Darren Tucker | c52a299 | 2004-02-06 16:38:16 +1100 | [diff] [blame] | 1 | /* $OpenBSD: auth.h,v 1.49 2004/01/30 09:48:57 markus 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 | |
Ben Lindstrom | 83647ce | 2001-06-25 04:30:16 +0000 | [diff] [blame] | 31 | #include "key.h" |
| 32 | #include "hostfile.h" |
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 { |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 50 | int success; |
Damien Miller | 8ce778a | 2003-05-14 13:43:25 +1000 | [diff] [blame] | 51 | int postponed; /* authentication needs another step */ |
| 52 | int valid; /* user exists and is allowed to login */ |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 53 | int attempt; |
| 54 | int failures; |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 55 | int force_pwchange; |
Damien Miller | 8ce778a | 2003-05-14 13:43:25 +1000 | [diff] [blame] | 56 | char *user; /* username sent by the client */ |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 57 | char *service; |
Damien Miller | 8ce778a | 2003-05-14 13:43:25 +1000 | [diff] [blame] | 58 | struct passwd *pw; /* set if 'valid' */ |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 59 | char *style; |
| 60 | void *kbdintctxt; |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 61 | #ifdef BSD_AUTH |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 62 | auth_session_t *as; |
| 63 | #endif |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 64 | #ifdef KRB5 |
| 65 | krb5_context krb5_ctx; |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 66 | krb5_ccache krb5_fwd_ccache; |
| 67 | krb5_principal krb5_user; |
| 68 | char *krb5_ticket_file; |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 69 | #endif |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 70 | void *methoddata; |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 71 | }; |
Damien Miller | 8ce778a | 2003-05-14 13:43:25 +1000 | [diff] [blame] | 72 | /* |
| 73 | * Every authentication method has to handle authentication requests for |
| 74 | * non-existing users, or for users that are not allowed to login. In this |
| 75 | * case 'valid' is set to 0, but 'user' points to the username requested by |
| 76 | * the client. |
| 77 | */ |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 78 | |
Ben Lindstrom | 511bb24 | 2002-06-06 20:52:37 +0000 | [diff] [blame] | 79 | struct Authmethod { |
| 80 | char *name; |
| 81 | int (*userauth)(Authctxt *authctxt); |
| 82 | int *enabled; |
| 83 | }; |
| 84 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 85 | /* |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 86 | * Keyboard interactive device: |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 87 | * init_ctx returns: non NULL upon success |
| 88 | * query returns: 0 - success, otherwise failure |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 89 | * respond returns: 0 - success, 1 - need further interaction, |
| 90 | * otherwise - failure |
| 91 | */ |
| 92 | struct KbdintDevice |
| 93 | { |
| 94 | const char *name; |
Damien Miller | b046211 | 2002-02-19 15:24:43 +1100 | [diff] [blame] | 95 | void* (*init_ctx)(Authctxt*); |
Damien Miller | a93c6d8 | 2002-02-19 15:25:29 +1100 | [diff] [blame] | 96 | int (*query)(void *ctx, char **name, char **infotxt, |
| 97 | u_int *numprompts, char ***prompts, u_int **echo_on); |
Damien Miller | b046211 | 2002-02-19 15:24:43 +1100 | [diff] [blame] | 98 | int (*respond)(void *ctx, u_int numresp, char **responses); |
| 99 | void (*free_ctx)(void *ctx); |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 100 | }; |
| 101 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 102 | int auth_rhosts(struct passwd *, const char *); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 103 | int |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 104 | auth_rhosts2(struct passwd *, const char *, const char *, const char *); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 105 | |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 106 | int auth_rhosts_rsa(Authctxt *, char *, Key *); |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 107 | int auth_password(Authctxt *, const char *); |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 108 | int auth_rsa(Authctxt *, BIGNUM *); |
Ben Lindstrom | 9c8aefe | 2002-03-22 01:12:58 +0000 | [diff] [blame] | 109 | int auth_rsa_challenge_dialog(Key *); |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 110 | BIGNUM *auth_rsa_generate_challenge(Key *); |
| 111 | int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); |
| 112 | int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); |
| 113 | |
| 114 | int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); |
| 115 | int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); |
| 116 | int user_key_allowed(struct passwd *, Key *); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 117 | |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 118 | #ifdef KRB5 |
Damien Miller | 25162f2 | 2002-09-12 09:47:29 +1000 | [diff] [blame] | 119 | int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 120 | int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); |
| 121 | int auth_krb5_password(Authctxt *authctxt, const char *password); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 122 | void krb5_cleanup_proc(Authctxt *authctxt); |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 123 | #endif /* KRB5 */ |
| 124 | |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 125 | #include "auth-pam.h" |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 126 | |
Darren Tucker | ec217ad | 2003-11-22 12:11:06 +1100 | [diff] [blame] | 127 | void do_authentication(Authctxt *); |
| 128 | void do_authentication2(Authctxt *); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 129 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 130 | void auth_log(Authctxt *, int, char *, char *); |
| 131 | void userauth_finish(Authctxt *, int, char *); |
| 132 | int auth_root_allowed(char *); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 133 | |
Damien Miller | 5ad9fd9 | 2002-05-13 11:07:41 +1000 | [diff] [blame] | 134 | char *auth2_read_banner(void); |
| 135 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 136 | void privsep_challenge_enable(void); |
| 137 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 138 | int auth2_challenge(Authctxt *, char *); |
Damien Miller | ee11625 | 2001-12-21 12:42:34 +1100 | [diff] [blame] | 139 | void auth2_challenge_stop(Authctxt *); |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 140 | int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); |
| 141 | int bsdauth_respond(void *, u_int, char **); |
| 142 | int skey_query(void *, char **, char **, u_int *, char ***, u_int **); |
| 143 | int skey_respond(void *, u_int, char **); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 144 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 145 | int allowed_user(struct passwd *); |
Ben Lindstrom | 2ae18f4 | 2002-03-22 01:24:38 +0000 | [diff] [blame] | 146 | struct passwd * getpwnamallow(const char *user); |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 147 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 148 | char *get_challenge(Authctxt *); |
| 149 | int verify_response(Authctxt *, const char *); |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 150 | void abandon_challenge_response(Authctxt *); |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 151 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 152 | char *expand_filename(const char *, struct passwd *); |
| 153 | char *authorized_keys_file(struct passwd *); |
| 154 | char *authorized_keys_file2(struct passwd *); |
Ben Lindstrom | bfb3a0e | 2001-06-05 20:25:05 +0000 | [diff] [blame] | 155 | |
Ben Lindstrom | bfb3a0e | 2001-06-05 20:25:05 +0000 | [diff] [blame] | 156 | int |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 157 | secure_filename(FILE *, const char *, struct passwd *, char *, size_t); |
Ben Lindstrom | bfb3a0e | 2001-06-05 20:25:05 +0000 | [diff] [blame] | 158 | |
Ben Lindstrom | 83647ce | 2001-06-25 04:30:16 +0000 | [diff] [blame] | 159 | HostStatus |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 160 | check_key_in_hostfiles(struct passwd *, Key *, const char *, |
| 161 | const char *, const char *); |
Ben Lindstrom | 83647ce | 2001-06-25 04:30:16 +0000 | [diff] [blame] | 162 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 163 | /* hostkey handling */ |
| 164 | Key *get_hostkey_by_index(int); |
| 165 | Key *get_hostkey_by_type(int); |
| 166 | int get_hostkey_index(Key *); |
| 167 | int ssh1_session_key(BIGNUM *); |
| 168 | |
Ben Lindstrom | a574cda | 2002-05-15 16:16:14 +0000 | [diff] [blame] | 169 | /* debug messages during authentication */ |
| 170 | void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
| 171 | void auth_debug_send(void); |
| 172 | void auth_debug_reset(void); |
| 173 | |
Damien Miller | 856f0be | 2003-09-03 07:32:45 +1000 | [diff] [blame] | 174 | struct passwd *fakepw(void); |
| 175 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 176 | #define AUTH_FAIL_MAX 6 |
| 177 | #define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2) |
| 178 | #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" |
| 179 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 180 | #define SKEY_PROMPT "\nS/Key Password: " |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 181 | #endif |