Annotation of src/usr.bin/ssh/auth.h, Revision 1.86
1.86 ! markus 1: /* $OpenBSD: auth.h,v 1.85 2015/11/11 01:48:01 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:
1.80 markus 40: struct ssh;
1.79 djm 41: struct sshkey;
42:
1.6 markus 43: typedef struct Authctxt Authctxt;
1.39 markus 44: typedef struct Authmethod Authmethod;
1.16 markus 45: typedef struct KbdintDevice KbdintDevice;
46:
1.6 markus 47: struct Authctxt {
1.53 djm 48: sig_atomic_t success;
1.58 markus 49: int authenticated; /* authenticated and alarms cancelled */
1.42 markus 50: int postponed; /* authentication needs another step */
51: int valid; /* user exists and is allowed to login */
1.21 dugsong 52: int attempt;
53: int failures;
1.84 djm 54: int server_caused_failure;
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;
1.74 djm 61: char *info; /* Extra info for next auth_log */
1.21 dugsong 62: auth_session_t *as;
1.71 djm 63: char **auth_methods; /* modified from server config */
64: u_int num_auth_methods;
1.21 dugsong 65: #ifdef KRB5
66: krb5_context krb5_ctx;
67: krb5_ccache krb5_fwd_ccache;
68: krb5_principal krb5_user;
69: char *krb5_ticket_file;
1.13 markus 70: #endif
1.44 markus 71: void *methoddata;
1.79 djm 72:
73: struct sshkey **prev_userkeys;
74: u_int nprev_userkeys;
1.6 markus 75: };
1.42 markus 76: /*
77: * Every authentication method has to handle authentication requests for
78: * non-existing users, or for users that are not allowed to login. In this
79: * case 'valid' is set to 0, but 'user' points to the username requested by
80: * the client.
81: */
1.10 markus 82:
1.39 markus 83: struct Authmethod {
84: char *name;
85: int (*userauth)(Authctxt *authctxt);
86: int *enabled;
87: };
88:
1.10 markus 89: /*
1.16 markus 90: * Keyboard interactive device:
1.25 deraadt 91: * init_ctx returns: non NULL upon success
92: * query returns: 0 - success, otherwise failure
1.16 markus 93: * respond returns: 0 - success, 1 - need further interaction,
94: * otherwise - failure
95: */
96: struct KbdintDevice
97: {
98: const char *name;
1.27 millert 99: void* (*init_ctx)(Authctxt*);
1.28 millert 100: int (*query)(void *ctx, char **name, char **infotxt,
101: u_int *numprompts, char ***prompts, u_int **echo_on);
1.27 millert 102: int (*respond)(void *ctx, u_int numresp, char **responses);
103: void (*free_ctx)(void *ctx);
1.16 markus 104: };
105:
1.35 markus 106: int auth_rhosts(struct passwd *, const char *);
1.15 markus 107: int
1.20 itojun 108: auth_rhosts2(struct passwd *, const char *, const char *, const char *);
1.10 markus 109:
1.48 djm 110: int auth_rhosts_rsa(Authctxt *, char *, Key *);
1.22 markus 111: int auth_password(Authctxt *, const char *);
1.48 djm 112: int auth_rsa(Authctxt *, BIGNUM *);
1.30 markus 113: int auth_rsa_challenge_dialog(Key *);
1.35 markus 114: BIGNUM *auth_rsa_generate_challenge(Key *);
115: int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
116: int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
117:
118: int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
119: int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
1.83 djm 120: int user_key_allowed(struct passwd *, Key *, int);
1.75 djm 121: void pubkey_auth_info(Authctxt *, const Key *, const char *, ...)
122: __attribute__((__format__ (printf, 3, 4)));
1.79 djm 123: void auth2_record_userkey(Authctxt *, struct sshkey *);
124: int auth2_userkey_already_used(Authctxt *, struct sshkey *);
1.70 djm 125:
126: struct stat;
127: int auth_secure_path(const char *, struct stat *, const char *, uid_t,
128: char *, size_t);
1.21 dugsong 129:
130: #ifdef KRB5
1.40 itojun 131: int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
1.21 dugsong 132: int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
133: int auth_krb5_password(Authctxt *authctxt, const char *password);
1.47 markus 134: void krb5_cleanup_proc(Authctxt *authctxt);
1.21 dugsong 135: #endif /* KRB5 */
1.6 markus 136:
1.47 markus 137: void do_authentication(Authctxt *);
138: void do_authentication2(Authctxt *);
1.2 markus 139:
1.74 djm 140: void auth_info(Authctxt *authctxt, const char *, ...)
141: __attribute__((__format__ (printf, 2, 3)))
142: __attribute__((__nonnull__ (2)));
143: void auth_log(Authctxt *, int, int, const char *, const char *);
1.78 djm 144: void auth_maxtries_exceeded(Authctxt *) __attribute__((noreturn));
1.72 djm 145: void userauth_finish(Authctxt *, int, const char *, const char *);
146: int auth_root_allowed(const char *);
1.36 djm 147:
148: char *auth2_read_banner(void);
1.71 djm 149: int auth2_methods_valid(const char *, int);
1.73 markus 150: int auth2_update_methods_lists(Authctxt *, const char *, const char *);
1.71 djm 151: int auth2_setup_methods_lists(Authctxt *);
1.73 markus 152: int auth2_method_allowed(Authctxt *, const char *, const char *);
1.6 markus 153:
1.34 provos 154: void privsep_challenge_enable(void);
155:
1.20 itojun 156: int auth2_challenge(Authctxt *, char *);
1.23 markus 157: void auth2_challenge_stop(Authctxt *);
1.35 markus 158: int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
159: int bsdauth_respond(void *, u_int, char **);
1.1 markus 160:
1.20 itojun 161: int allowed_user(struct passwd *);
1.32 provos 162: struct passwd * getpwnamallow(const char *user);
1.9 markus 163:
1.20 itojun 164: char *get_challenge(Authctxt *);
165: int verify_response(Authctxt *, const char *);
1.17 markus 166:
1.69 djm 167: char *expand_authorized_keys(const char *, struct passwd *pw);
1.66 djm 168: char *authorized_principals_file(struct passwd *);
1.17 markus 169:
1.61 dtucker 170: FILE *auth_openkeyfile(const char *, struct passwd *, int);
1.66 djm 171: FILE *auth_openprincipals(const char *, struct passwd *, int);
1.65 djm 172: int auth_key_is_revoked(Key *);
1.18 markus 173:
174: HostStatus
1.20 itojun 175: check_key_in_hostfiles(struct passwd *, Key *, const char *,
176: const char *, const char *);
1.35 markus 177:
178: /* hostkey handling */
179: Key *get_hostkey_by_index(int);
1.80 markus 180: Key *get_hostkey_public_by_index(int, struct ssh *);
1.81 djm 181: Key *get_hostkey_public_by_type(int, int, struct ssh *);
182: Key *get_hostkey_private_by_type(int, int, struct ssh *);
1.82 djm 183: int get_hostkey_index(Key *, int, struct ssh *);
1.35 markus 184: int ssh1_session_key(BIGNUM *);
1.82 djm 185: int sshd_hostkey_sign(Key *, Key *, u_char **, size_t *,
1.86 ! markus 186: const u_char *, size_t, const char *, u_int);
1.37 markus 187:
188: /* debug messages during authentication */
189: void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
190: void auth_debug_send(void);
191: void auth_debug_reset(void);
1.45 markus 192:
193: struct passwd *fakepw(void);
1.3 markus 194:
1.1 markus 195: #endif
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