Annotation of src/usr.bin/ssh/auth.h, Revision 1.94
1.94 ! markus 1: /* $OpenBSD: auth.h,v 1.93 2017/08/18 05:36:45 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;
1.92 djm 60:
61: /* Method lists for multiple authentication */
62: char **auth_methods; /* modified from server config */
63: u_int num_auth_methods;
64:
65: /* Authentication method-specific data */
66: void *methoddata;
1.21 dugsong 67: void *kbdintctxt;
68: auth_session_t *as;
69: #ifdef KRB5
70: krb5_context krb5_ctx;
71: krb5_ccache krb5_fwd_ccache;
72: krb5_principal krb5_user;
73: char *krb5_ticket_file;
1.13 markus 74: #endif
1.79 djm 75:
1.92 djm 76: /* Authentication keys already used; these will be refused henceforth */
77: struct sshkey **prev_keys;
78: u_int nprev_keys;
79:
80: /* Last used key and ancilliary information from active auth method */
81: struct sshkey *auth_method_key;
82: char *auth_method_info;
83:
84: /* Information exposed to session */
85: struct sshbuf *session_info; /* Auth info for environment */
1.6 markus 86: };
1.92 djm 87:
1.42 markus 88: /*
89: * Every authentication method has to handle authentication requests for
90: * non-existing users, or for users that are not allowed to login. In this
91: * case 'valid' is set to 0, but 'user' points to the username requested by
92: * the client.
93: */
1.10 markus 94:
1.39 markus 95: struct Authmethod {
96: char *name;
1.91 markus 97: int (*userauth)(struct ssh *);
1.39 markus 98: int *enabled;
99: };
100:
1.10 markus 101: /*
1.16 markus 102: * Keyboard interactive device:
1.25 deraadt 103: * init_ctx returns: non NULL upon success
104: * query returns: 0 - success, otherwise failure
1.16 markus 105: * respond returns: 0 - success, 1 - need further interaction,
106: * otherwise - failure
107: */
108: struct KbdintDevice
109: {
110: const char *name;
1.27 millert 111: void* (*init_ctx)(Authctxt*);
1.28 millert 112: int (*query)(void *ctx, char **name, char **infotxt,
113: u_int *numprompts, char ***prompts, u_int **echo_on);
1.27 millert 114: int (*respond)(void *ctx, u_int numresp, char **responses);
115: void (*free_ctx)(void *ctx);
1.16 markus 116: };
117:
1.15 markus 118: int
1.20 itojun 119: auth_rhosts2(struct passwd *, const char *, const char *, const char *);
1.10 markus 120:
1.22 markus 121: int auth_password(Authctxt *, const char *);
1.35 markus 122:
1.90 markus 123: int hostbased_key_allowed(struct passwd *, const char *, char *,
124: struct sshkey *);
125: int user_key_allowed(struct passwd *, struct sshkey *, int);
1.92 djm 126: int auth2_key_already_used(Authctxt *, const struct sshkey *);
127:
128: /*
129: * Handling auth method-specific information for logging and prevention
130: * of key reuse during multiple authentication.
131: */
132: void auth2_authctxt_reset_info(Authctxt *);
133: void auth2_record_key(Authctxt *, int, const struct sshkey *);
134: void auth2_record_info(Authctxt *authctxt, const char *, ...)
135: __attribute__((__format__ (printf, 2, 3)))
136: __attribute__((__nonnull__ (2)));
137: void auth2_update_session_info(Authctxt *, const char *, const char *);
1.21 dugsong 138:
139: #ifdef KRB5
1.40 itojun 140: int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
1.21 dugsong 141: int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
142: int auth_krb5_password(Authctxt *authctxt, const char *password);
1.47 markus 143: void krb5_cleanup_proc(Authctxt *authctxt);
1.21 dugsong 144: #endif /* KRB5 */
1.6 markus 145:
1.47 markus 146: void do_authentication2(Authctxt *);
1.2 markus 147:
1.74 djm 148: void auth_log(Authctxt *, int, int, const char *, const char *);
1.78 djm 149: void auth_maxtries_exceeded(Authctxt *) __attribute__((noreturn));
1.91 markus 150: void userauth_finish(struct ssh *, int, const char *, const char *);
1.72 djm 151: int auth_root_allowed(const char *);
1.36 djm 152:
153: char *auth2_read_banner(void);
1.71 djm 154: int auth2_methods_valid(const char *, int);
1.73 markus 155: int auth2_update_methods_lists(Authctxt *, const char *, const char *);
1.71 djm 156: int auth2_setup_methods_lists(Authctxt *);
1.73 markus 157: int auth2_method_allowed(Authctxt *, const char *, const char *);
1.6 markus 158:
1.34 provos 159: void privsep_challenge_enable(void);
160:
1.91 markus 161: int auth2_challenge(struct ssh *, char *);
162: void auth2_challenge_stop(struct ssh *);
1.35 markus 163: int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
164: int bsdauth_respond(void *, u_int, char **);
1.1 markus 165:
1.20 itojun 166: int allowed_user(struct passwd *);
1.32 provos 167: struct passwd * getpwnamallow(const char *user);
1.9 markus 168:
1.69 djm 169: char *expand_authorized_keys(const char *, struct passwd *pw);
1.66 djm 170: char *authorized_principals_file(struct passwd *);
1.17 markus 171:
1.61 dtucker 172: FILE *auth_openkeyfile(const char *, struct passwd *, int);
1.66 djm 173: FILE *auth_openprincipals(const char *, struct passwd *, int);
1.90 markus 174: int auth_key_is_revoked(struct sshkey *);
1.87 djm 175:
176: const char *auth_get_canonical_hostname(struct ssh *, int);
1.18 markus 177:
178: HostStatus
1.90 markus 179: check_key_in_hostfiles(struct passwd *, struct sshkey *, const char *,
1.20 itojun 180: const char *, const char *);
1.35 markus 181:
182: /* hostkey handling */
1.90 markus 183: struct sshkey *get_hostkey_by_index(int);
184: struct sshkey *get_hostkey_public_by_index(int, struct ssh *);
185: struct sshkey *get_hostkey_public_by_type(int, int, struct ssh *);
186: struct sshkey *get_hostkey_private_by_type(int, int, struct ssh *);
187: int get_hostkey_index(struct sshkey *, int, struct ssh *);
188: int sshd_hostkey_sign(struct sshkey *, struct sshkey *, u_char **,
189: size_t *, const u_char *, size_t, const char *, u_int);
1.37 markus 190:
191: /* debug messages during authentication */
192: void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
193: void auth_debug_send(void);
194: void auth_debug_reset(void);
1.45 markus 195:
196: struct passwd *fakepw(void);
1.94 ! markus 197:
! 198: #define SSH_SUBPROCESS_STDOUT_DISCARD (1) /* Discard stdout */
! 199: #define SSH_SUBPROCESS_STDOUT_CAPTURE (1<<1) /* Redirect stdout */
! 200: #define SSH_SUBPROCESS_STDERR_DISCARD (1<<2) /* Discard stderr */
! 201: pid_t subprocess(const char *, struct passwd *,
! 202: const char *, int, char **, FILE **, u_int flags);
1.3 markus 203:
1.1 markus 204: #endif
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