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1 | /* $OpenBSD: auth.h,v 1.62 2008/11/04 08:22:12 djm Exp $ */ | |
2 | ||
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 | * | |
26 | */ | |
27 | ||
28 | #ifndef AUTH_H | |
29 | #define AUTH_H | |
30 | ||
31 | #include <signal.h> | |
32 | ||
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 | #ifdef AFS_KRB5 | |
45 | #include <krbafs.h> | |
46 | #endif | |
47 | ||
48 | typedef struct Authctxt Authctxt; | |
49 | typedef struct Authmethod Authmethod; | |
50 | typedef struct KbdintDevice KbdintDevice; | |
51 | ||
52 | struct Authctxt { | |
53 | sig_atomic_t success; | |
54 | int authenticated; /* authenticated and alarms cancelled */ | |
55 | int postponed; /* authentication needs another step */ | |
56 | int valid; /* user exists and is allowed to login */ | |
57 | int attempt; | |
58 | int failures; | |
59 | int server_caused_failure; | |
60 | int force_pwchange; | |
61 | char *user; /* username sent by the client */ | |
62 | char *service; | |
63 | struct passwd *pw; /* set if 'valid' */ | |
64 | char *style; | |
65 | void *kbdintctxt; | |
66 | void *jpake_ctx; | |
67 | #ifdef BSD_AUTH | |
68 | auth_session_t *as; | |
69 | #endif | |
70 | #ifdef KRB5 | |
71 | krb5_context krb5_ctx; | |
72 | krb5_ccache krb5_fwd_ccache; | |
73 | krb5_principal krb5_user; | |
74 | char *krb5_ticket_file; | |
75 | char *krb5_ccname; | |
76 | #endif | |
77 | #ifdef SESSION_HOOKS | |
78 | char *session_env_file; | |
79 | #endif | |
80 | Buffer *loginmsg; | |
81 | void *methoddata; | |
82 | }; | |
83 | /* | |
84 | * Every authentication method has to handle authentication requests for | |
85 | * non-existing users, or for users that are not allowed to login. In this | |
86 | * case 'valid' is set to 0, but 'user' points to the username requested by | |
87 | * the client. | |
88 | */ | |
89 | ||
90 | struct Authmethod { | |
91 | char *name; | |
92 | int (*userauth)(Authctxt *authctxt); | |
93 | int *enabled; | |
94 | }; | |
95 | ||
96 | /* | |
97 | * Keyboard interactive device: | |
98 | * init_ctx returns: non NULL upon success | |
99 | * query returns: 0 - success, otherwise failure | |
100 | * respond returns: 0 - success, 1 - need further interaction, | |
101 | * otherwise - failure | |
102 | */ | |
103 | struct KbdintDevice | |
104 | { | |
105 | const char *name; | |
106 | void* (*init_ctx)(Authctxt*); | |
107 | int (*query)(void *ctx, char **name, char **infotxt, | |
108 | u_int *numprompts, char ***prompts, u_int **echo_on); | |
109 | int (*respond)(void *ctx, u_int numresp, char **responses); | |
110 | void (*free_ctx)(void *ctx); | |
111 | }; | |
112 | ||
113 | int auth_rhosts(struct passwd *, const char *); | |
114 | int | |
115 | auth_rhosts2(struct passwd *, const char *, const char *, const char *); | |
116 | ||
117 | int auth_rhosts_rsa(Authctxt *, char *, Key *); | |
118 | int auth_password(Authctxt *, const char *); | |
119 | int auth_rsa(Authctxt *, BIGNUM *); | |
120 | int auth_rsa_challenge_dialog(Key *); | |
121 | BIGNUM *auth_rsa_generate_challenge(Key *); | |
122 | int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); | |
123 | int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); | |
124 | ||
125 | int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); | |
126 | int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); | |
127 | int user_key_allowed(struct passwd *, Key *); | |
128 | ||
129 | #ifdef KRB5 | |
130 | int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); | |
131 | int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); | |
132 | int auth_krb5_password(Authctxt *authctxt, const char *password); | |
133 | void krb5_cleanup_proc(Authctxt *authctxt); | |
134 | #endif /* KRB5 */ | |
135 | ||
136 | #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) | |
137 | #include <shadow.h> | |
138 | int auth_shadow_acctexpired(struct spwd *); | |
139 | int auth_shadow_pwexpired(Authctxt *); | |
140 | #endif | |
141 | ||
142 | #include "auth-pam.h" | |
143 | #include "audit.h" | |
144 | void remove_kbdint_device(const char *); | |
145 | ||
146 | void disable_forwarding(void); | |
147 | ||
148 | void do_authentication(Authctxt *); | |
149 | void do_authentication2(Authctxt *); | |
150 | ||
151 | void auth_log(Authctxt *, int, char *, char *); | |
152 | void userauth_finish(Authctxt *, int, char *); | |
153 | void userauth_send_banner(const char *); | |
154 | int auth_root_allowed(char *); | |
155 | char *expand_authorized_keys(const char *filename, struct passwd *pw); | |
156 | ||
157 | char *auth2_read_banner(void); | |
158 | ||
159 | void privsep_challenge_enable(void); | |
160 | ||
161 | int auth2_challenge(Authctxt *, char *); | |
162 | void auth2_challenge_stop(Authctxt *); | |
163 | int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); | |
164 | int bsdauth_respond(void *, u_int, char **); | |
165 | int skey_query(void *, char **, char **, u_int *, char ***, u_int **); | |
166 | int skey_respond(void *, u_int, char **); | |
167 | ||
168 | void auth2_jpake_get_pwdata(Authctxt *, BIGNUM **, char **, char **); | |
169 | void auth2_jpake_stop(Authctxt *); | |
170 | ||
171 | int allowed_user(struct passwd *); | |
172 | struct passwd * getpwnamallow(const char *user); | |
173 | ||
174 | char *get_challenge(Authctxt *); | |
175 | int verify_response(Authctxt *, const char *); | |
176 | void abandon_challenge_response(Authctxt *); | |
177 | ||
178 | char *authorized_keys_file(struct passwd *); | |
179 | char *authorized_keys_file2(struct passwd *); | |
180 | ||
181 | FILE *auth_openkeyfile(const char *, struct passwd *, int); | |
182 | ||
183 | HostStatus | |
184 | check_key_in_hostfiles(struct passwd *, Key *, const char *, | |
185 | const char *, const char *); | |
186 | ||
187 | /* hostkey handling */ | |
188 | Key *get_hostkey_by_index(int); | |
189 | Key *get_hostkey_by_type(int); | |
190 | int get_hostkey_index(Key *); | |
191 | int ssh1_session_key(BIGNUM *); | |
192 | ||
193 | /* debug messages during authentication */ | |
194 | void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
195 | void auth_debug_send(void); | |
196 | void auth_debug_reset(void); | |
197 | ||
198 | struct passwd *fakepw(void); | |
199 | ||
200 | int sys_auth_passwd(Authctxt *, const char *); | |
201 | ||
202 | #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" | |
203 | ||
204 | #define SKEY_PROMPT "\nS/Key Password: " | |
205 | ||
206 | #if defined(KRB5) && !defined(HEIMDAL) | |
207 | #include <krb5.h> | |
208 | krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); | |
209 | #endif | |
210 | #endif |