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Annotation of embedaddon/sudo/plugins/sudoers/auth/rfc1938.c, revision 1.1.1.3

1.1       misho       1: /*
1.1.1.3 ! misho       2:  * Copyright (c) 1994-1996, 1998-2005, 2010-2012
1.1       misho       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 <stdio.h>
                     26: #ifdef STDC_HEADERS
                     27: # include <stdlib.h>
                     28: # include <stddef.h>
                     29: #else
                     30: # ifdef HAVE_STDLIB_H
                     31: #  include <stdlib.h>
                     32: # endif
                     33: #endif /* STDC_HEADERS */
                     34: #ifdef HAVE_STRING_H
                     35: # include <string.h>
                     36: #endif /* HAVE_STRING_H */
                     37: #ifdef HAVE_STRINGS_H
                     38: # include <strings.h>
                     39: #endif /* HAVE_STRINGS_H */
                     40: #ifdef HAVE_UNISTD_H
                     41: # include <unistd.h>
                     42: #endif /* HAVE_UNISTD_H */
                     43: #include <pwd.h>
                     44: 
                     45: #if defined(HAVE_SKEY)
                     46: # include <skey.h>
                     47: # define RFC1938                               skey
                     48: #  ifdef HAVE_RFC1938_SKEYCHALLENGE
                     49: #   define rfc1938challenge(a,b,c,d)   skeychallenge((a),(b),(c),(d))
                     50: #  else
                     51: #   define rfc1938challenge(a,b,c,d)   skeychallenge((a),(b),(c))
                     52: #  endif
                     53: # define rfc1938verify(a,b)            skeyverify((a),(b))
                     54: #elif defined(HAVE_OPIE)
                     55: # include <opie.h>
                     56: # define RFC1938                       opie
                     57: # define rfc1938challenge(a,b,c,d)     opiechallenge((a),(b),(c))
                     58: # define rfc1938verify(a,b)            opieverify((a),(b))
                     59: #endif
                     60: 
                     61: #include "sudoers.h"
                     62: #include "sudo_auth.h"
                     63: 
                     64: int
1.1.1.2   misho      65: sudo_rfc1938_setup(struct passwd *pw, char **promptp, sudo_auth *auth)
1.1       misho      66: {
                     67:     char challenge[256];
                     68:     static char *orig_prompt = NULL, *new_prompt = NULL;
                     69:     static int op_len, np_size;
                     70:     static struct RFC1938 rfc1938;
1.1.1.2   misho      71:     debug_decl(sudo_rfc1938_setup, SUDO_DEBUG_AUTH)
1.1       misho      72: 
                     73:     /* Stash a pointer to the rfc1938 struct if we have not initialized */
                     74:     if (!auth->data)
                     75:        auth->data = &rfc1938;
                     76: 
                     77:     /* Save the original prompt */
                     78:     if (orig_prompt == NULL) {
                     79:        orig_prompt = *promptp;
                     80:        op_len = strlen(orig_prompt);
                     81: 
                     82:        /* Ignore trailing colon (we will add our own) */
                     83:        if (orig_prompt[op_len - 1] == ':')
                     84:            op_len--;
                     85:        else if (op_len >= 2 && orig_prompt[op_len - 1] == ' '
                     86:            && orig_prompt[op_len - 2] == ':')
                     87:            op_len -= 2;
                     88:     }
                     89: 
                     90: #ifdef HAVE_SKEY
                     91:     /* Close old stream */
                     92:     if (rfc1938.keyfile)
                     93:        (void) fclose(rfc1938.keyfile);
                     94: #endif
                     95: 
                     96:     /*
                     97:      * Look up the user and get the rfc1938 challenge.
                     98:      * If the user is not in the OTP db, only post a fatal error if
                     99:      * we are running alone (since they may just use a normal passwd).
                    100:      */
                    101:     if (rfc1938challenge(&rfc1938, pw->pw_name, challenge, sizeof(challenge))) {
                    102:        if (IS_ONEANDONLY(auth)) {
                    103:            warningx(_("you do not exist in the %s database"), auth->name);
1.1.1.2   misho     104:            debug_return_int(AUTH_FATAL);
1.1       misho     105:        } else {
1.1.1.2   misho     106:            debug_return_int(AUTH_FAILURE);
1.1       misho     107:        }
                    108:     }
                    109: 
                    110:     /* Get space for new prompt with embedded challenge */
                    111:     if (np_size < op_len + strlen(challenge) + 7) {
                    112:        np_size = op_len + strlen(challenge) + 7;
                    113:        new_prompt = (char *) erealloc(new_prompt, np_size);
                    114:     }
                    115: 
                    116:     if (def_long_otp_prompt)
                    117:        (void) snprintf(new_prompt, np_size, "%s\n%s", challenge, orig_prompt);
                    118:     else
                    119:        (void) snprintf(new_prompt, np_size, "%.*s [ %s ]:", op_len,
                    120:            orig_prompt, challenge);
                    121: 
                    122:     *promptp = new_prompt;
1.1.1.2   misho     123:     debug_return_int(AUTH_SUCCESS);
1.1       misho     124: }
                    125: 
                    126: int
1.1.1.2   misho     127: sudo_rfc1938_verify(struct passwd *pw, char *pass, sudo_auth *auth)
1.1       misho     128: {
1.1.1.2   misho     129:     debug_decl(sudo_rfc1938_verify, SUDO_DEBUG_AUTH)
1.1       misho     130: 
                    131:     if (rfc1938verify((struct RFC1938 *) auth->data, pass) == 0)
1.1.1.2   misho     132:        debug_return_int(AUTH_SUCCESS);
1.1       misho     133:     else
1.1.1.2   misho     134:        debug_return_int(AUTH_FAILURE);
1.1       misho     135: }