crypto/external/bsd/openssh/dist/auth.h

   1 /*      $NetBSD$        */
   2 /* $OpenBSD: auth.h,v 1.62 2008/11/04 08:22:12 djm Exp $ */
   3
   4 /*
   5  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  *
  27  */
  28
  29 #ifndef AUTH_H
  30 #define AUTH_H
  31
  32 #include <signal.h>
  33
  34 #include <openssl/rsa.h>
  35
  36 #ifdef HAVE_LOGIN_CAP
  37 #include <login_cap.h>
  38 #endif
  39 #ifdef BSD_AUTH
  40 #include <bsd_auth.h>
  41 #endif
  42 #ifdef KRB5
  43 #include <krb5.h>
  44 #endif
  45
  46 typedef struct Authctxt Authctxt;
  47 typedef struct Authmethod Authmethod;
  48 typedef struct KbdintDevice KbdintDevice;
  49
  50 struct Authctxt {
  51         sig_atomic_t     success;
  52         int              authenticated; /* authenticated and alarms cancelled */
  53         int              postponed;     /* authentication needs another step */
  54         int              valid;         /* user exists and is allowed to login */
  55         int              attempt;
  56         int              failures;
  57         int              force_pwchange;
  58         char            *user;          /* username sent by the client */
  59         char            *service;
  60         struct passwd   *pw;            /* set if 'valid' */
  61         char            *style;
  62         void            *kbdintctxt;
  63         void            *jpake_ctx;
  64 #ifdef BSD_AUTH
  65         auth_session_t  *as;
  66 #endif
  67 #ifdef KRB4
  68         char            *krb4_ticket_file;
  69 #endif
  70 #ifdef KRB5
  71         krb5_context     krb5_ctx;
  72         krb5_auth_context krb5_auth_ctx;
  73         krb5_ccache      krb5_fwd_ccache;
  74         krb5_principal   krb5_user;
  75         char            *krb5_ticket_file;
  76 #endif
  77         void            *methoddata;
  78 };
  79 /*
  80  * Every authentication method has to handle authentication requests for
  81  * non-existing users, or for users that are not allowed to login. In this
  82  * case 'valid' is set to 0, but 'user' points to the username requested by
  83  * the client.
  84  */
  85
  86 #ifdef USE_PAM
  87 #include "auth-pam.h"
  88 #endif
  89
  90 struct Authmethod {
  91         char    *name;
  92         int     (*userauth)(Authctxt *authctxt);
  93         int     *enabled;
  94 };
  95
  96 /*
  97  * Keyboard interactive device:
  98  * init_ctx     returns: non NULL upon success
  99  * query        returns: 0 - success, otherwise failure
 100  * respond      returns: 0 - success, 1 - need further interaction,
 101  *              otherwise - failure
 102  */
 103 struct KbdintDevice
 104 {
 105         const char *name;
 106         void*   (*init_ctx)(Authctxt*);
 107         int     (*query)(void *ctx, char **name, char **infotxt,
 108                     u_int *numprompts, char ***prompts, u_int **echo_on);
 109         int     (*respond)(void *ctx, u_int numresp, char **responses);
 110         void    (*free_ctx)(void *ctx);
 111 };
 112
 113 void     disable_forwarding(void);
 114 int      auth_rhosts(struct passwd *, const char *);
 115 int
 116 auth_rhosts2(struct passwd *, const char *, const char *, const char *);
 117
 118 int      auth_rhosts_rsa(Authctxt *, char *, Key *);
 119 int      auth_password(Authctxt *, const char *);
 120 int      auth_rsa(Authctxt *, BIGNUM *);
 121 int      auth_rsa_challenge_dialog(Key *);
 122 BIGNUM  *auth_rsa_generate_challenge(Key *);
 123 int      auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
 124 int      auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
 125
 126 int      auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
 127 int      hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
 128 int      user_key_allowed(struct passwd *, Key *);
 129
 130 #ifdef KRB4
 131 #include <krb.h>
 132 int     auth_krb4(Authctxt *, KTEXT, char **, KTEXT);
 133 int     auth_krb4_password(Authctxt *, const char *);
 134 void    krb4_cleanup_proc(void *);
 135
 136 #ifdef AFS
 137 #include <kafs.h>
 138 int     auth_krb4_tgt(Authctxt *, const char *);
 139 int     auth_afs_token(Authctxt *, const char *);
 140 #endif /* AFS */
 141
 142 #endif /* KRB4 */
 143
 144 #ifdef KRB5
 145 int     auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
 146 int     auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
 147 int     auth_krb5_password(Authctxt *authctxt, const char *password);
 148 void    krb5_cleanup_proc(Authctxt *authctxt);
 149 #endif /* KRB5 */
 150
 151 void    do_authentication(Authctxt *);
 152 void    do_authentication2(Authctxt *);
 153
 154 void    auth_log(Authctxt *, int, char *, char *);
 155 void    userauth_finish(Authctxt *, int, char *);
 156 void    userauth_send_banner(const char *);
 157 int     auth_root_allowed(char *);
 158
 159 char    *auth2_read_banner(void);
 160
 161 void    privsep_challenge_enable(void);
 162
 163 int     auth2_challenge(Authctxt *, char *);
 164 void    auth2_challenge_stop(Authctxt *);
 165 int     bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
 166 int     bsdauth_respond(void *, u_int, char **);
 167 int     skey_query(void *, char **, char **, u_int *, char ***, u_int **);
 168 int     skey_respond(void *, u_int, char **);
 169
 170 void    auth2_jpake_get_pwdata(Authctxt *, BIGNUM **, char **, char **);
 171 void    auth2_jpake_stop(Authctxt *);
 172
 173 int     allowed_user(struct passwd *);
 174 struct passwd * getpwnamallow(const char *user);
 175
 176 char    *get_challenge(Authctxt *);
 177 int     verify_response(Authctxt *, const char *);
 178
 179 char    *authorized_keys_file(struct passwd *);
 180 char    *authorized_keys_file2(struct passwd *);
 181
 182 FILE    *auth_openkeyfile(const char *, struct passwd *, int);
 183
 184 HostStatus
 185 check_key_in_hostfiles(struct passwd *, Key *, const char *,
 186     const char *, const char *);
 187
 188 /* hostkey handling */
 189 Key     *get_hostkey_by_index(int);
 190 Key     *get_hostkey_by_type(int);
 191 int      get_hostkey_index(Key *);
 192 int      ssh1_session_key(BIGNUM *);
 193
 194 /* debug messages during authentication */
 195 void     auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
 196 void     auth_debug_send(void);
 197 void     auth_debug_reset(void);
 198
 199 struct passwd *fakepw(void);
 200
 201 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
 202
 203 #define SKEY_PROMPT "\nS/Key Password: "
 204
 205 #if defined(KRB5) && !defined(HEIMDAL)
 206 #include <krb5.h>
 207 krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *);
 208 #endif
 209 #endif