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9cb1827b | 1 | /* $OpenBSD: auth.h,v 1.46 2003/08/28 12:54:34 markus Exp $ */ |
e9a17296 | 2 | |
3c0ef626 | 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. | |
25 | * | |
3c0ef626 | 26 | */ |
e9a17296 | 27 | |
3c0ef626 | 28 | #ifndef AUTH_H |
29 | #define AUTH_H | |
30 | ||
31 | #include "key.h" | |
32 | #include "hostfile.h" | |
33 | #include <openssl/rsa.h> | |
34 | ||
35 | #ifdef HAVE_LOGIN_CAP | |
36 | #include <login_cap.h> | |
37 | #endif | |
38 | #ifdef BSD_AUTH | |
39 | #include <bsd_auth.h> | |
40 | #endif | |
41 | #ifdef KRB5 | |
42 | #include <krb5.h> | |
43 | #endif | |
44 | ||
45 | typedef struct Authctxt Authctxt; | |
f5799ae1 | 46 | typedef struct Authmethod Authmethod; |
3c0ef626 | 47 | typedef struct KbdintDevice KbdintDevice; |
48 | ||
49 | struct Authctxt { | |
50 | int success; | |
0fff78ff | 51 | int postponed; /* authentication needs another step */ |
52 | int valid; /* user exists and is allowed to login */ | |
3c0ef626 | 53 | int attempt; |
54 | int failures; | |
0fff78ff | 55 | char *user; /* username sent by the client */ |
3c0ef626 | 56 | char *service; |
0fff78ff | 57 | struct passwd *pw; /* set if 'valid' */ |
3c0ef626 | 58 | char *style; |
59 | void *kbdintctxt; | |
60 | #ifdef BSD_AUTH | |
61 | auth_session_t *as; | |
62 | #endif | |
3c0ef626 | 63 | #ifdef KRB5 |
64 | krb5_context krb5_ctx; | |
3c0ef626 | 65 | krb5_ccache krb5_fwd_ccache; |
66 | krb5_principal krb5_user; | |
67 | char *krb5_ticket_file; | |
68 | #endif | |
0fff78ff | 69 | void *methoddata; |
3c0ef626 | 70 | }; |
0fff78ff | 71 | /* |
72 | * Every authentication method has to handle authentication requests for | |
73 | * non-existing users, or for users that are not allowed to login. In this | |
74 | * case 'valid' is set to 0, but 'user' points to the username requested by | |
75 | * the client. | |
76 | */ | |
3c0ef626 | 77 | |
f5799ae1 | 78 | struct Authmethod { |
79 | char *name; | |
80 | int (*userauth)(Authctxt *authctxt); | |
81 | int *enabled; | |
82 | }; | |
83 | ||
3c0ef626 | 84 | /* |
85 | * Keyboard interactive device: | |
e9a17296 | 86 | * init_ctx returns: non NULL upon success |
87 | * query returns: 0 - success, otherwise failure | |
3c0ef626 | 88 | * respond returns: 0 - success, 1 - need further interaction, |
89 | * otherwise - failure | |
90 | */ | |
91 | struct KbdintDevice | |
92 | { | |
93 | const char *name; | |
e9a17296 | 94 | void* (*init_ctx)(Authctxt*); |
95 | int (*query)(void *ctx, char **name, char **infotxt, | |
96 | u_int *numprompts, char ***prompts, u_int **echo_on); | |
97 | int (*respond)(void *ctx, u_int numresp, char **responses); | |
98 | void (*free_ctx)(void *ctx); | |
3c0ef626 | 99 | }; |
100 | ||
700318f3 | 101 | int auth_rhosts(struct passwd *, const char *); |
3c0ef626 | 102 | int |
103 | auth_rhosts2(struct passwd *, const char *, const char *, const char *); | |
104 | ||
9cb1827b | 105 | int auth_rhosts_rsa(struct passwd *, char *, Key *); |
3c0ef626 | 106 | int auth_password(Authctxt *, const char *); |
9cb1827b | 107 | int auth_rsa(struct passwd *, BIGNUM *); |
700318f3 | 108 | int auth_rsa_challenge_dialog(Key *); |
109 | BIGNUM *auth_rsa_generate_challenge(Key *); | |
110 | int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); | |
111 | int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); | |
112 | ||
113 | int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); | |
114 | int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); | |
115 | int user_key_allowed(struct passwd *, Key *); | |
3c0ef626 | 116 | |
3c0ef626 | 117 | #ifdef KRB5 |
41b2f314 | 118 | int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); |
3c0ef626 | 119 | int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); |
120 | int auth_krb5_password(Authctxt *authctxt, const char *password); | |
9cb1827b | 121 | void krb5_cleanup_proc(void *authctxt); |
3c0ef626 | 122 | #endif /* KRB5 */ |
123 | ||
124 | #include "auth-pam.h" | |
3c0ef626 | 125 | |
9cb1827b | 126 | Authctxt *do_authentication(void); |
127 | Authctxt *do_authentication2(void); | |
3c0ef626 | 128 | |
9cb1827b | 129 | Authctxt *authctxt_new(void); |
3c0ef626 | 130 | void auth_log(Authctxt *, int, char *, char *); |
131 | void userauth_finish(Authctxt *, int, char *); | |
132 | int auth_root_allowed(char *); | |
133 | ||
700318f3 | 134 | char *auth2_read_banner(void); |
135 | ||
136 | void privsep_challenge_enable(void); | |
137 | ||
3c0ef626 | 138 | int auth2_challenge(Authctxt *, char *); |
e9a17296 | 139 | void auth2_challenge_stop(Authctxt *); |
700318f3 | 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 **); | |
3c0ef626 | 144 | |
145 | int allowed_user(struct passwd *); | |
700318f3 | 146 | struct passwd * getpwnamallow(const char *user); |
3c0ef626 | 147 | |
148 | char *get_challenge(Authctxt *); | |
149 | int verify_response(Authctxt *, const char *); | |
0fff78ff | 150 | void abandon_challenge_response(Authctxt *); |
3c0ef626 | 151 | |
9cb1827b | 152 | struct passwd * auth_get_user(void); |
153 | ||
3c0ef626 | 154 | char *expand_filename(const char *, struct passwd *); |
155 | char *authorized_keys_file(struct passwd *); | |
156 | char *authorized_keys_file2(struct passwd *); | |
157 | ||
158 | int | |
159 | secure_filename(FILE *, const char *, struct passwd *, char *, size_t); | |
160 | ||
161 | HostStatus | |
162 | check_key_in_hostfiles(struct passwd *, Key *, const char *, | |
163 | const char *, const char *); | |
164 | ||
700318f3 | 165 | /* hostkey handling */ |
166 | Key *get_hostkey_by_index(int); | |
167 | Key *get_hostkey_by_type(int); | |
168 | int get_hostkey_index(Key *); | |
169 | int ssh1_session_key(BIGNUM *); | |
170 | ||
171 | /* debug messages during authentication */ | |
172 | void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
173 | void auth_debug_send(void); | |
174 | void auth_debug_reset(void); | |
175 | ||
0fff78ff | 176 | struct passwd *fakepw(void); |
177 | ||
3c0ef626 | 178 | #define AUTH_FAIL_MAX 6 |
179 | #define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2) | |
180 | #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" | |
181 | ||
700318f3 | 182 | #define SKEY_PROMPT "\nS/Key Password: " |
3c0ef626 | 183 | #endif |