* src/su.c: Extract command line processing from main().
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nekral-guest
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43e65fdd46
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dbe0b96404
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@ -8,6 +8,7 @@
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* src/su.c: Merge environment setting blocks after the creation of
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the session.
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* src/su.c: Close the password databases together with syslog.
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* src/su.c: Extract command line processing from main().
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2011-06-10 Nicolas François <nicolas.francois@centraliens.net>
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189
src/su.c
189
src/su.c
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@ -75,15 +75,19 @@
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* Global variables
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*/
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const char *Prog;
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const char *caller_tty = NULL; /* Name of tty SU is run from */
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bool caller_is_root = false;
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uid_t caller_uid;
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static const char *caller_tty = NULL; /* Name of tty SU is run from */
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static bool caller_is_root = false;
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static uid_t caller_uid;
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#ifndef USE_PAM
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int caller_on_console = 0;
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static int caller_on_console = 0;
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#ifdef SU_ACCESS
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char *caller_pass;
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static char *caller_pass;
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#endif
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#endif /* !USE_PAM */
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static bool doshell = false;
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static bool fakelogin = false;
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static char *shellstr = NULL;
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static char *command = NULL;
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/* not needed by sulog.c anymore */
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@ -91,7 +95,7 @@ static char name[BUFSIZ];
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static char caller_name[BUFSIZ];
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/* If nonzero, change some environment vars to indicate the user su'd to. */
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static bool change_environment;
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static bool change_environment = true;
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#ifdef USE_PAM
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static pam_handle_t *pamh = NULL;
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@ -121,11 +125,12 @@ static bool iswheel (const char *);
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#endif /* !USE_PAM */
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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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static void check_perms_pam (struct passwd *pw);
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#else /* !USE_PAM */
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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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#ifndef USE_PAM
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/*
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@ -590,7 +595,7 @@ static struct passwd * check_perms (void)
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#ifdef USE_PAM
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check_perms_pam (pw);
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#else /* !USE_PAM */
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check_perms_pam (pw);
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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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@ -685,99 +690,61 @@ static void save_caller_context (char **argv)
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}
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/*
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* su - switch user id
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* process_flags - Process the command line arguments
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*
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* su changes the user's ids to the values for the specified user. if
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* no new user name is specified, "root" or UID 0 is used by default.
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*
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* Any additional arguments are passed to the user's shell. In
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* particular, the argument "-c" will cause the next argument to be
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* interpreted as a command by the common shell programs.
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* process_flags() interprets the command line arguments and sets
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* the values that the user will be created with accordingly. The
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* values are checked for sanity.
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*/
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int main (int argc, char **argv)
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static void process_flags (int argc, char **argv)
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{
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const char *cp;
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bool doshell = false;
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bool fakelogin = false;
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struct passwd *pw = NULL;
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char *shellstr = NULL;
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char *command = NULL;
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int option_index = 0;
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int c;
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static struct option long_options[] = {
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{"command", required_argument, NULL, 'c'},
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{"help", no_argument, NULL, 'h'},
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{"login", no_argument, NULL, 'l'},
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{"preserve-environment", no_argument, NULL, 'p'},
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{"shell", required_argument, NULL, 's'},
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{NULL, 0, NULL, '\0'}
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};
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#ifdef USE_PAM
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int ret;
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#else /* !USE_PAM */
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int err = 0;
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#endif /* !USE_PAM */
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(void) setlocale (LC_ALL, "");
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(void) bindtextdomain (PACKAGE, LOCALEDIR);
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(void) textdomain (PACKAGE);
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change_environment = true;
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save_caller_context (argv);
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OPENLOG ("su");
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/*
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* Process the command line arguments.
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*/
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{
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/*
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* Parse the command line options.
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*/
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int option_index = 0;
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int c;
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static struct option long_options[] = {
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{"command", required_argument, NULL, 'c'},
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{"help", no_argument, NULL, 'h'},
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{"login", no_argument, NULL, 'l'},
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{"preserve-environment", no_argument, NULL, 'p'},
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{"shell", required_argument, NULL, 's'},
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{NULL, 0, NULL, '\0'}
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};
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while ((c =
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getopt_long (argc, argv, "c:hlmps:", long_options,
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&option_index)) != -1) {
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switch (c) {
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case 'c':
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command = optarg;
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break;
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case 'h':
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usage (E_SUCCESS);
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break;
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case 'l':
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fakelogin = true;
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break;
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case 'm':
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case 'p':
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/* This will only have an effect if the target
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* user do not have a restricted shell, or if
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* su is called by root.
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*/
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change_environment = false;
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break;
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case 's':
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shellstr = optarg;
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break;
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default:
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usage (E_USAGE); /* NOT REACHED */
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}
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}
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if ((optind < argc) && (strcmp (argv[optind], "-") == 0)) {
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while ((c = getopt_long (argc, argv, "c:hlmps:", long_options,
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&option_index)) != -1) {
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switch (c) {
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case 'c':
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command = optarg;
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break;
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case 'h':
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usage (E_SUCCESS);
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break;
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case 'l':
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fakelogin = true;
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optind++;
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if ( (optind < argc)
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&& (strcmp (argv[optind], "--") == 0)) {
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optind++;
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}
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break;
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case 'm':
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case 'p':
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/* This will only have an effect if the target
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* user do not have a restricted shell, or if
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* su is called by root.
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*/
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change_environment = false;
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break;
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case 's':
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shellstr = optarg;
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break;
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default:
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usage (E_USAGE); /* NOT REACHED */
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}
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}
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initenv ();
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if ((optind < argc) && (strcmp (argv[optind], "-") == 0)) {
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fakelogin = true;
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optind++;
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if ( (optind < argc)
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&& (strcmp (argv[optind], "--") == 0)) {
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optind++;
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}
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}
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/*
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* The next argument must be either a user ID, or some flag to a
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@ -809,6 +776,40 @@ int main (int argc, char **argv)
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if (NULL != command) {
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doshell = false;
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}
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}
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/*
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* su - switch user id
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*
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* su changes the user's ids to the values for the specified user. if
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* no new user name is specified, "root" or UID 0 is used by default.
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*
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* Any additional arguments are passed to the user's shell. In
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* particular, the argument "-c" will cause the next argument to be
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* interpreted as a command by the common shell programs.
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*/
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int main (int argc, char **argv)
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{
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const char *cp;
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struct passwd *pw = NULL;
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#ifdef USE_PAM
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int ret;
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#else /* !USE_PAM */
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int err = 0;
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#endif /* !USE_PAM */
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(void) setlocale (LC_ALL, "");
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(void) bindtextdomain (PACKAGE, LOCALEDIR);
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(void) textdomain (PACKAGE);
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save_caller_context (argv);
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OPENLOG ("su");
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process_flags (argc, argv);
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initenv ();
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#ifdef USE_PAM
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ret = pam_start ("su", name, &conv, &pamh);
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@ -898,7 +899,7 @@ int main (int argc, char **argv)
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ret = pam_open_session (pamh, 0);
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if (PAM_SUCCESS != ret) {
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SYSLOG ((LOG_ERR, "pam_open_session: %s",
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pam_strerror (pamh, ret)));
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pam_strerror (pamh, ret)));
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fprintf (stderr, _("%s: %s\n"), Prog, pam_strerror (pamh, ret));
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pam_setcred (pamh, PAM_DELETE_CRED);
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(void) pam_end (pamh, ret);
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