1 /*- 2 * Copyright (c) 2010 Alistair Crooks <agc@NetBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 #include <sys/types.h> 26 27 #include <netdb.h> 28 29 #include <netpgp.h> 30 #include <regex.h> 31 #include <sha1.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <time.h> 36 #include <unistd.h> 37 38 #include "libpaa.h" 39 40 #define DEFAULT_HASH_ALG "SHA256" 41 42 int 43 main(int argc, char **argv) 44 { 45 paa_server_info_t server; 46 paa_challenge_t challenge; 47 paa_identity_t id; 48 netpgp_t netpgp; 49 char buf[2048]; 50 int secretc; 51 int cc; 52 int i; 53 54 (void) memset(&server, 0x0, sizeof(server)); 55 (void) memset(&challenge, 0x0, sizeof(challenge)); 56 (void) memset(&id, 0x0, sizeof(id)); 57 (void) memset(&netpgp, 0x0, sizeof(netpgp)); 58 secretc = 64; 59 while ((i = getopt(argc, argv, "S:c:d:r:u:")) != -1) { 60 switch(i) { 61 case 'S': 62 netpgp_setvar(&netpgp, "ssh keys", "1"); 63 netpgp_setvar(&netpgp, "sshkeyfile", optarg); 64 break; 65 case 'c': 66 secretc = atoi(optarg); 67 break; 68 case 'd': 69 challenge.domain = optarg; 70 break; 71 case 'r': 72 challenge.realm = optarg; 73 break; 74 case 'u': 75 netpgp_setvar(&netpgp, "userid", optarg); 76 break; 77 } 78 } 79 netpgp_setvar(&netpgp, "hash", DEFAULT_HASH_ALG); 80 netpgp_setvar(&netpgp, "need seckey", "1"); 81 netpgp_setvar(&netpgp, "need userid", "1"); 82 netpgp_set_homedir(&netpgp, getenv("HOME"), 83 netpgp_getvar(&netpgp, "ssh keys") ? "/.ssh" : "/.gnupg", 1); 84 if (!netpgp_init(&netpgp)) { 85 (void) fprintf(stderr, "can't initialise netpgp\n"); 86 exit(EXIT_FAILURE); 87 } 88 if (!paa_server_init(&server, secretc)) { 89 (void) fprintf(stderr, "can't initialise paa server\n"); 90 exit(EXIT_FAILURE); 91 } 92 /* format the challenge */ 93 cc = paa_format_challenge(&challenge, &server, buf, sizeof(buf)); 94 /* write challenge to temp file */ 95 paa_write_file("challenge", buf, cc); 96 /* get the client to authenticate via paa, writing to temp response file */ 97 system("client/paaclient -r authentication@bigco.com < challenge > response"); 98 /* read in response */ 99 cc = paa_read_file("response", buf, sizeof(buf)); 100 if (!paa_check_response(&challenge, &id, &netpgp, buf)) { 101 (void) fprintf(stderr, "server: paa_check failed\n"); 102 exit(EXIT_FAILURE); 103 } 104 printf("paa_check_response verified challenge: signature authenticated:\n"); 105 paa_print_identity(stdout, &id); 106 printf("Changing buf[%d] from '%c' to '%c'\n", cc / 2, buf[cc / 2], buf[cc / 2] - 1); 107 buf[cc / 2] = buf[cc / 2] - 1; 108 if (paa_check_response(&challenge, &id, &netpgp, buf)) { 109 (void) fprintf(stderr, "server: unexpected paa_check pass\n"); 110 exit(EXIT_FAILURE); 111 } 112 printf("paa_check_response verified challenge: signature not authenticated:\n"); 113 exit(EXIT_SUCCESS); 114 } 115