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, 735 insertions, 0 deletions

diff --git a/src/chfn.c b/src/chfn.c
new file mode 100644
index 0000000..1c2f1cc
--- /dev/null
+++ b/src/chfn.c
@@ -0,0 +1,735 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <fcntl.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <getopt.h>
+#include "defines.h"
+#include "getdef.h"
+#include "nscd.h"
+#include "sssd.h"
+#ifdef USE_PAM
+#include "pam_defs.h"
+#endif
+#include "prototypes.h"
+#include "pwauth.h"
+#include "pwio.h"
+/*@-exitarg@*/
+#include "exitcodes.h"
+#include "shadowlog.h"
+
+/*
+ * Global variables.
+ */
+const char *Prog;
+static char fullnm[BUFSIZ];
+static char roomno[BUFSIZ];
+static char workph[BUFSIZ];
+static char homeph[BUFSIZ];
+static char slop[BUFSIZ + 1 + 80];
+static bool amroot;
+/* Flags */
+static bool fflg = false;		/* -f - set full name                */
+static bool rflg = false;		/* -r - set room number              */
+static bool wflg = false;		/* -w - set work phone number        */
+static bool hflg = false;		/* -h - set home phone number        */
+static bool oflg = false;		/* -o - set other information        */
+static bool pw_locked = false;
+
+/*
+ * External identifiers
+ */
+
+/* local function prototypes */
+static void fail_exit (int code);
+static /*@noreturn@*/void usage (int status);
+static bool may_change_field (int);
+static void new_fields (void);
+static char *copy_field (char *, char *, char *);
+static void process_flags (int argc, char **argv);
+static void check_perms (const struct passwd *pw);
+static void update_gecos (const char *user, char *gecos);
+static void get_old_fields (const char *gecos);
+
+/*
+ * fail_exit - exit with an error and do some cleanup
+ */
+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 */
+		}
+	}
+	pw_locked = false;
+
+	closelog ();
+
+	exit (code);
+}
+
+/*
+ * usage - print command line syntax and exit
+ */
+static /*@noreturn@*/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, --full-name FULL_NAME     change user's full name\n"), usageout);
+	(void) fputs (_("  -h, --home-phone HOME_PHONE   change user's home phone number\n"), usageout);
+	(void) fputs (_("  -o, --other OTHER_INFO        change user's other GECOS information\n"), usageout);
+	(void) fputs (_("  -r, --room ROOM_NUMBER        change user's room number\n"), usageout);
+	(void) fputs (_("  -R, --root CHROOT_DIR         directory to chroot into\n"), usageout);
+	(void) fputs (_("  -u, --help                    display this help message and exit\n"), usageout);
+	(void) fputs (_("  -w, --work-phone WORK_PHONE   change user's office phone number\n"), usageout);
+	(void) fputs ("\n", usageout);
+	exit (status);
+}
+
+/*
+ * may_change_field - indicate if the user is allowed to change a given field
+ *                    of her gecos information
+ *
+ *	root can change any field.
+ *
+ *	field should be one of 'f', 'r', 'w', 'h'
+ *
+ *	Return true if the user can change the field and false otherwise.
+ */
+static bool may_change_field (int field)
+{
+	const char *cp;
+
+	/*
+	 * CHFN_RESTRICT can now specify exactly which fields may be changed
+	 * by regular users, by using any combination of the following
+	 * letters:
+	 *  f - full name
+	 *  r - room number
+	 *  w - work phone
+	 *  h - home phone
+	 *
+	 * This makes it possible to disallow changing the room number
+	 * information, for example - this feature was suggested by Maciej
+	 * 'Tycoon' Majchrowski.
+	 *
+	 * For backward compatibility, "yes" is equivalent to "rwh",
+	 * "no" is equivalent to "frwh". Only root can change anything
+	 * if the string is empty or not defined at all.
+	 */
+	if (amroot) {
+		return true;
+	}
+
+	cp = getdef_str ("CHFN_RESTRICT");
+	if (NULL == cp) {
+		cp = "";
+	} else if (strcmp (cp, "yes") == 0) {
+		cp = "rwh";
+	} else if (strcmp (cp, "no") == 0) {
+		cp = "frwh";
+	}
+
+	if (strchr (cp, field) != NULL) {
+		return true;
+	}
+
+	return false;
+}
+
+/*
+ * new_fields - change the user's GECOS information interactively
+ *
+ * prompt the user for each of the four fields and fill in the fields from
+ * the user's response, or leave alone if nothing was entered.
+ */
+static void new_fields (void)
+{
+	puts (_("Enter the new value, or press ENTER for the default"));
+
+	if (may_change_field ('f')) {
+		change_field (fullnm, sizeof fullnm, _("Full Name"));
+	} else {
+		printf (_("\t%s: %s\n"), _("Full Name"), fullnm);
+	}
+
+	if (may_change_field ('r')) {
+		change_field (roomno, sizeof roomno, _("Room Number"));
+	} else {
+		printf (_("\t%s: %s\n"), _("Room Number"), fullnm);
+	}
+
+	if (may_change_field ('w')) {
+		change_field (workph, sizeof workph, _("Work Phone"));
+	} else {
+		printf (_("\t%s: %s\n"), _("Work Phone"), fullnm);
+	}
+
+	if (may_change_field ('h')) {
+		change_field (homeph, sizeof homeph, _("Home Phone"));
+	} else {
+		printf (_("\t%s: %s\n"), _("Home Phone"), fullnm);
+	}
+
+	if (amroot) {
+		change_field (slop, sizeof slop, _("Other"));
+	}
+}
+
+/*
+ * copy_field - get the next field from the gecos field
+ *
+ * copy_field copies the next field from the gecos field, returning a
+ * pointer to the field which follows, or NULL if there are no more fields.
+ *
+ *	in - the current GECOS field
+ *	out - where to copy the field to
+ *	extra - fields with '=' get copied here
+ */
+static char *copy_field (char *in, char *out, char *extra)
+{
+	char *cp = NULL;
+
+	while (NULL != in) {
+		cp = strchr (in, ',');
+		if (NULL != cp) {
+			*cp++ = '\0';
+		}
+
+		if (strchr (in, '=') == NULL) {
+			break;
+		}
+
+		if (NULL != extra) {
+			if ('\0' != extra[0]) {
+				strcat (extra, ",");
+			}
+
+			strcat (extra, in);
+		}
+		in = cp;
+	}
+	if ((NULL != in) && (NULL != out)) {
+		strcpy (out, in);
+	}
+
+	return cp;
+}
+
+/*
+ * 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;		/* flag currently being processed    */
+	static struct option long_options[] = {
+		{"full-name",  required_argument, NULL, 'f'},
+		{"home-phone", required_argument, NULL, 'h'},
+		{"other",      required_argument, NULL, 'o'},
+		{"room",       required_argument, NULL, 'r'},
+		{"root",       required_argument, NULL, 'R'},
+		{"help",       no_argument,       NULL, 'u'},
+		{"work-phone", required_argument, NULL, 'w'},
+		{NULL, 0, NULL, '\0'}
+	};
+
+	/*
+	 * The remaining arguments will be processed one by one and executed
+	 * by this command. The name is the last argument if it does not
+	 * begin with a "-", otherwise the name is determined from the
+	 * environment and must agree with the real UID. Also, the UID will
+	 * be checked for any commands which are restricted to root only.
+	 */
+	while ((c = getopt_long (argc, argv, "f:h:o:r:R:uw:",
+	                         long_options, NULL)) != -1) {
+		switch (c) {
+		case 'f':
+			if (!may_change_field ('f')) {
+				fprintf (stderr,
+				         _("%s: Permission denied.\n"), Prog);
+				exit (E_NOPERM);
+			}
+			fflg = true;
+			STRFCPY (fullnm, optarg);
+			break;
+		case 'h':
+			if (!may_change_field ('h')) {
+				fprintf (stderr,
+				         _("%s: Permission denied.\n"), Prog);
+				exit (E_NOPERM);
+			}
+			hflg = true;
+			STRFCPY (homeph, optarg);
+			break;
+		case 'o':
+			if (!amroot) {
+				fprintf (stderr,
+				         _("%s: Permission denied.\n"), Prog);
+				exit (E_NOPERM);
+			}
+			oflg = true;
+			if (strlen (optarg) > (unsigned int) 80) {
+				fprintf (stderr,
+				         _("%s: fields too long\n"), Prog);
+				exit (E_NOPERM);
+			}
+			STRFCPY (slop, optarg);
+			break;
+		case 'r':
+			if (!may_change_field ('r')) {
+				fprintf (stderr,
+				         _("%s: Permission denied.\n"), Prog);
+				exit (E_NOPERM);
+			}
+			rflg = true;
+			STRFCPY (roomno, optarg);
+			break;
+		case 'R': /* no-op, handled in process_root_flag () */
+			break;
+		case 'u':
+			usage (E_SUCCESS);
+			/*@notreached@*/break;
+		case 'w':
+			if (!may_change_field ('w')) {
+				fprintf (stderr,
+				         _("%s: Permission denied.\n"), Prog);
+				exit (E_NOPERM);
+			}
+			wflg = true;
+			STRFCPY (workph, optarg);
+			break;
+		default:
+			usage (E_USAGE);
+		}
+	}
+}
+
+/*
+ * check_perms - check if the caller is allowed to add a group
+ *
+ *	Non-root users are only allowed to change their gecos field.
+ *	(see also may_change_field())
+ *
+ *	Non-root users must be authenticated.
+ *
+ *	It will not return if the user is not allowed.
+ */
+static void check_perms (const struct passwd *pw)
+{
+#ifdef USE_PAM
+	pam_handle_t *pamh = NULL;
+	int retval;
+	struct passwd *pampw;
+#endif
+
+	/*
+	 * Non-privileged users are only allowed to change the gecos field
+	 * if the UID of the user matches the current real UID.
+	 */
+	if (!amroot && pw->pw_uid != getuid ()) {
+		fprintf (stderr, _("%s: Permission denied.\n"), Prog);
+		closelog ();
+		exit (E_NOPERM);
+	}
+#ifdef WITH_SELINUX
+	/*
+	 * If the UID of the user does not match the current real UID,
+	 * check if the change is allowed by SELinux policy.
+	 */
+	if ((pw->pw_uid != getuid ())
+	    && (check_selinux_permit ("chfn") != 0)) {
+		fprintf (stderr, _("%s: Permission denied.\n"), Prog);
+		closelog ();
+		exit (E_NOPERM);
+	}
+#endif
+
+#ifndef USE_PAM
+	/*
+	 * Non-privileged users are optionally authenticated (must enter the
+	 * password of the user whose information is being changed) before
+	 * any changes can be made. Idea from util-linux chfn/chsh.
+	 * --marekm
+	 */
+	if (!amroot && getdef_bool ("CHFN_AUTH")) {
+		passwd_check (pw->pw_name, pw->pw_passwd, "chfn");
+	}
+
+#else				/* !USE_PAM */
+	pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
+	if (NULL == pampw) {
+		fprintf (stderr,
+		         _("%s: Cannot determine your user name.\n"),
+		         Prog);
+		exit (E_NOPERM);
+	}
+
+	retval = pam_start ("chfn", 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_NOPERM);
+	}
+	(void) pam_end (pamh, retval);
+#endif				/* USE_PAM */
+}
+
+/*
+ * update_gecos - update the gecos fields in the password database
+ *
+ *	Commit the user's entry after changing her gecos field.
+ */
+static void update_gecos (const char *user, char *gecos)
+{
+	const struct passwd *pw;	/* The user's password file entry */
+	struct passwd pwent;		/* modified password file entry */
+
+	/*
+	 * Before going any further, raise the ulimit to prevent colliding
+	 * into a lowered ulimit, and set the real UID to root to protect
+	 * against unexpected signals. Any keyboard signals are set to be
+	 * ignored.
+	 */
+	if (setuid (0) != 0) {
+		fputs (_("Cannot change ID to root.\n"), stderr);
+		SYSLOG ((LOG_ERR, "can't setuid(0)"));
+		fail_exit (E_NOPERM);
+	}
+	pwd_init ();
+
+	/*
+	 * The passwd entry is now ready to be committed back to the
+	 * password file. Get a lock on the file and open it.
+	 */
+	if (pw_lock () == 0) {
+		fprintf (stderr,
+		         _("%s: cannot lock %s; try again later.\n"),
+		         Prog, pw_dbname ());
+		fail_exit (E_NOPERM);
+	}
+	pw_locked = true;
+	if (pw_open (O_CREAT | O_RDWR) == 0) {
+		fprintf (stderr,
+		         _("%s: cannot open %s\n"), Prog, pw_dbname ());
+		fail_exit (E_NOPERM);
+	}
+
+	/*
+	 * Get the entry to update using pw_locate() - we want the real one
+	 * from /etc/passwd, not the one from getpwnam() which could contain
+	 * the shadow password if (despite the warnings) someone enables
+	 * AUTOSHADOW (or SHADOW_COMPAT in libc).  --marekm
+	 */
+	pw = pw_locate (user);
+	if (NULL == pw) {
+		fprintf (stderr,
+		         _("%s: user '%s' does not exist in %s\n"),
+		         Prog, user, pw_dbname ());
+		fail_exit (E_NOPERM);
+	}
+
+	/*
+	 * Make a copy of the entry, then change the gecos field. The other
+	 * fields remain unchanged.
+	 */
+	pwent = *pw;
+	pwent.pw_gecos = gecos;
+
+	/*
+	 * Update the passwd file entry. If there is a DBM file, update that
+	 * entry as well.
+	 */
+	if (pw_update (&pwent) == 0) {
+		fprintf (stderr,
+		         _("%s: failed to prepare the new %s entry '%s'\n"),
+		         Prog, pw_dbname (), pwent.pw_name);
+		fail_exit (E_NOPERM);
+	}
+
+	/*
+	 * Changes have all been made, so commit them and unlock the file.
+	 */
+	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_NOPERM);
+	}
+	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;
+}
+
+/*
+ * get_old_fields - parse the old gecos and use the old value for the fields
+ *                  which are not set on the command line
+ */
+static void get_old_fields (const char *gecos)
+{
+	char *cp;		/* temporary character pointer       */
+	char old_gecos[BUFSIZ];	/* buffer for old GECOS fields       */
+	STRFCPY (old_gecos, gecos);
+
+	/*
+	 * Now get the full name. It is the first comma separated field in
+	 * the GECOS field.
+	 */
+	cp = copy_field (old_gecos, fflg ? (char *) 0 : fullnm, slop);
+
+	/*
+	 * Now get the room number. It is the next comma separated field,
+	 * if there is indeed one.
+	 */
+	if (NULL != cp) {
+		cp = copy_field (cp, rflg ? (char *) 0 : roomno, slop);
+	}
+
+	/*
+	 * Now get the work phone number. It is the third field.
+	 */
+	if (NULL != cp) {
+		cp = copy_field (cp, wflg ? (char *) 0 : workph, slop);
+	}
+
+	/*
+	 * Now get the home phone number. It is the fourth field.
+	 */
+	if (NULL != cp) {
+		cp = copy_field (cp, hflg ? (char *) 0 : homeph, slop);
+	}
+
+	/*
+	 * Anything left over is "slop".
+	 */
+	if ((NULL != cp) && !oflg) {
+		if ('\0' != slop[0]) {
+			strcat (slop, ",");
+		}
+
+		strcat (slop, cp);
+	}
+}
+
+/*
+ * check_fields - check all of the fields for valid information
+ *
+ *	It will not return if a field is not valid.
+ */
+static void check_fields (void)
+{
+	int err;
+	err = valid_field (fullnm, ":,=\n");
+	if (err > 0) {
+		fprintf (stderr, _("%s: name with non-ASCII characters: '%s'\n"), Prog, fullnm);
+	} else if (err < 0) {
+		fprintf (stderr, _("%s: invalid name: '%s'\n"), Prog, fullnm);
+		fail_exit (E_NOPERM);
+	}
+	err = valid_field (roomno, ":,=\n");
+	if (err > 0) {
+		fprintf (stderr, _("%s: room number with non-ASCII characters: '%s'\n"), Prog, roomno);
+	} else if (err < 0) {
+		fprintf (stderr, _("%s: invalid room number: '%s'\n"),
+		         Prog, roomno);
+		fail_exit (E_NOPERM);
+	}
+	if (valid_field (workph, ":,=\n") != 0) {
+		fprintf (stderr, _("%s: invalid work phone: '%s'\n"),
+		         Prog, workph);
+		fail_exit (E_NOPERM);
+	}
+	if (valid_field (homeph, ":,=\n") != 0) {
+		fprintf (stderr, _("%s: invalid home phone: '%s'\n"),
+		         Prog, homeph);
+		fail_exit (E_NOPERM);
+	}
+	err = valid_field (slop, ":\n");
+	if (err > 0) {
+		fprintf (stderr, _("%s: '%s' contains non-ASCII characters\n"), Prog, slop);
+	} else if (err < 0) {
+		fprintf (stderr,
+		         _("%s: '%s' contains illegal characters\n"),
+		         Prog, slop);
+		fail_exit (E_NOPERM);
+	}
+}
+
+/*
+ * chfn - change a user's password file information
+ *
+ *	This command controls the GECOS field information in the password
+ *	file entry.
+ *
+ *	The valid options are
+ *
+ *	-f	full name
+ *	-r	room number
+ *	-w	work phone number
+ *	-h	home phone number
+ *	-o	other information (*)
+ *
+ *	(*) requires root permission to execute.
+ */
+int main (int argc, char **argv)
+{
+	const struct passwd *pw;	/* password file entry               */
+	char new_gecos[BUFSIZ];	/* buffer for new GECOS fields       */
+	char *user;
+
+	/*
+	 * Get the program name. The program name is used as a
+	 * prefix to most error messages.
+	 */
+	Prog = Basename (argv[0]);
+	log_set_progname(Prog);
+	log_set_logfd(stderr);
+
+	sanitize_env ();
+	(void) setlocale (LC_ALL, "");
+	(void) bindtextdomain (PACKAGE, LOCALEDIR);
+	(void) textdomain (PACKAGE);
+
+	process_root_flag ("-R", argc, argv);
+
+	/*
+	 * This command behaves different for root and non-root
+	 * users.
+	 */
+	amroot = (getuid () == 0);
+
+	OPENLOG ("chfn");
+
+	/* parse the command line options */
+	process_flags (argc, argv);
+
+	/*
+	 * Get the name of the user to check. It is either the command line
+	 * name, or the name getlogin() returns.
+	 */
+	if (optind < argc) {
+		user = argv[optind];
+		pw = xgetpwnam (user);
+		if (NULL == pw) {
+			fprintf (stderr, _("%s: user '%s' does not exist\n"), Prog,
+			         user);
+			fail_exit (E_NOPERM);
+		}
+	} else {
+		pw = get_my_pwent ();
+		if (NULL == pw) {
+			fprintf (stderr,
+			         _("%s: Cannot determine your user name.\n"),
+			         Prog);
+			SYSLOG ((LOG_WARN, "Cannot determine the user name of the caller (UID %lu)",
+			         (unsigned long) getuid ()));
+			fail_exit (E_NOPERM);
+		}
+		user = xstrdup (pw->pw_name);
+	}
+
+#ifdef	USE_NIS
+	/*
+	 * Now we make sure this is a LOCAL password entry for this user ...
+	 */
+	if (__ispwNIS ()) {
+		char *nis_domain;
+		char *nis_master;
+
+		fprintf (stderr,
+		         _("%s: cannot change user '%s' on NIS client.\n"),
+		         Prog, user);
+
+		if (!yp_get_default_domain (&nis_domain) &&
+		    !yp_master (nis_domain, "passwd.byname", &nis_master)) {
+			fprintf (stderr,
+			         _
+			         ("%s: '%s' is the NIS master for this client.\n"),
+			         Prog, nis_master);
+		}
+		fail_exit (E_NOPERM);
+	}
+#endif
+
+	/* Check that the caller is allowed to change the gecos of the
+	 * specified user */
+	check_perms (pw);
+
+	/* If some fields were not set on the command line, load the value from
+	 * the old gecos fields. */
+	get_old_fields (pw->pw_gecos);
+
+	/*
+	 * If none of the fields were changed from the command line, let the
+	 * user interactively change them.
+	 */
+	if (!fflg && !rflg && !wflg && !hflg && !oflg) {
+		printf (_("Changing the user information for %s\n"), user);
+		new_fields ();
+	}
+
+	/*
+	 * Check all of the fields for valid information
+	 */
+	check_fields ();
+
+	/*
+	 * Build the new GECOS field by plastering all the pieces together,
+	 * if they will fit ...
+	 */
+	if ((strlen (fullnm) + strlen (roomno) + strlen (workph) +
+	     strlen (homeph) + strlen (slop)) > (unsigned int) 80) {
+		fprintf (stderr, _("%s: fields too long\n"), Prog);
+		fail_exit (E_NOPERM);
+	}
+	snprintf (new_gecos, sizeof new_gecos, "%s,%s,%s,%s%s%s",
+	          fullnm, roomno, workph, homeph,
+	          ('\0' != slop[0]) ? "," : "", slop);
+
+	/* Rewrite the user's gecos in the passwd file */
+	update_gecos (user, new_gecos);
+
+	SYSLOG ((LOG_INFO, "changed user '%s' information", user));
+
+	nscd_flush_cache ("passwd");
+	sssd_flush_cache (SSSD_DB_PASSWD);
+
+	closelog ();
+	exit (E_SUCCESS);
+}
+