Annotation of src/usr.bin/ssh/auth.h, Revision 1.56
1.56 ! stevesk 1: /* $OpenBSD: auth.h,v 1.55 2006/07/23 01:11:05 stevesk Exp $ */
1.29 stevesk 2:
1.5 deraadt 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.
1.7 djm 25: *
1.5 deraadt 26: */
1.29 stevesk 27:
1.1 markus 28: #ifndef AUTH_H
29: #define AUTH_H
30:
1.54 stevesk 31: #include <sys/types.h>
32:
1.10 markus 33: #include <openssl/rsa.h>
34:
1.54 stevesk 35: #include <pwd.h>
1.55 stevesk 36: #include <signal.h>
1.56 ! stevesk 37: #include <stdio.h>
1.54 stevesk 38:
1.13 markus 39: #ifdef HAVE_LOGIN_CAP
40: #include <login_cap.h>
41: #endif
42: #ifdef BSD_AUTH
43: #include <bsd_auth.h>
44: #endif
1.21 dugsong 45: #ifdef KRB5
46: #include <krb5.h>
47: #endif
1.54 stevesk 48:
49: #include "key.h"
50: #include "hostfile.h"
1.13 markus 51:
1.6 markus 52: typedef struct Authctxt Authctxt;
1.39 markus 53: typedef struct Authmethod Authmethod;
1.16 markus 54: typedef struct KbdintDevice KbdintDevice;
55:
1.6 markus 56: struct Authctxt {
1.53 djm 57: sig_atomic_t success;
1.42 markus 58: int postponed; /* authentication needs another step */
59: int valid; /* user exists and is allowed to login */
1.21 dugsong 60: int attempt;
61: int failures;
1.49 markus 62: int force_pwchange;
1.42 markus 63: char *user; /* username sent by the client */
1.21 dugsong 64: char *service;
1.42 markus 65: struct passwd *pw; /* set if 'valid' */
1.21 dugsong 66: char *style;
67: void *kbdintctxt;
1.13 markus 68: #ifdef BSD_AUTH
1.21 dugsong 69: auth_session_t *as;
70: #endif
71: #ifdef KRB5
72: krb5_context krb5_ctx;
73: krb5_ccache krb5_fwd_ccache;
74: krb5_principal krb5_user;
75: char *krb5_ticket_file;
1.13 markus 76: #endif
1.44 markus 77: void *methoddata;
1.6 markus 78: };
1.42 markus 79: /*
80: * Every authentication method has to handle authentication requests for
81: * non-existing users, or for users that are not allowed to login. In this
82: * case 'valid' is set to 0, but 'user' points to the username requested by
83: * the client.
84: */
1.10 markus 85:
1.39 markus 86: struct Authmethod {
87: char *name;
88: int (*userauth)(Authctxt *authctxt);
89: int *enabled;
90: };
91:
1.10 markus 92: /*
1.16 markus 93: * Keyboard interactive device:
1.25 deraadt 94: * init_ctx returns: non NULL upon success
95: * query returns: 0 - success, otherwise failure
1.16 markus 96: * respond returns: 0 - success, 1 - need further interaction,
97: * otherwise - failure
98: */
99: struct KbdintDevice
100: {
101: const char *name;
1.27 millert 102: void* (*init_ctx)(Authctxt*);
1.28 millert 103: int (*query)(void *ctx, char **name, char **infotxt,
104: u_int *numprompts, char ***prompts, u_int **echo_on);
1.27 millert 105: int (*respond)(void *ctx, u_int numresp, char **responses);
106: void (*free_ctx)(void *ctx);
1.16 markus 107: };
108:
1.35 markus 109: int auth_rhosts(struct passwd *, const char *);
1.15 markus 110: int
1.20 itojun 111: auth_rhosts2(struct passwd *, const char *, const char *, const char *);
1.10 markus 112:
1.48 djm 113: int auth_rhosts_rsa(Authctxt *, char *, Key *);
1.22 markus 114: int auth_password(Authctxt *, const char *);
1.48 djm 115: int auth_rsa(Authctxt *, BIGNUM *);
1.30 markus 116: int auth_rsa_challenge_dialog(Key *);
1.35 markus 117: BIGNUM *auth_rsa_generate_challenge(Key *);
118: int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
119: int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
120:
121: int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
122: int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
123: int user_key_allowed(struct passwd *, Key *);
1.21 dugsong 124:
125: #ifdef KRB5
1.40 itojun 126: int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
1.21 dugsong 127: int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
128: int auth_krb5_password(Authctxt *authctxt, const char *password);
1.47 markus 129: void krb5_cleanup_proc(Authctxt *authctxt);
1.21 dugsong 130: #endif /* KRB5 */
1.6 markus 131:
1.47 markus 132: void do_authentication(Authctxt *);
133: void do_authentication2(Authctxt *);
1.2 markus 134:
1.20 itojun 135: void auth_log(Authctxt *, int, char *, char *);
136: void userauth_finish(Authctxt *, int, char *);
137: int auth_root_allowed(char *);
1.36 djm 138:
139: char *auth2_read_banner(void);
1.6 markus 140:
1.34 provos 141: void privsep_challenge_enable(void);
142:
1.20 itojun 143: int auth2_challenge(Authctxt *, char *);
1.23 markus 144: void auth2_challenge_stop(Authctxt *);
1.35 markus 145: int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
146: int bsdauth_respond(void *, u_int, char **);
147: int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
148: int skey_respond(void *, u_int, char **);
1.1 markus 149:
1.20 itojun 150: int allowed_user(struct passwd *);
1.32 provos 151: struct passwd * getpwnamallow(const char *user);
1.9 markus 152:
1.20 itojun 153: char *get_challenge(Authctxt *);
154: int verify_response(Authctxt *, const char *);
1.17 markus 155:
1.20 itojun 156: char *authorized_keys_file(struct passwd *);
157: char *authorized_keys_file2(struct passwd *);
1.17 markus 158:
159: int
1.20 itojun 160: secure_filename(FILE *, const char *, struct passwd *, char *, size_t);
1.18 markus 161:
162: HostStatus
1.20 itojun 163: check_key_in_hostfiles(struct passwd *, Key *, const char *,
164: const char *, const char *);
1.35 markus 165:
166: /* hostkey handling */
167: Key *get_hostkey_by_index(int);
168: Key *get_hostkey_by_type(int);
169: int get_hostkey_index(Key *);
170: int ssh1_session_key(BIGNUM *);
1.37 markus 171:
172: /* debug messages during authentication */
173: void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
174: void auth_debug_send(void);
175: void auth_debug_reset(void);
1.45 markus 176:
177: struct passwd *fakepw(void);
1.3 markus 178:
179: #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
180:
1.34 provos 181: #define SKEY_PROMPT "\nS/Key Password: "
1.1 markus 182: #endif
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