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 | dfc83f4 | 2000-05-20 15:02:59 +1000 | [diff] [blame] | 14 | RCSID("$Id: auth-passwd.c,v 1.20 2000/05/20 05:03:00 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 |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 22 | # include <login.h> |
Damien Miller | 1fa154b | 2000-01-23 10:32:03 +1100 | [diff] [blame] | 23 | #endif |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 24 | #ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW |
| 25 | # include <hpsecurity.h> |
| 26 | # include <prot.h> |
| 27 | #endif |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 28 | #ifdef HAVE_SHADOW_H |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 29 | # include <shadow.h> |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 30 | #endif |
Damien Miller | dfc83f4 | 2000-05-20 15:02:59 +1000 | [diff] [blame] | 31 | #ifdef HAVE_GETPWANAM |
| 32 | # include <sys/label.h> |
| 33 | # include <sys/audit.h> |
| 34 | # include <pwdadj.h> |
| 35 | #endif |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 36 | #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) |
| 37 | # include "md5crypt.h" |
| 38 | #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ |
Damien Miller | dd1c7ba | 1999-11-19 15:53:20 +1100 | [diff] [blame] | 39 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 40 | /* |
| 41 | * Tries to authenticate the user using password. Returns true if |
| 42 | * authentication succeeds. |
| 43 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 44 | int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 45 | auth_password(struct passwd * pw, const char *password) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 46 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 47 | extern ServerOptions options; |
| 48 | char *encrypted_password; |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 49 | char *pw_password; |
| 50 | char *salt; |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 51 | #ifdef HAVE_SHADOW_H |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 52 | struct spwd *spw; |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 53 | #endif |
Damien Miller | dfc83f4 | 2000-05-20 15:02:59 +1000 | [diff] [blame] | 54 | #ifdef HAVE_GETPWANAM |
| 55 | struct passwd_adjunct *spw; |
| 56 | #endif |
Damien Miller | 1fa154b | 2000-01-23 10:32:03 +1100 | [diff] [blame] | 57 | #ifdef WITH_AIXAUTHENTICATE |
| 58 | char *authmsg; |
| 59 | char *loginmsg; |
| 60 | int reenter = 1; |
| 61 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 62 | |
Damien Miller | ece22a8 | 1999-12-30 09:48:15 +1100 | [diff] [blame] | 63 | /* deny if no user. */ |
| 64 | if (pw == NULL) |
| 65 | return 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 66 | if (pw->pw_uid == 0 && options.permit_root_login == 2) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 67 | return 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 68 | if (*password == '\0' && options.permit_empty_passwd == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 69 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 70 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 71 | #ifdef SKEY |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 72 | if (options.skey_authentication == 1) { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 73 | int ret = auth_skey_password(pw, password); |
| 74 | if (ret == 1 || ret == 0) |
| 75 | return ret; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 76 | /* Fall back to ordinary passwd authentication. */ |
| 77 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 78 | #endif |
Damien Miller | 1fa154b | 2000-01-23 10:32:03 +1100 | [diff] [blame] | 79 | |
| 80 | #ifdef WITH_AIXAUTHENTICATE |
| 81 | return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); |
| 82 | #endif |
| 83 | |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 84 | #ifdef KRB4 |
| 85 | if (options.kerberos_authentication == 1) { |
| 86 | int ret = auth_krb4_password(pw, password); |
| 87 | if (ret == 1 || ret == 0) |
| 88 | return ret; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 89 | /* Fall back to ordinary passwd authentication. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 90 | } |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 91 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 92 | |
| 93 | /* Check for users with no password. */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 94 | if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 95 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 96 | |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 97 | pw_password = pw->pw_passwd; |
| 98 | |
Damien Miller | cb7e5f9 | 1999-12-21 21:03:09 +1100 | [diff] [blame] | 99 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 100 | spw = getspnam(pw->pw_name); |
Damien Miller | 8eb0fd6 | 1999-12-31 08:49:13 +1100 | [diff] [blame] | 101 | if (spw != NULL) |
| 102 | { |
| 103 | /* Check for users with no password. */ |
| 104 | if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0) |
| 105 | return 1; |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 106 | |
Damien Miller | 8eb0fd6 | 1999-12-31 08:49:13 +1100 | [diff] [blame] | 107 | pw_password = spw->sp_pwdp; |
| 108 | } |
Damien Miller | cb7e5f9 | 1999-12-21 21:03:09 +1100 | [diff] [blame] | 109 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ |
Damien Miller | dfc83f4 | 2000-05-20 15:02:59 +1000 | [diff] [blame] | 110 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
| 111 | if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) |
| 112 | { |
| 113 | /* Check for users with no password. */ |
| 114 | if (strcmp(password, "") == 0 && strcmp(spw->pwa_passwd, "") == 0) |
| 115 | return 1; |
| 116 | |
| 117 | pw_password = spw->pwa_passwd; |
| 118 | } |
| 119 | #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 120 | |
| 121 | if (pw_password[0] != '\0') |
| 122 | salt = pw_password; |
| 123 | else |
| 124 | salt = "xx"; |
| 125 | |
| 126 | #ifdef HAVE_MD5_PASSWORDS |
| 127 | if (is_md5_salt(salt)) |
| 128 | encrypted_password = md5_crypt(password, salt); |
| 129 | else |
| 130 | encrypted_password = crypt(password, salt); |
| 131 | #else /* HAVE_MD5_PASSWORDS */ |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 132 | # ifdef HAVE_HPUX_TRUSTED_SYSTEM_PW |
| 133 | encrypted_password = bigcrypt(password, salt); |
| 134 | # else |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 135 | encrypted_password = crypt(password, salt); |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 136 | # endif /* HAVE_HPUX_TRUSTED_SYSTEM_PW */ |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 137 | #endif /* HAVE_MD5_PASSWORDS */ |
| 138 | |
| 139 | /* Authentication is accepted if the encrypted passwords are identical. */ |
| 140 | return (strcmp(encrypted_password, pw_password) == 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 141 | } |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 142 | #endif /* !USE_PAM */ |