked for the correct permission, so that 1657 * only root can read it. 1658 */ 1659 1660void 1661record_failed_login(const char *username, const char *hostname, 1662 const char *ttyn) 1663{ 1664 int fd; 1665 struct utmp ut; 1666 struct sockaddr_storage from; 1667 socklen_t fromlen = sizeof(from); 1668 struct sockaddr_in *a4; 1669 struct sockaddr_in6 *a6; 1670 time_t t; 1671 struct stat fst; 1672 1673 if (geteuid() != 0) 1674 return; 1675 if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) { 1676 debug("Unable to open the btmp file %s: %s", _PATH_BTMP, 1677 strerror(errno)); 1678 return; 1679 } 1680 if (fstat(fd, &fst) < 0) { 1681 logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP, 1682 strerror(errno)); 1683 goto out; 1684 } 1685 if((fst.st_mode & (S_IXGRP | S_IRWXO)) || (fst.st_uid != 0)){ 1686 logit("Excess permission or bad ownership on file %s", 1687 _PATH_BTMP); 1688 goto out; 1689 } 1690 1691 memset(&ut, 0, sizeof(ut)); 1692 /* strncpy because we don't necessarily want nul termination */ 1693 strncpy(ut.ut_user, username, sizeof(ut.ut_user)); 1694 strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line)); 1695 1696 time(&t); 1697 ut.ut_time = t; /* ut_time is not always a time_t */ 1698 ut.ut_type = LOGIN_PROCESS; 1699 ut.ut_pid = getpid(); 1700 1701 /* strncpy because we don't necessarily want nul termination */ 1702 strncpy(ut.ut_host, hostname, sizeof(ut.ut_host)); 1703 1704 if (packet_connection_is_on_socket() && 1705 getpeername(packet_get_connection_in(), 1706 (struct sockaddr *)&from, &fromlen) == 0) { 1707 ipv64_normalise_mapped(&from, &fromlen); 1708 if (from.ss_family == AF_INET) { 1709 a4 = (struct sockaddr_in *)&from; 1710 memcpy(&ut.ut_addr, &(a4->sin_addr), 1711 MIN_SIZEOF(ut.ut_addr, a4->sin_addr)); 1712 } 1713#ifdef HAVE_ADDR_V6_IN_UTMP 1714 if (from.ss_family == AF_INET6) { 1715 a6 = (struct sockaddr_in6 *)&from; 1716 memcpy(&ut.ut_addr_v6, &(a6->sin6_addr), 1717 MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr)); 1718 } 1719#endif 1720 } 1721 1722 if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut)) 1723 error("Failed to write to %s: %s", _PATH_BTMP, 1724 strerror(errno)); 1725 1726out: 1727 close(fd); 1728} 1729#endif /* USE_BTMP */ 1730