1/* 2 * Copyright (c) 1994-1996, 1998-2005, 2010 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_STRINGS_H */ 41#ifdef HAVE_UNISTD_H 42# include <unistd.h> 43#endif /* HAVE_UNISTD_H */ 44#include <pwd.h> 45 46#if defined(HAVE_SKEY) 47# include <skey.h> 48# define RFC1938 skey 49# ifdef HAVE_RFC1938_SKEYCHALLENGE 50# define rfc1938challenge(a,b,c,d) skeychallenge((a),(b),(c),(d)) 51# else 52# define rfc1938challenge(a,b,c,d) skeychallenge((a),(b),(c)) 53# endif 54# define rfc1938verify(a,b) skeyverify((a),(b)) 55#elif defined(HAVE_OPIE) 56# include <opie.h> 57# define RFC1938 opie 58# define rfc1938challenge(a,b,c,d) opiechallenge((a),(b),(c)) 59# define rfc1938verify(a,b) opieverify((a),(b)) 60#endif 61 62#include "sudo.h" 63#include "sudo_auth.h" 64 65int 66rfc1938_setup(pw, promptp, auth) 67 struct passwd *pw; 68 char **promptp; 69 sudo_auth *auth; 70{ 71 char challenge[256]; 72 static char *orig_prompt = NULL, *new_prompt = NULL; 73 static int op_len, np_size; 74 static struct RFC1938 rfc1938; 75 76 /* Stash a pointer to the rfc1938 struct if we have not initialized */ 77 if (!auth->data) 78 auth->data = &rfc1938; 79 80 /* Save the original prompt */ 81 if (orig_prompt == NULL) { 82 orig_prompt = *promptp; 83 op_len = strlen(orig_prompt); 84 85 /* Ignore trailing colon (we will add our own) */ 86 if (orig_prompt[op_len - 1] == ':') 87 op_len--; 88 else if (op_len >= 2 && orig_prompt[op_len - 1] == ' ' 89 && orig_prompt[op_len - 2] == ':') 90 op_len -= 2; 91 } 92 93#ifdef HAVE_SKEY 94 /* Close old stream */ 95 if (rfc1938.keyfile) 96 (void) fclose(rfc1938.keyfile); 97#endif 98 99 /* 100 * Look up the user and get the rfc1938 challenge. 101 * If the user is not in the OTP db, only post a fatal error if 102 * we are running alone (since they may just use a normal passwd). 103 */ 104 if (rfc1938challenge(&rfc1938, pw->pw_name, challenge, sizeof(challenge))) { 105 if (IS_ONEANDONLY(auth)) { 106 warningx("you do not exist in the %s database", auth->name); 107 return AUTH_FATAL; 108 } else { 109 return AUTH_FAILURE; 110 } 111 } 112 113 /* Get space for new prompt with embedded challenge */ 114 if (np_size < op_len + strlen(challenge) + 7) { 115 np_size = op_len + strlen(challenge) + 7; 116 new_prompt = (char *) erealloc(new_prompt, np_size); 117 } 118 119 if (def_long_otp_prompt) 120 (void) snprintf(new_prompt, np_size, "%s\n%s", challenge, orig_prompt); 121 else 122 (void) snprintf(new_prompt, np_size, "%.*s [ %s ]:", op_len, 123 orig_prompt, challenge); 124 125 *promptp = new_prompt; 126 return AUTH_SUCCESS; 127} 128 129int 130rfc1938_verify(pw, pass, auth) 131 struct passwd *pw; 132 char *pass; 133 sudo_auth *auth; 134{ 135 136 if (rfc1938verify((struct RFC1938 *) auth->data, pass) == 0) 137 return AUTH_SUCCESS; 138 else 139 return AUTH_FAILURE; 140} 141