loginrec.c revision 204917
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__RCSID("$FreeBSD: head/crypto/openssh/loginrec.c 204917 2010-03-09 19:16:43Z des $"); 150 151#include <sys/types.h> 152#include <sys/stat.h> 153#include <sys/socket.h> 154 155#include <netinet/in.h> 156 157#include <errno.h> 158#include <fcntl.h> 159#ifdef HAVE_PATHS_H 160# include <paths.h> 161#endif 162#include <pwd.h> 163#include <stdarg.h> 164#include <string.h> 165#include <time.h> 166#include <unistd.h> 167 168#include "xmalloc.h" 169#include "key.h" 170#include "hostfile.h" 171#include "ssh.h" 172#include "loginrec.h" 173#include "log.h" 174#include "atomicio.h" 175#include "packet.h" 176#include "canohost.h" 177#include "auth.h" 178#include "buffer.h" 179 180#ifdef HAVE_UTIL_H 181# include <util.h> 182#endif 183 184#ifdef HAVE_LIBUTIL_H 185# include <libutil.h> 186#endif 187 188/** 189 ** prototypes for helper functions in this file 190 **/ 191 192#if HAVE_UTMP_H 193void set_utmp_time(struct logininfo *li, struct utmp *ut); 194void construct_utmp(struct logininfo *li, struct utmp *ut); 195#endif 196 197#ifdef HAVE_UTMPX_H 198void set_utmpx_time(struct logininfo *li, struct utmpx *ut); 199void construct_utmpx(struct logininfo *li, struct utmpx *ut); 200#endif 201 202int utmp_write_entry(struct logininfo *li); 203int utmpx_write_entry(struct logininfo *li); 204int wtmp_write_entry(struct logininfo *li); 205int wtmpx_write_entry(struct logininfo *li); 206int lastlog_write_entry(struct logininfo *li); 207int syslogin_write_entry(struct logininfo *li); 208 209int getlast_entry(struct logininfo *li); 210int lastlog_get_entry(struct logininfo *li); 211int utmpx_get_entry(struct logininfo *li); 212int wtmp_get_entry(struct logininfo *li); 213int wtmpx_get_entry(struct logininfo *li); 214 215extern Buffer loginmsg; 216 217/* pick the shortest string */ 218#define MIN_SIZEOF(s1,s2) (sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2)) 219 220/** 221 ** platform-independent login functions 222 **/ 223 224/* 225 * login_login(struct logininfo *) - Record a login 226 * 227 * Call with a pointer to a struct logininfo initialised with 228 * login_init_entry() or login_alloc_entry() 229 * 230 * Returns: 231 * >0 if successful 232 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 233 */ 234int 235login_login(struct logininfo *li) 236{ 237 li->type = LTYPE_LOGIN; 238 return (login_write(li)); 239} 240 241 242/* 243 * login_logout(struct logininfo *) - Record a logout 244 * 245 * Call as with login_login() 246 * 247 * Returns: 248 * >0 if successful 249 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 250 */ 251int 252login_logout(struct logininfo *li) 253{ 254 li->type = LTYPE_LOGOUT; 255 return (login_write(li)); 256} 257 258/* 259 * login_get_lastlog_time(int) - Retrieve the last login time 260 * 261 * Retrieve the last login time for the given uid. Will try to use the 262 * system lastlog facilities if they are available, but will fall back 263 * to looking in wtmp/wtmpx if necessary 264 * 265 * Returns: 266 * 0 on failure, or if user has never logged in 267 * Time in seconds from the epoch if successful 268 * 269 * Useful preprocessor symbols: 270 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog 271 * info 272 * USE_LASTLOG: If set, indicates the presence of system lastlog 273 * facilities. If this and DISABLE_LASTLOG are not set, 274 * try to retrieve lastlog information from wtmp/wtmpx. 275 */ 276unsigned int 277login_get_lastlog_time(const int uid) 278{ 279 struct logininfo li; 280 281 if (login_get_lastlog(&li, uid)) 282 return (li.tv_sec); 283 else 284 return (0); 285} 286 287/* 288 * login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry 289 * 290 * Retrieve a logininfo structure populated (only partially) with 291 * information from the system lastlog data, or from wtmp/wtmpx if no 292 * system lastlog information exists. 293 * 294 * Note this routine must be given a pre-allocated logininfo. 295 * 296 * Returns: 297 * >0: A pointer to your struct logininfo if successful 298 * 0 on failure (will use OpenSSH's logging facilities for diagnostics) 299 */ 300struct logininfo * 301login_get_lastlog(struct logininfo *li, const int uid) 302{ 303 struct passwd *pw; 304 305 memset(li, '\0', sizeof(*li)); 306 li->uid = uid; 307 308 /* 309 * If we don't have a 'real' lastlog, we need the username to 310 * reliably search wtmp(x) for the last login (see 311 * wtmp_get_entry().) 312 */ 313 pw = getpwuid(uid); 314 if (pw == NULL) 315 fatal("%s: Cannot find account for uid %i", __func__, uid); 316 317 /* No MIN_SIZEOF here - we absolutely *must not* truncate the 318 * username (XXX - so check for trunc!) */ 319 strlcpy(li->username, pw->pw_name, sizeof(li->username)); 320 321 if (getlast_entry(li)) 322 return (li); 323 else 324 return (NULL); 325} 326 327 328/* 329 * login_alloc_entry(int, char*, char*, char*) - Allocate and initialise 330 * a logininfo structure 331 * 332 * This function creates a new struct logininfo, a data structure 333 * meant to carry the information required to portably record login info. 334 * 335 * Returns a pointer to a newly created struct logininfo. If memory 336 * allocation fails, the program halts. 337 */ 338struct 339logininfo *login_alloc_entry(int pid, const char *username, 340 const char *hostname, const char *line) 341{ 342 struct logininfo *newli; 343 344 newli = xmalloc(sizeof(*newli)); 345 login_init_entry(newli, pid, username, hostname, line); 346 return (newli); 347} 348 349 350/* login_free_entry(struct logininfo *) - free struct memory */ 351void 352login_free_entry(struct logininfo *li) 353{ 354 xfree(li); 355} 356 357 358/* login_init_entry(struct logininfo *, int, char*, char*, char*) 359 * - initialise a struct logininfo 360 * 361 * Populates a new struct logininfo, a data structure meant to carry 362 * the information required to portably record login info. 363 * 364 * Returns: 1 365 */ 366int 367login_init_entry(struct logininfo *li, int pid, const char *username, 368 const char *hostname, const char *line) 369{ 370 struct passwd *pw; 371 372 memset(li, 0, sizeof(*li)); 373 374 li->pid = pid; 375 376 /* set the line information */ 377 if (line) 378 line_fullname(li->line, line, sizeof(li->line)); 379 380 if (username) { 381 strlcpy(li->username, username, sizeof(li->username)); 382 pw = getpwnam(li->username); 383 if (pw == NULL) { 384 fatal("%s: Cannot find user \"%s\"", __func__, 385 li->username); 386 } 387 li->uid = pw->pw_uid; 388 } 389 390 if (hostname) 391 strlcpy(li->hostname, hostname, sizeof(li->hostname)); 392 393 return (1); 394} 395 396/* 397 * login_set_current_time(struct logininfo *) - set the current time 398 * 399 * Set the current time in a logininfo structure. This function is 400 * meant to eliminate the need to deal with system dependencies for 401 * time handling. 402 */ 403void 404login_set_current_time(struct logininfo *li) 405{ 406 struct timeval tv; 407 408 gettimeofday(&tv, NULL); 409 410 li->tv_sec = tv.tv_sec; 411 li->tv_usec = tv.tv_usec; 412} 413 414/* copy a sockaddr_* into our logininfo */ 415void 416login_set_addr(struct logininfo *li, const struct sockaddr *sa, 417 const unsigned int sa_size) 418{ 419 unsigned int bufsize = sa_size; 420 421 /* make sure we don't overrun our union */ 422 if (sizeof(li->hostaddr) < sa_size) 423 bufsize = sizeof(li->hostaddr); 424 425 memcpy(&li->hostaddr.sa, sa, bufsize); 426} 427 428 429/** 430 ** login_write: Call low-level recording functions based on autoconf 431 ** results 432 **/ 433int 434login_write(struct logininfo *li) 435{ 436#ifndef HAVE_CYGWIN 437 if (geteuid() != 0) { 438 logit("Attempt to write login records by non-root user (aborting)"); 439 return (1); 440 } 441#endif 442 443 /* set the timestamp */ 444 login_set_current_time(li); 445#ifdef USE_LOGIN 446 syslogin_write_entry(li); 447#endif 448#ifdef USE_LASTLOG 449 if (li->type == LTYPE_LOGIN) 450 lastlog_write_entry(li); 451#endif 452#ifdef USE_UTMP 453 utmp_write_entry(li); 454#endif 455#ifdef USE_WTMP 456 wtmp_write_entry(li); 457#endif 458#ifdef USE_UTMPX 459 utmpx_write_entry(li); 460#endif 461#ifdef USE_WTMPX 462 wtmpx_write_entry(li); 463#endif 464#ifdef CUSTOM_SYS_AUTH_RECORD_LOGIN 465 if (li->type == LTYPE_LOGIN && 466 !sys_auth_record_login(li->username,li->hostname,li->line, 467 &loginmsg)) 468 logit("Writing login record failed for %s", li->username); 469#endif 470#ifdef SSH_AUDIT_EVENTS 471 if (li->type == LTYPE_LOGIN) 472 audit_session_open(li->line); 473 else if (li->type == LTYPE_LOGOUT) 474 audit_session_close(li->line); 475#endif 476 return (0); 477} 478 479#ifdef LOGIN_NEEDS_UTMPX 480int 481login_utmp_only(struct logininfo *li) 482{ 483 li->type = LTYPE_LOGIN; 484 login_set_current_time(li); 485# ifdef USE_UTMP 486 utmp_write_entry(li); 487# endif 488# ifdef USE_WTMP 489 wtmp_write_entry(li); 490# endif 491# ifdef USE_UTMPX 492 utmpx_write_entry(li); 493# endif 494# ifdef USE_WTMPX 495 wtmpx_write_entry(li); 496# endif 497 return (0); 498} 499#endif 500 501/** 502 ** getlast_entry: Call low-level functions to retrieve the last login 503 ** time. 504 **/ 505 506/* take the uid in li and return the last login time */ 507int 508getlast_entry(struct logininfo *li) 509{ 510#ifdef USE_LASTLOG 511 return(lastlog_get_entry(li)); 512#else /* !USE_LASTLOG */ 513 514#if 1 515 return (utmpx_get_entry(li)); 516#endif 517 518#if defined(DISABLE_LASTLOG) 519 /* On some systems we shouldn't even try to obtain last login 520 * time, e.g. AIX */ 521 return (0); 522# elif defined(USE_WTMP) && \ 523 (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) 524 /* retrieve last login time from utmp */ 525 return (wtmp_get_entry(li)); 526# elif defined(USE_WTMPX) && \ 527 (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) 528 /* If wtmp isn't available, try wtmpx */ 529 return (wtmpx_get_entry(li)); 530# else 531 /* Give up: No means of retrieving last login time */ 532 return (0); 533# endif /* DISABLE_LASTLOG */ 534#endif /* USE_LASTLOG */ 535} 536 537 538 539/* 540 * 'line' string utility functions 541 * 542 * These functions process the 'line' string into one of three forms: 543 * 544 * 1. The full filename (including '/dev') 545 * 2. The stripped name (excluding '/dev') 546 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 547 * /dev/pts/1 -> ts/1 ) 548 * 549 * Form 3 is used on some systems to identify a .tmp.? entry when 550 * attempting to remove it. Typically both addition and removal is 551 * performed by one application - say, sshd - so as long as the choice 552 * uniquely identifies a terminal it's ok. 553 */ 554 555 556/* 557 * line_fullname(): add the leading '/dev/' if it doesn't exist make 558 * sure dst has enough space, if not just copy src (ugh) 559 */ 560char * 561line_fullname(char *dst, const char *src, u_int dstsize) 562{ 563 memset(dst, '\0', dstsize); 564 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) 565 strlcpy(dst, src, dstsize); 566 else { 567 strlcpy(dst, "/dev/", dstsize); 568 strlcat(dst, src, dstsize); 569 } 570 return (dst); 571} 572 573/* line_stripname(): strip the leading '/dev' if it exists, return dst */ 574char * 575line_stripname(char *dst, const char *src, int dstsize) 576{ 577 memset(dst, '\0', dstsize); 578 if (strncmp(src, "/dev/", 5) == 0) 579 strlcpy(dst, src + 5, dstsize); 580 else 581 strlcpy(dst, src, dstsize); 582 return (dst); 583} 584 585/* 586 * line_abbrevname(): Return the abbreviated (usually four-character) 587 * form of the line (Just use the last <dstsize> characters of the 588 * full name.) 589 * 590 * NOTE: use strncpy because we do NOT necessarily want zero 591 * termination 592 */ 593char * 594line_abbrevname(char *dst, const char *src, int dstsize) 595{ 596 size_t len; 597 598 memset(dst, '\0', dstsize); 599 600 /* Always skip prefix if present */ 601 if (strncmp(src, "/dev/", 5) == 0) 602 src += 5; 603 604#ifdef WITH_ABBREV_NO_TTY 605 if (strncmp(src, "tty", 3) == 0) 606 src += 3; 607#endif 608 609 len = strlen(src); 610 611 if (len > 0) { 612 if (((int)len - dstsize) > 0) 613 src += ((int)len - dstsize); 614 615 /* note: _don't_ change this to strlcpy */ 616 strncpy(dst, src, (size_t)dstsize); 617 } 618 619 return (dst); 620} 621 622/** 623 ** utmp utility functions 624 ** 625 ** These functions manipulate struct utmp, taking system differences 626 ** into account. 627 **/ 628 629#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) 630 631/* build the utmp structure */ 632void 633set_utmp_time(struct logininfo *li, struct utmp *ut) 634{ 635# if defined(HAVE_TV_IN_UTMP) 636 ut->ut_tv.tv_sec = li->tv_sec; 637 ut->ut_tv.tv_usec = li->tv_usec; 638# elif defined(HAVE_TIME_IN_UTMP) 639 ut->ut_time = li->tv_sec; 640# endif 641} 642 643void 644construct_utmp(struct logininfo *li, 645 struct utmp *ut) 646{ 647# ifdef HAVE_ADDR_V6_IN_UTMP 648 struct sockaddr_in6 *sa6; 649# endif 650 651 memset(ut, '\0', sizeof(*ut)); 652 653 /* First fill out fields used for both logins and logouts */ 654 655# ifdef HAVE_ID_IN_UTMP 656 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); 657# endif 658 659# ifdef HAVE_TYPE_IN_UTMP 660 /* This is done here to keep utmp constants out of struct logininfo */ 661 switch (li->type) { 662 case LTYPE_LOGIN: 663 ut->ut_type = USER_PROCESS; 664#ifdef _UNICOS 665 cray_set_tmpdir(ut); 666#endif 667 break; 668 case LTYPE_LOGOUT: 669 ut->ut_type = DEAD_PROCESS; 670#ifdef _UNICOS 671 cray_retain_utmp(ut, li->pid); 672#endif 673 break; 674 } 675# endif 676 set_utmp_time(li, ut); 677 678 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); 679 680# ifdef HAVE_PID_IN_UTMP 681 ut->ut_pid = li->pid; 682# endif 683 684 /* If we're logging out, leave all other fields blank */ 685 if (li->type == LTYPE_LOGOUT) 686 return; 687 688 /* 689 * These fields are only used when logging in, and are blank 690 * for logouts. 691 */ 692 693 /* Use strncpy because we don't necessarily want null termination */ 694 strncpy(ut->ut_name, li->username, 695 MIN_SIZEOF(ut->ut_name, li->username)); 696# ifdef HAVE_HOST_IN_UTMP 697 strncpy(ut->ut_host, li->hostname, 698 MIN_SIZEOF(ut->ut_host, li->hostname)); 699# endif 700# ifdef HAVE_ADDR_IN_UTMP 701 /* this is just a 32-bit IP address */ 702 if (li->hostaddr.sa.sa_family == AF_INET) 703 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; 704# endif 705# ifdef HAVE_ADDR_V6_IN_UTMP 706 /* this is just a 128-bit IPv6 address */ 707 if (li->hostaddr.sa.sa_family == AF_INET6) { 708 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); 709 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); 710 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { 711 ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; 712 ut->ut_addr_v6[1] = 0; 713 ut->ut_addr_v6[2] = 0; 714 ut->ut_addr_v6[3] = 0; 715 } 716 } 717# endif 718} 719#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */ 720 721/** 722 ** utmpx utility functions 723 ** 724 ** These functions manipulate struct utmpx, accounting for system 725 ** variations. 726 **/ 727 728#if defined(USE_UTMPX) || defined (USE_WTMPX) 729/* build the utmpx structure */ 730void 731set_utmpx_time(struct logininfo *li, struct utmpx *utx) 732{ 733# if defined(HAVE_TV_IN_UTMPX) 734 utx->ut_tv.tv_sec = li->tv_sec; 735 utx->ut_tv.tv_usec = li->tv_usec; 736# elif defined(HAVE_TIME_IN_UTMPX) 737 utx->ut_time = li->tv_sec; 738# endif 739} 740 741void 742construct_utmpx(struct logininfo *li, struct utmpx *utx) 743{ 744# ifdef HAVE_ADDR_V6_IN_UTMP 745 struct sockaddr_in6 *sa6; 746# endif 747 memset(utx, '\0', sizeof(*utx)); 748 749# ifdef HAVE_ID_IN_UTMPX 750 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); 751# endif 752 753 /* this is done here to keep utmp constants out of loginrec.h */ 754 switch (li->type) { 755 case LTYPE_LOGIN: 756 utx->ut_type = USER_PROCESS; 757 break; 758 case LTYPE_LOGOUT: 759 utx->ut_type = DEAD_PROCESS; 760 break; 761 } 762 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); 763 set_utmpx_time(li, utx); 764 utx->ut_pid = li->pid; 765 766 /* strncpy(): Don't necessarily want null termination */ 767 strncpy(utx->ut_user, li->username, 768 MIN_SIZEOF(utx->ut_user, li->username)); 769 770 if (li->type == LTYPE_LOGOUT) 771 return; 772 773 /* 774 * These fields are only used when logging in, and are blank 775 * for logouts. 776 */ 777 778# ifdef HAVE_HOST_IN_UTMPX 779 strncpy(utx->ut_host, li->hostname, 780 MIN_SIZEOF(utx->ut_host, li->hostname)); 781# endif 782# ifdef HAVE_ADDR_IN_UTMPX 783 /* this is just a 32-bit IP address */ 784 if (li->hostaddr.sa.sa_family == AF_INET) 785 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; 786# endif 787# ifdef HAVE_ADDR_V6_IN_UTMP 788 /* this is just a 128-bit IPv6 address */ 789 if (li->hostaddr.sa.sa_family == AF_INET6) { 790 sa6 = ((struct sockaddr_in6 *)&li->hostaddr.sa); 791 memcpy(ut->ut_addr_v6, sa6->sin6_addr.s6_addr, 16); 792 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) { 793 ut->ut_addr_v6[0] = ut->ut_addr_v6[3]; 794 ut->ut_addr_v6[1] = 0; 795 ut->ut_addr_v6[2] = 0; 796 ut->ut_addr_v6[3] = 0; 797 } 798 } 799# endif 800# ifdef HAVE_SYSLEN_IN_UTMPX 801 /* ut_syslen is the length of the utx_host string */ 802 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host)); 803# endif 804} 805#endif /* USE_UTMPX || USE_WTMPX */ 806 807/** 808 ** Low-level utmp functions 809 **/ 810 811/* FIXME: (ATL) utmp_write_direct needs testing */ 812#ifdef USE_UTMP 813 814/* if we can, use pututline() etc. */ 815# if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ 816 defined(HAVE_PUTUTLINE) 817# define UTMP_USE_LIBRARY 818# endif 819 820 821/* write a utmp entry with the system's help (pututline() and pals) */ 822# ifdef UTMP_USE_LIBRARY 823static int 824utmp_write_library(struct logininfo *li, struct utmp *ut) 825{ 826 setutent(); 827 pututline(ut); 828# ifdef HAVE_ENDUTENT 829 endutent(); 830# endif 831 return (1); 832} 833# else /* UTMP_USE_LIBRARY */ 834 835/* 836 * Write a utmp entry direct to the file 837 * This is a slightly modification of code in OpenBSD's login.c 838 */ 839static int 840utmp_write_direct(struct logininfo *li, struct utmp *ut) 841{ 842 struct utmp old_ut; 843 register int fd; 844 int tty; 845 846 /* FIXME: (ATL) ttyslot() needs local implementation */ 847 848#if defined(HAVE_GETTTYENT) 849 struct ttyent *ty; 850 851 tty=0; 852 setttyent(); 853 while (NULL != (ty = getttyent())) { 854 tty++; 855 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line))) 856 break; 857 } 858 endttyent(); 859 860 if (NULL == ty) { 861 logit("%s: tty not found", __func__); 862 return (0); 863 } 864#else /* FIXME */ 865 866 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ 867 868#endif /* HAVE_GETTTYENT */ 869 870 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { 871 off_t pos, ret; 872 873 pos = (off_t)tty * sizeof(struct utmp); 874 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { 875 logit("%s: lseek: %s", __func__, strerror(errno)); 876 return (0); 877 } 878 if (ret != pos) { 879 logit("%s: Couldn't seek to tty %d slot in %s", 880 __func__, tty, UTMP_FILE); 881 return (0); 882 } 883 /* 884 * Prevent luser from zero'ing out ut_host. 885 * If the new ut_line is empty but the old one is not 886 * and ut_line and ut_name match, preserve the old ut_line. 887 */ 888 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) && 889 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') && 890 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) && 891 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) 892 memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); 893 894 if ((ret = lseek(fd, pos, SEEK_SET)) == -1) { 895 logit("%s: lseek: %s", __func__, strerror(errno)); 896 return (0); 897 } 898 if (ret != pos) { 899 logit("%s: Couldn't seek to tty %d slot in %s", 900 __func__, tty, UTMP_FILE); 901 return (0); 902 } 903 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { 904 logit("%s: error writing %s: %s", __func__, 905 UTMP_FILE, strerror(errno)); 906 } 907 908 close(fd); 909 return (1); 910 } else { 911 return (0); 912 } 913} 914# endif /* UTMP_USE_LIBRARY */ 915 916static int 917utmp_perform_login(struct logininfo *li) 918{ 919 struct utmp ut; 920 921 construct_utmp(li, &ut); 922# ifdef UTMP_USE_LIBRARY 923 if (!utmp_write_library(li, &ut)) { 924 logit("%s: utmp_write_library() failed", __func__); 925 return (0); 926 } 927# else 928 if (!utmp_write_direct(li, &ut)) { 929 logit("%s: utmp_write_direct() failed", __func__); 930 return (0); 931 } 932# endif 933 return (1); 934} 935 936 937static int 938utmp_perform_logout(struct logininfo *li) 939{ 940 struct utmp ut; 941 942 construct_utmp(li, &ut); 943# ifdef UTMP_USE_LIBRARY 944 if (!utmp_write_library(li, &ut)) { 945 logit("%s: utmp_write_library() failed", __func__); 946 return (0); 947 } 948# else 949 if (!utmp_write_direct(li, &ut)) { 950 logit("%s: utmp_write_direct() failed", __func__); 951 return (0); 952 } 953# endif 954 return (1); 955} 956 957 958int 959utmp_write_entry(struct logininfo *li) 960{ 961 switch(li->type) { 962 case LTYPE_LOGIN: 963 return (utmp_perform_login(li)); 964 965 case LTYPE_LOGOUT: 966 return (utmp_perform_logout(li)); 967 968 default: 969 logit("%s: invalid type field", __func__); 970 return (0); 971 } 972} 973#endif /* USE_UTMP */ 974 975 976/** 977 ** Low-level utmpx functions 978 **/ 979 980/* not much point if we don't want utmpx entries */ 981#ifdef USE_UTMPX 982 983/* if we have the wherewithall, use pututxline etc. */ 984# if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \ 985 defined(HAVE_PUTUTXLINE) 986# define UTMPX_USE_LIBRARY 987# endif 988 989 990/* write a utmpx entry with the system's help (pututxline() and pals) */ 991# ifdef UTMPX_USE_LIBRARY 992static int 993utmpx_write_library(struct logininfo *li, struct utmpx *utx) 994{ 995 setutxent(); 996 pututxline(utx); 997 998# ifdef HAVE_ENDUTXENT 999 endutxent(); 1000# endif 1001 return (1); 1002} 1003 1004# else /* UTMPX_USE_LIBRARY */ 1005 1006/* write a utmp entry direct to the file */ 1007static int 1008utmpx_write_direct(struct logininfo *li, struct utmpx *utx) 1009{ 1010 logit("%s: not implemented!", __func__); 1011 return (0); 1012} 1013# endif /* UTMPX_USE_LIBRARY */ 1014 1015static int 1016utmpx_perform_login(struct logininfo *li) 1017{ 1018 struct utmpx utx; 1019 1020 construct_utmpx(li, &utx); 1021# ifdef UTMPX_USE_LIBRARY 1022 if (!utmpx_write_library(li, &utx)) { 1023 logit("%s: utmp_write_library() failed", __func__); 1024 return (0); 1025 } 1026# else 1027 if (!utmpx_write_direct(li, &ut)) { 1028 logit("%s: utmp_write_direct() failed", __func__); 1029 return (0); 1030 } 1031# endif 1032 return (1); 1033} 1034 1035 1036static int 1037utmpx_perform_logout(struct logininfo *li) 1038{ 1039 struct utmpx utx; 1040 1041 construct_utmpx(li, &utx); 1042# ifdef HAVE_ID_IN_UTMPX 1043 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); 1044# endif 1045# ifdef HAVE_TYPE_IN_UTMPX 1046 utx.ut_type = DEAD_PROCESS; 1047# endif 1048 1049# ifdef UTMPX_USE_LIBRARY 1050 utmpx_write_library(li, &utx); 1051# else 1052 utmpx_write_direct(li, &utx); 1053# endif 1054 return (1); 1055} 1056 1057int 1058utmpx_write_entry(struct logininfo *li) 1059{ 1060 switch(li->type) { 1061 case LTYPE_LOGIN: 1062 return (utmpx_perform_login(li)); 1063 case LTYPE_LOGOUT: 1064 return (utmpx_perform_logout(li)); 1065 default: 1066 logit("%s: invalid type field", __func__); 1067 return (0); 1068 } 1069} 1070#endif /* USE_UTMPX */ 1071 1072 1073/** 1074 ** Low-level wtmp functions 1075 **/ 1076 1077#ifdef USE_WTMP 1078 1079/* 1080 * Write a wtmp entry direct to the end of the file 1081 * This is a slight modification of code in OpenBSD's logwtmp.c 1082 */ 1083static int 1084wtmp_write(struct logininfo *li, struct utmp *ut) 1085{ 1086 struct stat buf; 1087 int fd, ret = 1; 1088 1089 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { 1090 logit("%s: problem writing %s: %s", __func__, 1091 WTMP_FILE, strerror(errno)); 1092 return (0); 1093 } 1094 if (fstat(fd, &buf) == 0) 1095 if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) { 1096 ftruncate(fd, buf.st_size); 1097 logit("%s: problem writing %s: %s", __func__, 1098 WTMP_FILE, strerror(errno)); 1099 ret = 0; 1100 } 1101 close(fd); 1102 return (ret); 1103} 1104 1105static int 1106wtmp_perform_login(struct logininfo *li) 1107{ 1108 struct utmp ut; 1109 1110 construct_utmp(li, &ut); 1111 return (wtmp_write(li, &ut)); 1112} 1113 1114 1115static int 1116wtmp_perform_logout(struct logininfo *li) 1117{ 1118 struct utmp ut; 1119 1120 construct_utmp(li, &ut); 1121 return (wtmp_write(li, &ut)); 1122} 1123 1124 1125int 1126wtmp_write_entry(struct logininfo *li) 1127{ 1128 switch(li->type) { 1129 case LTYPE_LOGIN: 1130 return (wtmp_perform_login(li)); 1131 case LTYPE_LOGOUT: 1132 return (wtmp_perform_logout(li)); 1133 default: 1134 logit("%s: invalid type field", __func__); 1135 return (0); 1136 } 1137} 1138 1139 1140/* 1141 * Notes on fetching login data from wtmp/wtmpx 1142 * 1143 * Logouts are usually recorded with (amongst other things) a blank 1144 * username on a given tty line. However, some systems (HP-UX is one) 1145 * leave all fields set, but change the ut_type field to DEAD_PROCESS. 1146 * 1147 * Since we're only looking for logins here, we know that the username 1148 * must be set correctly. On systems that leave it in, we check for 1149 * ut_type==USER_PROCESS (indicating a login.) 1150 * 1151 * Portability: Some systems may set something other than USER_PROCESS 1152 * to indicate a login process. I don't know of any as I write. Also, 1153 * it's possible that some systems may both leave the username in 1154 * place and not have ut_type. 1155 */ 1156 1157/* return true if this wtmp entry indicates a login */ 1158static int 1159wtmp_islogin(struct logininfo *li, struct utmp *ut) 1160{ 1161 if (strncmp(li->username, ut->ut_name, 1162 MIN_SIZEOF(li->username, ut->ut_name)) == 0) { 1163# ifdef HAVE_TYPE_IN_UTMP 1164 if (ut->ut_type & USER_PROCESS) 1165 return (1); 1166# else 1167 return (1); 1168# endif 1169 } 1170 return (0); 1171} 1172 1173int 1174wtmp_get_entry(struct logininfo *li) 1175{ 1176 struct stat st; 1177 struct utmp ut; 1178 int fd, found = 0; 1179 1180 /* Clear the time entries in our logininfo */ 1181 li->tv_sec = li->tv_usec = 0; 1182 1183 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { 1184 logit("%s: problem opening %s: %s", __func__, 1185 WTMP_FILE, strerror(errno)); 1186 return (0); 1187 } 1188 if (fstat(fd, &st) != 0) { 1189 logit("%s: couldn't stat %s: %s", __func__, 1190 WTMP_FILE, strerror(errno)); 1191 close(fd); 1192 return (0); 1193 } 1194 1195 /* Seek to the start of the last struct utmp */ 1196 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) { 1197 /* Looks like we've got a fresh wtmp file */ 1198 close(fd); 1199 return (0); 1200 } 1201 1202 while (!found) { 1203 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) { 1204 logit("%s: read of %s failed: %s", __func__, 1205 WTMP_FILE, strerror(errno)); 1206 close (fd); 1207 return (0); 1208 } 1209 if ( wtmp_islogin(li, &ut) ) { 1210 found = 1; 1211 /* 1212 * We've already checked for a time in struct 1213 * utmp, in login_getlast() 1214 */ 1215# ifdef HAVE_TIME_IN_UTMP 1216 li->tv_sec = ut.ut_time; 1217# else 1218# if HAVE_TV_IN_UTMP 1219 li->tv_sec = ut.ut_tv.tv_sec; 1220# endif 1221# endif 1222 line_fullname(li->line, ut.ut_line, 1223 MIN_SIZEOF(li->line, ut.ut_line)); 1224# ifdef HAVE_HOST_IN_UTMP 1225 strlcpy(li->hostname, ut.ut_host, 1226 MIN_SIZEOF(li->hostname, ut.ut_host)); 1227# endif 1228 continue; 1229 } 1230 /* Seek back 2 x struct utmp */ 1231 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) { 1232 /* We've found the start of the file, so quit */ 1233 close(fd); 1234 return (0); 1235 } 1236 } 1237 1238 /* We found an entry. Tidy up and return */ 1239 close(fd); 1240 return (1); 1241} 1242# endif /* USE_WTMP */ 1243 1244 1245/** 1246 ** Low-level wtmpx functions 1247 **/ 1248 1249#ifdef USE_WTMPX 1250/* 1251 * Write a wtmpx entry direct to the end of the file 1252 * This is a slight modification of code in OpenBSD's logwtmp.c 1253 */ 1254static int 1255wtmpx_write(struct logininfo *li, struct utmpx *utx) 1256{ 1257#ifndef HAVE_UPDWTMPX 1258 struct stat buf; 1259 int fd, ret = 1; 1260 1261 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { 1262 logit("%s: problem opening %s: %s", __func__, 1263 WTMPX_FILE, strerror(errno)); 1264 return (0); 1265 } 1266 1267 if (fstat(fd, &buf) == 0) 1268 if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) { 1269 ftruncate(fd, buf.st_size); 1270 logit("%s: problem writing %s: %s", __func__, 1271 WTMPX_FILE, strerror(errno)); 1272 ret = 0; 1273 } 1274 close(fd); 1275 1276 return (ret); 1277#else 1278 updwtmpx(WTMPX_FILE, utx); 1279 return (1); 1280#endif 1281} 1282 1283 1284static int 1285wtmpx_perform_login(struct logininfo *li) 1286{ 1287 struct utmpx utx; 1288 1289 construct_utmpx(li, &utx); 1290 return (wtmpx_write(li, &utx)); 1291} 1292 1293 1294static int 1295wtmpx_perform_logout(struct logininfo *li) 1296{ 1297 struct utmpx utx; 1298 1299 construct_utmpx(li, &utx); 1300 return (wtmpx_write(li, &utx)); 1301} 1302 1303 1304int 1305wtmpx_write_entry(struct logininfo *li) 1306{ 1307 switch(li->type) { 1308 case LTYPE_LOGIN: 1309 return (wtmpx_perform_login(li)); 1310 case LTYPE_LOGOUT: 1311 return (wtmpx_perform_logout(li)); 1312 default: 1313 logit("%s: invalid type field", __func__); 1314 return (0); 1315 } 1316} 1317 1318/* Please see the notes above wtmp_islogin() for information about the 1319 next two functions */ 1320 1321/* Return true if this wtmpx entry indicates a login */ 1322static int 1323wtmpx_islogin(struct logininfo *li, struct utmpx *utx) 1324{ 1325 if (strncmp(li->username, utx->ut_user, 1326 MIN_SIZEOF(li->username, utx->ut_user)) == 0 ) { 1327# ifdef HAVE_TYPE_IN_UTMPX 1328 if (utx->ut_type == USER_PROCESS) 1329 return (1); 1330# else 1331 return (1); 1332# endif 1333 } 1334 return (0); 1335} 1336 1337 1338int 1339wtmpx_get_entry(struct logininfo *li) 1340{ 1341 struct stat st; 1342 struct utmpx utx; 1343 int fd, found=0; 1344 1345 /* Clear the time entries */ 1346 li->tv_sec = li->tv_usec = 0; 1347 1348 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { 1349 logit("%s: problem opening %s: %s", __func__, 1350 WTMPX_FILE, strerror(errno)); 1351 return (0); 1352 } 1353 if (fstat(fd, &st) != 0) { 1354 logit("%s: couldn't stat %s: %s", __func__, 1355 WTMPX_FILE, strerror(errno)); 1356 close(fd); 1357 return (0); 1358 } 1359 1360 /* Seek to the start of the last struct utmpx */ 1361 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) { 1362 /* probably a newly rotated wtmpx file */ 1363 close(fd); 1364 return (0); 1365 } 1366 1367 while (!found) { 1368 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) { 1369 logit("%s: read of %s failed: %s", __func__, 1370 WTMPX_FILE, strerror(errno)); 1371 close (fd); 1372 return (0); 1373 } 1374 /* 1375 * Logouts are recorded as a blank username on a particular 1376 * line. So, we just need to find the username in struct utmpx 1377 */ 1378 if (wtmpx_islogin(li, &utx)) { 1379 found = 1; 1380# if defined(HAVE_TV_IN_UTMPX) 1381 li->tv_sec = utx.ut_tv.tv_sec; 1382# elif defined(HAVE_TIME_IN_UTMPX) 1383 li->tv_sec = utx.ut_time; 1384# endif 1385 line_fullname(li->line, utx.ut_line, sizeof(li->line)); 1386# if defined(HAVE_HOST_IN_UTMPX) 1387 strlcpy(li->hostname, utx.ut_host, 1388 MIN_SIZEOF(li->hostname, utx.ut_host)); 1389# endif 1390 continue; 1391 } 1392 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) { 1393 close(fd); 1394 return (0); 1395 } 1396 } 1397 1398 close(fd); 1399 return (1); 1400} 1401#endif /* USE_WTMPX */ 1402 1403/** 1404 ** Low-level libutil login() functions 1405 **/ 1406 1407#ifdef USE_LOGIN 1408static int 1409syslogin_perform_login(struct logininfo *li) 1410{ 1411 struct utmp *ut; 1412 1413 ut = xmalloc(sizeof(*ut)); 1414 construct_utmp(li, ut); 1415 login(ut); 1416 free(ut); 1417 1418 return (1); 1419} 1420 1421static int 1422syslogin_perform_logout(struct logininfo *li) 1423{ 1424# ifdef HAVE_LOGOUT 1425 char line[UT_LINESIZE]; 1426 1427 (void)line_stripname(line, li->line, sizeof(line)); 1428 1429 if (!logout(line)) 1430 logit("%s: logout() returned an error", __func__); 1431# ifdef HAVE_LOGWTMP 1432 else 1433 logwtmp(line, "", ""); 1434# endif 1435 /* FIXME: (ATL - if the need arises) What to do if we have 1436 * login, but no logout? what if logout but no logwtmp? All 1437 * routines are in libutil so they should all be there, 1438 * but... */ 1439# endif 1440 return (1); 1441} 1442 1443int 1444syslogin_write_entry(struct logininfo *li) 1445{ 1446 switch (li->type) { 1447 case LTYPE_LOGIN: 1448 return (syslogin_perform_login(li)); 1449 case LTYPE_LOGOUT: 1450 return (syslogin_perform_logout(li)); 1451 default: 1452 logit("%s: Invalid type field", __func__); 1453 return (0); 1454 } 1455} 1456#endif /* USE_LOGIN */ 1457 1458/* end of file log-syslogin.c */ 1459 1460/** 1461 ** Low-level lastlog functions 1462 **/ 1463 1464#ifdef USE_LASTLOG 1465 1466#if !defined(LASTLOG_WRITE_PUTUTXLINE) || !defined(HAVE_GETLASTLOGXBYNAME) 1467/* open the file (using filemode) and seek to the login entry */ 1468static int 1469lastlog_openseek(struct logininfo *li, int *fd, int filemode) 1470{ 1471 off_t offset; 1472 char lastlog_file[1024]; 1473 struct stat st; 1474 1475 if (stat(LASTLOG_FILE, &st) != 0) { 1476 logit("%s: Couldn't stat %s: %s", __func__, 1477 LASTLOG_FILE, strerror(errno)); 1478 return (0); 1479 } 1480 if (S_ISDIR(st.st_mode)) { 1481 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", 1482 LASTLOG_FILE, li->username); 1483 } else if (S_ISREG(st.st_mode)) { 1484 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); 1485 } else { 1486 logit("%s: %.100s is not a file or directory!", __func__, 1487 LASTLOG_FILE); 1488 return (0); 1489 } 1490 1491 *fd = open(lastlog_file, filemode, 0600); 1492 if (*fd < 0) { 1493 debug("%s: Couldn't open %s: %s", __func__, 1494 lastlog_file, strerror(errno)); 1495 return (0); 1496 } 1497 1498 if (S_ISREG(st.st_mode)) { 1499 /* find this uid's offset in the lastlog file */ 1500 offset = (off_t) ((long)li->uid * sizeof(struct lastlog)); 1501 1502 if (lseek(*fd, offset, SEEK_SET) != offset) { 1503 logit("%s: %s->lseek(): %s", __func__, 1504 lastlog_file, strerror(errno)); 1505 return (0); 1506 } 1507 } 1508 1509 return (1); 1510} 1511#endif /* !LASTLOG_WRITE_PUTUTXLINE || !HAVE_GETLASTLOGXBYNAME */ 1512 1513#ifdef LASTLOG_WRITE_PUTUTXLINE 1514int 1515lastlog_write_entry(struct logininfo *li) 1516{ 1517 switch(li->type) { 1518 case LTYPE_LOGIN: 1519 return 1; /* lastlog written by pututxline */ 1520 default: 1521 logit("lastlog_write_entry: Invalid type field"); 1522 return 0; 1523 } 1524} 1525#else /* LASTLOG_WRITE_PUTUTXLINE */ 1526int 1527lastlog_write_entry(struct logininfo *li) 1528{ 1529 struct lastlog last; 1530 int fd; 1531 1532 switch(li->type) { 1533 case LTYPE_LOGIN: 1534 /* create our struct lastlog */ 1535 memset(&last, '\0', sizeof(last)); 1536 line_stripname(last.ll_line, li->line, sizeof(last.ll_line)); 1537 strlcpy(last.ll_host, li->hostname, 1538 MIN_SIZEOF(last.ll_host, li->hostname)); 1539 last.ll_time = li->tv_sec; 1540 1541 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) 1542 return (0); 1543 1544 /* write the entry */ 1545 if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) { 1546 close(fd); 1547 logit("%s: Error writing to %s: %s", __func__, 1548 LASTLOG_FILE, strerror(errno)); 1549 return (0); 1550 } 1551 1552 close(fd); 1553 return (1); 1554 default: 1555 logit("%s: Invalid type field", __func__); 1556 return (0); 1557 } 1558} 1559#endif /* LASTLOG_WRITE_PUTUTXLINE */ 1560 1561#ifdef HAVE_GETLASTLOGXBYNAME 1562int 1563lastlog_get_entry(struct logininfo *li) 1564{ 1565 struct lastlogx l, *ll; 1566 1567 if ((ll = getlastlogxbyname(li->username, &l)) == NULL) { 1568 memset(&l, '\0', sizeof(l)); 1569 ll = &l; 1570 } 1571 line_fullname(li->line, ll->ll_line, sizeof(li->line)); 1572 strlcpy(li->hostname, ll->ll_host, 1573 MIN_SIZEOF(li->hostname, ll->ll_host)); 1574 li->tv_sec = ll->ll_tv.tv_sec; 1575 li->tv_usec = ll->ll_tv.tv_usec; 1576 return (1); 1577} 1578#else /* HAVE_GETLASTLOGXBYNAME */ 1579int 1580lastlog_get_entry(struct logininfo *li) 1581{ 1582 struct lastlog last; 1583 int fd, ret; 1584 1585 if (!lastlog_openseek(li, &fd, O_RDONLY)) 1586 return (0); 1587 1588 ret = atomicio(read, fd, &last, sizeof(last)); 1589 close(fd); 1590 1591 switch (ret) { 1592 case 0: 1593 memset(&last, '\0', sizeof(last)); 1594 /* FALLTHRU */ 1595 case sizeof(last): 1596 line_fullname(li->line, last.ll_line, sizeof(li->line)); 1597 strlcpy(li->hostname, last.ll_host, 1598 MIN_SIZEOF(li->hostname, last.ll_host)); 1599 li->tv_sec = last.ll_time; 1600 return (1); 1601 case -1: 1602 error("%s: Error reading from %s: %s", __func__, 1603 LASTLOG_FILE, strerror(errno)); 1604 return (0); 1605 default: 1606 error("%s: Error reading from %s: Expecting %d, got %d", 1607 __func__, LASTLOG_FILE, (int)sizeof(last), ret); 1608 return (0); 1609 } 1610 1611 /* NOTREACHED */ 1612 return (0); 1613} 1614#endif /* HAVE_GETLASTLOGXBYNAME */ 1615#endif /* USE_LASTLOG */ 1616 1617#if 1 1618int 1619utmpx_get_entry(struct logininfo *li) 1620{ 1621 struct utmpx *utx; 1622 1623 if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) 1624 return (0); 1625 utx = getutxuser(li->username); 1626 if (utx == NULL) { 1627 endutxent(); 1628 return (0); 1629 } 1630 1631 line_fullname(li->line, utx->ut_line, 1632 MIN_SIZEOF(li->line, utx->ut_line)); 1633 strlcpy(li->hostname, utx->ut_host, 1634 MIN_SIZEOF(li->hostname, utx->ut_host)); 1635 li->tv_sec = utx->ut_tv.tv_sec; 1636 li->tv_usec = utx->ut_tv.tv_usec; 1637 endutxent(); 1638 return (1); 1639} 1640#endif 1641 1642#ifdef USE_BTMP 1643 /* 1644 * Logs failed login attempts in _PATH_BTMP if that exists. 1645 * The most common login failure is to give password instead of username. 1646 * So the _PATH_BTMP file checked for the correct permission, so that 1647 * only root can read it. 1648 */ 1649 1650void 1651record_failed_login(const char *username, const char *hostname, 1652 const char *ttyn) 1653{ 1654 int fd; 1655 struct utmp ut; 1656 struct sockaddr_storage from; 1657 socklen_t fromlen = sizeof(from); 1658 struct sockaddr_in *a4; 1659 struct sockaddr_in6 *a6; 1660 time_t t; 1661 struct stat fst; 1662 1663 if (geteuid() != 0) 1664 return; 1665 if ((fd = open(_PATH_BTMP, O_WRONLY | O_APPEND)) < 0) { 1666 debug("Unable to open the btmp file %s: %s", _PATH_BTMP, 1667 strerror(errno)); 1668 return; 1669 } 1670 if (fstat(fd, &fst) < 0) { 1671 logit("%s: fstat of %s failed: %s", __func__, _PATH_BTMP, 1672 strerror(errno)); 1673 goto out; 1674 } 1675 if((fst.st_mode & (S_IRWXG | S_IRWXO)) || (fst.st_uid != 0)){ 1676 logit("Excess permission or bad ownership on file %s", 1677 _PATH_BTMP); 1678 goto out; 1679 } 1680 1681 memset(&ut, 0, sizeof(ut)); 1682 /* strncpy because we don't necessarily want nul termination */ 1683 strncpy(ut.ut_user, username, sizeof(ut.ut_user)); 1684 strlcpy(ut.ut_line, "ssh:notty", sizeof(ut.ut_line)); 1685 1686 time(&t); 1687 ut.ut_time = t; /* ut_time is not always a time_t */ 1688 ut.ut_type = LOGIN_PROCESS; 1689 ut.ut_pid = getpid(); 1690 1691 /* strncpy because we don't necessarily want nul termination */ 1692 strncpy(ut.ut_host, hostname, sizeof(ut.ut_host)); 1693 1694 if (packet_connection_is_on_socket() && 1695 getpeername(packet_get_connection_in(), 1696 (struct sockaddr *)&from, &fromlen) == 0) { 1697 ipv64_normalise_mapped(&from, &fromlen); 1698 if (from.ss_family == AF_INET) { 1699 a4 = (struct sockaddr_in *)&from; 1700 memcpy(&ut.ut_addr, &(a4->sin_addr), 1701 MIN_SIZEOF(ut.ut_addr, a4->sin_addr)); 1702 } 1703#ifdef HAVE_ADDR_V6_IN_UTMP 1704 if (from.ss_family == AF_INET6) { 1705 a6 = (struct sockaddr_in6 *)&from; 1706 memcpy(&ut.ut_addr_v6, &(a6->sin6_addr), 1707 MIN_SIZEOF(ut.ut_addr_v6, a6->sin6_addr)); 1708 } 1709#endif 1710 } 1711 1712 if (atomicio(vwrite, fd, &ut, sizeof(ut)) != sizeof(ut)) 1713 error("Failed to write to %s: %s", _PATH_BTMP, 1714 strerror(errno)); 1715 1716out: 1717 close(fd); 1718} 1719#endif /* USE_BTMP */ 1720