Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
| 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Ben Lindstrom | 4dccfa5 | 2000-12-28 16:40:05 +0000 | [diff] [blame] | 23 | * |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 24 | * $OpenBSD: auth.h,v 1.21 2001/06/26 16:15:23 dugsong Exp $ |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 25 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 26 | #ifndef AUTH_H |
| 27 | #define AUTH_H |
| 28 | |
Ben Lindstrom | 83647ce | 2001-06-25 04:30:16 +0000 | [diff] [blame] | 29 | #include "key.h" |
| 30 | #include "hostfile.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 31 | #include <openssl/rsa.h> |
| 32 | |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 33 | #ifdef HAVE_LOGIN_CAP |
| 34 | #include <login_cap.h> |
| 35 | #endif |
| 36 | #ifdef BSD_AUTH |
| 37 | #include <bsd_auth.h> |
| 38 | #endif |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 39 | #ifdef KRB5 |
| 40 | #include <krb5.h> |
| 41 | #endif |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 42 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 43 | typedef struct Authctxt Authctxt; |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 44 | typedef struct KbdintDevice KbdintDevice; |
| 45 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 46 | struct Authctxt { |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 47 | int success; |
| 48 | int postponed; |
| 49 | int valid; |
| 50 | int attempt; |
| 51 | int failures; |
| 52 | char *user; |
| 53 | char *service; |
| 54 | struct passwd *pw; |
| 55 | char *style; |
| 56 | void *kbdintctxt; |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 57 | #ifdef BSD_AUTH |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 58 | auth_session_t *as; |
| 59 | #endif |
| 60 | #ifdef KRB4 |
| 61 | char *krb4_ticket_file; |
| 62 | #endif |
| 63 | #ifdef KRB5 |
| 64 | krb5_context krb5_ctx; |
| 65 | krb5_auth_context krb5_auth_ctx; |
| 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 |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 70 | }; |
| 71 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 72 | /* |
Ben Lindstrom | 551ea37 | 2001-06-05 18:56:16 +0000 | [diff] [blame] | 73 | * Keyboard interactive device: |
| 74 | * init_ctx returns: non NULL upon success |
| 75 | * query returns: 0 - success, otherwise failure |
| 76 | * respond returns: 0 - success, 1 - need further interaction, |
| 77 | * otherwise - failure |
| 78 | */ |
| 79 | struct KbdintDevice |
| 80 | { |
| 81 | const char *name; |
| 82 | void* (*init_ctx) __P((Authctxt*)); |
| 83 | int (*query) __P((void *ctx, char **name, char **infotxt, |
| 84 | u_int *numprompts, char ***prompts, |
| 85 | u_int **echo_on)); |
| 86 | int (*respond) __P((void *ctx, u_int numresp, char **responses)); |
| 87 | void (*free_ctx) __P((void *ctx)); |
| 88 | }; |
| 89 | |
| 90 | /* |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 91 | * Tries to authenticate the user using the .rhosts file. Returns true if |
| 92 | * authentication succeeds. If ignore_rhosts is non-zero, this will not |
| 93 | * consider .rhosts and .shosts (/etc/hosts.equiv will still be used). |
| 94 | */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 95 | int auth_rhosts(struct passwd *, const char *); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 96 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 97 | /* extended interface similar to auth_rhosts() */ |
| 98 | int |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 99 | auth_rhosts2(struct passwd *, const char *, const char *, const char *); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 100 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 101 | /* |
| 102 | * Tries to authenticate the user using the .rhosts file and the host using |
| 103 | * its host key. Returns true if authentication succeeds. |
| 104 | */ |
| 105 | int |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 106 | auth_rhosts_rsa(struct passwd *, const char *, RSA *); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 107 | |
| 108 | /* |
| 109 | * Tries to authenticate the user using password. Returns true if |
| 110 | * authentication succeeds. |
| 111 | */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 112 | int auth_password(Authctxt *, const char *); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 113 | |
| 114 | /* |
| 115 | * Performs the RSA authentication dialog with the client. This returns 0 if |
| 116 | * the client could not be authenticated, and 1 if authentication was |
| 117 | * successful. This may exit if there is a serious protocol violation. |
| 118 | */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 119 | int auth_rsa(struct passwd *, BIGNUM *); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 120 | |
| 121 | /* |
| 122 | * Parses an RSA key (number of bits, e, n) from a string. Moves the pointer |
| 123 | * over the key. Skips any whitespace at the beginning and at end. |
| 124 | */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 125 | int auth_rsa_read_key(char **, u_int *, BIGNUM *, BIGNUM *); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 126 | |
| 127 | /* |
| 128 | * Performs the RSA authentication challenge-response dialog with the client, |
| 129 | * and returns true (non-zero) if the client gave the correct answer to our |
| 130 | * challenge; returns zero if the client gives a wrong answer. |
| 131 | */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 132 | int auth_rsa_challenge_dialog(RSA *); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 133 | |
| 134 | #ifdef KRB4 |
| 135 | #include <krb.h> |
| 136 | /* |
| 137 | * Performs Kerberos v4 mutual authentication with the client. This returns 0 |
| 138 | * if the client could not be authenticated, and 1 if authentication was |
| 139 | * successful. This may exit if there is a serious protocol violation. |
| 140 | */ |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 141 | int auth_krb4(Authctxt *, KTEXT, char **); |
| 142 | int auth_krb4_password(Authctxt *, const char *); |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 143 | void krb4_cleanup_proc(void *); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 144 | |
| 145 | #ifdef AFS |
| 146 | #include <kafs.h> |
| 147 | |
| 148 | /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */ |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 149 | int auth_krb4_tgt(Authctxt *, const char *); |
| 150 | int auth_afs_token(Authctxt *, const char *); |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 151 | #endif /* AFS */ |
| 152 | |
| 153 | #endif /* KRB4 */ |
| 154 | |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 155 | #ifdef KRB5 |
| 156 | int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client); |
| 157 | int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); |
| 158 | int auth_krb5_password(Authctxt *authctxt, const char *password); |
| 159 | void krb5_cleanup_proc(void *authctxt); |
| 160 | #endif /* KRB5 */ |
| 161 | |
Damien Miller | b848158 | 2000-12-03 11:51:51 +1100 | [diff] [blame] | 162 | #include "auth-pam.h" |
| 163 | #include "auth2-pam.h" |
| 164 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 165 | void do_authentication(void); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 166 | void do_authentication2(void); |
| 167 | |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 168 | Authctxt *authctxt_new(void); |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 169 | void auth_log(Authctxt *, int, char *, char *); |
| 170 | void userauth_finish(Authctxt *, int, char *); |
| 171 | int auth_root_allowed(char *); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 172 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 173 | int auth2_challenge(Authctxt *, char *); |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 174 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 175 | int allowed_user(struct passwd *); |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 176 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 177 | char *get_challenge(Authctxt *); |
| 178 | int verify_response(Authctxt *, const char *); |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 179 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 180 | struct passwd * auth_get_user(void); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 181 | |
Ben Lindstrom | bfb3a0e | 2001-06-05 20:25:05 +0000 | [diff] [blame] | 182 | /* expand a filename - return buffer is allocated by xmalloc */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 183 | char *expand_filename(const char *, struct passwd *); |
| 184 | char *authorized_keys_file(struct passwd *); |
| 185 | char *authorized_keys_file2(struct passwd *); |
Ben Lindstrom | bfb3a0e | 2001-06-05 20:25:05 +0000 | [diff] [blame] | 186 | |
| 187 | /* check a file and the path to it */ |
| 188 | int |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 189 | secure_filename(FILE *, const char *, struct passwd *, char *, size_t); |
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 | /* helper for hostbased auth */ |
| 192 | HostStatus |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 193 | check_key_in_hostfiles(struct passwd *, Key *, const char *, |
| 194 | const char *, const char *); |
Ben Lindstrom | 83647ce | 2001-06-25 04:30:16 +0000 | [diff] [blame] | 195 | |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 196 | #define AUTH_FAIL_MAX 6 |
| 197 | #define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2) |
| 198 | #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" |
| 199 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 200 | #endif |