Annotation of src/usr.bin/ssh/auth.h, Revision 1.59
1.59 ! djm 1: /* $OpenBSD: auth.h,v 1.58 2006/08/18 09:15:20 markus 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 BSD_AUTH
36: #include <bsd_auth.h>
37: #endif
1.21 dugsong 38: #ifdef KRB5
39: #include <krb5.h>
40: #endif
1.13 markus 41:
1.6 markus 42: typedef struct Authctxt Authctxt;
1.39 markus 43: typedef struct Authmethod Authmethod;
1.16 markus 44: typedef struct KbdintDevice KbdintDevice;
45:
1.6 markus 46: struct Authctxt {
1.53 djm 47: sig_atomic_t success;
1.58 markus 48: int authenticated; /* authenticated and alarms cancelled */
1.42 markus 49: int postponed; /* authentication needs another step */
50: int valid; /* user exists and is allowed to login */
1.21 dugsong 51: int attempt;
52: int failures;
1.49 markus 53: int force_pwchange;
1.42 markus 54: char *user; /* username sent by the client */
1.21 dugsong 55: char *service;
1.42 markus 56: struct passwd *pw; /* set if 'valid' */
1.21 dugsong 57: char *style;
58: void *kbdintctxt;
1.13 markus 59: #ifdef BSD_AUTH
1.21 dugsong 60: auth_session_t *as;
61: #endif
62: #ifdef KRB5
63: krb5_context krb5_ctx;
64: krb5_ccache krb5_fwd_ccache;
65: krb5_principal krb5_user;
66: char *krb5_ticket_file;
1.13 markus 67: #endif
1.44 markus 68: void *methoddata;
1.6 markus 69: };
1.42 markus 70: /*
71: * Every authentication method has to handle authentication requests for
72: * non-existing users, or for users that are not allowed to login. In this
73: * case 'valid' is set to 0, but 'user' points to the username requested by
74: * the client.
75: */
1.10 markus 76:
1.39 markus 77: struct Authmethod {
78: char *name;
79: int (*userauth)(Authctxt *authctxt);
80: int *enabled;
81: };
82:
1.10 markus 83: /*
1.16 markus 84: * Keyboard interactive device:
1.25 deraadt 85: * init_ctx returns: non NULL upon success
86: * query returns: 0 - success, otherwise failure
1.16 markus 87: * respond returns: 0 - success, 1 - need further interaction,
88: * otherwise - failure
89: */
90: struct KbdintDevice
91: {
92: const char *name;
1.27 millert 93: void* (*init_ctx)(Authctxt*);
1.28 millert 94: int (*query)(void *ctx, char **name, char **infotxt,
95: u_int *numprompts, char ***prompts, u_int **echo_on);
1.27 millert 96: int (*respond)(void *ctx, u_int numresp, char **responses);
97: void (*free_ctx)(void *ctx);
1.16 markus 98: };
99:
1.35 markus 100: int auth_rhosts(struct passwd *, const char *);
1.15 markus 101: int
1.20 itojun 102: auth_rhosts2(struct passwd *, const char *, const char *, const char *);
1.10 markus 103:
1.48 djm 104: int auth_rhosts_rsa(Authctxt *, char *, Key *);
1.22 markus 105: int auth_password(Authctxt *, const char *);
1.48 djm 106: int auth_rsa(Authctxt *, BIGNUM *);
1.30 markus 107: int auth_rsa_challenge_dialog(Key *);
1.35 markus 108: BIGNUM *auth_rsa_generate_challenge(Key *);
109: int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
110: int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
111:
112: int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
113: int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
114: int user_key_allowed(struct passwd *, Key *);
1.21 dugsong 115:
116: #ifdef KRB5
1.40 itojun 117: int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
1.21 dugsong 118: int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
119: int auth_krb5_password(Authctxt *authctxt, const char *password);
1.47 markus 120: void krb5_cleanup_proc(Authctxt *authctxt);
1.21 dugsong 121: #endif /* KRB5 */
1.6 markus 122:
1.47 markus 123: void do_authentication(Authctxt *);
124: void do_authentication2(Authctxt *);
1.2 markus 125:
1.20 itojun 126: void auth_log(Authctxt *, int, char *, char *);
127: void userauth_finish(Authctxt *, int, char *);
128: int auth_root_allowed(char *);
1.36 djm 129:
130: char *auth2_read_banner(void);
1.6 markus 131:
1.34 provos 132: void privsep_challenge_enable(void);
133:
1.20 itojun 134: int auth2_challenge(Authctxt *, char *);
1.23 markus 135: void auth2_challenge_stop(Authctxt *);
1.35 markus 136: int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
137: int bsdauth_respond(void *, u_int, char **);
138: int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
139: int skey_respond(void *, u_int, char **);
1.1 markus 140:
1.20 itojun 141: int allowed_user(struct passwd *);
1.32 provos 142: struct passwd * getpwnamallow(const char *user);
1.9 markus 143:
1.20 itojun 144: char *get_challenge(Authctxt *);
145: int verify_response(Authctxt *, const char *);
1.17 markus 146:
1.20 itojun 147: char *authorized_keys_file(struct passwd *);
148: char *authorized_keys_file2(struct passwd *);
1.17 markus 149:
150: int
1.20 itojun 151: secure_filename(FILE *, const char *, struct passwd *, char *, size_t);
1.18 markus 152:
153: HostStatus
1.20 itojun 154: check_key_in_hostfiles(struct passwd *, Key *, const char *,
155: const char *, const char *);
1.35 markus 156:
157: /* hostkey handling */
158: Key *get_hostkey_by_index(int);
159: Key *get_hostkey_by_type(int);
160: int get_hostkey_index(Key *);
161: int ssh1_session_key(BIGNUM *);
1.37 markus 162:
163: /* debug messages during authentication */
164: void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
165: void auth_debug_send(void);
166: void auth_debug_reset(void);
1.45 markus 167:
168: struct passwd *fakepw(void);
1.3 markus 169:
170: #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
171:
1.34 provos 172: #define SKEY_PROMPT "\nS/Key Password: "
1.1 markus 173: #endif
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