Damien Miller | 7cc194f | 2014-02-04 11:12:56 +1100 | [diff] [blame] | 1 | /* $OpenBSD: auth.h,v 1.77 2014/01/29 06:18:35 djm Exp $ */ |
Ben Lindstrom | 05764b9 | 2002-03-05 01:53:02 +0000 | [diff] [blame] | 2 | |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 3 | /* |
| 4 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 25 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 26 | */ |
Ben Lindstrom | 05764b9 | 2002-03-05 01:53:02 +0000 | [diff] [blame] | 27 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 28 | #ifndef AUTH_H |
| 29 | #define AUTH_H |
| 30 | |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 31 | #include <signal.h> |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 32 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 33 | #include <openssl/rsa.h> |
| 34 | |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 35 | #ifdef HAVE_LOGIN_CAP |
| 36 | #include <login_cap.h> |
| 37 | #endif |
| 38 | #ifdef BSD_AUTH |
| 39 | #include <bsd_auth.h> |
| 40 | #endif |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 41 | #ifdef KRB5 |
| 42 | #include <krb5.h> |
| 43 | #endif |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 44 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 45 | typedef struct Authctxt Authctxt; |
Ben Lindstrom | 511bb24 | 2002-06-06 20:52:37 +0000 | [diff] [blame] | 46 | typedef struct Authmethod Authmethod; |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 47 | typedef struct KbdintDevice KbdintDevice; |
| 48 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 49 | struct Authctxt { |
Damien Miller | 97c91f6 | 2006-04-23 12:08:37 +1000 | [diff] [blame] | 50 | sig_atomic_t success; |
Damien Miller | 3f8123c | 2006-08-19 00:32:46 +1000 | [diff] [blame] | 51 | int authenticated; /* authenticated and alarms cancelled */ |
Damien Miller | 8ce778a | 2003-05-14 13:43:25 +1000 | [diff] [blame] | 52 | int postponed; /* authentication needs another step */ |
| 53 | int valid; /* user exists and is allowed to login */ |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 54 | int attempt; |
| 55 | int failures; |
Damien Miller | b2da7d1 | 2011-05-05 14:04:50 +1000 | [diff] [blame] | 56 | int server_caused_failure; |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 57 | int force_pwchange; |
Damien Miller | 8ce778a | 2003-05-14 13:43:25 +1000 | [diff] [blame] | 58 | char *user; /* username sent by the client */ |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 59 | char *service; |
Damien Miller | 8ce778a | 2003-05-14 13:43:25 +1000 | [diff] [blame] | 60 | struct passwd *pw; /* set if 'valid' */ |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 61 | char *style; |
| 62 | void *kbdintctxt; |
Darren Tucker | 0acca37 | 2013-06-02 07:41:51 +1000 | [diff] [blame] | 63 | char *info; /* Extra info for next auth_log */ |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 64 | #ifdef BSD_AUTH |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 65 | auth_session_t *as; |
| 66 | #endif |
Damien Miller | a6e3f01 | 2012-11-04 23:21:40 +1100 | [diff] [blame] | 67 | char **auth_methods; /* modified from server config */ |
| 68 | u_int num_auth_methods; |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 69 | #ifdef KRB5 |
| 70 | krb5_context krb5_ctx; |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 71 | krb5_ccache krb5_fwd_ccache; |
| 72 | krb5_principal krb5_user; |
| 73 | char *krb5_ticket_file; |
Damien Miller | 9c870f9 | 2004-04-16 22:47:55 +1000 | [diff] [blame] | 74 | char *krb5_ccname; |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 75 | #endif |
Darren Tucker | f3bb434 | 2005-03-31 21:39:25 +1000 | [diff] [blame] | 76 | Buffer *loginmsg; |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 77 | void *methoddata; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 78 | }; |
Damien Miller | 8ce778a | 2003-05-14 13:43:25 +1000 | [diff] [blame] | 79 | /* |
| 80 | * Every authentication method has to handle authentication requests for |
| 81 | * non-existing users, or for users that are not allowed to login. In this |
| 82 | * case 'valid' is set to 0, but 'user' points to the username requested by |
| 83 | * the client. |
| 84 | */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 85 | |
Ben Lindstrom | 511bb24 | 2002-06-06 20:52:37 +0000 | [diff] [blame] | 86 | struct Authmethod { |
| 87 | char *name; |
| 88 | int (*userauth)(Authctxt *authctxt); |
| 89 | int *enabled; |
| 90 | }; |
| 91 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 92 | /* |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 93 | * Keyboard interactive device: |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 94 | * init_ctx returns: non NULL upon success |
| 95 | * query returns: 0 - success, otherwise failure |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 96 | * respond returns: 0 - success, 1 - need further interaction, |
| 97 | * otherwise - failure |
| 98 | */ |
| 99 | struct KbdintDevice |
| 100 | { |
| 101 | const char *name; |
Damien Miller | b046211 | 2002-02-19 15:24:43 +1100 | [diff] [blame] | 102 | void* (*init_ctx)(Authctxt*); |
Damien Miller | a93c6d8 | 2002-02-19 15:25:29 +1100 | [diff] [blame] | 103 | int (*query)(void *ctx, char **name, char **infotxt, |
| 104 | u_int *numprompts, char ***prompts, u_int **echo_on); |
Damien Miller | b046211 | 2002-02-19 15:24:43 +1100 | [diff] [blame] | 105 | int (*respond)(void *ctx, u_int numresp, char **responses); |
| 106 | void (*free_ctx)(void *ctx); |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 107 | }; |
| 108 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 109 | int auth_rhosts(struct passwd *, const char *); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 110 | int |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 111 | auth_rhosts2(struct passwd *, const char *, const char *, const char *); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 112 | |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 113 | int auth_rhosts_rsa(Authctxt *, char *, Key *); |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 114 | int auth_password(Authctxt *, const char *); |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 115 | int auth_rsa(Authctxt *, BIGNUM *); |
Ben Lindstrom | 9c8aefe | 2002-03-22 01:12:58 +0000 | [diff] [blame] | 116 | int auth_rsa_challenge_dialog(Key *); |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 117 | BIGNUM *auth_rsa_generate_challenge(Key *); |
| 118 | int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); |
| 119 | int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); |
| 120 | |
| 121 | int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); |
| 122 | int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); |
| 123 | int user_key_allowed(struct passwd *, Key *); |
Damien Miller | 20bdcd7 | 2013-07-18 16:10:09 +1000 | [diff] [blame] | 124 | void pubkey_auth_info(Authctxt *, const Key *, const char *, ...) |
| 125 | __attribute__((__format__ (printf, 3, 4))); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 126 | |
Damien Miller | 09d3e12 | 2012-10-31 08:58:58 +1100 | [diff] [blame] | 127 | struct stat; |
| 128 | int auth_secure_path(const char *, struct stat *, const char *, uid_t, |
| 129 | char *, size_t); |
| 130 | |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 131 | #ifdef KRB5 |
Damien Miller | 25162f2 | 2002-09-12 09:47:29 +1000 | [diff] [blame] | 132 | int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 133 | int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); |
| 134 | int auth_krb5_password(Authctxt *authctxt, const char *password); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 135 | void krb5_cleanup_proc(Authctxt *authctxt); |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 136 | #endif /* KRB5 */ |
| 137 | |
Darren Tucker | 15ee748 | 2004-02-22 09:43:15 +1100 | [diff] [blame] | 138 | #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) |
Darren Tucker | aa0aeca | 2004-02-22 10:22:05 +1100 | [diff] [blame] | 139 | #include <shadow.h> |
Darren Tucker | 15ee748 | 2004-02-22 09:43:15 +1100 | [diff] [blame] | 140 | int auth_shadow_acctexpired(struct spwd *); |
Darren Tucker | 9df3def | 2004-02-10 13:01:14 +1100 | [diff] [blame] | 141 | int auth_shadow_pwexpired(Authctxt *); |
| 142 | #endif |
| 143 | |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 144 | #include "auth-pam.h" |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 145 | #include "audit.h" |
Darren Tucker | 3c66080 | 2005-01-20 22:20:50 +1100 | [diff] [blame] | 146 | void remove_kbdint_device(const char *); |
| 147 | |
Darren Tucker | e3dba82 | 2004-02-10 12:50:19 +1100 | [diff] [blame] | 148 | void disable_forwarding(void); |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 149 | |
Darren Tucker | ec217ad | 2003-11-22 12:11:06 +1100 | [diff] [blame] | 150 | void do_authentication(Authctxt *); |
| 151 | void do_authentication2(Authctxt *); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 152 | |
Darren Tucker | 0acca37 | 2013-06-02 07:41:51 +1000 | [diff] [blame] | 153 | void auth_info(Authctxt *authctxt, const char *, ...) |
| 154 | __attribute__((__format__ (printf, 2, 3))) |
| 155 | __attribute__((__nonnull__ (2))); |
| 156 | void auth_log(Authctxt *, int, int, const char *, const char *); |
Damien Miller | 15b05cf | 2012-12-03 09:53:20 +1100 | [diff] [blame] | 157 | void userauth_finish(Authctxt *, int, const char *, const char *); |
| 158 | int auth_root_allowed(const char *); |
| 159 | |
Darren Tucker | 77fc29e | 2004-09-11 23:07:03 +1000 | [diff] [blame] | 160 | void userauth_send_banner(const char *); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 161 | |
Damien Miller | 5ad9fd9 | 2002-05-13 11:07:41 +1000 | [diff] [blame] | 162 | char *auth2_read_banner(void); |
Damien Miller | a6e3f01 | 2012-11-04 23:21:40 +1100 | [diff] [blame] | 163 | int auth2_methods_valid(const char *, int); |
Damien Miller | 91a55f2 | 2013-04-23 15:18:10 +1000 | [diff] [blame] | 164 | int auth2_update_methods_lists(Authctxt *, const char *, const char *); |
Damien Miller | a6e3f01 | 2012-11-04 23:21:40 +1100 | [diff] [blame] | 165 | int auth2_setup_methods_lists(Authctxt *); |
Damien Miller | 91a55f2 | 2013-04-23 15:18:10 +1000 | [diff] [blame] | 166 | int auth2_method_allowed(Authctxt *, const char *, const char *); |
Damien Miller | 5ad9fd9 | 2002-05-13 11:07:41 +1000 | [diff] [blame] | 167 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 168 | void privsep_challenge_enable(void); |
| 169 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 170 | int auth2_challenge(Authctxt *, char *); |
Damien Miller | ee11625 | 2001-12-21 12:42:34 +1100 | [diff] [blame] | 171 | void auth2_challenge_stop(Authctxt *); |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 172 | int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); |
| 173 | int bsdauth_respond(void *, u_int, char **); |
| 174 | int skey_query(void *, char **, char **, u_int *, char ***, u_int **); |
| 175 | int skey_respond(void *, u_int, char **); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 176 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 177 | int allowed_user(struct passwd *); |
Ben Lindstrom | 2ae18f4 | 2002-03-22 01:24:38 +0000 | [diff] [blame] | 178 | struct passwd * getpwnamallow(const char *user); |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 179 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 180 | char *get_challenge(Authctxt *); |
| 181 | int verify_response(Authctxt *, const char *); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 182 | void abandon_challenge_response(Authctxt *); |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 183 | |
Damien Miller | d8478b6 | 2011-05-29 21:39:36 +1000 | [diff] [blame] | 184 | char *expand_authorized_keys(const char *, struct passwd *pw); |
Damien Miller | 30da344 | 2010-05-10 11:58:03 +1000 | [diff] [blame] | 185 | char *authorized_principals_file(struct passwd *); |
Ben Lindstrom | bfb3a0e | 2001-06-05 20:25:05 +0000 | [diff] [blame] | 186 | |
Darren Tucker | 33c787f | 2008-07-02 22:37:30 +1000 | [diff] [blame] | 187 | FILE *auth_openkeyfile(const char *, struct passwd *, int); |
Damien Miller | 30da344 | 2010-05-10 11:58:03 +1000 | [diff] [blame] | 188 | FILE *auth_openprincipals(const char *, struct passwd *, int); |
Damien Miller | 1aed65e | 2010-03-04 21:53:35 +1100 | [diff] [blame] | 189 | int auth_key_is_revoked(Key *); |
Ben Lindstrom | bfb3a0e | 2001-06-05 20:25:05 +0000 | [diff] [blame] | 190 | |
Ben Lindstrom | 83647ce | 2001-06-25 04:30:16 +0000 | [diff] [blame] | 191 | HostStatus |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 192 | check_key_in_hostfiles(struct passwd *, Key *, const char *, |
| 193 | const char *, const char *); |
Ben Lindstrom | 83647ce | 2001-06-25 04:30:16 +0000 | [diff] [blame] | 194 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 195 | /* hostkey handling */ |
| 196 | Key *get_hostkey_by_index(int); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 197 | Key *get_hostkey_public_by_index(int); |
Damien Miller | 0a80ca1 | 2010-02-27 07:55:05 +1100 | [diff] [blame] | 198 | Key *get_hostkey_public_by_type(int); |
| 199 | Key *get_hostkey_private_by_type(int); |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 200 | int get_hostkey_index(Key *); |
| 201 | int ssh1_session_key(BIGNUM *); |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 202 | void sshd_hostkey_sign(Key *, Key *, u_char **, u_int *, u_char *, u_int); |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 203 | |
Ben Lindstrom | a574cda | 2002-05-15 16:16:14 +0000 | [diff] [blame] | 204 | /* debug messages during authentication */ |
| 205 | void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
| 206 | void auth_debug_send(void); |
| 207 | void auth_debug_reset(void); |
| 208 | |
Damien Miller | 856f0be | 2003-09-03 07:32:45 +1000 | [diff] [blame] | 209 | struct passwd *fakepw(void); |
| 210 | |
Darren Tucker | f3bb434 | 2005-03-31 21:39:25 +1000 | [diff] [blame] | 211 | int sys_auth_passwd(Authctxt *, const char *); |
| 212 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 213 | #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" |
| 214 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 215 | #define SKEY_PROMPT "\nS/Key Password: " |
Darren Tucker | a916d14 | 2005-07-07 11:50:20 +1000 | [diff] [blame] | 216 | |
| 217 | #if defined(KRB5) && !defined(HEIMDAL) |
| 218 | #include <krb5.h> |
| 219 | krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); |
| 220 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 221 | #endif |