From 97c26c1924b076ef23ebe4381558e8aa025712b2 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 16:54:37 +0200 Subject: Adding upstream version 1:4.13+dfsg1. Signed-off-by: Daniel Baumann --- src/grpck.c | 875 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 875 insertions(+) create mode 100644 src/grpck.c (limited to 'src/grpck.c') diff --git a/src/grpck.c b/src/grpck.c new file mode 100644 index 0000000..881fb4d --- /dev/null +++ b/src/grpck.c @@ -0,0 +1,875 @@ +/* + * SPDX-FileCopyrightText: 1992 - 1994, Julianne Frances Haugh + * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz + * SPDX-FileCopyrightText: 2001 , Michał Moskal + * SPDX-FileCopyrightText: 2001 - 2006, Tomasz Kłoczko + * SPDX-FileCopyrightText: 2007 - 2011, Nicolas François + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include + +#include +#include +#include +#include +#include +#include "chkname.h" +#include "commonio.h" +#include "defines.h" +#include "groupio.h" +#include "nscd.h" +#include "sssd.h" +#include "prototypes.h" +#include "shadowlog.h" + +#ifdef SHADOWGRP +#include "sgroupio.h" +#endif + +/* + * Exit codes + */ +/*@-exitarg@*/ +#define E_OKAY 0 +#define E_SUCCESS 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 + */ +const char *Prog; + +static const char *grp_file = GROUP_FILE; +static bool use_system_grp_file = true; + +#ifdef SHADOWGRP +static const char *sgr_file = SGROUP_FILE; +static bool use_system_sgr_file = true; +static bool is_shadow = false; +static bool sgr_locked = false; +#endif +static bool gr_locked = false; +/* Options */ +static bool read_only = false; +static bool sort_mode = false; +static bool silence_warnings = false; + +/* local function prototypes */ +static void fail_exit (int status); +static /*@noreturn@*/void usage (int status); +static void delete_member (char **, const char *); +static void process_flags (int argc, char **argv); +static void open_files (void); +static void close_files (bool changed); +static int check_members (const char *groupname, + char **members, + const char *fmt_info, + const char *fmt_prompt, + const char *fmt_syslog, + int *errors); +static void check_grp_file (int *errors, bool *changed); +#ifdef SHADOWGRP +static void compare_members_lists (const char *groupname, + char **members, + char **other_members, + const char *file, + const char *other_file); +static void check_sgr_file (int *errors, bool *changed); +#endif + +/* + * fail_exit - exit with an error code after unlocking files + */ +static void fail_exit (int status) +{ + if (gr_locked) { + if (gr_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ()); + SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ())); + /* continue */ + } + } + +#ifdef SHADOWGRP + if (sgr_locked) { + if (sgr_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ()); + SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ())); + /* continue */ + } + } +#endif + + closelog (); + + exit (status); +} + +/* + * usage - print syntax message and exit + */ +static /*@noreturn@*/void usage (int status) +{ + FILE *usageout = (E_SUCCESS != status) ? stderr : stdout; +#ifdef SHADOWGRP + (void) fprintf (usageout, + _("Usage: %s [options] [group [gshadow]]\n" + "\n" + "Options:\n"), + Prog); +#else /* !SHADOWGRP */ + (void) fprintf (usageout, + _("Usage: %s [options] [group]\n" + "\n" + "Options:\n"), + Prog); +#endif /* !SHADOWGRP */ + (void) fputs (_(" -h, --help display this help message and exit\n"), usageout); + (void) fputs (_(" -r, --read-only display errors and warnings\n" + " but do not change files\n"), usageout); + (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout); + (void) fputs (_(" -s, --sort sort entries by UID\n"), usageout); + (void) fputs (_(" -S, --silence-warnings silence controversial/paranoid warnings\n"), usageout); + (void) fputs ("\n", usageout); + exit (status); +} + +/* + * delete_member - delete an entry in a list of members + * + * It only deletes the first entry with the given name. + * The member is defined by its address, no string comparison are + * performed. + */ +static void delete_member (char **list, const char *member) +{ + int i; + + for (i = 0; NULL != list[i]; i++) { + if (list[i] == member) { + break; + } + } + + for (; NULL != list[i]; i++) { + list[i] = list[i + 1]; + } +} + +/* + * process_flags - parse the command line options + * + * It will not return if an error is encountered. + */ +static void process_flags (int argc, char **argv) +{ + int c; + static struct option long_options[] = { + {"help", no_argument, NULL, 'h'}, + {"quiet", no_argument, NULL, 'q'}, + {"read-only", no_argument, NULL, 'r'}, + {"root", required_argument, NULL, 'R'}, + {"silence-warnings", no_argument, NULL, 'S'}, + {"sort", no_argument, NULL, 's'}, + {NULL, 0, NULL, '\0'} + }; + + /* + * Parse the command line arguments + */ + while ((c = getopt_long (argc, argv, "hqrR:sS", + long_options, NULL)) != -1) { + switch (c) { + case 'h': + usage (E_SUCCESS); + /*@notreached@*/break; + case 'q': + /* quiet - ignored for now */ + break; + case 'r': + read_only = true; + break; + case 'R': /* no-op, handled in process_root_flag () */ + break; + case 's': + sort_mode = true; + break; + case 'S': + silence_warnings = true; + break; + default: + usage (E_USAGE); + } + } + + if (sort_mode && read_only) { + fprintf (stderr, _("%s: -s and -r are incompatible\n"), Prog); + exit (E_USAGE); + } + + /* + * Make certain we have the right number of arguments + */ +#ifdef SHADOWGRP + if (argc > (optind + 2)) +#else + if (argc > (optind + 1)) +#endif + { + usage (E_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_setdbname (grp_file); + use_system_grp_file = false; + } +#ifdef SHADOWGRP + if ((optind + 2) == argc) { + sgr_file = argv[optind + 1]; + sgr_setdbname (sgr_file); + is_shadow = true; + use_system_sgr_file = false; + } else if (optind == argc) { + is_shadow = sgr_file_present (); + } +#endif +} + +/* + * open_files - open the shadow database + * + * In read-only mode, the databases are not locked and are opened + * only for reading. + */ +static void open_files (void) +{ + /* + * Lock the files if we aren't in "read-only" mode + */ + if (!read_only) { + if (gr_lock () == 0) { + fprintf (stderr, + _("%s: cannot lock %s; try again later.\n"), + Prog, grp_file); + fail_exit (E_CANT_LOCK); + } + gr_locked = true; +#ifdef SHADOWGRP + if (is_shadow) { + if (sgr_lock () == 0) { + fprintf (stderr, + _("%s: cannot lock %s; try again later.\n"), + Prog, sgr_file); + fail_exit (E_CANT_LOCK); + } + sgr_locked = true; + } +#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_CREAT | O_RDWR) == 0) { + fprintf (stderr, _("%s: cannot open %s\n"), Prog, + grp_file); + if (use_system_grp_file) { + SYSLOG ((LOG_WARN, "cannot open %s", grp_file)); + } + fail_exit (E_CANT_OPEN); + } +#ifdef SHADOWGRP + if (is_shadow && (sgr_open (read_only ? O_RDONLY : O_CREAT | O_RDWR) == 0)) { + fprintf (stderr, _("%s: cannot open %s\n"), Prog, + sgr_file); + if (use_system_sgr_file) { + SYSLOG ((LOG_WARN, "cannot open %s", sgr_file)); + } + fail_exit (E_CANT_OPEN); + } +#endif +} + +/* + * close_files - close and unlock the group/gshadow databases + * + * If changed is not set, the databases are not closed, and no + * changes are committed in the databases. The databases are + * unlocked anyway. + */ +static void close_files (bool changed) +{ + /* + * All done. If there were no change we can just abandon any + * changes to the files. + */ + if (changed) { + if (gr_close () == 0) { + fprintf (stderr, _("%s: failure while writing changes to %s\n"), + Prog, grp_file); + fail_exit (E_CANT_UPDATE); + } +#ifdef SHADOWGRP + if (is_shadow && (sgr_close () == 0)) { + fprintf (stderr, _("%s: failure while writing changes to %s\n"), + Prog, sgr_file); + fail_exit (E_CANT_UPDATE); + } +#endif + } + + /* + * Don't be anti-social - unlock the files when you're done. + */ +#ifdef SHADOWGRP + if (sgr_locked) { + if (sgr_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ()); + SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ())); + /* continue */ + } + sgr_locked = false; + } +#endif + if (gr_locked) { + if (gr_unlock () == 0) { + fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ()); + SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ())); + /* continue */ + } + gr_locked = false; + } +} + +/* + * check_members - check that every members of a group exist + * + * If an error is detected, *errors is incremented. + * + * The user will be prompted for the removal of the non-existent + * user. + * + * If any changes are performed, the return value will be 1, + * otherwise check_members() returns 0. + * + * fmt_info, fmt_prompt, and fmt_syslog are used for logging. + * * fmt_info must contain two string flags (%s): for the group's + * name and the missing member. + * * fmt_prompt must contain one string flags (%s): the missing + * member. + * * fmt_syslog must contain two string flags (%s): for the + * group's name and the missing member. + */ +static int check_members (const char *groupname, + char **members, + const char *fmt_info, + const char *fmt_prompt, + const char *fmt_syslog, + int *errors) +{ + int i; + int members_changed = 0; + + /* + * Make sure each member exists + */ + for (i = 0; NULL != members[i]; i++) { + /* local, no need for xgetpwnam */ + if (getpwnam (members[i]) != NULL) { + continue; + } + /* + * Can't find this user. Remove them + * from the list. + */ + *errors += 1; + printf (fmt_info, groupname, members[i]); + printf (fmt_prompt, members[i]); + + if (!yes_or_no (read_only)) { + continue; + } + + SYSLOG ((LOG_INFO, fmt_syslog, members[i], groupname)); + members_changed = 1; + delete_member (members, members[i]); + + /* Rewind in case of removal */ + i--; + } + + return members_changed; +} + +#ifdef SHADOWGRP +/* + * compare_members_lists - make sure the list of members is contained in + * another list. + * + * compare_members_lists() checks that all the members of members are + * also in other_members. + * file and other_file are used for logging. + * + * TODO: No changes are performed on the lists. + */ +static void compare_members_lists (const char *groupname, + char **members, + char **other_members, + const char *file, + const char *other_file) +{ + char **pmem, **other_pmem; + + for (pmem = members; NULL != *pmem; pmem++) { + for (other_pmem = other_members; NULL != *other_pmem; other_pmem++) { + if (strcmp (*pmem, *other_pmem) == 0) { + break; + } + } + if (!silence_warnings && *other_pmem == NULL) { + printf + ("'%s' is a member of the '%s' group in %s but not in %s\n", + *pmem, groupname, file, other_file); + } + } +} +#endif /* SHADOWGRP */ + +/* + * check_grp_file - check the content of the group file + */ +static void check_grp_file (int *errors, bool *changed) +{ + struct commonio_entry *gre, *tgre; + struct group *grp; +#ifdef SHADOWGRP + const struct sgrp *sgr; +#endif + + /* + * Loop through the entire group file. + */ + for (gre = __gr_get_head (); NULL != 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 (NULL == gre->eptr) { + + /* + * Tell the user this entire line is bogus and ask + * them to delete it. + */ + (void) puts (_("invalid group file entry")); + printf (_("delete line '%s'? "), gre->line); + *errors += 1; + + /* + * prompt the user to delete the entry or not + */ + if (!yes_or_no (read_only)) { + 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'", + gre->line)); + *changed = true; + + __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 (); NULL != 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 (NULL == 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. + */ + (void) puts (_("duplicate group entry")); + printf (_("delete line '%s'? "), gre->line); + *errors += 1; + + /* + * prompt the user to delete the entry or not + */ + if (yes_or_no (read_only)) { + goto delete_gr; + } + } + + /* + * Check for invalid group names. --marekm + */ + if (!is_valid_group_name (grp->gr_name)) { + *errors += 1; + printf (_("invalid group name '%s'\n"), grp->gr_name); + } + + /* + * Check for invalid group ID. + */ + if (grp->gr_gid == (gid_t)-1) { + printf (_("invalid group ID '%lu'\n"), (long unsigned int)grp->gr_gid); + *errors += 1; + } + + /* + * 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 ( (NULL != grp->gr_mem[0]) + && (NULL == grp->gr_mem[1]) + && ('\0' == grp->gr_mem[0][0])) { + grp->gr_mem[0] = NULL; + } + + if (check_members (grp->gr_name, grp->gr_mem, + _("group %s: no user %s\n"), + _("delete member '%s'? "), + "delete member '%s' from group '%s'", + errors) == 1) { + *changed = true; + gre->changed = true; + __gr_set_changed (); + } + +#ifdef SHADOWGRP + /* + * Make sure this entry exists in the /etc/gshadow file. + */ + + if (is_shadow) { + sgr = sgr_locate (grp->gr_name); + if (sgr == NULL) { + printf (_("no matching group file entry in %s\n"), + sgr_file); + printf (_("add group '%s' in %s? "), + grp->gr_name, sgr_file); + *errors += 1; + if (yes_or_no (read_only)) { + struct sgrp sg; + struct group gr; + static char *empty = NULL; + + sg.sg_name = grp->gr_name; + sg.sg_passwd = grp->gr_passwd; + sg.sg_adm = ∅ + sg.sg_mem = grp->gr_mem; + SYSLOG ((LOG_INFO, + "add group '%s' to '%s'", + grp->gr_name, sgr_file)); + *changed = true; + + if (sgr_update (&sg) == 0) { + fprintf (stderr, + _("%s: failed to prepare the new %s entry '%s'\n"), + Prog, sgr_dbname (), sg.sg_name); + fail_exit (E_CANT_UPDATE); + } + /* remove password from /etc/group */ + gr = *grp; + gr.gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */ + if (gr_update (&gr) == 0) { + fprintf (stderr, + _("%s: failed to prepare the new %s entry '%s'\n"), + Prog, gr_dbname (), gr.gr_name); + fail_exit (E_CANT_UPDATE); + } + } + } else { + /** + * Verify that all the members defined in /etc/group are also + * present in /etc/gshadow. + */ + compare_members_lists (grp->gr_name, + grp->gr_mem, sgr->sg_mem, + grp_file, sgr_file); + + /* The group entry has a gshadow counterpart. + * Make sure no passwords are in group. + */ + if (strcmp (grp->gr_passwd, SHADOW_PASSWD_STRING) != 0) { + printf (_("group %s has an entry in %s, but its password field in %s is not set to 'x'\n"), + grp->gr_name, sgr_file, grp_file); + *errors += 1; + } + } + } +#endif + + } +} + +#ifdef SHADOWGRP +/* + * check_sgr_file - check the content of the shadowed group file (gshadow) + */ +static void check_sgr_file (int *errors, bool *changed) +{ + const struct group *grp; + struct commonio_entry *sge, *tsge; + struct sgrp *sgr; + + /* + * Loop through the entire shadow group file. + */ + for (sge = __sgr_get_head (); NULL != 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 (NULL == sge->eptr) { + + /* + * Tell the user this entire line is bogus and ask + * them to delete it. + */ + (void) puts (_("invalid shadow group file entry")); + printf (_("delete line '%s'? "), sge->line); + *errors += 1; + + /* + * prompt the user to delete the entry or not + */ + if (!yes_or_no (read_only)) { + 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'", + sge->line)); + *changed = true; + + __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 (); NULL != 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 (NULL == 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. + */ + (void) puts (_("duplicate shadow group entry")); + printf (_("delete line '%s'? "), sge->line); + *errors += 1; + + /* + * prompt the user to delete the entry or not + */ + if (yes_or_no (read_only)) { + goto delete_sg; + } + } + + /* + * Make sure this entry exists in the /etc/group file. + */ + grp = gr_locate (sgr->sg_name); + if (grp == NULL) { + printf (_("no matching group file entry in %s\n"), + grp_file); + printf (_("delete line '%s'? "), sge->line); + *errors += 1; + if (yes_or_no (read_only)) { + goto delete_sg; + } + } else { + /** + * Verify that the all members defined in /etc/gshadow are also + * present in /etc/group. + */ + compare_members_lists (sgr->sg_name, + sgr->sg_mem, grp->gr_mem, + sgr_file, grp_file); + } + + /* + * Make sure each administrator exists + */ + if (check_members (sgr->sg_name, sgr->sg_adm, + _("shadow group %s: no administrative user %s\n"), + _("delete administrative member '%s'? "), + "delete admin '%s' from shadow group '%s'", + errors) == 1) { + *changed = true; + sge->changed = true; + __sgr_set_changed (); + } + + /* + * Make sure each member exists + */ + if (check_members (sgr->sg_name, sgr->sg_mem, + _("shadow group %s: no user %s\n"), + _("delete member '%s'? "), + "delete member '%s' from shadow group '%s'", + errors) == 1) { + *changed = true; + sge->changed = true; + __sgr_set_changed (); + } + } +} +#endif /* SHADOWGRP */ + +/* + * grpck - verify group file integrity + */ +int main (int argc, char **argv) +{ + int errors = 0; + bool changed = false; + + /* + * Get my name so that I can use it to report errors. + */ + Prog = Basename (argv[0]); + log_set_progname(Prog); + log_set_logfd(stderr); + + (void) setlocale (LC_ALL, ""); + (void) bindtextdomain (PACKAGE, LOCALEDIR); + (void) textdomain (PACKAGE); + + process_root_flag ("-R", argc, argv); + + OPENLOG ("grpck"); + + /* Parse the command line arguments */ + process_flags (argc, argv); + + open_files (); + + if (sort_mode) { + gr_sort (); +#ifdef SHADOWGRP + if (is_shadow) { + sgr_sort (); + } + changed = true; +#endif + } else { + check_grp_file (&errors, &changed); +#ifdef SHADOWGRP + if (is_shadow) { + check_sgr_file (&errors, &changed); + } +#endif + } + + /* Commit the change in the database if needed */ + close_files (changed); + + if (!read_only) { + nscd_flush_cache ("group"); + sssd_flush_cache (SSSD_DB_GROUP); + } + + /* + * Tell the user what we did and exit. + */ + if (0 != errors) { + if (changed) { + printf (_("%s: the files have been updated\n"), Prog); + } else { + printf (_("%s: no changes\n"), Prog); + } + } + + return ((0 != errors) ? E_BAD_ENTRY : E_OKAY); +} + -- cgit v1.2.3