Annotation of src/usr.bin/ssh/auth.h, Revision 1.100
1.100 ! djm 1: /* $OpenBSD: auth.h,v 1.99 2019/01/19 21:43:56 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>
1.10 markus 32:
1.13 markus 33: #include <bsd_auth.h>
1.21 dugsong 34: #ifdef KRB5
35: #include <krb5.h>
36: #endif
1.13 markus 37:
1.95 djm 38: struct passwd;
1.80 markus 39: struct ssh;
1.95 djm 40: struct sshbuf;
1.79 djm 41: struct sshkey;
1.95 djm 42: struct sshauthopt;
1.79 djm 43:
1.6 markus 44: typedef struct Authctxt Authctxt;
1.39 markus 45: typedef struct Authmethod Authmethod;
1.16 markus 46: typedef struct KbdintDevice KbdintDevice;
47:
1.6 markus 48: struct Authctxt {
1.53 djm 49: sig_atomic_t success;
1.58 markus 50: int authenticated; /* authenticated and alarms cancelled */
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;
1.84 djm 55: int server_caused_failure;
1.49 markus 56: int force_pwchange;
1.42 markus 57: char *user; /* username sent by the client */
1.21 dugsong 58: char *service;
1.42 markus 59: struct passwd *pw; /* set if 'valid' */
1.21 dugsong 60: char *style;
1.92 djm 61:
62: /* Method lists for multiple authentication */
63: char **auth_methods; /* modified from server config */
64: u_int num_auth_methods;
65:
66: /* Authentication method-specific data */
67: void *methoddata;
1.21 dugsong 68: void *kbdintctxt;
69: auth_session_t *as;
70: #ifdef KRB5
71: krb5_context krb5_ctx;
72: krb5_ccache krb5_fwd_ccache;
73: krb5_principal krb5_user;
74: char *krb5_ticket_file;
1.13 markus 75: #endif
1.79 djm 76:
1.92 djm 77: /* Authentication keys already used; these will be refused henceforth */
78: struct sshkey **prev_keys;
79: u_int nprev_keys;
80:
1.96 djm 81: /* Last used key and ancillary information from active auth method */
1.92 djm 82: struct sshkey *auth_method_key;
83: char *auth_method_info;
84:
85: /* Information exposed to session */
86: struct sshbuf *session_info; /* Auth info for environment */
1.6 markus 87: };
1.92 djm 88:
1.42 markus 89: /*
90: * Every authentication method has to handle authentication requests for
91: * non-existing users, or for users that are not allowed to login. In this
92: * case 'valid' is set to 0, but 'user' points to the username requested by
93: * the client.
94: */
1.10 markus 95:
1.39 markus 96: struct Authmethod {
97: char *name;
1.91 markus 98: int (*userauth)(struct ssh *);
1.39 markus 99: int *enabled;
100: };
101:
1.10 markus 102: /*
1.16 markus 103: * Keyboard interactive device:
1.25 deraadt 104: * init_ctx returns: non NULL upon success
105: * query returns: 0 - success, otherwise failure
1.16 markus 106: * respond returns: 0 - success, 1 - need further interaction,
107: * otherwise - failure
108: */
109: struct KbdintDevice
110: {
111: const char *name;
1.27 millert 112: void* (*init_ctx)(Authctxt*);
1.28 millert 113: int (*query)(void *ctx, char **name, char **infotxt,
114: u_int *numprompts, char ***prompts, u_int **echo_on);
1.27 millert 115: int (*respond)(void *ctx, u_int numresp, char **responses);
116: void (*free_ctx)(void *ctx);
1.16 markus 117: };
118:
1.15 markus 119: int
1.20 itojun 120: auth_rhosts2(struct passwd *, const char *, const char *, const char *);
1.10 markus 121:
1.95 djm 122: int auth_password(struct ssh *, const char *);
1.35 markus 123:
1.99 djm 124: int hostbased_key_allowed(struct ssh *, struct passwd *,
125: const char *, char *, struct sshkey *);
1.95 djm 126: int user_key_allowed(struct ssh *, struct passwd *, struct sshkey *, int,
127: struct sshauthopt **);
1.92 djm 128: int auth2_key_already_used(Authctxt *, const struct sshkey *);
129:
130: /*
131: * Handling auth method-specific information for logging and prevention
132: * of key reuse during multiple authentication.
133: */
134: void auth2_authctxt_reset_info(Authctxt *);
135: void auth2_record_key(Authctxt *, int, const struct sshkey *);
136: void auth2_record_info(Authctxt *authctxt, const char *, ...)
137: __attribute__((__format__ (printf, 2, 3)))
138: __attribute__((__nonnull__ (2)));
139: void auth2_update_session_info(Authctxt *, const char *, const char *);
1.21 dugsong 140:
141: #ifdef KRB5
1.40 itojun 142: int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
1.21 dugsong 143: int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
144: int auth_krb5_password(Authctxt *authctxt, const char *password);
1.47 markus 145: void krb5_cleanup_proc(Authctxt *authctxt);
1.21 dugsong 146: #endif /* KRB5 */
1.6 markus 147:
1.97 djm 148: void do_authentication2(struct ssh *);
1.2 markus 149:
1.98 djm 150: void auth_log(struct ssh *, int, int, const char *, const char *);
151: void auth_maxtries_exceeded(struct ssh *) __attribute__((noreturn));
1.91 markus 152: void userauth_finish(struct ssh *, int, const char *, const char *);
1.95 djm 153: int auth_root_allowed(struct ssh *, const char *);
1.36 djm 154:
155: char *auth2_read_banner(void);
1.71 djm 156: int auth2_methods_valid(const char *, int);
1.73 markus 157: int auth2_update_methods_lists(Authctxt *, const char *, const char *);
1.71 djm 158: int auth2_setup_methods_lists(Authctxt *);
1.73 markus 159: int auth2_method_allowed(Authctxt *, const char *, const char *);
1.6 markus 160:
1.34 provos 161: void privsep_challenge_enable(void);
162:
1.91 markus 163: int auth2_challenge(struct ssh *, char *);
164: void auth2_challenge_stop(struct ssh *);
1.35 markus 165: int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
166: int bsdauth_respond(void *, u_int, char **);
1.1 markus 167:
1.98 djm 168: int allowed_user(struct ssh *, struct passwd *);
169: struct passwd * getpwnamallow(struct ssh *, const char *user);
1.9 markus 170:
1.69 djm 171: char *expand_authorized_keys(const char *, struct passwd *pw);
1.66 djm 172: char *authorized_principals_file(struct passwd *);
1.17 markus 173:
1.61 dtucker 174: FILE *auth_openkeyfile(const char *, struct passwd *, int);
1.66 djm 175: FILE *auth_openprincipals(const char *, struct passwd *, int);
1.90 markus 176: int auth_key_is_revoked(struct sshkey *);
1.87 djm 177:
178: const char *auth_get_canonical_hostname(struct ssh *, int);
1.18 markus 179:
180: HostStatus
1.90 markus 181: check_key_in_hostfiles(struct passwd *, struct sshkey *, const char *,
1.20 itojun 182: const char *, const char *);
1.35 markus 183:
184: /* hostkey handling */
1.90 markus 185: struct sshkey *get_hostkey_by_index(int);
186: struct sshkey *get_hostkey_public_by_index(int, struct ssh *);
187: struct sshkey *get_hostkey_public_by_type(int, int, struct ssh *);
188: struct sshkey *get_hostkey_private_by_type(int, int, struct ssh *);
189: int get_hostkey_index(struct sshkey *, int, struct ssh *);
1.99 djm 190: int sshd_hostkey_sign(struct ssh *, struct sshkey *, struct sshkey *,
191: u_char **, size_t *, const u_char *, size_t, const char *);
1.37 markus 192:
1.95 djm 193: /* Key / cert options linkage to auth layer */
194: const struct sshauthopt *auth_options(struct ssh *);
195: int auth_activate_options(struct ssh *, struct sshauthopt *);
196: void auth_restrict_session(struct ssh *);
197: int auth_authorise_keyopts(struct ssh *, struct passwd *pw,
198: struct sshauthopt *, int, const char *);
199: void auth_log_authopts(const char *, const struct sshauthopt *, int);
200:
1.37 markus 201: /* debug messages during authentication */
1.95 djm 202: void auth_debug_add(const char *fmt,...)
203: __attribute__((format(printf, 1, 2)));
1.98 djm 204: void auth_debug_send(struct ssh *);
1.37 markus 205: void auth_debug_reset(void);
1.45 markus 206:
207: struct passwd *fakepw(void);
1.94 markus 208:
209: #define SSH_SUBPROCESS_STDOUT_DISCARD (1) /* Discard stdout */
210: #define SSH_SUBPROCESS_STDOUT_CAPTURE (1<<1) /* Redirect stdout */
211: #define SSH_SUBPROCESS_STDERR_DISCARD (1<<2) /* Discard stderr */
212: pid_t subprocess(const char *, struct passwd *,
213: const char *, int, char **, FILE **, u_int flags);
1.3 markus 214:
1.1 markus 215: #endif
![[BACK]](/icons/back.gif){kind=icon}
Return to auth.h CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh