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-rw-r--r--src/userdel.c1346
1 files changed, 1346 insertions, 0 deletions
diff --git a/src/userdel.c b/src/userdel.c
new file mode 100644
index 0000000..7012b0e
--- /dev/null
+++ b/src/userdel.c
@@ -0,0 +1,1346 @@
+/*
+ * SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2012, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+#include <assert.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+#include "pam_defs.h"
+#endif /* USE_PAM */
+#endif /* ACCT_TOOLS_SETUID */
+#include "defines.h"
+#include "getdef.h"
+#include "groupio.h"
+#include "nscd.h"
+#include "sssd.h"
+#include "prototypes.h"
+#include "pwauth.h"
+#include "pwio.h"
+#include "shadowio.h"
+#ifdef SHADOWGRP
+#include "sgroupio.h"
+#endif /* SHADOWGRP */
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#endif /* WITH_SELINUX */
+#ifdef WITH_TCB
+#include <tcb.h>
+#include "tcbfuncs.h"
+#endif /* WITH_TCB */
+#include "run_part.h"
+/*@-exitarg@*/
+#include "exitcodes.h"
+#ifdef ENABLE_SUBIDS
+#include "subordinateio.h"
+#endif /* ENABLE_SUBIDS */
+#include "shadowlog.h"
+
+/*
+ * exit status values
+ */
+#define E_PW_UPDATE 1 /* can't update password file */
+#define E_NOTFOUND 6 /* specified user doesn't exist */
+#define E_USER_BUSY 8 /* user currently logged in */
+#define E_GRP_UPDATE 10 /* can't update group file */
+#define E_HOMEDIR 12 /* can't remove home directory */
+#define E_SE_UPDATE 14 /* can't update SELinux user mapping */
+#ifdef ENABLE_SUBIDS
+#define E_SUB_UID_UPDATE 16 /* can't update the subordinate uid file */
+#define E_SUB_GID_UPDATE 18 /* can't update the subordinate gid file */
+#endif /* ENABLE_SUBIDS */
+
+/*
+ * Global variables
+ */
+const char *Prog;
+
+static char *user_name;
+static uid_t user_id;
+static gid_t user_gid;
+static char *user_home;
+
+static bool fflg = false;
+static bool rflg = false;
+#ifdef WITH_SELINUX
+static bool Zflg = false;
+#endif
+static bool Rflg = false;
+
+static bool is_shadow_pwd;
+
+#ifdef SHADOWGRP
+static bool is_shadow_grp;
+static bool sgr_locked = false;
+#endif /* SHADOWGRP */
+static bool pw_locked = false;
+static bool gr_locked = false;
+static bool spw_locked = false;
+#ifdef ENABLE_SUBIDS
+static bool is_sub_uid;
+static bool is_sub_gid;
+static bool sub_uid_locked = false;
+static bool sub_gid_locked = false;
+#endif /* ENABLE_SUBIDS */
+
+static const char* prefix = "";
+
+/* local function prototypes */
+static void usage (int status);
+static void update_groups (void);
+static void remove_usergroup (void);
+static void close_files (void);
+static void fail_exit (int);
+static void open_files (void);
+static void update_user (void);
+static void user_cancel (const char *);
+
+#ifdef EXTRA_CHECK_HOME_DIR
+static bool path_prefix (const char *, const char *);
+#endif /* EXTRA_CHECK_HOME_DIR */
+static int is_owner (uid_t, const char *);
+static int remove_mailbox (void);
+#ifdef WITH_TCB
+static int remove_tcbdir (const char *user_name, uid_t user_id);
+#endif /* WITH_TCB */
+
+/*
+ * usage - display usage message and exit
+ */
+static void usage (int status)
+{
+ FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
+ (void) fprintf (usageout,
+ _("Usage: %s [options] LOGIN\n"
+ "\n"
+ "Options:\n"),
+ Prog);
+ (void) fputs (_(" -f, --force force some actions that would fail otherwise\n"
+ " e.g. removal of user still logged in\n"
+ " or files, even if not owned by the user\n"),
+ usageout);
+ (void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
+ (void) fputs (_(" -r, --remove remove home directory and mail spool\n"), usageout);
+ (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
+ (void) fputs (_(" -P, --prefix PREFIX_DIR prefix directory where are located the /etc/* files\n"), usageout);
+#ifdef WITH_SELINUX
+ (void) fputs (_(" -Z, --selinux-user remove any SELinux user mapping for the user\n"), usageout);
+#endif /* WITH_SELINUX */
+ (void) fputs ("\n", usageout);
+ exit (status);
+}
+
+/*
+ * update_groups - delete user from secondary group set
+ *
+ * update_groups() takes the user name that was given and searches
+ * the group files for membership in any group.
+ *
+ * we also check to see if they have any groups they own (the same
+ * name is their user name) and delete them too (only if USERGROUPS_ENAB
+ * is enabled).
+ */
+static void update_groups (void)
+{
+ const struct group *grp;
+ struct group *ngrp;
+
+#ifdef SHADOWGRP
+ const struct sgrp *sgrp;
+ struct sgrp *nsgrp;
+#endif /* SHADOWGRP */
+
+ /*
+ * Scan through the entire group file looking for the groups that
+ * the user is a member of.
+ */
+ for (gr_rewind (), grp = gr_next (); NULL != grp; grp = gr_next ()) {
+
+ /*
+ * See if the user specified this group as one of their
+ * concurrent groups.
+ */
+ if (!is_on_list (grp->gr_mem, user_name)) {
+ continue;
+ }
+
+ /*
+ * Delete the username from the list of group members and
+ * update the group entry to reflect the change.
+ */
+ ngrp = __gr_dup (grp);
+ if (NULL == ngrp) {
+ fprintf (stderr,
+ _("%s: Out of memory. Cannot update %s.\n"),
+ Prog, gr_dbname ());
+ exit (13); /* XXX */
+ }
+ ngrp->gr_mem = del_list (ngrp->gr_mem, user_name);
+ if (gr_update (ngrp) == 0) {
+ fprintf (stderr,
+ _("%s: failed to prepare the new %s entry '%s'\n"),
+ Prog, gr_dbname (), ngrp->gr_name);
+ exit (E_GRP_UPDATE);
+ }
+
+ /*
+ * Update the DBM group file with the new entry as well.
+ */
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting user from group",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_SUCCESS);
+#endif /* WITH_AUDIT */
+ SYSLOG ((LOG_INFO, "delete '%s' from group '%s'\n",
+ user_name, ngrp->gr_name));
+ }
+
+ if (getdef_bool ("USERGROUPS_ENAB")) {
+ remove_usergroup ();
+ }
+
+#ifdef SHADOWGRP
+ if (!is_shadow_grp) {
+ return;
+ }
+
+ /*
+ * Scan through the entire shadow group file looking for the groups
+ * that the user is a member of. Both the administrative list and
+ * the ordinary membership list is checked.
+ */
+ for (sgr_rewind (), sgrp = sgr_next ();
+ NULL != sgrp;
+ sgrp = sgr_next ()) {
+ bool was_member, was_admin;
+
+ /*
+ * See if the user specified this group as one of their
+ * concurrent groups.
+ */
+ was_member = is_on_list (sgrp->sg_mem, user_name);
+ was_admin = is_on_list (sgrp->sg_adm, user_name);
+
+ if (!was_member && !was_admin) {
+ continue;
+ }
+
+ nsgrp = __sgr_dup (sgrp);
+ if (NULL == nsgrp) {
+ fprintf (stderr,
+ _("%s: Out of memory. Cannot update %s.\n"),
+ Prog, sgr_dbname ());
+ exit (13); /* XXX */
+ }
+
+ if (was_member) {
+ nsgrp->sg_mem = del_list (nsgrp->sg_mem, user_name);
+ }
+
+ if (was_admin) {
+ nsgrp->sg_adm = del_list (nsgrp->sg_adm, user_name);
+ }
+
+ if (sgr_update (nsgrp) == 0) {
+ fprintf (stderr,
+ _("%s: failed to prepare the new %s entry '%s'\n"),
+ Prog, sgr_dbname (), nsgrp->sg_name);
+ exit (E_GRP_UPDATE);
+ }
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting user from shadow group",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_SUCCESS);
+#endif /* WITH_AUDIT */
+ SYSLOG ((LOG_INFO, "delete '%s' from shadow group '%s'\n",
+ user_name, nsgrp->sg_name));
+ }
+#endif /* SHADOWGRP */
+}
+
+/*
+ * remove_usergroup - delete the user's group if it is a usergroup
+ *
+ * An usergroup is removed if
+ * + it has the same name as the user
+ * + it is the primary group of the user
+ * + it has no other members
+ * + it is not the primary group of any other user
+ */
+static void remove_usergroup (void)
+{
+ const struct group *grp;
+ const struct passwd *pwd = NULL;
+
+ grp = gr_locate (user_name);
+ if (NULL == grp) {
+ /* This user has no usergroup. */
+ return;
+ }
+
+ if (grp->gr_gid != user_gid) {
+ fprintf (stderr,
+ _("%s: group %s not removed because it is not the primary group of user %s.\n"),
+ Prog, grp->gr_name, user_name);
+ return;
+ }
+
+ if (NULL != grp->gr_mem[0]) {
+ /* The usergroup has other members. */
+ fprintf (stderr,
+ _("%s: group %s not removed because it has other members.\n"),
+ Prog, grp->gr_name);
+ return;
+ }
+
+ if (!fflg) {
+ /*
+ * Scan the passwd file to check if this group is still
+ * used as a primary group.
+ */
+ prefix_setpwent ();
+ while ((pwd = prefix_getpwent ()) != NULL) {
+ if (strcmp (pwd->pw_name, user_name) == 0) {
+ continue;
+ }
+ if (pwd->pw_gid == grp->gr_gid) {
+ fprintf (stderr,
+ _("%s: group %s is the primary group of another user and is not removed.\n"),
+ Prog, grp->gr_name);
+ break;
+ }
+ }
+ prefix_endpwent ();
+ }
+
+ if (NULL == pwd) {
+ /*
+ * We can remove this group, it is not the primary
+ * group of any remaining user.
+ */
+ if (gr_remove (user_name) == 0) {
+ fprintf (stderr,
+ _("%s: cannot remove entry '%s' from %s\n"),
+ Prog, user_name, gr_dbname ());
+ fail_exit (E_GRP_UPDATE);
+ }
+
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_GROUP, Prog,
+ "deleting group",
+ user_name, AUDIT_NO_ID,
+ SHADOW_AUDIT_SUCCESS);
+#endif /* WITH_AUDIT */
+ SYSLOG ((LOG_INFO,
+ "removed group '%s' owned by '%s'\n",
+ user_name, user_name));
+
+#ifdef SHADOWGRP
+ if (sgr_locate (user_name) != NULL) {
+ if (sgr_remove (user_name) == 0) {
+ fprintf (stderr,
+ _("%s: cannot remove entry '%s' from %s\n"),
+ Prog, user_name, sgr_dbname ());
+ fail_exit (E_GRP_UPDATE);
+ }
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_GROUP, Prog,
+ "deleting shadow group",
+ user_name, AUDIT_NO_ID,
+ SHADOW_AUDIT_SUCCESS);
+#endif /* WITH_AUDIT */
+ SYSLOG ((LOG_INFO,
+ "removed shadow group '%s' owned by '%s'\n",
+ user_name, user_name));
+
+ }
+#endif /* SHADOWGRP */
+ }
+}
+
+/*
+ * close_files - close all of the files that were opened
+ *
+ * close_files() closes all of the files that were opened for this
+ * new user. This causes any modified entries to be written out.
+ */
+static void close_files (void)
+{
+ if (pw_close () == 0) {
+ fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, pw_dbname ());
+ SYSLOG ((LOG_ERR, "failure while writing changes to %s", pw_dbname ()));
+ fail_exit (E_PW_UPDATE);
+ }
+ if (pw_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
+ /* continue */
+ }
+ pw_locked = false;
+
+ if (is_shadow_pwd) {
+ if (spw_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while writing changes to %s\n"), Prog, spw_dbname ());
+ SYSLOG ((LOG_ERR, "failure while writing changes to %s", spw_dbname ()));
+ fail_exit (E_PW_UPDATE);
+ }
+ if (spw_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", spw_dbname ()));
+ /* continue */
+ }
+ spw_locked = false;
+ }
+
+ if (gr_close () == 0) {
+ fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, gr_dbname ());
+ SYSLOG ((LOG_ERR, "failure while writing changes to %s", gr_dbname ()));
+ fail_exit (E_GRP_UPDATE);
+ }
+ 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;
+
+#ifdef SHADOWGRP
+ if (is_shadow_grp) {
+ if (sgr_close () == 0) {
+ fprintf (stderr,
+ _("%s: failure while writing changes to %s\n"), Prog, sgr_dbname ());
+ SYSLOG ((LOG_ERR, "failure while writing changes to %s", sgr_dbname ()));
+ fail_exit (E_GRP_UPDATE);
+ }
+
+ 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 /* SHADOWGRP */
+
+#ifdef ENABLE_SUBIDS
+ if (is_sub_uid) {
+ if (sub_uid_close () == 0) {
+ fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, sub_uid_dbname ());
+ SYSLOG ((LOG_ERR, "failure while writing changes to %s", sub_uid_dbname ()));
+ fail_exit (E_SUB_UID_UPDATE);
+ }
+ if (sub_uid_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_uid_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", sub_uid_dbname ()));
+ /* continue */
+ }
+ sub_uid_locked = false;
+ }
+
+ if (is_sub_gid) {
+ if (sub_gid_close () == 0) {
+ fprintf (stderr, _("%s: failure while writing changes to %s\n"), Prog, sub_gid_dbname ());
+ SYSLOG ((LOG_ERR, "failure while writing changes to %s", sub_gid_dbname ()));
+ fail_exit (E_SUB_GID_UPDATE);
+ }
+ if (sub_gid_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_gid_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", sub_gid_dbname ()));
+ /* continue */
+ }
+ sub_gid_locked = false;
+ }
+#endif /* ENABLE_SUBIDS */
+}
+
+/*
+ * fail_exit - exit with a failure code after unlocking the files
+ */
+static void fail_exit (int code)
+{
+ if (pw_locked) {
+ if (pw_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, pw_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", pw_dbname ()));
+ /* continue */
+ }
+ }
+ 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 */
+ }
+ }
+ if (spw_locked) {
+ if (spw_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, spw_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", spw_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 /* SHADOWGRP */
+#ifdef ENABLE_SUBIDS
+ if (sub_uid_locked) {
+ if (sub_uid_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_uid_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", sub_uid_dbname ()));
+ /* continue */
+ }
+ }
+ if (sub_gid_locked) {
+ if (sub_gid_unlock () == 0) {
+ fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sub_gid_dbname ());
+ SYSLOG ((LOG_ERR, "failed to unlock %s", sub_gid_dbname ()));
+ /* continue */
+ }
+ }
+#endif /* ENABLE_SUBIDS */
+
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting user",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+
+ exit (code);
+}
+
+/*
+ * open_files - lock and open the password files
+ *
+ * open_files() opens the two password files.
+ */
+
+static void open_files (void)
+{
+ if (pw_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, pw_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "locking password file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_PW_UPDATE);
+ }
+ pw_locked = true;
+ if (pw_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr,
+ _("%s: cannot open %s\n"), Prog, pw_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "opening password file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_PW_UPDATE);
+ }
+ if (is_shadow_pwd) {
+ if (spw_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, spw_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "locking shadow password file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_PW_UPDATE);
+ }
+ spw_locked = true;
+ if (spw_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr,
+ _("%s: cannot open %s\n"),
+ Prog, spw_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "opening shadow password file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_PW_UPDATE);
+ }
+ }
+ if (gr_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, gr_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "locking group file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_GRP_UPDATE);
+ }
+ gr_locked = true;
+ if (gr_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr, _("%s: cannot open %s\n"), Prog, gr_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "opening group file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_GRP_UPDATE);
+ }
+#ifdef SHADOWGRP
+ if (is_shadow_grp) {
+ if (sgr_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, sgr_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "locking shadow group file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_GRP_UPDATE);
+ }
+ sgr_locked= true;
+ if (sgr_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr, _("%s: cannot open %s\n"),
+ Prog, sgr_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "opening shadow group file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_GRP_UPDATE);
+ }
+ }
+#endif /* SHADOWGRP */
+#ifdef ENABLE_SUBIDS
+ if (is_sub_uid) {
+ if (sub_uid_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, sub_uid_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "locking subordinate user file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_SUB_UID_UPDATE);
+ }
+ sub_uid_locked = true;
+ if (sub_uid_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr,
+ _("%s: cannot open %s\n"), Prog, sub_uid_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "opening subordinate user file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_SUB_UID_UPDATE);
+ }
+ }
+ if (is_sub_gid) {
+ if (sub_gid_lock () == 0) {
+ fprintf (stderr,
+ _("%s: cannot lock %s; try again later.\n"),
+ Prog, sub_gid_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "locking subordinate group file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_SUB_GID_UPDATE);
+ }
+ sub_gid_locked = true;
+ if (sub_gid_open (O_CREAT | O_RDWR) == 0) {
+ fprintf (stderr,
+ _("%s: cannot open %s\n"), Prog, sub_gid_dbname ());
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "opening subordinate group file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_SUB_GID_UPDATE);
+ }
+ }
+#endif /* ENABLE_SUBIDS */
+}
+
+/*
+ * update_user - delete the user entries
+ *
+ * update_user() deletes the password file entries for this user
+ * and will update the group entries as required.
+ */
+static void update_user (void)
+{
+ if (pw_remove (user_name) == 0) {
+ fprintf (stderr,
+ _("%s: cannot remove entry '%s' from %s\n"),
+ Prog, user_name, pw_dbname ());
+ fail_exit (E_PW_UPDATE);
+ }
+ if ( is_shadow_pwd
+ && (spw_locate (user_name) != NULL)
+ && (spw_remove (user_name) == 0)) {
+ fprintf (stderr,
+ _("%s: cannot remove entry '%s' from %s\n"),
+ Prog, user_name, spw_dbname ());
+ fail_exit (E_PW_UPDATE);
+ }
+#ifdef ENABLE_SUBIDS
+ if (is_sub_uid && sub_uid_remove(user_name, 0, ULONG_MAX) == 0) {
+ fprintf (stderr,
+ _("%s: cannot remove entry %lu from %s\n"),
+ Prog, (unsigned long)user_id, sub_uid_dbname ());
+ fail_exit (E_SUB_UID_UPDATE);
+ }
+ if (is_sub_gid && sub_gid_remove(user_name, 0, ULONG_MAX) == 0) {
+ fprintf (stderr,
+ _("%s: cannot remove entry %lu from %s\n"),
+ Prog, (unsigned long)user_id, sub_gid_dbname ());
+ fail_exit (E_SUB_GID_UPDATE);
+ }
+#endif /* ENABLE_SUBIDS */
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting user entries",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_SUCCESS);
+#endif /* WITH_AUDIT */
+ SYSLOG ((LOG_INFO, "delete user '%s'\n", user_name));
+}
+
+/*
+ * user_cancel - cancel cron and at jobs
+ *
+ * user_cancel calls a script for additional cleanups like removal of
+ * cron, at, or print jobs.
+ */
+
+static void user_cancel (const char *user)
+{
+ const char *cmd;
+ const char *argv[3];
+ int status;
+
+ cmd = getdef_str ("USERDEL_CMD");
+ if (NULL == cmd) {
+ return;
+ }
+ argv[0] = cmd;
+ argv[1] = user;
+ argv[2] = (char *)0;
+ (void) run_command (cmd, argv, NULL, &status);
+}
+
+#ifdef EXTRA_CHECK_HOME_DIR
+static bool path_prefix (const char *s1, const char *s2)
+{
+ return ( (strncmp (s2, s1, strlen (s1)) == 0)
+ && ( ('\0' == s2[strlen (s1)])
+ || ('/' == s2[strlen (s1)])));
+}
+#endif /* EXTRA_CHECK_HOME_DIR */
+
+/*
+ * is_owner - Check if path is owned by uid
+ *
+ * Return
+ * 1: path exists and is owned by uid
+ * 0: path is not owned by uid, or a failure occurred
+ * -1: path does not exist
+ */
+static int is_owner (uid_t uid, const char *path)
+{
+ struct stat st;
+
+ errno = 0;
+ if (stat (path, &st) != 0) {
+ if ((ENOENT == errno) || (ENOTDIR == errno)) {
+ /* The file or directory does not exist */
+ return -1;
+ } else {
+ return 0;
+ }
+ }
+ return (st.st_uid == uid) ? 1 : 0;
+}
+
+static int remove_mailbox (void)
+{
+ const char *maildir;
+ char* mailfile;
+ int i;
+ int errors = 0;
+ size_t len;
+
+ maildir = getdef_str ("MAIL_DIR");
+#ifdef MAIL_SPOOL_DIR
+ if ((NULL == maildir) && (getdef_str ("MAIL_FILE") == NULL)) {
+ maildir = MAIL_SPOOL_DIR;
+ }
+#endif /* MAIL_SPOOL_DIR */
+ if (NULL == maildir) {
+ return 0;
+ }
+
+ len = strlen (prefix) + strlen (maildir) + strlen (user_name) + 2;
+ mailfile = xmalloc (len);
+
+ if (prefix[0]) {
+ (void) snprintf (mailfile, len, "%s/%s/%s",
+ prefix, maildir, user_name);
+ }
+ else {
+ (void) snprintf (mailfile, len, "%s/%s",
+ maildir, user_name);
+ }
+ mailfile[len-1] = '\0';
+
+ if (access (mailfile, F_OK) != 0) {
+ if (ENOENT == errno) {
+ fprintf (stderr,
+ _("%s: %s mail spool (%s) not found\n"),
+ Prog, user_name, mailfile);
+ free(mailfile);
+ return 0;
+ } else {
+ fprintf (stderr,
+ _("%s: warning: can't remove %s: %s\n"),
+ Prog, mailfile, strerror (errno));
+ SYSLOG ((LOG_ERR, "Cannot remove %s: %s", mailfile, strerror (errno)));
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting mail file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ free(mailfile);
+ return -1;
+ }
+ }
+
+ if (fflg) {
+ if (unlink (mailfile) != 0) {
+ fprintf (stderr,
+ _("%s: warning: can't remove %s: %s\n"),
+ Prog, mailfile, strerror (errno));
+ SYSLOG ((LOG_ERR, "Cannot remove %s: %s", mailfile, strerror (errno)));
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting mail file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ errors = 1;
+ /* continue */
+ }
+#ifdef WITH_AUDIT
+ else
+ {
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting mail file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_SUCCESS);
+ }
+#endif /* WITH_AUDIT */
+ free(mailfile);
+ return errors;
+ }
+ i = is_owner (user_id, mailfile);
+ if (i == 0) {
+ fprintf (stderr,
+ _("%s: %s not owned by %s, not removing\n"),
+ Prog, mailfile, user_name);
+ SYSLOG ((LOG_ERR,
+ "%s not owned by %s, not removed",
+ mailfile, strerror (errno)));
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting mail file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ free(mailfile);
+ return 1;
+ } else if (i == -1) {
+ free(mailfile);
+ return 0; /* mailbox doesn't exist */
+ }
+ if (unlink (mailfile) != 0) {
+ fprintf (stderr,
+ _("%s: warning: can't remove %s: %s\n"),
+ Prog, mailfile, strerror (errno));
+ SYSLOG ((LOG_ERR, "Cannot remove %s: %s", mailfile, strerror (errno)));
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting mail file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ errors = 1;
+ /* continue */
+ }
+#ifdef WITH_AUDIT
+ else
+ {
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting mail file",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_SUCCESS);
+ }
+#endif /* WITH_AUDIT */
+ free(mailfile);
+ return errors;
+}
+
+#ifdef WITH_TCB
+static int remove_tcbdir (const char *user_name, uid_t user_id)
+{
+ char *buf;
+ int ret = 0;
+ size_t buflen = (sizeof TCB_DIR) + strlen (user_name) + 2;
+
+ if (!getdef_bool ("USE_TCB")) {
+ return 0;
+ }
+
+ buf = malloc (buflen);
+ if (NULL == buf) {
+ fprintf (stderr, _("%s: Can't allocate memory, "
+ "tcb entry for %s not removed.\n"),
+ Prog, user_name);
+ return 1;
+ }
+ snprintf (buf, buflen, TCB_DIR "/%s", user_name);
+ if (shadowtcb_drop_priv () == SHADOWTCB_FAILURE) {
+ fprintf (stderr, _("%s: Cannot drop privileges: %s\n"),
+ Prog, strerror (errno));
+ shadowtcb_gain_priv ();
+ free (buf);
+ return 1;
+ }
+ /* Only remove directory contents with dropped privileges.
+ * We will regain them and remove the user's tcb directory afterwards.
+ */
+ if (remove_tree (buf, false) != 0) {
+ fprintf (stderr, _("%s: Cannot remove the content of %s: %s\n"),
+ Prog, buf, strerror (errno));
+ shadowtcb_gain_priv ();
+ free (buf);
+ return 1;
+ }
+ shadowtcb_gain_priv ();
+ free (buf);
+ if (shadowtcb_remove (user_name) == SHADOWTCB_FAILURE) {
+ fprintf (stderr, _("%s: Cannot remove tcb files for %s: %s\n"),
+ Prog, user_name, strerror (errno));
+ ret = 1;
+ }
+ return ret;
+}
+#endif /* WITH_TCB */
+
+/*
+ * main - userdel command
+ */
+int main (int argc, char **argv)
+{
+ int errors = 0; /* Error in the removal of the home directory */
+
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+ pam_handle_t *pamh = NULL;
+ int retval;
+#endif /* USE_PAM */
+#endif /* ACCT_TOOLS_SETUID */
+
+ /*
+ * 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);
+ prefix = process_prefix_flag ("-P", argc, argv);
+
+ OPENLOG ("userdel");
+#ifdef WITH_AUDIT
+ audit_help_open ();
+#endif /* WITH_AUDIT */
+
+ {
+ /*
+ * Parse the command line options.
+ */
+ int c;
+ static struct option long_options[] = {
+ {"force", no_argument, NULL, 'f'},
+ {"help", no_argument, NULL, 'h'},
+ {"remove", no_argument, NULL, 'r'},
+ {"root", required_argument, NULL, 'R'},
+ {"prefix", required_argument, NULL, 'P'},
+#ifdef WITH_SELINUX
+ {"selinux-user", no_argument, NULL, 'Z'},
+#endif /* WITH_SELINUX */
+ {NULL, 0, NULL, '\0'}
+ };
+ while ((c = getopt_long (argc, argv,
+#ifdef WITH_SELINUX
+ "fhrR:P:Z",
+#else /* !WITH_SELINUX */
+ "fhrR:P:",
+#endif /* !WITH_SELINUX */
+ long_options, NULL)) != -1) {
+ switch (c) {
+ case 'f': /* force remove even if not owned by user */
+ fflg = true;
+ break;
+ case 'h':
+ usage (E_SUCCESS);
+ break;
+ case 'r': /* remove home dir and mailbox */
+ rflg = true;
+ break;
+ case 'R': /* no-op, handled in process_root_flag () */
+ Rflg = true;
+ break;
+ case 'P': /* no-op, handled in process_prefix_flag () */
+ break;
+#ifdef WITH_SELINUX
+ case 'Z':
+ if (prefix[0]) {
+ fprintf (stderr,
+ _("%s: -Z cannot be used with --prefix\n"),
+ Prog);
+ exit (E_BAD_ARG);
+ }
+ if (is_selinux_enabled () > 0) {
+ Zflg = true;
+ } else {
+ fprintf (stderr,
+ _("%s: -Z requires SELinux enabled kernel\n"),
+ Prog);
+
+ exit (E_BAD_ARG);
+ }
+ break;
+#endif /* WITH_SELINUX */
+ default:
+ usage (E_USAGE);
+ }
+ }
+ }
+
+ if ((optind + 1) != argc) {
+ usage (E_USAGE);
+ }
+
+#ifdef ACCT_TOOLS_SETUID
+#ifdef USE_PAM
+ {
+ struct passwd *pampw;
+ pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
+ if (pampw == NULL) {
+ fprintf (stderr,
+ _("%s: Cannot determine your user name.\n"),
+ Prog);
+ exit (E_PW_UPDATE);
+ }
+
+ retval = pam_start ("userdel", pampw->pw_name, &conv, &pamh);
+ }
+
+ if (PAM_SUCCESS == retval) {
+ retval = pam_authenticate (pamh, 0);
+ }
+
+ if (PAM_SUCCESS == retval) {
+ retval = pam_acct_mgmt (pamh, 0);
+ }
+
+ if (PAM_SUCCESS != retval) {
+ fprintf (stderr, _("%s: PAM: %s\n"),
+ Prog, pam_strerror (pamh, retval));
+ SYSLOG((LOG_ERR, "%s", pam_strerror (pamh, retval)));
+ if (NULL != pamh) {
+ (void) pam_end (pamh, retval);
+ }
+ exit (E_PW_UPDATE);
+ }
+ (void) pam_end (pamh, retval);
+#endif /* USE_PAM */
+#endif /* ACCT_TOOLS_SETUID */
+
+ is_shadow_pwd = spw_file_present ();
+#ifdef SHADOWGRP
+ is_shadow_grp = sgr_file_present ();
+#endif /* SHADOWGRP */
+#ifdef ENABLE_SUBIDS
+ is_sub_uid = sub_uid_file_present ();
+ is_sub_gid = sub_gid_file_present ();
+#endif /* ENABLE_SUBIDS */
+
+ /*
+ * Start with a quick check to see if the user exists.
+ */
+ user_name = argv[argc - 1];
+ {
+ const struct passwd *pwd;
+
+ if (run_parts ("/etc/shadow-maint/userdel-pre.d", user_name,
+ "userdel")) {
+ exit(1);
+ }
+ pw_open(O_RDONLY);
+ pwd = pw_locate (user_name); /* we care only about local users */
+ if (NULL == pwd) {
+ pw_close();
+ fprintf (stderr, _("%s: user '%s' does not exist\n"),
+ Prog, user_name);
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting user not found",
+ user_name, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ exit (E_NOTFOUND);
+ }
+ user_id = pwd->pw_uid;
+ user_gid = pwd->pw_gid;
+
+ if (prefix[0]) {
+
+ size_t len = strlen(prefix) + strlen(pwd->pw_dir) + 2;
+ int wlen;
+ user_home = xmalloc(len);
+ wlen = snprintf(user_home, len, "%s/%s", prefix, pwd->pw_dir);
+ assert (wlen == (int) len -1);
+ }
+ else {
+ user_home = xstrdup (pwd->pw_dir);
+ }
+ pw_close();
+ }
+#ifdef WITH_TCB
+ if (shadowtcb_set_user (user_name) == SHADOWTCB_FAILURE) {
+ exit (E_NOTFOUND);
+ }
+#endif /* WITH_TCB */
+#ifdef USE_NIS
+
+ /*
+ * Now make sure it isn't an NIS user.
+ */
+ if (__ispwNIS ()) {
+ char *nis_domain;
+ char *nis_master;
+
+ fprintf (stderr,
+ _("%s: user %s is a NIS user\n"), Prog, user_name);
+ if ( !yp_get_default_domain (&nis_domain)
+ && !yp_master (nis_domain, "passwd.byname", &nis_master)) {
+ fprintf (stderr,
+ _("%s: %s is the NIS master\n"),
+ Prog, nis_master);
+ }
+ exit (E_NOTFOUND);
+ }
+#endif /* USE_NIS */
+ /*
+ * Check to make certain the user isn't logged in.
+ * Note: This is a best effort basis. The user may log in between,
+ * a cron job may be started on her behalf, etc.
+ */
+ if ((prefix[0] == '\0') && !Rflg && user_busy (user_name, user_id) != 0) {
+ if (!fflg) {
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting user logged in",
+ user_name, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ exit (E_USER_BUSY);
+ }
+ }
+
+ /*
+ * Do the hard stuff - open the files, create the user entries,
+ * create the home directory, then close and update the files.
+ */
+ open_files ();
+ update_user ();
+ update_groups ();
+
+ if (rflg) {
+ errors += remove_mailbox ();
+ }
+ if (rflg) {
+ int home_owned = is_owner (user_id, user_home);
+ if (-1 == home_owned) {
+ fprintf (stderr,
+ _("%s: %s home directory (%s) not found\n"),
+ Prog, user_name, user_home);
+ rflg = 0;
+ } else if ((0 == home_owned) && !fflg) {
+ fprintf (stderr,
+ _("%s: %s not owned by %s, not removing\n"),
+ Prog, user_home, user_name);
+ rflg = 0;
+ errors++;
+ /* continue */
+ }
+ }
+
+#ifdef EXTRA_CHECK_HOME_DIR
+ /* This may be slow, the above should be good enough. */
+ if (rflg && !fflg) {
+ struct passwd *pwd;
+ /*
+ * For safety, refuse to remove the home directory if it
+ * would result in removing some other user's home
+ * directory. Still not perfect so be careful, but should
+ * prevent accidents if someone has /home or / as home
+ * directory... --marekm
+ */
+ prefix_setpwent ();
+ while ((pwd = prefix_getpwent ())) {
+ if (strcmp (pwd->pw_name, user_name) == 0) {
+ continue;
+ }
+ if (path_prefix (user_home, pwd->pw_dir)) {
+ fprintf (stderr,
+ _("%s: not removing directory %s (would remove home of user %s)\n"),
+ Prog, user_home, pwd->pw_name);
+ rflg = false;
+ errors++;
+ /* continue */
+ break;
+ }
+ }
+ prefix_endpwent ();
+ }
+#endif /* EXTRA_CHECK_HOME_DIR */
+
+ if (rflg) {
+#ifdef WITH_BTRFS
+ int is_subvolume = btrfs_is_subvolume (user_home);
+ if (is_subvolume < 0) {
+ errors++;
+ /* continue */
+ }
+ else if (is_subvolume > 0) {
+ if (btrfs_remove_subvolume (user_home)) {
+ fprintf (stderr,
+ _("%s: error removing subvolume %s\n"),
+ Prog, user_home);
+ errors++;
+ /* continue */
+ }
+ }
+ else
+#endif
+ if (remove_tree (user_home, true) != 0) {
+ fprintf (stderr,
+ _("%s: error removing directory %s\n"),
+ Prog, user_home);
+ errors++;
+ /* continue */
+ }
+#ifdef WITH_AUDIT
+ else
+ {
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting home directory",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_SUCCESS);
+ }
+#endif /* WITH_AUDIT */
+ }
+#ifdef WITH_AUDIT
+ if (0 != errors) {
+ audit_logger (AUDIT_DEL_USER, Prog,
+ "deleting home directory",
+ user_name, AUDIT_NO_ID,
+ SHADOW_AUDIT_FAILURE);
+ }
+#endif /* WITH_AUDIT */
+
+#ifdef WITH_SELINUX
+ if (Zflg) {
+ if (del_seuser (user_name) != 0) {
+ fprintf (stderr,
+ _("%s: warning: the user name %s to SELinux user mapping removal failed.\n"),
+ Prog, user_name);
+#ifdef WITH_AUDIT
+ audit_logger (AUDIT_ADD_USER, Prog,
+ "removing SELinux user mapping",
+ user_name, (unsigned int) user_id,
+ SHADOW_AUDIT_FAILURE);
+#endif /* WITH_AUDIT */
+ fail_exit (E_SE_UPDATE);
+ }
+ }
+#endif /* WITH_SELINUX */
+
+ /*
+ * Cancel any crontabs or at jobs. Have to do this before we remove
+ * the entry from /etc/passwd.
+ */
+ if (prefix[0] == '\0')
+ user_cancel (user_name);
+ close_files ();
+
+ if (run_parts ("/etc/shadow-maint/userdel-post.d", user_name, "userdel")) {
+ exit(1);
+ }
+
+#ifdef WITH_TCB
+ errors += remove_tcbdir (user_name, user_id);
+#endif /* WITH_TCB */
+
+ nscd_flush_cache ("passwd");
+ nscd_flush_cache ("group");
+ sssd_flush_cache (SSSD_DB_PASSWD | SSSD_DB_GROUP);
+
+ return ((0 != errors) ? E_HOMEDIR : E_SUCCESS);
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 09:14:54 +0000