Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 632 insertions, 0 deletions

diff --git a/src/groupmems.c b/src/groupmems.c
new file mode 100644
index 0000000..a0e3266
--- /dev/null
+++ b/src/groupmems.c
@@ -0,0 +1,632 @@
+/*
+ * SPDX-FileCopyrightText: 2000       , International Business Machines
+ * SPDX-FileCopyrightText: 2000       , George Kraft IV, gk4@us.ibm.com, 03/23/2000
+ * SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#include <fcntl.h>
+#include <getopt.h>
+#include <grp.h>
+#include <stdio.h>
+#include <sys/types.h>
+#ifdef USE_PAM
+#include "pam_defs.h"
+#endif				/* USE_PAM */
+#include <pwd.h>
+#include "defines.h"
+#include "prototypes.h"
+#include "groupio.h"
+#ifdef SHADOWGRP
+#include "sgroupio.h"
+#endif
+#include "shadowlog.h"
+
+/* Exit Status Values */
+/*@-exitarg@*/
+#define EXIT_SUCCESS		0	/* success */
+#define EXIT_USAGE		1	/* invalid command syntax */
+#define EXIT_GROUP_FILE		2	/* group file access problems */
+#define EXIT_NOT_ROOT		3	/* not superuser  */
+#define EXIT_NOT_EROOT		4	/* not effective superuser  */
+#define EXIT_NOT_PRIMARY	5	/* not primary owner of group  */
+#define EXIT_NOT_MEMBER		6	/* member of group does not exist */
+#define EXIT_MEMBER_EXISTS	7	/* member of group already exists */
+#define EXIT_INVALID_USER	8	/* specified user does not exist */
+#define EXIT_INVALID_GROUP	9	/* specified group does not exist */
+
+/*
+ * Global variables
+ */
+const char *Prog;
+
+static char *adduser = NULL;
+static char *deluser = NULL;
+static char *thisgroup = NULL;
+static bool purge = false;
+static bool list = false;
+static int exclusive = 0;
+static bool gr_locked = false;
+#ifdef SHADOWGRP
+/* Indicate if shadow groups are enabled on the system
+ * (/etc/gshadow present) */
+static bool is_shadowgrp;
+static bool sgr_locked = false;
+#endif
+
+/* local function prototypes */
+static char *whoami (void);
+static void add_user (const char *user,
+                      const struct group *grp);
+static void remove_user (const char *user,
+                         const struct group *grp);
+static void purge_members (const struct group *grp);
+static void display_members (const char *const *members);
+static /*@noreturn@*/void usage (int status);
+static void process_flags (int argc, char **argv);
+static void check_perms (void);
+static void fail_exit (int code);
+#define isroot()		(getuid () == 0)
+
+static char *whoami (void)
+{
+	/* local, no need for xgetgrgid */
+	struct group *grp = getgrgid (getgid ());
+	/* local, no need for xgetpwuid */
+	struct passwd *usr = getpwuid (getuid ());
+
+	if (   (NULL != usr)
+	    && (NULL != grp)
+	    && (0 == strcmp (usr->pw_name, grp->gr_name))) {
+		return xstrdup (usr->pw_name);
+	} else {
+		return NULL;
+	}
+}
+
+/*
+ * add_user - Add an user to the specified group
+ */
+static void add_user (const char *user,
+                      const struct group *grp)
+{
+	struct group *newgrp;
+
+	/* Make sure the user is not already part of the group */
+	if (is_on_list (grp->gr_mem, user)) {
+		fprintf (stderr,
+		         _("%s: user '%s' is already a member of '%s'\n"),
+		         Prog, user, grp->gr_name);
+		fail_exit (EXIT_MEMBER_EXISTS);
+	}
+
+	newgrp = __gr_dup(grp);
+	if (NULL == newgrp) {
+		fprintf (stderr,
+		         _("%s: Out of memory. Cannot update %s.\n"),
+		         Prog, gr_dbname ());
+		fail_exit (13);
+	}
+
+	/* Add the user to the /etc/group group */
+	newgrp->gr_mem = add_list (newgrp->gr_mem, user);
+
+#ifdef SHADOWGRP
+	if (is_shadowgrp) {
+		const struct sgrp *sg = sgr_locate (newgrp->gr_name);
+		struct sgrp *newsg;
+
+		if (NULL == sg) {
+			/* Create a shadow group based on this group */
+			static struct sgrp sgrent;
+			sgrent.sg_name = xstrdup (newgrp->gr_name);
+			sgrent.sg_mem = dup_list (newgrp->gr_mem);
+			sgrent.sg_adm = (char **) xmalloc (sizeof (char *));
+#ifdef FIRST_MEMBER_IS_ADMIN
+			if (sgrent.sg_mem[0]) {
+				sgrent.sg_adm[0] = xstrdup (sgrent.sg_mem[0]);
+				sgrent.sg_adm[1] = NULL;
+			} else
+#endif
+			{
+				sgrent.sg_adm[0] = NULL;
+			}
+
+			/* Move any password to gshadow */
+			sgrent.sg_passwd = newgrp->gr_passwd;
+			newgrp->gr_passwd = SHADOW_PASSWD_STRING;
+
+			newsg = &sgrent;
+		} else {
+			newsg = __sgr_dup (sg);
+			if (NULL == newsg) {
+				fprintf (stderr,
+				         _("%s: Out of memory. Cannot update %s.\n"),
+				         Prog, sgr_dbname ());
+				fail_exit (13);
+			}
+			/* Add the user to the members */
+			newsg->sg_mem = add_list (newsg->sg_mem, user);
+			/* Do not touch the administrators */
+		}
+
+		if (sgr_update (newsg) == 0) {
+			fprintf (stderr,
+			         _("%s: failed to prepare the new %s entry '%s'\n"),
+			         Prog, sgr_dbname (), newsg->sg_name);
+			fail_exit (13);
+		}
+	}
+#endif
+
+	if (gr_update (newgrp) == 0) {
+		fprintf (stderr,
+		         _("%s: failed to prepare the new %s entry '%s'\n"),
+		         Prog, gr_dbname (), newgrp->gr_name);
+		fail_exit (13);
+	}
+}
+
+/*
+ * remove_user - Remove an user from a given group
+ */
+static void remove_user (const char *user,
+                         const struct group *grp)
+{
+	struct group *newgrp;
+
+	/* Check if the user is a member of the specified group */
+	if (!is_on_list (grp->gr_mem, user)) {
+		fprintf (stderr,
+		         _("%s: user '%s' is not a member of '%s'\n"),
+		         Prog, user, grp->gr_name);
+		fail_exit (EXIT_NOT_MEMBER);
+	}
+
+	newgrp = __gr_dup (grp);
+	if (NULL == newgrp) {
+		fprintf (stderr,
+		         _("%s: Out of memory. Cannot update %s.\n"),
+		         Prog, gr_dbname ());
+		fail_exit (13);
+	}
+
+	/* Remove the user from the /etc/group group */
+	newgrp->gr_mem = del_list (newgrp->gr_mem, user);
+
+#ifdef SHADOWGRP
+	if (is_shadowgrp) {
+		const struct sgrp *sg = sgr_locate (newgrp->gr_name);
+		struct sgrp *newsg;
+
+		if (NULL == sg) {
+			/* Create a shadow group based on this group */
+			static struct sgrp sgrent;
+			sgrent.sg_name = xstrdup (newgrp->gr_name);
+			sgrent.sg_mem = dup_list (newgrp->gr_mem);
+			sgrent.sg_adm = (char **) xmalloc (sizeof (char *));
+#ifdef FIRST_MEMBER_IS_ADMIN
+			if (sgrent.sg_mem[0]) {
+				sgrent.sg_adm[0] = xstrdup (sgrent.sg_mem[0]);
+				sgrent.sg_adm[1] = NULL;
+			} else
+#endif
+			{
+				sgrent.sg_adm[0] = NULL;
+			}
+
+			/* Move any password to gshadow */
+			sgrent.sg_passwd = newgrp->gr_passwd;
+			newgrp->gr_passwd = SHADOW_PASSWD_STRING;
+
+			newsg = &sgrent;
+		} else {
+			newsg = __sgr_dup (sg);
+			if (NULL == newsg) {
+				fprintf (stderr,
+				         _("%s: Out of memory. Cannot update %s.\n"),
+				         Prog, sgr_dbname ());
+				fail_exit (13);
+			}
+			/* Remove the user from the members */
+			newsg->sg_mem = del_list (newsg->sg_mem, user);
+			/* Remove the user from the administrators */
+			newsg->sg_adm = del_list (newsg->sg_adm, user);
+		}
+
+		if (sgr_update (newsg) == 0) {
+			fprintf (stderr,
+			         _("%s: failed to prepare the new %s entry '%s'\n"),
+			         Prog, sgr_dbname (), newsg->sg_name);
+			fail_exit (13);
+		}
+	}
+#endif
+
+	if (gr_update (newgrp) == 0) {
+		fprintf (stderr,
+		         _("%s: failed to prepare the new %s entry '%s'\n"),
+		         Prog, gr_dbname (), newgrp->gr_name);
+		fail_exit (13);
+	}
+}
+
+/*
+ * purge_members - Remove every members of the specified group
+ */
+static void purge_members (const struct group *grp)
+{
+	struct group *newgrp = __gr_dup (grp);
+
+	if (NULL == newgrp) {
+		fprintf (stderr,
+		         _("%s: Out of memory. Cannot update %s.\n"),
+		         Prog, gr_dbname ());
+		fail_exit (13);
+	}
+
+	/* Remove all the members of the /etc/group group */
+	newgrp->gr_mem[0] = NULL;
+
+#ifdef SHADOWGRP
+	if (is_shadowgrp) {
+		const struct sgrp *sg = sgr_locate (newgrp->gr_name);
+		struct sgrp *newsg;
+
+		if (NULL == sg) {
+			/* Create a shadow group based on this group */
+			static struct sgrp sgrent;
+			sgrent.sg_name = xstrdup (newgrp->gr_name);
+			sgrent.sg_mem = (char **) xmalloc (sizeof (char *));
+			sgrent.sg_mem[0] = NULL;
+			sgrent.sg_adm = (char **) xmalloc (sizeof (char *));
+			sgrent.sg_adm[0] = NULL;
+
+			/* Move any password to gshadow */
+			sgrent.sg_passwd = newgrp->gr_passwd;
+			newgrp->gr_passwd = xstrdup(SHADOW_PASSWD_STRING);
+
+			newsg = &sgrent;
+		} else {
+			newsg = __sgr_dup (sg);
+			if (NULL == newsg) {
+				fprintf (stderr,
+				         _("%s: Out of memory. Cannot update %s.\n"),
+				         Prog, sgr_dbname ());
+				fail_exit (13);
+			}
+			/* Remove all the members of the /etc/gshadow
+			 * group */
+			newsg->sg_mem[0] = NULL;
+			/* Remove all the administrators of the
+			 * /etc/gshadow group */
+			newsg->sg_adm[0] = NULL;
+		}
+
+		if (sgr_update (newsg) == 0) {
+			fprintf (stderr,
+			         _("%s: failed to prepare the new %s entry '%s'\n"),
+			         Prog, sgr_dbname (), newsg->sg_name);
+			fail_exit (13);
+		}
+	}
+#endif
+
+	if (gr_update (newgrp) == 0) {
+		fprintf (stderr,
+		         _("%s: failed to prepare the new %s entry '%s'\n"),
+		         Prog, gr_dbname (), newgrp->gr_name);
+		fail_exit (13);
+	}
+}
+
+static void display_members (const char *const *members)
+{
+	int i;
+
+	for (i = 0; NULL != members[i]; i++) {
+		printf ("%s ", members[i]);
+
+		if (NULL == members[i + 1]) {
+			printf ("\n");
+		} else {
+			printf (" ");
+		}
+	}
+}
+
+static /*@noreturn@*/void usage (int status)
+{
+	FILE *usageout = (EXIT_SUCCESS != status) ? stderr : stdout;
+	(void) fprintf (usageout,
+	                _("Usage: %s [options] [action]\n"
+	                  "\n"
+	                  "Options:\n"),
+	                Prog);
+	(void) fputs (_("  -g, --group groupname         change groupname instead of the user's group\n"
+	                "                                (root only)\n"), usageout);
+	(void) fputs (_("  -R, --root CHROOT_DIR         directory to chroot into\n"), usageout);
+	(void) fputs (_("\n"), usageout);
+	(void) fputs (_("Actions:\n"), usageout);
+	(void) fputs (_("  -a, --add username            add username to the members of the group\n"), usageout);
+	(void) fputs (_("  -d, --delete username         remove username from the members of the group\n"), usageout);
+	(void) fputs (_("  -h, --help                    display this help message and exit\n"), usageout);
+	(void) fputs (_("  -p, --purge                   purge all members from the group\n"), usageout);
+	(void) fputs (_("  -l, --list                    list the members of the group\n"), usageout);
+	exit (status);
+}
+
+/*
+ * process_flags - perform command line argument setting
+ */
+static void process_flags (int argc, char **argv)
+{
+	int c;
+	static struct option long_options[] = {
+		{"add",    required_argument, NULL, 'a'},
+		{"delete", required_argument, NULL, 'd'},
+		{"group",  required_argument, NULL, 'g'},
+		{"help",   no_argument,       NULL, 'h'},
+		{"list",   no_argument,       NULL, 'l'},
+		{"purge",  no_argument,       NULL, 'p'},
+		{"root",   required_argument, NULL, 'R'},
+		{NULL, 0, NULL, '\0'}
+	};
+
+	while ((c = getopt_long (argc, argv, "a:d:g:hlpR:",
+	                         long_options, NULL)) != EOF) {
+		switch (c) {
+		case 'a':
+			adduser = xstrdup (optarg);
+			++exclusive;
+			break;
+		case 'd':
+			deluser = xstrdup (optarg);
+			++exclusive;
+			break;
+		case 'g':
+			thisgroup = xstrdup (optarg);
+			break;
+		case 'h':
+			usage (EXIT_SUCCESS);
+			/*@notreached@*/break;
+		case 'l':
+			list = true;
+			++exclusive;
+			break;
+		case 'p':
+			purge = true;
+			++exclusive;
+			break;
+		case 'R': /* no-op, handled in process_root_flag () */
+			break;
+		default:
+			usage (EXIT_USAGE);
+		}
+	}
+
+	if ((exclusive > 1) || (optind < argc)) {
+		usage (EXIT_USAGE);
+	}
+
+	/* local, no need for xgetpwnam */
+	if (   (NULL != adduser)
+	    && (getpwnam (adduser) == NULL)) {
+		fprintf (stderr, _("%s: user '%s' does not exist\n"),
+		         Prog, adduser);
+		fail_exit (EXIT_INVALID_USER);
+	}
+
+}
+
+static void check_perms (void)
+{
+	if (!list) {
+#ifdef USE_PAM
+		pam_handle_t *pamh = NULL;
+		int retval;
+		struct passwd *pampw;
+
+		pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
+		if (NULL == pampw) {
+			fprintf (stderr,
+			         _("%s: Cannot determine your user name.\n"),
+			         Prog);
+			fail_exit (1);
+		}
+
+		retval = pam_start ("groupmems", 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);
+			}
+			fail_exit (1);
+		}
+		(void) pam_end (pamh, retval);
+#endif
+	}
+}
+
+static void fail_exit (int code)
+{
+	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
+
+	exit (code);
+}
+
+static void open_files (void)
+{
+	if (!list) {
+		if (gr_lock () == 0) {
+			fprintf (stderr,
+			         _("%s: cannot lock %s; try again later.\n"),
+			         Prog, gr_dbname ());
+			fail_exit (EXIT_GROUP_FILE);
+		}
+		gr_locked = true;
+
+#ifdef SHADOWGRP
+		if (is_shadowgrp) {
+			if (sgr_lock () == 0) {
+				fprintf (stderr,
+				         _("%s: cannot lock %s; try again later.\n"),
+				         Prog, sgr_dbname ());
+				fail_exit (EXIT_GROUP_FILE);
+			}
+			sgr_locked = true;
+		}
+#endif
+	}
+
+	if (gr_open (list ? O_RDONLY : O_CREAT | O_RDWR) == 0) {
+		fprintf (stderr, _("%s: cannot open %s\n"), Prog, gr_dbname ());
+		fail_exit (EXIT_GROUP_FILE);
+	}
+
+#ifdef SHADOWGRP
+	if (is_shadowgrp) {
+		if (sgr_open (list ? O_RDONLY : O_CREAT | O_RDWR) == 0) {
+			fprintf (stderr, _("%s: cannot open %s\n"), Prog, sgr_dbname ());
+			fail_exit (EXIT_GROUP_FILE);
+		}
+	}
+#endif
+}
+
+static void close_files (void)
+{
+	if ((gr_close () == 0) && !list) {
+		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 (EXIT_GROUP_FILE);
+	}
+	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;
+	}
+
+#ifdef SHADOWGRP
+	if (is_shadowgrp) {
+		if ((sgr_close () == 0) && !list) {
+			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 (EXIT_GROUP_FILE);
+		}
+		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
+}
+
+int main (int argc, char **argv)
+{
+	char *name;
+	const struct group *grp;
+
+	/*
+	 * 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 ("groupmems");
+
+#ifdef SHADOWGRP
+	is_shadowgrp = sgr_file_present ();
+#endif
+
+	process_flags (argc, argv);
+
+	if (NULL == thisgroup) {
+		name = whoami ();
+		if (!list && (NULL == name)) {
+			fprintf (stderr, _("%s: your groupname does not match your username\n"), Prog);
+			fail_exit (EXIT_NOT_PRIMARY);
+		}
+	} else {
+		name = thisgroup;
+		if (!list && !isroot ()) {
+			fprintf (stderr, _("%s: only root can use the -g/--group option\n"), Prog);
+			fail_exit (EXIT_NOT_ROOT);
+		}
+	}
+
+	check_perms ();
+
+	open_files ();
+
+	grp = gr_locate (name);
+	if (NULL == grp) {
+		fprintf (stderr, _("%s: group '%s' does not exist in %s\n"),
+		         Prog, name, gr_dbname ());
+		fail_exit (EXIT_INVALID_GROUP);
+	}
+
+	if (list) {
+		display_members ((const char *const *)grp->gr_mem);
+	} else if (NULL != adduser) {
+		add_user (adduser, grp);
+	} else if (NULL != deluser) {
+		remove_user (deluser, grp);
+	} else if (purge) {
+		purge_members (grp);
+	}
+
+	close_files ();
+
+	exit (EXIT_SUCCESS);
+}
+