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Annotation of embedaddon/sudo/plugins/sudoers/auth/sia.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (c) 1999-2005, 2007, 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:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
        !            17:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            18:  *
        !            19:  * Sponsored in part by the Defense Advanced Research Projects
        !            20:  * Agency (DARPA) and Air Force Research Laboratory, Air Force
        !            21:  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
        !            22:  */
        !            23: 
        !            24: #include <config.h>
        !            25: 
        !            26: #include <sys/types.h>
        !            27: #include <sys/param.h>
        !            28: #include <stdio.h>
        !            29: #ifdef STDC_HEADERS
        !            30: # include <stdlib.h>
        !            31: # include <stddef.h>
        !            32: #else
        !            33: # ifdef HAVE_STDLIB_H
        !            34: #  include <stdlib.h>
        !            35: # endif
        !            36: #endif /* STDC_HEADERS */
        !            37: #ifdef HAVE_STRING_H
        !            38: # include <string.h>
        !            39: #endif /* HAVE_STRING_H */
        !            40: #ifdef HAVE_STRINGS_H
        !            41: # include <strings.h>
        !            42: #endif /* HAVE_STRINGS_H */
        !            43: #ifdef HAVE_UNISTD_H
        !            44: # include <unistd.h>
        !            45: #endif /* HAVE_UNISTD_H */
        !            46: #include <pwd.h>
        !            47: #include <siad.h>
        !            48: 
        !            49: #include "sudoers.h"
        !            50: #include "sudo_auth.h"
        !            51: 
        !            52: static int sudo_collect(int, int, uchar_t *, int, prompt_t *);
        !            53: 
        !            54: static char *def_prompt;
        !            55: static char **sudo_argv;
        !            56: static int sudo_argc;
        !            57: 
        !            58: /*
        !            59:  * Collection routine (callback) for limiting the timeouts in SIA
        !            60:  * prompts and (possibly) setting a custom prompt.
        !            61:  */
        !            62: static int
        !            63: sudo_collect(int timeout, int rendition, uchar_t *title, int nprompts,
        !            64:     prompt_t *prompts)
        !            65: {
        !            66:     switch (rendition) {
        !            67:        case SIAFORM:
        !            68:        case SIAONELINER:
        !            69:            if (timeout <= 0 || timeout > def_passwd_timeout * 60)
        !            70:                timeout = def_passwd_timeout * 60;
        !            71:            /*
        !            72:             * Substitute custom prompt if a) the sudo prompt is not "Password:"
        !            73:             * and b) the SIA prompt is "Password:" (so we know it is safe).
        !            74:             * This keeps us from overwriting things like S/Key challenges.
        !            75:             */
        !            76:            if (strcmp((char *)prompts[0].prompt, "Password:") == 0 &&
        !            77:                strcmp(def_prompt, "Password:") != 0)
        !            78:                prompts[0].prompt = (unsigned char *)def_prompt;
        !            79:            break;
        !            80:        default:
        !            81:            break;
        !            82:     }
        !            83: 
        !            84:     return sia_collect_trm(timeout, rendition, title, nprompts, prompts);
        !            85: }
        !            86: 
        !            87: int
        !            88: sia_setup(struct passwd *pw, char **promptp, sudo_auth *auth)
        !            89: {
        !            90:     SIAENTITY *siah = NULL;
        !            91:     int i;
        !            92:     extern int NewArgc;
        !            93:     extern char **NewArgv;
        !            94: 
        !            95:     /* Rebuild argv for sia_ses_init() */
        !            96:     sudo_argc = NewArgc + 1;
        !            97:     sudo_argv = emalloc2(sudo_argc + 1, sizeof(char *));
        !            98:     sudo_argv[0] = "sudo";
        !            99:     for (i = 0; i < NewArgc; i++)
        !           100:        sudo_argv[i + 1] = NewArgv[i];
        !           101:     sudo_argv[sudo_argc] = NULL;
        !           102: 
        !           103:     if (sia_ses_init(&siah, sudo_argc, sudo_argv, NULL, pw->pw_name, user_ttypath, 1, NULL) != SIASUCCESS) {
        !           104: 
        !           105:        log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
        !           106:            _("unable to initialize SIA session"));
        !           107:        return AUTH_FATAL;
        !           108:     }
        !           109: 
        !           110:     auth->data = (void *) siah;
        !           111:     return AUTH_SUCCESS;
        !           112: }
        !           113: 
        !           114: int
        !           115: sia_verify(struct passwd *pw, char *prompt, sudo_auth *auth)
        !           116: {
        !           117:     SIAENTITY *siah = (SIAENTITY *) auth->data;
        !           118: 
        !           119:     def_prompt = prompt;               /* for sudo_collect */
        !           120: 
        !           121:     /* XXX - need a way to detect user hitting return or EOF at prompt */
        !           122:     if (sia_ses_reauthent(sudo_collect, siah) == SIASUCCESS)
        !           123:        return AUTH_SUCCESS;
        !           124:     else
        !           125:        return AUTH_FAILURE;
        !           126: }
        !           127: 
        !           128: int
        !           129: sia_cleanup(struct passwd *pw, sudo_auth *auth)
        !           130: {
        !           131:     SIAENTITY *siah = (SIAENTITY *) auth->data;
        !           132: 
        !           133:     (void) sia_ses_release(&siah);
        !           134:     efree(sudo_argv);
        !           135:     return AUTH_SUCCESS;
        !           136: }