Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
| 5 | * Created: Sat Mar 18 05:11:38 1995 ylo |
| 6 | * Password authentication. This file contains the functions to check whether |
| 7 | * the password is valid for the user. |
| 8 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 9 | |
| 10 | #include "includes.h" |
Damien Miller | dd1c7ba | 1999-11-19 15:53:20 +1100 | [diff] [blame] | 11 | |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 12 | #ifndef USE_PAM |
Damien Miller | dd1c7ba | 1999-11-19 15:53:20 +1100 | [diff] [blame] | 13 | |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 14 | RCSID("$Id: auth-passwd.c,v 1.18 2000/04/16 02:31:49 damien Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 15 | |
| 16 | #include "packet.h" |
| 17 | #include "ssh.h" |
| 18 | #include "servconf.h" |
| 19 | #include "xmalloc.h" |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 20 | |
Damien Miller | 1fa154b | 2000-01-23 10:32:03 +1100 | [diff] [blame] | 21 | #ifdef WITH_AIXAUTHENTICATE |
| 22 | #include <login.h> |
| 23 | #endif |
| 24 | |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 25 | #ifdef HAVE_SHADOW_H |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 26 | # include <shadow.h> |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 27 | #endif |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 28 | #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) |
| 29 | # include "md5crypt.h" |
| 30 | #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ |
Damien Miller | dd1c7ba | 1999-11-19 15:53:20 +1100 | [diff] [blame] | 31 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 32 | /* |
| 33 | * Tries to authenticate the user using password. Returns true if |
| 34 | * authentication succeeds. |
| 35 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 36 | int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 37 | auth_password(struct passwd * pw, const char *password) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 38 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 39 | extern ServerOptions options; |
| 40 | char *encrypted_password; |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 41 | char *pw_password; |
| 42 | char *salt; |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 43 | #ifdef HAVE_SHADOW_H |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 44 | struct spwd *spw; |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 45 | #endif |
Damien Miller | 1fa154b | 2000-01-23 10:32:03 +1100 | [diff] [blame] | 46 | #ifdef WITH_AIXAUTHENTICATE |
| 47 | char *authmsg; |
| 48 | char *loginmsg; |
| 49 | int reenter = 1; |
| 50 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 51 | |
Damien Miller | ece22a8 | 1999-12-30 09:48:15 +1100 | [diff] [blame] | 52 | /* deny if no user. */ |
| 53 | if (pw == NULL) |
| 54 | return 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 55 | if (pw->pw_uid == 0 && options.permit_root_login == 2) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 56 | return 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 57 | if (*password == '\0' && options.permit_empty_passwd == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 58 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 59 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 60 | #ifdef SKEY |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 61 | if (options.skey_authentication == 1) { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 62 | int ret = auth_skey_password(pw, password); |
| 63 | if (ret == 1 || ret == 0) |
| 64 | return ret; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 65 | /* Fall back to ordinary passwd authentication. */ |
| 66 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 67 | #endif |
Damien Miller | 1fa154b | 2000-01-23 10:32:03 +1100 | [diff] [blame] | 68 | |
| 69 | #ifdef WITH_AIXAUTHENTICATE |
| 70 | return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); |
| 71 | #endif |
| 72 | |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 73 | #ifdef KRB4 |
| 74 | if (options.kerberos_authentication == 1) { |
| 75 | int ret = auth_krb4_password(pw, password); |
| 76 | if (ret == 1 || ret == 0) |
| 77 | return ret; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 78 | /* Fall back to ordinary passwd authentication. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | } |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 80 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 81 | |
| 82 | /* Check for users with no password. */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 83 | if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 84 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 86 | pw_password = pw->pw_passwd; |
| 87 | |
Damien Miller | cb7e5f9 | 1999-12-21 21:03:09 +1100 | [diff] [blame] | 88 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 89 | spw = getspnam(pw->pw_name); |
Damien Miller | 8eb0fd6 | 1999-12-31 08:49:13 +1100 | [diff] [blame] | 90 | if (spw != NULL) |
| 91 | { |
| 92 | /* Check for users with no password. */ |
| 93 | if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0) |
| 94 | return 1; |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 95 | |
Damien Miller | 8eb0fd6 | 1999-12-31 08:49:13 +1100 | [diff] [blame] | 96 | pw_password = spw->sp_pwdp; |
| 97 | } |
Damien Miller | cb7e5f9 | 1999-12-21 21:03:09 +1100 | [diff] [blame] | 98 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 99 | |
| 100 | if (pw_password[0] != '\0') |
| 101 | salt = pw_password; |
| 102 | else |
| 103 | salt = "xx"; |
| 104 | |
| 105 | #ifdef HAVE_MD5_PASSWORDS |
| 106 | if (is_md5_salt(salt)) |
| 107 | encrypted_password = md5_crypt(password, salt); |
| 108 | else |
| 109 | encrypted_password = crypt(password, salt); |
| 110 | #else /* HAVE_MD5_PASSWORDS */ |
| 111 | encrypted_password = crypt(password, salt); |
| 112 | #endif /* HAVE_MD5_PASSWORDS */ |
| 113 | |
| 114 | /* Authentication is accepted if the encrypted passwords are identical. */ |
| 115 | return (strcmp(encrypted_password, pw_password) == 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 116 | } |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 117 | #endif /* !USE_PAM */ |