Annotation of src/usr.bin/ssh/auth.h, Revision 1.72
1.72 ! djm 1: /* $OpenBSD: auth.h,v 1.71 2012/11/04 11:09:15 djm 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: #include <bsd_auth.h>
1.21 dugsong 36: #ifdef KRB5
37: #include <krb5.h>
38: #endif
1.13 markus 39:
1.6 markus 40: typedef struct Authctxt Authctxt;
1.39 markus 41: typedef struct Authmethod Authmethod;
1.16 markus 42: typedef struct KbdintDevice KbdintDevice;
43:
1.6 markus 44: struct Authctxt {
1.53 djm 45: sig_atomic_t success;
1.58 markus 46: int authenticated; /* authenticated and alarms cancelled */
1.42 markus 47: int postponed; /* authentication needs another step */
48: int valid; /* user exists and is allowed to login */
1.21 dugsong 49: int attempt;
50: int failures;
1.67 djm 51: int server_caused_failure;
1.49 markus 52: int force_pwchange;
1.42 markus 53: char *user; /* username sent by the client */
1.21 dugsong 54: char *service;
1.42 markus 55: struct passwd *pw; /* set if 'valid' */
1.21 dugsong 56: char *style;
57: void *kbdintctxt;
1.62 djm 58: void *jpake_ctx;
1.21 dugsong 59: auth_session_t *as;
1.71 djm 60: char **auth_methods; /* modified from server config */
61: u_int num_auth_methods;
1.21 dugsong 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 *);
1.70 djm 115:
116: struct stat;
117: int auth_secure_path(const char *, struct stat *, const char *, uid_t,
118: char *, size_t);
1.21 dugsong 119:
120: #ifdef KRB5
1.40 itojun 121: int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
1.21 dugsong 122: int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
123: int auth_krb5_password(Authctxt *authctxt, const char *password);
1.47 markus 124: void krb5_cleanup_proc(Authctxt *authctxt);
1.21 dugsong 125: #endif /* KRB5 */
1.6 markus 126:
1.47 markus 127: void do_authentication(Authctxt *);
128: void do_authentication2(Authctxt *);
1.2 markus 129:
1.72 ! djm 130: void auth_log(Authctxt *, int, int, const char *, const char *,
! 131: const char *);
! 132: void userauth_finish(Authctxt *, int, const char *, const char *);
! 133: int auth_root_allowed(const char *);
1.36 djm 134:
135: char *auth2_read_banner(void);
1.71 djm 136: int auth2_methods_valid(const char *, int);
137: int auth2_update_methods_lists(Authctxt *, const char *);
138: int auth2_setup_methods_lists(Authctxt *);
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 **);
1.62 djm 148:
149: void auth2_jpake_get_pwdata(Authctxt *, BIGNUM **, char **, char **);
150: void auth2_jpake_stop(Authctxt *);
1.1 markus 151:
1.20 itojun 152: int allowed_user(struct passwd *);
1.32 provos 153: struct passwd * getpwnamallow(const char *user);
1.9 markus 154:
1.20 itojun 155: char *get_challenge(Authctxt *);
156: int verify_response(Authctxt *, const char *);
1.17 markus 157:
1.69 djm 158: char *expand_authorized_keys(const char *, struct passwd *pw);
1.66 djm 159: char *authorized_principals_file(struct passwd *);
1.17 markus 160:
1.61 dtucker 161: FILE *auth_openkeyfile(const char *, struct passwd *, int);
1.66 djm 162: FILE *auth_openprincipals(const char *, struct passwd *, int);
1.65 djm 163: int auth_key_is_revoked(Key *);
1.18 markus 164:
165: HostStatus
1.20 itojun 166: check_key_in_hostfiles(struct passwd *, Key *, const char *,
167: const char *, const char *);
1.35 markus 168:
169: /* hostkey handling */
170: Key *get_hostkey_by_index(int);
1.64 djm 171: Key *get_hostkey_public_by_type(int);
172: Key *get_hostkey_private_by_type(int);
1.35 markus 173: int get_hostkey_index(Key *);
174: int ssh1_session_key(BIGNUM *);
1.37 markus 175:
176: /* debug messages during authentication */
177: void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
178: void auth_debug_send(void);
179: void auth_debug_reset(void);
1.45 markus 180:
181: struct passwd *fakepw(void);
1.3 markus 182:
183: #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
184:
1.1 markus 185: #endif
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