1 /* $OpenBSD: skeyinfo.c,v 1.9 2001/06/19 01:49:45 millert Exp $ */ 2 3 /* 4 * Copyright (c) 1997, 2001 Todd C. Miller <Todd.Miller@courtesan.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <err.h> 31 #include <pwd.h> 32 #include <stdio.h> 33 #include <string.h> 34 #include <unistd.h> 35 #include <skey.h> 36 #include <login_cap.h> 37 #include <bsd_auth.h> 38 39 extern char *__progname; 40 41 void usage(void); 42 43 int 44 main(int argc, char **argv) 45 { 46 struct passwd *pw; 47 char *style, *challenge, *cp, *name; 48 int ch, verbose = 0; 49 login_cap_t *lc; 50 auth_session_t *as; 51 52 name = NULL; 53 style = "skey"; 54 while ((ch = getopt(argc, argv, "a:v")) != -1) 55 switch(ch) { 56 case 'a': 57 style = optarg; 58 break; 59 case 'v': 60 verbose = 1; 61 break; 62 default: 63 usage(); 64 } 65 argc -= optind; 66 argv += optind; 67 68 if (argc == 1) 69 name = argv[0]; 70 else if (argc > 1) 71 usage(); 72 73 if (name && getuid() != 0) 74 errx(1, "only root may specify an alternate user"); 75 76 if (name) { 77 if ((pw = getpwnam(name)) == NULL) 78 errx(1, "no passwd entry for %s", name); 79 } else { 80 if ((pw = getpwuid(getuid())) == NULL) 81 errx(1, "no passwd entry for uid %u", getuid()); 82 } 83 84 if ((name = strdup(pw->pw_name)) == NULL) 85 err(1, "cannot allocate memory"); 86 87 if ((lc = login_getclass(pw->pw_class)) == NULL) 88 errx(1, "unable to classify user %s", name); 89 90 if ((cp = login_getstyle(lc, style, NULL)) == NULL) 91 errx(1, "unknown authentication method %s", style); 92 93 as = auth_userchallenge(name, cp, NULL, &challenge); 94 if (as == NULL || challenge == NULL) { 95 if (as) 96 auth_close(as); 97 errx(1, "unable to retrieve challenge for %s", name); 98 } 99 100 /* 101 * We only want the first line of the challenge so stop after a newline. 102 * If the user wants the full challenge including the hash type 103 * or if the challenge didn't start with 'otp-', print it verbatim. 104 * Otherwise, strip off the first word. 105 */ 106 if ((cp = strchr(challenge, '\n'))) 107 *cp = '\0'; 108 cp = strchr(challenge, ' '); 109 if (verbose || *challenge != 'o' || !cp) 110 cp = challenge; 111 else 112 cp++; 113 puts(cp); 114 115 auth_close(as); 116 exit(0); 117 } 118 119 void 120 usage(void) 121 { 122 123 (void)fprintf(stderr, "Usage: %s [-a auth-type] [-v] [user]\n", 124 __progname); 125 exit(1); 126 } 127