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

1.1       misho       1: /*
                      2:  * Copyright (c) 1999-2005, 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 <pwd.h>
                     45: 
                     46: #include <auth.h>
                     47: #include <firewall.h>
                     48: 
                     49: #include "sudoers.h"
                     50: #include "sudo_auth.h"
                     51: 
                     52: int
                     53: fwtk_init(struct passwd *pw, sudo_auth *auth)
                     54: {
                     55:     static Cfg *confp;                 /* Configuration entry struct */
                     56:     char resp[128];                    /* Response from the server */
                     57: 
                     58:     if ((confp = cfg_read("sudo")) == (Cfg *)-1) {
                     59:        warningx(_("unable to read fwtk config"));
                     60:        return AUTH_FATAL;
                     61:     }
                     62: 
                     63:     if (auth_open(confp)) {
                     64:        warningx(_("unable to connect to authentication server"));
                     65:        return AUTH_FATAL;
                     66:     }
                     67: 
                     68:     /* Get welcome message from auth server */
                     69:     if (auth_recv(resp, sizeof(resp))) {
                     70:        warningx(_("lost connection to authentication server"));
                     71:        return AUTH_FATAL;
                     72:     }
                     73:     if (strncmp(resp, "Authsrv ready", 13) != 0) {
                     74:        warningx(_("authentication server error:\n%s"), resp);
                     75:        return AUTH_FATAL;
                     76:     }
                     77: 
                     78:     return AUTH_SUCCESS;
                     79: }
                     80: 
                     81: int
                     82: fwtk_verify(struct passwd *pw, char *prompt, sudo_auth *auth)
                     83: {
                     84:     char *pass;                                /* Password from the user */
                     85:     char buf[SUDO_PASS_MAX + 12];      /* General prupose buffer */
                     86:     char resp[128];                    /* Response from the server */
                     87:     int error;
                     88: 
                     89:     /* Send username to authentication server. */
                     90:     (void) snprintf(buf, sizeof(buf), "authorize %s 'sudo'", pw->pw_name);
                     91: restart:
                     92:     if (auth_send(buf) || auth_recv(resp, sizeof(resp))) {
                     93:        warningx(_("lost connection to authentication server"));
                     94:        return AUTH_FATAL;
                     95:     }
                     96: 
                     97:     /* Get the password/response from the user. */
                     98:     if (strncmp(resp, "challenge ", 10) == 0) {
                     99:        (void) snprintf(buf, sizeof(buf), "%s\nResponse: ", &resp[10]);
                    100:        pass = auth_getpass(buf, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF);
                    101:        if (pass && *pass == '\0') {
                    102:            pass = auth_getpass("Response [echo on]: ",
                    103:                def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_ON);
                    104:        }
                    105:     } else if (strncmp(resp, "chalnecho ", 10) == 0) {
                    106:        pass = auth_getpass(&resp[10], def_passwd_timeout * 60,
                    107:            SUDO_CONV_PROMPT_ECHO_OFF);
                    108:     } else if (strncmp(resp, "password", 8) == 0) {
                    109:        pass = auth_getpass(prompt, def_passwd_timeout * 60,
                    110:            SUDO_CONV_PROMPT_ECHO_OFF);
                    111:     } else if (strncmp(resp, "display ", 8) == 0) {
                    112:        fprintf(stderr, "%s\n", &resp[8]);
                    113:        strlcpy(buf, "response dummy", sizeof(buf));
                    114:        goto restart;
                    115:     } else {
                    116:        warningx("%s", resp);
                    117:        return AUTH_FATAL;
                    118:     }
                    119:     if (!pass) {                       /* ^C or error */
                    120:        return AUTH_INTR;
                    121:     }
                    122: 
                    123:     /* Send the user's response to the server */
                    124:     (void) snprintf(buf, sizeof(buf), "response '%s'", pass);
                    125:     if (auth_send(buf) || auth_recv(resp, sizeof(resp))) {
                    126:        warningx(_("lost connection to authentication server"));
                    127:        error = AUTH_FATAL;
                    128:        goto done;
                    129:     }
                    130: 
                    131:     if (strncmp(resp, "ok", 2) == 0) {
                    132:        error = AUTH_SUCCESS;
                    133:        goto done;
                    134:     }
                    135: 
                    136:     /* Main loop prints "Permission Denied" or insult. */
                    137:     if (strcmp(resp, "Permission Denied.") != 0)
                    138:        warningx("%s", resp);
                    139:     error = AUTH_FAILURE;
                    140: done:
                    141:     zero_bytes(pass, strlen(pass));
                    142:     zero_bytes(buf, strlen(buf));
                    143:     return error;
                    144: }
                    145: 
                    146: int
                    147: fwtk_cleanup(struct passwd *pw, sudo_auth *auth)
                    148: {
                    149: 
                    150:     auth_close();
                    151:     return AUTH_SUCCESS;
                    152: }