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Annotation of embedaddon/sudo/plugins/sudoers/auth/bsdauth.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (c) 2000-2005, 2007-2008, 2010-2011
                      3:  *     Todd C. Miller <Todd.Miller@courtesan.com>
                      4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
                      8:  *
                      9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     16:  *
                     17:  * Sponsored in part by the Defense Advanced Research Projects
                     18:  * Agency (DARPA) and Air Force Research Laboratory, Air Force
                     19:  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
                     20:  */
                     21: 
                     22: #include <config.h>
                     23: 
                     24: #include <sys/types.h>
                     25: #include <sys/param.h>
                     26: #include <stdio.h>
                     27: #ifdef STDC_HEADERS
                     28: # include <stdlib.h>
                     29: # include <stddef.h>
                     30: #else
                     31: # ifdef HAVE_STDLIB_H
                     32: #  include <stdlib.h>
                     33: # endif
                     34: #endif /* STDC_HEADERS */
                     35: #ifdef HAVE_STRING_H
                     36: # include <string.h>
                     37: #endif /* HAVE_STRING_H */
                     38: #ifdef HAVE_STRINGS_H
                     39: # include <strings.h>
                     40: #endif /* HAVE_STRING_H */
                     41: #ifdef HAVE_UNISTD_H
                     42: # include <unistd.h>
                     43: #endif /* HAVE_UNISTD_H */
                     44: #include <ctype.h>
                     45: #include <pwd.h>
                     46: #include <signal.h>
                     47: 
                     48: #include <login_cap.h>
                     49: #include <bsd_auth.h>
                     50: 
                     51: #include "sudoers.h"
                     52: #include "sudo_auth.h"
                     53: 
                     54: extern char *login_style;              /* from sudo.c */
                     55: 
                     56: int
                     57: bsdauth_init(struct passwd *pw, sudo_auth *auth)
                     58: {
                     59:     static auth_session_t *as;
                     60:     extern login_cap_t *lc;                    /* from sudo.c */
                     61: 
                     62:     if ((as = auth_open()) == NULL) {
                     63:        log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
                     64:            _("unable to begin bsd authentication"));
                     65:        return AUTH_FATAL;
                     66:     }
                     67: 
                     68:     /* XXX - maybe sanity check the auth style earlier? */
                     69:     login_style = login_getstyle(lc, login_style, "auth-sudo");
                     70:     if (login_style == NULL) {
                     71:        log_error(NO_EXIT|NO_MAIL, _("invalid authentication type"));
                     72:        auth_close(as);
                     73:        return AUTH_FATAL;
                     74:     }
                     75: 
                     76:      if (auth_setitem(as, AUTHV_STYLE, login_style) < 0 ||
                     77:        auth_setitem(as, AUTHV_NAME, pw->pw_name) < 0 ||
                     78:        auth_setitem(as, AUTHV_CLASS, login_class) < 0) {
                     79:        log_error(NO_EXIT|NO_MAIL, _("unable to setup authentication"));
                     80:        auth_close(as);
                     81:        return AUTH_FATAL;
                     82:     }
                     83: 
                     84:     auth->data = (void *) as;
                     85:     return AUTH_SUCCESS;
                     86: }
                     87: 
                     88: int
                     89: bsdauth_verify(struct passwd *pw, char *prompt, sudo_auth *auth)
                     90: {
                     91:     char *pass;
                     92:     char *s;
                     93:     size_t len;
                     94:     int authok = 0;
                     95:     sigaction_t sa, osa;
                     96:     auth_session_t *as = (auth_session_t *) auth->data;
                     97: 
                     98:     /* save old signal handler */
                     99:     sigemptyset(&sa.sa_mask);
                    100:     sa.sa_flags = SA_RESTART;
                    101:     sa.sa_handler = SIG_DFL;
                    102:     (void) sigaction(SIGCHLD, &sa, &osa);
                    103: 
                    104:     /*
                    105:      * If there is a challenge then print that instead of the normal
                    106:      * prompt.  If the user just hits return we prompt again with echo
                    107:      * turned on, which is useful for challenge/response things like
                    108:      * S/Key.
                    109:      */
                    110:     if ((s = auth_challenge(as)) == NULL) {
                    111:        pass = auth_getpass(prompt, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF);
                    112:     } else {
                    113:        pass = auth_getpass(prompt, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF);
                    114:        if (pass && *pass == '\0') {
                    115:            if ((prompt = strrchr(s, '\n')))
                    116:                prompt++;
                    117:            else
                    118:                prompt = s;
                    119: 
                    120:            /*
                    121:             * Append '[echo on]' to the last line of the challenge and
                    122:             * reprompt with echo turned on.
                    123:             */
                    124:            len = strlen(prompt) - 1;
                    125:            while (isspace(prompt[len]) || prompt[len] == ':')
                    126:                prompt[len--] = '\0';
                    127:            easprintf(&s, "%s [echo on]: ", prompt);
                    128:            pass = auth_getpass(prompt, def_passwd_timeout * 60,
                    129:                SUDO_CONV_PROMPT_ECHO_ON);
                    130:            free(s);
                    131:        }
                    132:     }
                    133: 
                    134:     if (pass) {
                    135:        authok = auth_userresponse(as, pass, 1);
                    136:        zero_bytes(pass, strlen(pass));
                    137:     }
                    138: 
                    139:     /* restore old signal handler */
                    140:     (void) sigaction(SIGCHLD, &osa, NULL);
                    141: 
                    142:     if (authok)
                    143:        return AUTH_SUCCESS;
                    144: 
                    145:     if (!pass)
                    146:        return AUTH_INTR;
                    147: 
                    148:     if ((s = auth_getvalue(as, "errormsg")) != NULL)
                    149:        log_error(NO_EXIT|NO_MAIL, "%s", s);
                    150:     return AUTH_FAILURE;
                    151: }
                    152: 
                    153: int
                    154: bsdauth_cleanup(struct passwd *pw, sudo_auth *auth)
                    155: {
                    156:     auth_session_t *as = (auth_session_t *) auth->data;
                    157: 
                    158:     auth_close(as);
                    159: 
                    160:     return AUTH_SUCCESS;
                    161: }