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cdd66111 | 1 | /* $OpenBSD: auth.h,v 1.49 2004/01/30 09:48:57 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; | |
cdd66111 | 55 | int force_pwchange; |
0fff78ff | 56 | char *user; /* username sent by the client */ |
3c0ef626 | 57 | char *service; |
0fff78ff | 58 | struct passwd *pw; /* set if 'valid' */ |
3c0ef626 | 59 | char *style; |
60 | void *kbdintctxt; | |
61 | #ifdef BSD_AUTH | |
62 | auth_session_t *as; | |
63 | #endif | |
3c0ef626 | 64 | #ifdef KRB5 |
65 | krb5_context krb5_ctx; | |
3c0ef626 | 66 | krb5_ccache krb5_fwd_ccache; |
67 | krb5_principal krb5_user; | |
68 | char *krb5_ticket_file; | |
69 | #endif | |
0fff78ff | 70 | void *methoddata; |
3c0ef626 | 71 | }; |
0fff78ff | 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 | */ | |
3c0ef626 | 78 | |
f5799ae1 | 79 | struct Authmethod { |
80 | char *name; | |
81 | int (*userauth)(Authctxt *authctxt); | |
82 | int *enabled; | |
83 | }; | |
84 | ||
3c0ef626 | 85 | /* |
86 | * Keyboard interactive device: | |
e9a17296 | 87 | * init_ctx returns: non NULL upon success |
88 | * query returns: 0 - success, otherwise failure | |
3c0ef626 | 89 | * respond returns: 0 - success, 1 - need further interaction, |
90 | * otherwise - failure | |
91 | */ | |
92 | struct KbdintDevice | |
93 | { | |
94 | const char *name; | |
e9a17296 | 95 | void* (*init_ctx)(Authctxt*); |
96 | int (*query)(void *ctx, char **name, char **infotxt, | |
97 | u_int *numprompts, char ***prompts, u_int **echo_on); | |
98 | int (*respond)(void *ctx, u_int numresp, char **responses); | |
99 | void (*free_ctx)(void *ctx); | |
3c0ef626 | 100 | }; |
101 | ||
700318f3 | 102 | int auth_rhosts(struct passwd *, const char *); |
3c0ef626 | 103 | int |
104 | auth_rhosts2(struct passwd *, const char *, const char *, const char *); | |
105 | ||
cdd66111 | 106 | int auth_rhosts_rsa(Authctxt *, char *, Key *); |
3c0ef626 | 107 | int auth_password(Authctxt *, const char *); |
cdd66111 | 108 | int auth_rsa(Authctxt *, BIGNUM *); |
700318f3 | 109 | int auth_rsa_challenge_dialog(Key *); |
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 *); | |
3c0ef626 | 117 | |
3c0ef626 | 118 | #ifdef KRB5 |
41b2f314 | 119 | int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); |
3c0ef626 | 120 | int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); |
121 | int auth_krb5_password(Authctxt *authctxt, const char *password); | |
cdd66111 | 122 | void krb5_cleanup_proc(Authctxt *authctxt); |
3c0ef626 | 123 | #endif /* KRB5 */ |
124 | ||
cdd66111 | 125 | #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) |
126 | #include <shadow.h> | |
127 | int auth_shadow_acctexpired(struct spwd *); | |
128 | int auth_shadow_pwexpired(Authctxt *); | |
129 | #endif | |
130 | ||
3c0ef626 | 131 | #include "auth-pam.h" |
cdd66111 | 132 | void disable_forwarding(void); |
3c0ef626 | 133 | |
cdd66111 | 134 | void do_authentication(Authctxt *); |
135 | void do_authentication2(Authctxt *); | |
3c0ef626 | 136 | |
3c0ef626 | 137 | void auth_log(Authctxt *, int, char *, char *); |
138 | void userauth_finish(Authctxt *, int, char *); | |
139 | int auth_root_allowed(char *); | |
140 | ||
700318f3 | 141 | char *auth2_read_banner(void); |
142 | ||
143 | void privsep_challenge_enable(void); | |
144 | ||
3c0ef626 | 145 | int auth2_challenge(Authctxt *, char *); |
e9a17296 | 146 | void auth2_challenge_stop(Authctxt *); |
700318f3 | 147 | int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); |
148 | int bsdauth_respond(void *, u_int, char **); | |
149 | int skey_query(void *, char **, char **, u_int *, char ***, u_int **); | |
150 | int skey_respond(void *, u_int, char **); | |
3c0ef626 | 151 | |
152 | int allowed_user(struct passwd *); | |
700318f3 | 153 | struct passwd * getpwnamallow(const char *user); |
3c0ef626 | 154 | |
155 | char *get_challenge(Authctxt *); | |
156 | int verify_response(Authctxt *, const char *); | |
0fff78ff | 157 | void abandon_challenge_response(Authctxt *); |
3c0ef626 | 158 | |
3c0ef626 | 159 | char *expand_filename(const char *, struct passwd *); |
160 | char *authorized_keys_file(struct passwd *); | |
161 | char *authorized_keys_file2(struct passwd *); | |
162 | ||
163 | int | |
164 | secure_filename(FILE *, const char *, struct passwd *, char *, size_t); | |
165 | ||
166 | HostStatus | |
167 | check_key_in_hostfiles(struct passwd *, Key *, const char *, | |
168 | const char *, const char *); | |
169 | ||
700318f3 | 170 | /* hostkey handling */ |
171 | Key *get_hostkey_by_index(int); | |
172 | Key *get_hostkey_by_type(int); | |
173 | int get_hostkey_index(Key *); | |
174 | int ssh1_session_key(BIGNUM *); | |
175 | ||
176 | /* debug messages during authentication */ | |
177 | void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
178 | void auth_debug_send(void); | |
179 | void auth_debug_reset(void); | |
180 | ||
0fff78ff | 181 | struct passwd *fakepw(void); |
182 | ||
3c0ef626 | 183 | #define AUTH_FAIL_MAX 6 |
184 | #define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2) | |
185 | #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" | |
186 | ||
700318f3 | 187 | #define SKEY_PROMPT "\nS/Key Password: " |
3c0ef626 | 188 | #endif |