/*
* chfn.c -- change your finger information
* (c) 1994 by salvatore valente <svalente@athena.mit.edu>
+ * (c) 2012 by Cody Maloney <cmaloney@theoreticalchaos.com>
*
* this program is free software. you can redistribute it and
* modify it under the terms of the gnu general public license.
* Hacked by Peter Breitenlohner, peb@mppmu.mpg.de,
* to remove trailing empty fields. Oct 5, 96.
*
- * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
+ * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
* - added Native Language Support
*/
#include "closestream.h"
#include "islocal.h"
#include "nls.h"
-#include "pamfail.h"
#include "setpwnam.h"
#include "strutils.h"
#include "xalloc.h"
+#include "logindefs.h"
+
+#include "ch-common.h"
#ifdef HAVE_LIBSELINUX
# include <selinux/selinux.h>
-# include <selinux/av_permissions.h>
# include "selinux_utils.h"
#endif
-static char buf[1024];
+#ifdef HAVE_LIBUSER
+# include <libuser/user.h>
+# include "libuser.h"
+#elif CHFN_CHSH_PASSWORD
+# include "auth.h"
+#endif
+
+#ifdef HAVE_LIBREADLINE
+# define _FUNCTION_DEF
+# include <readline/readline.h>
+#endif
struct finfo {
- struct passwd *pw;
- char *username;
char *full_name;
char *office;
char *office_phone;
char *other;
};
-static int parse_argv(int argc, char *argv[], struct finfo *pinfo);
-static void parse_passwd(struct passwd *pw, struct finfo *pinfo);
-static void ask_info(struct finfo *oldfp, struct finfo *newfp);
-static char *prompt(char *question, char *def_val);
-static int check_gecos_string(char *msg, char *gecos);
-static int set_changed_data(struct finfo *oldfp, struct finfo *newfp);
-static int save_new_data(struct finfo *pinfo);
+struct chfn_control {
+ struct passwd *pw;
+ char *username;
+ /* "oldf" Contains the users original finger information.
+ * "newf" Contains the changed finger information, and contains
+ * NULL in fields that haven't been changed.
+ * In the end, "newf" is folded into "oldf". */
+ struct finfo oldf, newf;
+ unsigned int
+ allow_fullname:1, /* The login.defs restriction */
+ allow_room:1, /* see: man login.defs(5) */
+ allow_work:1, /* and look for CHFN_RESTRICT */
+ allow_home:1, /* keyword for these four. */
+ changed:1, /* is change requested */
+ interactive:1; /* whether to prompt for fields or not */
+};
/* we do not accept gecos field sizes longer than MAX_FIELD_SIZE */
#define MAX_FIELD_SIZE 256
-static void __attribute__((__noreturn__)) usage(FILE *fp)
+static void __attribute__((__noreturn__)) usage(void)
{
+ FILE *fp = stdout;
fputs(USAGE_HEADER, fp);
- fprintf(fp, _(" %s [options] [username]\n"), program_invocation_short_name);
+ fprintf(fp, _(" %s [options] [<username>]\n"), program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, fp);
+ fputs(_("Change your finger information.\n"), fp);
+
fputs(USAGE_OPTIONS, fp);
fputs(_(" -f, --full-name <full-name> real name\n"), fp);
fputs(_(" -o, --office <office> office number\n"), fp);
fputs(_(" -p, --office-phone <phone> office phone number\n"), fp);
fputs(_(" -h, --home-phone <phone> home phone number\n"), fp);
fputs(USAGE_SEPARATOR, fp);
- fputs(_(" -u, --help display this help and exit\n"), fp);
- fputs(_(" -v, --version output version information and exit\n"), fp);
- fprintf(fp, USAGE_MAN_TAIL("chfn(1)"));
- exit(fp == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
+ printf( " -u, --help %s\n", USAGE_OPTSTR_HELP);
+ printf( " -v, --version %s\n", USAGE_OPTSTR_VERSION);
+ printf(USAGE_MAN_TAIL("chfn(1)"));
+ exit(EXIT_SUCCESS);
}
-int main(int argc, char **argv)
+/*
+ * check_gecos_string () --
+ * check that the given gecos string is legal. if it's not legal,
+ * output "msg" followed by a description of the problem, and return (-1).
+ */
+static int check_gecos_string(const char *msg, char *gecos)
{
- uid_t uid;
- struct finfo oldf, newf;
- int interactive;
- int status;
-
- sanitize_env();
- setlocale(LC_ALL, ""); /* both for messages and for iscntrl() below */
- bindtextdomain(PACKAGE, LOCALEDIR);
- textdomain(PACKAGE);
- atexit(close_stdout);
-
- /*
- * "oldf" contains the users original finger information.
- * "newf" contains the changed finger information, and contains NULL
- * in fields that haven't been changed.
- * in the end, "newf" is folded into "oldf".
- *
- * the reason the new finger information is not put _immediately_
- * into "oldf" is that on the command line, new finger information
- * can be specified before we know what user the information is
- * being specified for.
- */
- uid = getuid();
- memset(&oldf, 0, sizeof(oldf));
- memset(&newf, 0, sizeof(newf));
-
- interactive = parse_argv(argc, argv, &newf);
- if (!newf.username) {
- parse_passwd(getpwuid(uid), &oldf);
- if (!oldf.username)
- errx(EXIT_FAILURE, _("you (user %d) don't exist."),
- uid);
- } else {
- parse_passwd(getpwnam(newf.username), &oldf);
- if (!oldf.username)
- errx(EXIT_FAILURE, _("user \"%s\" does not exist."),
- newf.username);
- }
-
- if (!(is_local(oldf.username)))
- errx(EXIT_FAILURE, _("can only change local entries"));
-
-#ifdef HAVE_LIBSELINUX
- if (is_selinux_enabled() > 0) {
- if (uid == 0) {
- if (checkAccess(oldf.username, PASSWD__CHFN) != 0) {
- security_context_t user_context;
- if (getprevcon(&user_context) < 0)
- user_context = NULL;
- errx(EXIT_FAILURE,
- _("%s is not authorized to change "
- "the finger info of %s"),
- user_context ? : _("Unknown user context"),
- oldf.username);
- }
- }
- if (setupDefaultContext(_PATH_PASSWD))
- errx(EXIT_FAILURE,
- _("can't set default context for %s"), _PATH_PASSWD);
- }
-#endif
-
- /* Reality check */
- if (uid != 0 && uid != oldf.pw->pw_uid) {
- errno = EACCES;
- err(EXIT_FAILURE, NULL);
- }
-
- printf(_("Changing finger information for %s.\n"), oldf.username);
-
-#ifdef REQUIRE_PASSWORD
- if (uid != 0) {
- pam_handle_t *pamh = NULL;
- struct pam_conv conv = { misc_conv, NULL };
- int retcode;
-
- retcode = pam_start("chfn", oldf.username, &conv, &pamh);
- if (pam_fail_check(pamh, retcode))
- exit(EXIT_FAILURE);
-
- retcode = pam_authenticate(pamh, 0);
- if (pam_fail_check(pamh, retcode))
- exit(EXIT_FAILURE);
-
- retcode = pam_acct_mgmt(pamh, 0);
- if (retcode == PAM_NEW_AUTHTOK_REQD)
- retcode =
- pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
- if (pam_fail_check(pamh, retcode))
- exit(EXIT_FAILURE);
+ const size_t len = strlen(gecos);
- retcode = pam_setcred(pamh, 0);
- if (pam_fail_check(pamh, retcode))
- exit(EXIT_FAILURE);
-
- pam_end(pamh, 0);
- /* no need to establish a session; this isn't a
- * session-oriented activity... */
+ if (MAX_FIELD_SIZE < len) {
+ warnx(_("field %s is too long"), msg);
+ return -1;
}
-#endif /* REQUIRE_PASSWORD */
-
- if (interactive)
- ask_info(&oldf, &newf);
-
- if (!set_changed_data(&oldf, &newf)) {
- printf(_("Finger information not changed.\n"));
- return EXIT_SUCCESS;
+ if (illegal_passwd_chars(gecos)) {
+ warnx(_("%s: has illegal characters"), gecos);
+ return -1;
}
- status = save_new_data(&oldf);
- return status;
+ return 0;
}
/*
* parse the command line arguments.
* returns true if no information beyond the username was given.
*/
-static int parse_argv(int argc, char *argv[], struct finfo *pinfo)
+static void parse_argv(struct chfn_control *ctl, int argc, char **argv)
{
- int index, c, status;
- int info_given;
-
- static struct option long_options[] = {
- {"full-name", required_argument, 0, 'f'},
- {"office", required_argument, 0, 'o'},
- {"office-phone", required_argument, 0, 'p'},
- {"home-phone", required_argument, 0, 'h'},
- {"help", no_argument, 0, 'u'},
- {"version", no_argument, 0, 'v'},
- {NULL, no_argument, 0, '0'},
+ int index, c, status = 0;
+ static const struct option long_options[] = {
+ { "full-name", required_argument, NULL, 'f' },
+ { "office", required_argument, NULL, 'o' },
+ { "office-phone", required_argument, NULL, 'p' },
+ { "home-phone", required_argument, NULL, 'h' },
+ { "help", no_argument, NULL, 'u' },
+ { "version", no_argument, NULL, 'v' },
+ { NULL, 0, NULL, 0 },
};
- optind = 0;
- info_given = false;
- while (true) {
- c = getopt_long(argc, argv, "f:r:p:h:o:uv", long_options,
- &index);
- if (c == -1)
- break;
- /* version? output version and exit. */
- if (c == 'v') {
- printf(UTIL_LINUX_VERSION);
- exit(EXIT_SUCCESS);
- }
- if (c == 'u')
- usage(stdout);
- /* all other options must have an argument. */
- if (!optarg)
- usage(stderr);
- /* ok, we were given an argument */
- info_given = true;
- status = 0;
-
- /* now store the argument */
+ while ((c = getopt_long(argc, argv, "f:r:p:h:o:uv", long_options,
+ &index)) != -1) {
switch (c) {
case 'f':
- pinfo->full_name = optarg;
- status = check_gecos_string(_("Name"), optarg);
+ if (!ctl->allow_fullname)
+ errx(EXIT_FAILURE, _("login.defs forbids setting %s"), _("Name"));
+ ctl->newf.full_name = optarg;
+ status += check_gecos_string(_("Name"), optarg);
break;
case 'o':
- pinfo->office = optarg;
- status = check_gecos_string(_("Office"), optarg);
+ if (!ctl->allow_room)
+ errx(EXIT_FAILURE, _("login.defs forbids setting %s"), _("Office"));
+ ctl->newf.office = optarg;
+ status += check_gecos_string(_("Office"), optarg);
break;
case 'p':
- pinfo->office_phone = optarg;
- status = check_gecos_string(_("Office Phone"), optarg);
+ if (!ctl->allow_work)
+ errx(EXIT_FAILURE, _("login.defs forbids setting %s"), _("Office Phone"));
+ ctl->newf.office_phone = optarg;
+ status += check_gecos_string(_("Office Phone"), optarg);
break;
case 'h':
- pinfo->home_phone = optarg;
- status = check_gecos_string(_("Home Phone"), optarg);
+ if (!ctl->allow_home)
+ errx(EXIT_FAILURE, _("login.defs forbids setting %s"), _("Home Phone"));
+ ctl->newf.home_phone = optarg;
+ status += check_gecos_string(_("Home Phone"), optarg);
break;
+ case 'v':
+ print_version(EXIT_SUCCESS);
+ case 'u':
+ usage();
default:
- usage(stderr);
+ errtryhelp(EXIT_FAILURE);
}
- if (status < 0)
- exit(status);
+ ctl->changed = 1;
+ ctl->interactive = 0;
}
+ if (status != 0)
+ exit(EXIT_FAILURE);
/* done parsing arguments. check for a username. */
if (optind < argc) {
- if (optind + 1 < argc)
- usage(stderr);
- pinfo->username = argv[optind];
+ if (optind + 1 < argc) {
+ warnx(_("cannot handle multiple usernames"));
+ errtryhelp(EXIT_FAILURE);
+ }
+ ctl->username = argv[optind];
}
- return (!info_given);
+ return;
}
/*
* parse_passwd () --
* take a struct password and fill in the fields of the struct finfo.
*/
-static void parse_passwd(struct passwd *pw, struct finfo *pinfo)
+static void parse_passwd(struct chfn_control *ctl)
{
char *gecos;
- char *cp;
-
- if (pw) {
- pinfo->pw = pw;
- pinfo->username = pw->pw_name;
- /* use pw_gecos - we take a copy since PAM destroys the original */
- gecos = xstrdup(pw->pw_gecos);
- cp = (gecos ? gecos : "");
- pinfo->full_name = cp;
- cp = strchr(cp, ',');
- if (cp) {
- *cp = 0, cp++;
- } else
- return;
- pinfo->office = cp;
- cp = strchr(cp, ',');
- if (cp) {
- *cp = 0, cp++;
- } else
- return;
- pinfo->office_phone = cp;
- cp = strchr(cp, ',');
- if (cp) {
- *cp = 0, cp++;
- } else
- return;
- pinfo->home_phone = cp;
- /* extra fields contain site-specific information, and can
- * not be changed by this version of chfn. */
- cp = strchr(cp, ',');
- if (cp) {
- *cp = 0, cp++;
- } else
- return;
- pinfo->other = cp;
- }
-}
-/*
- * ask_info () --
- * prompt the user for the finger information and store it.
- */
-static void ask_info(struct finfo *oldfp, struct finfo *newfp)
-{
- newfp->full_name = prompt(_("Name"), oldfp->full_name);
- newfp->office = prompt(_("Office"), oldfp->office);
- newfp->office_phone = prompt(_("Office Phone"), oldfp->office_phone);
- newfp->home_phone = prompt(_("Home Phone"), oldfp->home_phone);
- printf("\n");
+ if (!ctl->pw)
+ return;
+ /* use pw_gecos - we take a copy since PAM destroys the original */
+ gecos = xstrdup(ctl->pw->pw_gecos);
+ /* extract known fields */
+ ctl->oldf.full_name = strsep(&gecos, ",");
+ ctl->oldf.office = strsep(&gecos, ",");
+ ctl->oldf.office_phone = strsep(&gecos, ",");
+ ctl->oldf.home_phone = strsep(&gecos, ",");
+ /* extra fields contain site-specific information, and can
+ * not be changed by this version of chfn. */
+ ctl->oldf.other = strsep(&gecos, ",");
}
/*
- * prompt () --
+ * ask_new_field () --
* ask the user for a given field and check that the string is legal.
*/
-static char *prompt(char *question, char *def_val)
+static char *ask_new_field(struct chfn_control *ctl, const char *question,
+ char *def_val)
{
- static char *blank = "none";
int len;
- char *ans, *cp;
+ char *buf;
+#ifndef HAVE_LIBREADLINE
+ size_t dummy = 0;
+#endif
+ if (!def_val)
+ def_val = "";
while (true) {
- if (!def_val)
- def_val = "";
printf("%s [%s]: ", question, def_val);
- *buf = 0;
- if (fgets(buf, sizeof(buf), stdin) == NULL)
+ __fpurge(stdin);
+#ifdef HAVE_LIBREADLINE
+ rl_bind_key('\t', rl_insert);
+ if ((buf = readline(NULL)) == NULL)
+#else
+ if (getline(&buf, &dummy, stdin) < 0)
+#endif
errx(EXIT_FAILURE, _("Aborted."));
- /* remove the newline at the end of buf. */
- ans = buf;
- while (isspace(*ans))
- ans++;
- len = strlen(ans);
- while (len > 0 && isspace(ans[len - 1]))
- len--;
- if (len <= 0)
- return NULL;
- ans[len] = 0;
- if (!strcasecmp(ans, blank))
- return "";
- if (check_gecos_string(NULL, ans) >= 0)
+ /* remove white spaces from string end */
+ ltrim_whitespace((unsigned char *) buf);
+ len = rtrim_whitespace((unsigned char *) buf);
+ if (len == 0) {
+ free(buf);
+ return xstrdup(def_val);
+ }
+ if (!strcasecmp(buf, "none")) {
+ free(buf);
+ ctl->changed = 1;
+ return xstrdup("");
+ }
+ if (check_gecos_string(question, buf) >= 0)
break;
}
- cp = (char *)xmalloc(len + 1);
- strcpy(cp, ans);
- return cp;
+ ctl->changed = 1;
+ return buf;
}
/*
- * check_gecos_string () --
- * check that the given gecos string is legal. if it's not legal,
- * output "msg" followed by a description of the problem, and return (-1).
+ * get_login_defs()
+ * find /etc/login.defs CHFN_RESTRICT and save restrictions to run time
*/
-static int check_gecos_string(char *msg, char *gecos)
+static void get_login_defs(struct chfn_control *ctl)
{
- unsigned int i, c;
-
- if (strlen(gecos) > MAX_FIELD_SIZE) {
- if (msg)
- warnx(_("field %s is too long"), msg);
- else
- warnx(_("field is too long"));
- return -1;
+ const char *s;
+ size_t i;
+ int broken = 0;
+
+ /* real root does not have restrictions */
+ if (geteuid() == getuid() && getuid() == 0) {
+ ctl->allow_fullname = ctl->allow_room = ctl->allow_work = ctl->allow_home = 1;
+ return;
}
-
- for (i = 0; i < strlen(gecos); i++) {
- c = gecos[i];
- if (c == ',' || c == ':' || c == '=' || c == '"' || c == '\n') {
- if (msg)
- warnx(_("%s: '%c' is not allowed"), msg, c);
- else
- warnx(_("'%c' is not allowed"), c);
- return -1;
- }
- if (iscntrl(c)) {
- if (msg)
- warnx(_
- ("%s: control characters are not allowed"),
- msg);
- else
- warnx(_("control characters are not allowed"));
- return -1;
+ s = getlogindefs_str("CHFN_RESTRICT", "");
+ if (!strcmp(s, "yes")) {
+ ctl->allow_room = ctl->allow_work = ctl->allow_home = 1;
+ return;
+ }
+ if (!strcmp(s, "no")) {
+ ctl->allow_fullname = ctl->allow_room = ctl->allow_work = ctl->allow_home = 1;
+ return;
+ }
+ for (i = 0; s[i]; i++) {
+ switch (s[i]) {
+ case 'f':
+ ctl->allow_fullname = 1;
+ break;
+ case 'r':
+ ctl->allow_room = 1;
+ break;
+ case 'w':
+ ctl->allow_work = 1;
+ break;
+ case 'h':
+ ctl->allow_home = 1;
+ break;
+ default:
+ broken = 1;
}
}
- return 0;
+ if (broken)
+ warnx(_("%s: CHFN_RESTRICT has unexpected value: %s"), _PATH_LOGINDEFS, s);
+ if (!ctl->allow_fullname && !ctl->allow_room && !ctl->allow_work && !ctl->allow_home)
+ errx(EXIT_FAILURE, _("%s: CHFN_RESTRICT does not allow any changes"), _PATH_LOGINDEFS);
+ return;
}
/*
- * set_changed_data () --
- * incorporate the new data into the old finger info.
+ * ask_info () --
+ * prompt the user for the finger information and store it.
*/
-static int set_changed_data(struct finfo *oldfp, struct finfo *newfp)
+static void ask_info(struct chfn_control *ctl)
{
- int changed = false;
+ if (ctl->allow_fullname)
+ ctl->newf.full_name = ask_new_field(ctl, _("Name"), ctl->oldf.full_name);
+ if (ctl->allow_room)
+ ctl->newf.office = ask_new_field(ctl, _("Office"), ctl->oldf.office);
+ if (ctl->allow_work)
+ ctl->newf.office_phone = ask_new_field(ctl, _("Office Phone"), ctl->oldf.office_phone);
+ if (ctl->allow_home)
+ ctl->newf.home_phone = ask_new_field(ctl, _("Home Phone"), ctl->oldf.home_phone);
+ putchar('\n');
+}
- if (newfp->full_name) {
- oldfp->full_name = newfp->full_name;
- changed = true;
- }
- if (newfp->office) {
- oldfp->office = newfp->office;
- changed = true;
- }
- if (newfp->office_phone) {
- oldfp->office_phone = newfp->office_phone;
- changed = true;
- }
- if (newfp->home_phone) {
- oldfp->home_phone = newfp->home_phone;
- changed = true;
- }
+/*
+ * find_field () --
+ * find field value in uninteractive mode; can be new, old, or blank
+ */
+static char *find_field(char *nf, char *of)
+{
+ if (nf)
+ return nf;
+ if (of)
+ return of;
+ return xstrdup("");
+}
- return changed;
+/*
+ * add_missing () --
+ * add not supplied field values when in uninteractive mode
+ */
+static void add_missing(struct chfn_control *ctl)
+{
+ ctl->newf.full_name = find_field(ctl->newf.full_name, ctl->oldf.full_name);
+ ctl->newf.office = find_field(ctl->newf.office, ctl->oldf.office);
+ ctl->newf.office_phone = find_field(ctl->newf.office_phone, ctl->oldf.office_phone);
+ ctl->newf.home_phone = find_field(ctl->newf.home_phone, ctl->oldf.home_phone);
+ ctl->newf.other = find_field(ctl->newf.other, ctl->oldf.other);
+ printf("\n");
}
/*
* save the given finger info in /etc/passwd.
* return zero on success.
*/
-static int save_new_data(struct finfo *pinfo)
+static int save_new_data(struct chfn_control *ctl)
{
char *gecos;
int len;
- /* null fields will confuse printf(). */
- if (!pinfo->full_name)
- pinfo->full_name = "";
- if (!pinfo->office)
- pinfo->office = "";
- if (!pinfo->office_phone)
- pinfo->office_phone = "";
- if (!pinfo->home_phone)
- pinfo->home_phone = "";
- if (!pinfo->other)
- pinfo->other = "";
-
/* create the new gecos string */
- len = (strlen(pinfo->full_name) + strlen(pinfo->office) +
- strlen(pinfo->office_phone) + strlen(pinfo->home_phone) +
- strlen(pinfo->other) + 4);
- gecos = (char *)xmalloc(len + 1);
- sprintf(gecos, "%s,%s,%s,%s,%s", pinfo->full_name, pinfo->office,
- pinfo->office_phone, pinfo->home_phone, pinfo->other);
-
- /* remove trailing empty fields (but not subfields of pinfo->other) */
- if (!pinfo->other[0]) {
+ len = xasprintf(&gecos, "%s,%s,%s,%s,%s",
+ ctl->newf.full_name,
+ ctl->newf.office,
+ ctl->newf.office_phone,
+ ctl->newf.home_phone,
+ ctl->newf.other);
+
+ /* remove trailing empty fields (but not subfields of ctl->newf.other) */
+ if (!ctl->newf.other || !*ctl->newf.other) {
while (len > 0 && gecos[len - 1] == ',')
len--;
gecos[len] = 0;
}
+#ifdef HAVE_LIBUSER
+ if (set_value_libuser("chfn", ctl->username, ctl->pw->pw_uid,
+ LU_GECOS, gecos) < 0) {
+#else /* HAVE_LIBUSER */
/* write the new struct passwd to the passwd file. */
- pinfo->pw->pw_gecos = gecos;
- if (setpwnam(pinfo->pw) < 0) {
- warn("setpwnam");
+ ctl->pw->pw_gecos = gecos;
+ if (setpwnam(ctl->pw, ".chfn") < 0) {
+ warn("setpwnam failed");
+#endif
printf(_
("Finger information *NOT* changed. Try again later.\n"));
return -1;
}
+ free(gecos);
printf(_("Finger information changed.\n"));
return 0;
}
+
+int main(int argc, char **argv)
+{
+ uid_t uid;
+ struct chfn_control ctl = {
+ .interactive = 1
+ };
+
+ sanitize_env();
+ setlocale(LC_ALL, ""); /* both for messages and for iscntrl() below */
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
+
+ uid = getuid();
+
+ /* check /etc/login.defs CHFN_RESTRICT */
+ get_login_defs(&ctl);
+
+ parse_argv(&ctl, argc, argv);
+ if (!ctl.username) {
+ ctl.pw = getpwuid(uid);
+ if (!ctl.pw)
+ errx(EXIT_FAILURE, _("you (user %d) don't exist."),
+ uid);
+ ctl.username = ctl.pw->pw_name;
+ } else {
+ ctl.pw = getpwnam(ctl.username);
+ if (!ctl.pw)
+ errx(EXIT_FAILURE, _("user \"%s\" does not exist."),
+ ctl.username);
+ }
+ parse_passwd(&ctl);
+#ifndef HAVE_LIBUSER
+ if (!(is_local(ctl.username)))
+ errx(EXIT_FAILURE, _("can only change local entries"));
+#endif
+
+#ifdef HAVE_LIBSELINUX
+ if (is_selinux_enabled() > 0) {
+ if (uid == 0) {
+ access_vector_t av = get_access_vector("passwd", "chfn");
+
+ if (selinux_check_passwd_access(av) != 0) {
+ security_context_t user_context;
+ if (getprevcon(&user_context) < 0)
+ user_context = NULL;
+ errx(EXIT_FAILURE,
+ _("%s is not authorized to change "
+ "the finger info of %s"),
+ user_context ? : _("Unknown user context"),
+ ctl.username);
+ }
+ }
+ if (setupDefaultContext(_PATH_PASSWD))
+ errx(EXIT_FAILURE,
+ _("can't set default context for %s"), _PATH_PASSWD);
+ }
+#endif
+
+#ifdef HAVE_LIBUSER
+ /* If we're setuid and not really root, disallow the password change. */
+ if (geteuid() != getuid() && uid != ctl.pw->pw_uid) {
+#else
+ if (uid != 0 && uid != ctl.pw->pw_uid) {
+#endif
+ errno = EACCES;
+ err(EXIT_FAILURE, _("running UID doesn't match UID of user we're "
+ "altering, change denied"));
+ }
+
+ printf(_("Changing finger information for %s.\n"), ctl.username);
+
+#if !defined(HAVE_LIBUSER) && defined(CHFN_CHSH_PASSWORD)
+ if (!auth_pam("chfn", uid, ctl.username)) {
+ return EXIT_FAILURE;
+ }
+#endif
+
+ if (ctl.interactive)
+ ask_info(&ctl);
+
+ add_missing(&ctl);
+
+ if (!ctl.changed) {
+ printf(_("Finger information not changed.\n"));
+ return EXIT_SUCCESS;
+ }
+
+ return save_new_data(&ctl) == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+}
projects / thirdparty / util-linux.git / blobdiff