Annotation of src/usr.bin/ssh/auth.h, Revision 1.57
1.57 ! deraadt 1: /* $OpenBSD: auth.h,v 1.56 2006/08/01 23:22:47 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:
1.57 ! deraadt 31: #include <signal.h>
1.54 stevesk 32:
1.10 markus 33: #include <openssl/rsa.h>
34:
1.13 markus 35: #ifdef HAVE_LOGIN_CAP
36: #include <login_cap.h>
37: #endif
38: #ifdef BSD_AUTH
39: #include <bsd_auth.h>
40: #endif
1.21 dugsong 41: #ifdef KRB5
42: #include <krb5.h>
43: #endif
1.13 markus 44:
1.6 markus 45: typedef struct Authctxt Authctxt;
1.39 markus 46: typedef struct Authmethod Authmethod;
1.16 markus 47: typedef struct KbdintDevice KbdintDevice;
48:
1.6 markus 49: struct Authctxt {
1.53 djm 50: sig_atomic_t success;
1.42 markus 51: int postponed; /* authentication needs another step */
52: int valid; /* user exists and is allowed to login */
1.21 dugsong 53: int attempt;
54: int failures;
1.49 markus 55: int force_pwchange;
1.42 markus 56: char *user; /* username sent by the client */
1.21 dugsong 57: char *service;
1.42 markus 58: struct passwd *pw; /* set if 'valid' */
1.21 dugsong 59: char *style;
60: void *kbdintctxt;
1.13 markus 61: #ifdef BSD_AUTH
1.21 dugsong 62: auth_session_t *as;
63: #endif
64: #ifdef KRB5
65: krb5_context krb5_ctx;
66: krb5_ccache krb5_fwd_ccache;
67: krb5_principal krb5_user;
68: char *krb5_ticket_file;
1.13 markus 69: #endif
1.44 markus 70: void *methoddata;
1.6 markus 71: };
1.42 markus 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: */
1.10 markus 78:
1.39 markus 79: struct Authmethod {
80: char *name;
81: int (*userauth)(Authctxt *authctxt);
82: int *enabled;
83: };
84:
1.10 markus 85: /*
1.16 markus 86: * Keyboard interactive device:
1.25 deraadt 87: * init_ctx returns: non NULL upon success
88: * query returns: 0 - success, otherwise failure
1.16 markus 89: * respond returns: 0 - success, 1 - need further interaction,
90: * otherwise - failure
91: */
92: struct KbdintDevice
93: {
94: const char *name;
1.27 millert 95: void* (*init_ctx)(Authctxt*);
1.28 millert 96: int (*query)(void *ctx, char **name, char **infotxt,
97: u_int *numprompts, char ***prompts, u_int **echo_on);
1.27 millert 98: int (*respond)(void *ctx, u_int numresp, char **responses);
99: void (*free_ctx)(void *ctx);
1.16 markus 100: };
101:
1.35 markus 102: int auth_rhosts(struct passwd *, const char *);
1.15 markus 103: int
1.20 itojun 104: auth_rhosts2(struct passwd *, const char *, const char *, const char *);
1.10 markus 105:
1.48 djm 106: int auth_rhosts_rsa(Authctxt *, char *, Key *);
1.22 markus 107: int auth_password(Authctxt *, const char *);
1.48 djm 108: int auth_rsa(Authctxt *, BIGNUM *);
1.30 markus 109: int auth_rsa_challenge_dialog(Key *);
1.35 markus 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 *);
1.21 dugsong 117:
118: #ifdef KRB5
1.40 itojun 119: int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
1.21 dugsong 120: int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
121: int auth_krb5_password(Authctxt *authctxt, const char *password);
1.47 markus 122: void krb5_cleanup_proc(Authctxt *authctxt);
1.21 dugsong 123: #endif /* KRB5 */
1.6 markus 124:
1.47 markus 125: void do_authentication(Authctxt *);
126: void do_authentication2(Authctxt *);
1.2 markus 127:
1.20 itojun 128: void auth_log(Authctxt *, int, char *, char *);
129: void userauth_finish(Authctxt *, int, char *);
130: int auth_root_allowed(char *);
1.36 djm 131:
132: char *auth2_read_banner(void);
1.6 markus 133:
1.34 provos 134: void privsep_challenge_enable(void);
135:
1.20 itojun 136: int auth2_challenge(Authctxt *, char *);
1.23 markus 137: void auth2_challenge_stop(Authctxt *);
1.35 markus 138: int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
139: int bsdauth_respond(void *, u_int, char **);
140: int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
141: int skey_respond(void *, u_int, char **);
1.1 markus 142:
1.20 itojun 143: int allowed_user(struct passwd *);
1.32 provos 144: struct passwd * getpwnamallow(const char *user);
1.9 markus 145:
1.20 itojun 146: char *get_challenge(Authctxt *);
147: int verify_response(Authctxt *, const char *);
1.17 markus 148:
1.20 itojun 149: char *authorized_keys_file(struct passwd *);
150: char *authorized_keys_file2(struct passwd *);
1.17 markus 151:
152: int
1.20 itojun 153: secure_filename(FILE *, const char *, struct passwd *, char *, size_t);
1.18 markus 154:
155: HostStatus
1.20 itojun 156: check_key_in_hostfiles(struct passwd *, Key *, const char *,
157: const char *, const char *);
1.35 markus 158:
159: /* hostkey handling */
160: Key *get_hostkey_by_index(int);
161: Key *get_hostkey_by_type(int);
162: int get_hostkey_index(Key *);
163: int ssh1_session_key(BIGNUM *);
1.37 markus 164:
165: /* debug messages during authentication */
166: void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
167: void auth_debug_send(void);
168: void auth_debug_reset(void);
1.45 markus 169:
170: struct passwd *fakepw(void);
1.3 markus 171:
172: #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
173:
1.34 provos 174: #define SKEY_PROMPT "\nS/Key Password: "
1.1 markus 175: #endif
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