Globus Toolkit  6.0.1493297102
auth.h
1 /* $OpenBSD: auth.h,v 1.88 2016/05/04 14:04:40 markus 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 struct ssh;
49 struct sshkey;
50 
51 typedef struct Authctxt Authctxt;
52 typedef struct Authmethod Authmethod;
53 typedef struct KbdintDevice KbdintDevice;
54 
55 struct Authctxt {
56  sig_atomic_t success;
57  int authenticated; /* authenticated and alarms cancelled */
58  int postponed; /* authentication needs another step */
59  int valid; /* user exists and is allowed to login */
60  int attempt;
61  int failures;
62  int server_caused_failure;
63  int force_pwchange;
64  char *user; /* username sent by the client */
65  char *service;
66  struct passwd *pw; /* set if 'valid' */
67  char *style;
68  void *kbdintctxt;
69  char *info; /* Extra info for next auth_log */
70 #ifdef BSD_AUTH
71  auth_session_t *as;
72 #endif
73  char **auth_methods; /* modified from server config */
74  u_int num_auth_methods;
75 #ifdef KRB5
76  krb5_context krb5_ctx;
77  krb5_ccache krb5_fwd_ccache;
78  krb5_principal krb5_user;
79  char *krb5_ticket_file;
80  char *krb5_ccname;
81 #endif
82 #ifdef SESSION_HOOKS
83  char *session_env_file;
84 #endif
85  Buffer *loginmsg;
86  void *methoddata;
87 
88  struct sshkey **prev_userkeys;
89  u_int nprev_userkeys;
90 };
91 /*
92  * Every authentication method has to handle authentication requests for
93  * non-existing users, or for users that are not allowed to login. In this
94  * case 'valid' is set to 0, but 'user' points to the username requested by
95  * the client.
96  */
97 
98 struct Authmethod {
99  char *name;
100  int (*userauth)(Authctxt *authctxt);
101  int *enabled;
102 };
103 
104 /*
105  * Keyboard interactive device:
106  * init_ctx returns: non NULL upon success
107  * query returns: 0 - success, otherwise failure
108  * respond returns: 0 - success, 1 - need further interaction,
109  * otherwise - failure
110  */
111 struct KbdintDevice
112 {
113  const char *name;
114  void* (*init_ctx)(Authctxt*);
115  int (*query)(void *ctx, char **name, char **infotxt,
116  u_int *numprompts, char ***prompts, u_int **echo_on);
117  int (*respond)(void *ctx, u_int numresp, char **responses);
118  void (*free_ctx)(void *ctx);
119 };
120 
121 int auth_rhosts(struct passwd *, const char *);
122 int
123 auth_rhosts2(struct passwd *, const char *, const char *, const char *);
124 
125 int auth_rhosts_rsa(Authctxt *, char *, Key *);
126 int auth_password(Authctxt *, const char *);
127 int auth_rsa(Authctxt *, BIGNUM *);
128 int auth_rsa_challenge_dialog(Key *);
129 BIGNUM *auth_rsa_generate_challenge(Key *);
130 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
131 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
132 
133 int auth_rhosts_rsa_key_allowed(struct passwd *, const char *,
134  const char *, Key *);
135 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
136 int user_key_allowed(struct passwd *, Key *, int);
137 void pubkey_auth_info(Authctxt *, const Key *, const char *, ...)
138  __attribute__((__format__ (printf, 3, 4)));
139 void auth2_record_userkey(Authctxt *, struct sshkey *);
140 int auth2_userkey_already_used(Authctxt *, struct sshkey *);
141 
142 struct stat;
143 int auth_secure_path(const char *, struct stat *, const char *, uid_t,
144  char *, size_t);
145 
146 #ifdef KRB5
147 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
148 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
149 int auth_krb5_password(Authctxt *authctxt, const char *password);
150 void krb5_cleanup_proc(Authctxt *authctxt);
151 #endif /* KRB5 */
152 
153 #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
154 #include <shadow.h>
155 int auth_shadow_acctexpired(struct spwd *);
156 int auth_shadow_pwexpired(Authctxt *);
157 #endif
158 
159 #include "auth-pam.h"
160 #include "audit.h"
161 void remove_kbdint_device(const char *);
162 
163 void disable_forwarding(void);
164 
165 void do_authentication(Authctxt *);
166 void do_authentication2(Authctxt *);
167 
168 void auth_info(Authctxt *authctxt, const char *, ...)
169  __attribute__((__format__ (printf, 2, 3)))
170  __attribute__((__nonnull__ (2)));
171 void auth_log(Authctxt *, int, int, const char *, const char *);
172 void auth_maxtries_exceeded(Authctxt *) __attribute__((noreturn));
173 void userauth_finish(Authctxt *, int, const char *, const char *);
174 int auth_root_allowed(const char *);
175 
176 void userauth_send_banner(const char *);
177 
178 char *auth2_read_banner(void);
179 int auth2_methods_valid(const char *, int);
180 int auth2_update_methods_lists(Authctxt *, const char *, const char *);
181 int auth2_setup_methods_lists(Authctxt *);
182 int auth2_method_allowed(Authctxt *, const char *, const char *);
183 
184 void privsep_challenge_enable(void);
185 
186 int auth2_challenge(Authctxt *, char *);
187 void auth2_challenge_stop(Authctxt *);
188 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
189 int bsdauth_respond(void *, u_int, char **);
190 int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
191 int skey_respond(void *, u_int, char **);
192 
193 int allowed_user(struct passwd *);
194 struct passwd * getpwnamallow(const char *user);
195 
196 char *get_challenge(Authctxt *);
197 int verify_response(Authctxt *, const char *);
198 void abandon_challenge_response(Authctxt *);
199 
200 char *expand_authorized_keys(const char *, struct passwd *pw);
201 char *authorized_principals_file(struct passwd *);
202 
203 FILE *auth_openkeyfile(const char *, struct passwd *, int);
204 FILE *auth_openprincipals(const char *, struct passwd *, int);
205 int auth_key_is_revoked(Key *);
206 
207 const char *auth_get_canonical_hostname(struct ssh *, int);
208 
209 HostStatus
210 check_key_in_hostfiles(struct passwd *, Key *, const char *,
211  const char *, const char *);
212 
213 /* hostkey handling */
214 Key *get_hostkey_by_index(int);
215 Key *get_hostkey_public_by_index(int, struct ssh *);
216 Key *get_hostkey_public_by_type(int, int, struct ssh *);
217 Key *get_hostkey_private_by_type(int, int, struct ssh *);
218 int get_hostkey_index(Key *, int, struct ssh *);
219 int ssh1_session_key(BIGNUM *);
220 int sshd_hostkey_sign(Key *, Key *, u_char **, size_t *,
221  const u_char *, size_t, const char *, u_int);
222 
223 /* debug messages during authentication */
224 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
225 void auth_debug_send(void);
226 void auth_debug_reset(void);
227 
228 struct passwd *fakepw(void);
229 
230 int sys_auth_passwd(Authctxt *, const char *);
231 
232 #define SKEY_PROMPT "\nS/Key Password: "
233 
234 #if defined(KRB5) && !defined(HEIMDAL)
235 #include <krb5.h>
236 krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *);
237 #endif
238 #endif