/* * Copyright 1992 - 1994, Julianne Frances Haugh * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Julianne F. Haugh nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include "rcsid.h" RCSID(PKG_VER "$Id: grpck.c,v 1.13 2000/08/26 18:27:18 marekm Exp $") #include #include #include #include "prototypes.h" #include "defines.h" #include "chkname.h" #include #include "commonio.h" #include "groupio.h" extern void __gr_del_entry(const struct commonio_entry *); extern struct commonio_entry *__gr_get_head(void); #ifdef SHADOWGRP #include "sgroupio.h" extern void __sgr_del_entry(const struct commonio_entry *); extern struct commonio_entry *__sgr_get_head(void); #endif /* * Exit codes */ #define E_OKAY 0 #define E_USAGE 1 #define E_BAD_ENTRY 2 #define E_CANT_OPEN 3 #define E_CANT_LOCK 4 #define E_CANT_UPDATE 5 /* * Global variables */ extern int optind; extern char *optarg; /* * Local variables */ static char *Prog; static const char *grp_file = GROUP_FILE; #ifdef SHADOWGRP static const char *sgr_file = SGROUP_FILE; #endif static int read_only = 0; /* local function prototypes */ static void usage(void); static int yes_or_no(void); static void delete_member(char **, const char *); /* * usage - print syntax message and exit */ static void usage(void) { #ifdef SHADOWGRP fprintf(stderr, _("Usage: %s [ -r ] [ group [ gshadow ] ]\n"), Prog); #else fprintf(stderr, _("Usage: %s [ -r ] [ group ]\n"), Prog); #endif exit(E_USAGE); } /* * yes_or_no - get answer to question from the user */ static int yes_or_no(void) { char buf[80]; /* * In read-only mode all questions are answered "no". */ if (read_only) { puts(_("No")); return 0; } /* * Get a line and see what the first character is. */ if (fgets(buf, sizeof buf, stdin)) return buf[0] == 'y' || buf[0] == 'Y'; return 0; } /* * delete_member - delete an entry in a list of members */ static void delete_member(char **list, const char *member) { int i; for (i = 0; list[i]; i++) if (list[i] == member) break; if (list[i]) for (; list[i]; i++) list[i] = list[i + 1]; } /* * grpck - verify group file integrity */ int main(int argc, char **argv) { int arg; int errors = 0; int deleted = 0; int i; struct commonio_entry *gre, *tgre; struct group *grp; #ifdef SHADOWGRP struct commonio_entry *sge, *tsge; struct sgrp *sgr; int is_shadow = 0; #endif /* * Get my name so that I can use it to report errors. */ Prog = Basename(argv[0]); setlocale(LC_ALL, ""); bindtextdomain(PACKAGE, LOCALEDIR); textdomain(PACKAGE); openlog(Prog, LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_AUTH); /* * Parse the command line arguments */ while ((arg = getopt(argc, argv, "qr")) != EOF) { switch (arg) { case 'q': /* quiet - ignored for now */ break; case 'r': read_only = 1; break; default: usage(); } } /* * Make certain we have the right number of arguments */ #ifdef SHADOWGRP if (optind != argc && optind + 1 != argc && optind + 2 != argc) #else if (optind != argc && optind + 1 != argc) #endif usage(); /* * If there are two left over filenames, use those as the * group and group password filenames. */ if (optind != argc) { grp_file = argv[optind]; gr_name(grp_file); } #ifdef SHADOWGRP if (optind + 2 == argc) { sgr_file = argv[optind + 1]; sgr_name(sgr_file); is_shadow = 1; } else if (optind == argc) is_shadow = sgr_file_present(); #endif /* * Lock the files if we aren't in "read-only" mode */ if (!read_only) { if (!gr_lock()) { fprintf(stderr, _("%s: cannot lock file %s\n"), Prog, grp_file); if (optind == argc) SYSLOG((LOG_WARN,"cannot lock %s\n",grp_file)); closelog(); exit(E_CANT_LOCK); } #ifdef SHADOWGRP if (is_shadow && !sgr_lock()) { fprintf(stderr, _("%s: cannot lock file %s\n"), Prog, sgr_file); if (optind == argc) SYSLOG((LOG_WARN,"cannot lock %s\n",sgr_file)); closelog(); exit(E_CANT_LOCK); } #endif } /* * Open the files. Use O_RDONLY if we are in read_only mode, * O_RDWR otherwise. */ if (!gr_open(read_only ? O_RDONLY : O_RDWR)) { fprintf(stderr, _("%s: cannot open file %s\n"), Prog, grp_file); if (optind == argc) SYSLOG((LOG_WARN, "cannot open %s\n", grp_file)); closelog(); exit(E_CANT_OPEN); } #ifdef SHADOWGRP if (is_shadow && !sgr_open(read_only ? O_RDONLY : O_RDWR)) { fprintf(stderr, _("%s: cannot open file %s\n"), Prog, sgr_file); if (optind == argc) SYSLOG((LOG_WARN, "cannot open %s\n", sgr_file)); closelog(); exit(E_CANT_OPEN); } #endif /* * Loop through the entire group file. */ for (gre = __gr_get_head(); gre; gre = gre->next) { /* * Skip all NIS entries. */ if (gre->line[0] == '+' || gre->line[0] == '-') continue; /* * Start with the entries that are completely corrupt. * They have no (struct group) entry because they couldn't * be parsed properly. */ if (!gre->eptr) { /* * Tell the user this entire line is bogus and * ask them to delete it. */ printf(_("invalid group file entry\n")); printf(_("delete line `%s'? "), gre->line); errors++; /* * prompt the user to delete the entry or not */ if (!yes_or_no()) continue; /* * All group file deletions wind up here. This * code removes the current entry from the linked * list. When done, it skips back to the top of * the loop to try out the next list element. */ delete_gr: SYSLOG((LOG_INFO, "delete group line `%s'\n", gre->line)); deleted++; __gr_del_entry(gre); continue; } /* * Group structure is good, start using it. */ grp = gre->eptr; /* * Make sure this entry has a unique name. */ for (tgre = __gr_get_head(); tgre; tgre = tgre->next) { const struct group *ent = tgre->eptr; /* * Don't check this entry */ if (tgre == gre) continue; /* * Don't check invalid entries. */ if (!ent) continue; if (strcmp(grp->gr_name, ent->gr_name) != 0) continue; /* * Tell the user this entry is a duplicate of * another and ask them to delete it. */ puts(_("duplicate group entry\n")); printf(_("delete line `%s'? "), gre->line); errors++; /* * prompt the user to delete the entry or not */ if (yes_or_no()) goto delete_gr; } /* * Check for invalid group names. --marekm */ if (!check_group_name(grp->gr_name)) { errors++; printf(_("invalid group name `%s'\n"), grp->gr_name); } /* * Check for a Slackware bug. Make sure GID is not -1 * (it has special meaning for some syscalls). --marekm */ if (grp->gr_gid == (gid_t) -1) { errors++; printf(_("group %s: bad GID (%d)\n"), grp->gr_name, (int) grp->gr_gid); } /* * Workaround for a NYS libc 5.3.12 bug on RedHat 4.2 - * groups with no members are returned as groups with * one member "", causing grpck to fail. --marekm */ if (grp->gr_mem[0] && !grp->gr_mem[1] && *(grp->gr_mem[0]) == '\0') grp->gr_mem[0] = (char *) 0; /* * Make sure each member exists */ for (i = 0; grp->gr_mem[i]; i++) { if (getpwnam(grp->gr_mem[i])) continue; /* * Can't find this user. Remove them * from the list. */ errors++; printf(_("group %s: no user %s\n"), grp->gr_name, grp->gr_mem[i]); printf(_("delete member `%s'? "), grp->gr_mem[i]); if (!yes_or_no()) continue; SYSLOG((LOG_INFO, "delete member `%s' group `%s'\n", grp->gr_mem[i], grp->gr_name)); deleted++; delete_member(grp->gr_mem, grp->gr_mem[i]); gre->changed = 1; __gr_set_changed(); } } #ifdef SHADOWGRP if (!is_shadow) goto shadow_done; /* * Loop through the entire shadow group file. */ for (sge = __sgr_get_head(); sge; sge = sge->next) { /* * Start with the entries that are completely corrupt. * They have no (struct sgrp) entry because they couldn't * be parsed properly. */ if (!sge->eptr) { /* * Tell the user this entire line is bogus and * ask them to delete it. */ printf(_("invalid shadow group file entry\n")); printf(_("delete line `%s'? "), sge->line); errors++; /* * prompt the user to delete the entry or not */ if (!yes_or_no()) continue; /* * All shadow group file deletions wind up here. * This code removes the current entry from the * linked list. When done, it skips back to the * top of the loop to try out the next list element. */ delete_sg: SYSLOG((LOG_INFO, "delete shadow line `%s'\n", sge->line)); deleted++; __sgr_del_entry(sge); continue; } /* * Shadow group structure is good, start using it. */ sgr = sge->eptr; /* * Make sure this entry has a unique name. */ for (tsge = __sgr_get_head(); tsge; tsge = tsge->next) { const struct sgrp *ent = tsge->eptr; /* * Don't check this entry */ if (tsge == sge) continue; /* * Don't check invalid entries. */ if (!ent) continue; if (strcmp(sgr->sg_name, ent->sg_name) != 0) continue; /* * Tell the user this entry is a duplicate of * another and ask them to delete it. */ puts(_("duplicate shadow group entry\n")); printf(_("delete line `%s'? "), sge->line); errors++; /* * prompt the user to delete the entry or not */ if (yes_or_no()) goto delete_sg; } /* * Make sure this entry exists in the /etc/group file. */ if (!gr_locate(sgr->sg_name)) { puts(_("no matching group file entry\n")); printf(_("delete line `%s'? "), sge->line); errors++; if (yes_or_no()) goto delete_sg; } /* * Make sure each administrator exists */ for (i = 0; sgr->sg_adm[i]; i++) { if (getpwnam(sgr->sg_adm[i])) continue; /* * Can't find this user. Remove them * from the list. */ errors++; printf(_("shadow group %s: no administrative user %s\n"), sgr->sg_name, sgr->sg_adm[i]); printf(_("delete administrative member `%s'? "), sgr->sg_adm[i]); if (!yes_or_no()) continue; SYSLOG((LOG_INFO, "delete admin `%s' from shadow group `%s'\n", sgr->sg_adm[i], sgr->sg_name)); deleted++; delete_member(sgr->sg_adm, sgr->sg_adm[i]); sge->changed = 1; __sgr_set_changed(); } /* * Make sure each member exists */ for (i = 0; sgr->sg_mem[i]; i++) { if (getpwnam(sgr->sg_mem[i])) continue; /* * Can't find this user. Remove them * from the list. */ errors++; printf(_("shadow group %s: no user %s\n"), sgr->sg_name, sgr->sg_mem[i]); printf(_("delete member `%s'? "), sgr->sg_mem[i]); if (!yes_or_no()) continue; SYSLOG((LOG_INFO, "delete member `%s' from shadow group `%s'\n", sgr->sg_mem[i], sgr->sg_name)); deleted++; delete_member(sgr->sg_mem, sgr->sg_mem[i]); sge->changed = 1; __sgr_set_changed(); } } shadow_done: #endif /* SHADOWGRP */ /* * All done. If there were no deletions we can just abandon any * changes to the files. */ if (deleted) { if (!gr_close()) { fprintf(stderr, _("%s: cannot update file %s\n"), Prog, grp_file); exit(E_CANT_UPDATE); } #ifdef SHADOWGRP if (is_shadow && !sgr_close()) { fprintf(stderr, _("%s: cannot update file %s\n"), Prog, sgr_file); exit(E_CANT_UPDATE); } #endif } /* * Don't be anti-social - unlock the files when you're done. */ #ifdef SHADOWGRP if (is_shadow) sgr_unlock(); #endif (void) gr_unlock(); /* * Tell the user what we did and exit. */ if (errors) #ifdef NDBM printf(deleted ? _("%s: the files have been updated; run mkpasswd\n") : _("%s: no changes\n"), Prog); #else printf(deleted ? _("%s: the files have been updated\n") : _("%s: no changes\n"), Prog); #endif exit(errors ? E_BAD_ENTRY : E_OKAY); }