Annotation of src/usr.bin/ssh/auth.h, Revision 1.55
1.55 ! stevesk 1: /* $OpenBSD: auth.h,v 1.54 2006/07/06 16:03:53 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>
1.54 stevesk 37:
1.13 markus 38: #ifdef HAVE_LOGIN_CAP
39: #include <login_cap.h>
40: #endif
41: #ifdef BSD_AUTH
42: #include <bsd_auth.h>
43: #endif
1.21 dugsong 44: #ifdef KRB5
45: #include <krb5.h>
46: #endif
1.54 stevesk 47:
48: #include "key.h"
49: #include "hostfile.h"
1.13 markus 50:
1.6 markus 51: typedef struct Authctxt Authctxt;
1.39 markus 52: typedef struct Authmethod Authmethod;
1.16 markus 53: typedef struct KbdintDevice KbdintDevice;
54:
1.6 markus 55: struct Authctxt {
1.53 djm 56: sig_atomic_t success;
1.42 markus 57: int postponed; /* authentication needs another step */
58: int valid; /* user exists and is allowed to login */
1.21 dugsong 59: int attempt;
60: int failures;
1.49 markus 61: int force_pwchange;
1.42 markus 62: char *user; /* username sent by the client */
1.21 dugsong 63: char *service;
1.42 markus 64: struct passwd *pw; /* set if 'valid' */
1.21 dugsong 65: char *style;
66: void *kbdintctxt;
1.13 markus 67: #ifdef BSD_AUTH
1.21 dugsong 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;
1.13 markus 75: #endif
1.44 markus 76: void *methoddata;
1.6 markus 77: };
1.42 markus 78: /*
79: * Every authentication method has to handle authentication requests for
80: * non-existing users, or for users that are not allowed to login. In this
81: * case 'valid' is set to 0, but 'user' points to the username requested by
82: * the client.
83: */
1.10 markus 84:
1.39 markus 85: struct Authmethod {
86: char *name;
87: int (*userauth)(Authctxt *authctxt);
88: int *enabled;
89: };
90:
1.10 markus 91: /*
1.16 markus 92: * Keyboard interactive device:
1.25 deraadt 93: * init_ctx returns: non NULL upon success
94: * query returns: 0 - success, otherwise failure
1.16 markus 95: * respond returns: 0 - success, 1 - need further interaction,
96: * otherwise - failure
97: */
98: struct KbdintDevice
99: {
100: const char *name;
1.27 millert 101: void* (*init_ctx)(Authctxt*);
1.28 millert 102: int (*query)(void *ctx, char **name, char **infotxt,
103: u_int *numprompts, char ***prompts, u_int **echo_on);
1.27 millert 104: int (*respond)(void *ctx, u_int numresp, char **responses);
105: void (*free_ctx)(void *ctx);
1.16 markus 106: };
107:
1.35 markus 108: int auth_rhosts(struct passwd *, const char *);
1.15 markus 109: int
1.20 itojun 110: auth_rhosts2(struct passwd *, const char *, const char *, const char *);
1.10 markus 111:
1.48 djm 112: int auth_rhosts_rsa(Authctxt *, char *, Key *);
1.22 markus 113: int auth_password(Authctxt *, const char *);
1.48 djm 114: int auth_rsa(Authctxt *, BIGNUM *);
1.30 markus 115: int auth_rsa_challenge_dialog(Key *);
1.35 markus 116: BIGNUM *auth_rsa_generate_challenge(Key *);
117: int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
118: int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
119:
120: int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
121: int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
122: int user_key_allowed(struct passwd *, Key *);
1.21 dugsong 123:
124: #ifdef KRB5
1.40 itojun 125: int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
1.21 dugsong 126: int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
127: int auth_krb5_password(Authctxt *authctxt, const char *password);
1.47 markus 128: void krb5_cleanup_proc(Authctxt *authctxt);
1.21 dugsong 129: #endif /* KRB5 */
1.6 markus 130:
1.47 markus 131: void do_authentication(Authctxt *);
132: void do_authentication2(Authctxt *);
1.2 markus 133:
1.20 itojun 134: void auth_log(Authctxt *, int, char *, char *);
135: void userauth_finish(Authctxt *, int, char *);
136: int auth_root_allowed(char *);
1.36 djm 137:
138: char *auth2_read_banner(void);
1.6 markus 139:
1.34 provos 140: void privsep_challenge_enable(void);
141:
1.20 itojun 142: int auth2_challenge(Authctxt *, char *);
1.23 markus 143: void auth2_challenge_stop(Authctxt *);
1.35 markus 144: int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
145: int bsdauth_respond(void *, u_int, char **);
146: int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
147: int skey_respond(void *, u_int, char **);
1.1 markus 148:
1.20 itojun 149: int allowed_user(struct passwd *);
1.32 provos 150: struct passwd * getpwnamallow(const char *user);
1.9 markus 151:
1.20 itojun 152: char *get_challenge(Authctxt *);
153: int verify_response(Authctxt *, const char *);
1.17 markus 154:
1.20 itojun 155: char *authorized_keys_file(struct passwd *);
156: char *authorized_keys_file2(struct passwd *);
1.17 markus 157:
158: int
1.20 itojun 159: secure_filename(FILE *, const char *, struct passwd *, char *, size_t);
1.18 markus 160:
161: HostStatus
1.20 itojun 162: check_key_in_hostfiles(struct passwd *, Key *, const char *,
163: const char *, const char *);
1.35 markus 164:
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 *);
1.37 markus 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);
1.45 markus 175:
176: struct passwd *fakepw(void);
1.3 markus 177:
178: #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
179:
1.34 provos 180: #define SKEY_PROMPT "\nS/Key Password: "
1.1 markus 181: #endif
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