* src/su.c: environ is provided by <unistd.h>.
* src/su.c: Added function prototypes. * src/su.c: Rename shellstr parameter to shellname to avoid collision with static variable. * NEWS, src/su.c: Added support for PAM modules which change PAM_USER.
This commit is contained in:
nekral-guest
parent
66d71aafb7
commit
907025eb40
@ -1,3 +1,12 @@
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2011-06-16 Nicolas François <nicolas.francois@centraliens.net>
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* src/su.c: environ is provided by <unistd.h>.
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* src/su.c: Added function prototypes.
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* src/su.c: Rename shellstr parameter to shellname to avoid
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collision with static variable.
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* NEWS, src/su.c: Added support for PAM modules which change
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PAM_USER.
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2011-06-13 Nicolas François <nicolas.francois@centraliens.net>
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* src/su.c (prepare_pam_close_session): Extract the creation of a
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2
NEWS
2
NEWS
@ -48,6 +48,7 @@ shadow-4.1.4.3 -> shadow-4.1.5 UNRELEASED
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caller's privileges.
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* Close PAM sessions as root. This will be more friendly to PAM modules
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like pam_mount or pam_systemd.
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* Added support for PAM modules which change PAM_USER.
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- newgrp, sg, groupmems
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* Fix parsing of gshadow entries.
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- useradd
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@ -67,6 +68,7 @@ shadow-4.1.4.3 -> shadow-4.1.5 UNRELEASED
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* Updated Czech translation.
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* Updated Danish translation.
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* Updated French translation.
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* Updated French man pages translation.
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* Updated German translation.
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* Updated German man pages translation.
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* Updated Japanese translation.
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63
src/su.c
63
src/su.c
@ -115,13 +115,12 @@ static pid_t pid_child = 0;
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* External identifiers
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*/
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extern char **newenvp;
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extern char **environ;
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extern size_t newenvc;
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extern char **newenvp; /* libmisc/env.c */
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extern size_t newenvc; /* libmisc/env.c */
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/* local function prototypes */
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static void execve_shell (const char *shellstr,
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static void execve_shell (const char *shellname,
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char *args[],
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char *const envp[]);
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#ifdef USE_PAM
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@ -131,6 +130,8 @@ static void prepare_pam_close_session (void);
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static RETSIGTYPE die (int);
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static bool iswheel (const char *);
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#endif /* !USE_PAM */
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static bool restricted_shell (const char *shellname);
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static void su_failure (const char *tty, bool su_to_root);
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static struct passwd * check_perms (void);
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#ifdef USE_PAM
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static void check_perms_pam (struct passwd *pw);
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@ -139,6 +140,7 @@ static void check_perms_nopam (struct passwd *pw);
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#endif /* !USE_PAM */
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static void save_caller_context (char **argv);
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static void process_flags (int argc, char **argv);
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static void set_environment (struct passwd *pw);
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#ifndef USE_PAM
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/*
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@ -190,13 +192,13 @@ static RETSIGTYPE kill_child (int unused(s))
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#endif /* USE_PAM */
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/* borrowed from GNU sh-utils' "su.c" */
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static bool restricted_shell (const char *shellstr)
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static bool restricted_shell (const char *shellname)
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{
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char *line;
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setusershell ();
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while ((line = getusershell ()) != NULL) {
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if (('#' != *line) && (strcmp (line, shellstr) == 0)) {
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if (('#' != *line) && (strcmp (line, shellname) == 0)) {
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endusershell ();
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return false;
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}
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@ -224,15 +226,15 @@ static void su_failure (const char *tty, bool su_to_root)
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* execve_shell - Execute a shell with execve, or interpret it with
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* /bin/sh
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*/
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static void execve_shell (const char *shellstr,
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static void execve_shell (const char *shellname,
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char *args[],
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char *const envp[])
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{
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int err;
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(void) execve (shellstr, (char **) args, envp);
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(void) execve (shellname, (char **) args, envp);
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err = errno;
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if (access (shellstr, R_OK|X_OK) == 0) {
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if (access (shellname, R_OK|X_OK) == 0) {
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/*
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* Assume this is a shell script (with no shebang).
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* Interpret it with /bin/sh
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@ -245,7 +247,7 @@ static void execve_shell (const char *shellstr,
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targs = (char **) xmalloc ((n_args + 3) * sizeof (args[0]));
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targs[0] = "sh";
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targs[1] = "-";
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targs[2] = xstrdup (shellstr);
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targs[2] = xstrdup (shellname);
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targs[n_args+2] = NULL;
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while (1 != n_args) {
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targs[n_args+1] = args[n_args - 1];
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@ -570,24 +572,57 @@ static void check_perms_nopam (struct passwd *pw)
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*/
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static struct passwd * check_perms (void)
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{
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#ifdef USE_PAM
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const char *tmp_name;
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int ret;
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#endif /* !USE_PAM */
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/*
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* The password file entries for the user is gotten and the account
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* validated.
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*/
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struct passwd *pw = xgetpwnam (name);
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if (NULL == pw) {
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(void) fprintf (stderr, _("Unknown id: %s\n"), name);
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closelog ();
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exit (1);
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(void) fprintf (stderr,
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_("No passwd entry for user '%s'\n"), name);
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SYSLOG ((LOG_ERR, "No passwd entry for user '%s'", name));
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su_failure (caller_tty, true);
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}
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(void) signal (SIGINT, SIG_IGN);
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(void) signal (SIGQUIT, SIG_IGN);
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#ifdef USE_PAM
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check_perms_pam (pw);
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/* PAM authentication can request a change of account */
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ret = pam_get_item(pamh, PAM_USER, (const void **) &tmp_name);
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if (ret != PAM_SUCCESS) {
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SYSLOG((LOG_ERR, "pam_get_item: internal PAM error\n"));
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(void) fprintf (stderr,
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"%s: Internal PAM error retrieving username\n",
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Prog);
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(void) pam_end (pamh, ret);
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su_failure (caller_tty, 0 == pw->pw_uid);
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}
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if (strcmp (name, tmp_name) != 0) {
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SYSLOG ((LOG_INFO,
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"Change user from '%s' to '%s' as requested by PAM",
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name, tmp_name));
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strncpy (name, tmp_name, sizeof(name) - 1);
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name[sizeof(name) - 1] = '\0';
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pw = xgetpwnam (name);
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if (NULL == pw) {
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(void) fprintf (stderr,
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_("No passwd entry for user '%s'\n"),
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name);
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SYSLOG ((LOG_ERR,
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"No passwd entry for user '%s'", name));
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su_failure (caller_tty, true);
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}
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}
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#else /* !USE_PAM */
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check_perms_nopam (pw);
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#endif /* !USE_PAM */
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(void) signal (SIGINT, SIG_DFL);
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(void) signal (SIGQUIT, SIG_DFL);
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@ -659,7 +694,7 @@ static void save_caller_context (char **argv)
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Prog);
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SYSLOG ((LOG_WARN, "Cannot determine the user name of the caller (UID %lu)",
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(unsigned long) caller_uid));
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su_failure (caller_tty, true); // FIXME: at this time I do not know the target UID
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su_failure (caller_tty, true); /* unknown target UID*/
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}
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STRFCPY (caller_name, pw->pw_name);
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