1 /* $NetBSD: auth.h,v 1.5 2011/09/07 17:49:19 christos Exp $ */ 2 /* $OpenBSD: auth.h,v 1.69 2011/05/23 03:30:07 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 server_caused_failure; 58 int force_pwchange; 59 char *user; /* username sent by the client */ 60 char *service; 61 struct passwd *pw; /* set if 'valid' */ 62 char *style; 63 void *kbdintctxt; 64 void *jpake_ctx; 65 #ifdef BSD_AUTH 66 auth_session_t *as; 67 #endif 68 #ifdef KRB4 69 char *krb4_ticket_file; 70 #endif 71 #ifdef KRB5 72 krb5_context krb5_ctx; 73 krb5_auth_context krb5_auth_ctx; 74 krb5_ccache krb5_fwd_ccache; 75 krb5_principal krb5_user; 76 char *krb5_ticket_file; 77 #endif 78 void *methoddata; 79 }; 80 /* 81 * Every authentication method has to handle authentication requests for 82 * non-existing users, or for users that are not allowed to login. In this 83 * case 'valid' is set to 0, but 'user' points to the username requested by 84 * the client. 85 */ 86 87 #ifdef USE_PAM 88 #include "auth-pam.h" 89 #endif 90 91 struct Authmethod { 92 const char *name; 93 int (*userauth)(Authctxt *authctxt); 94 int *enabled; 95 }; 96 97 /* 98 * Keyboard interactive device: 99 * init_ctx returns: non NULL upon success 100 * query returns: 0 - success, otherwise failure 101 * respond returns: 0 - success, 1 - need further interaction, 102 * otherwise - failure 103 */ 104 struct KbdintDevice 105 { 106 const char *name; 107 void* (*init_ctx)(Authctxt*); 108 int (*query)(void *ctx, char **name, char **infotxt, 109 u_int *numprompts, char ***prompts, u_int **echo_on); 110 int (*respond)(void *ctx, u_int numresp, char **responses); 111 void (*free_ctx)(void *ctx); 112 }; 113 114 void disable_forwarding(void); 115 int auth_rhosts(struct passwd *, const char *); 116 int 117 auth_rhosts2(struct passwd *, const char *, const char *, const char *); 118 119 int auth_rhosts_rsa(Authctxt *, char *, Key *); 120 int auth_password(Authctxt *, const char *); 121 int auth_rsa(Authctxt *, BIGNUM *); 122 int auth_rsa_challenge_dialog(Key *); 123 BIGNUM *auth_rsa_generate_challenge(Key *); 124 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 125 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 126 127 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 128 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 129 int user_key_allowed(struct passwd *, Key *); 130 131 #ifdef KRB4 132 #include <krb.h> 133 int auth_krb4(Authctxt *, KTEXT, char **, KTEXT); 134 int auth_krb4_password(Authctxt *, const char *); 135 void krb4_cleanup_proc(void *); 136 137 #ifdef AFS 138 #include <kafs.h> 139 int auth_krb4_tgt(Authctxt *, const char *); 140 int auth_afs_token(Authctxt *, const char *); 141 #endif /* AFS */ 142 143 #endif /* KRB4 */ 144 145 #ifdef KRB5 146 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 147 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 148 int auth_krb5_password(Authctxt *authctxt, const char *password); 149 void krb5_cleanup_proc(Authctxt *authctxt); 150 #endif /* KRB5 */ 151 152 void do_authentication(Authctxt *); 153 void do_authentication2(Authctxt *); 154 155 void auth_log(Authctxt *, int, const char *, const char *); 156 void userauth_finish(Authctxt *, int, const char *); 157 void userauth_send_banner(const char *); 158 int auth_root_allowed(const char *); 159 160 char *auth2_read_banner(void); 161 162 void privsep_challenge_enable(void); 163 164 int auth2_challenge(Authctxt *, char *); 165 void auth2_challenge_stop(Authctxt *); 166 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 167 int bsdauth_respond(void *, u_int, char **); 168 int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 169 int skey_respond(void *, u_int, char **); 170 171 void auth2_jpake_get_pwdata(Authctxt *, BIGNUM **, char **, char **); 172 void auth2_jpake_stop(Authctxt *); 173 174 int allowed_user(struct passwd *); 175 struct passwd * getpwnamallow(const char *user); 176 177 char *get_challenge(Authctxt *); 178 int verify_response(Authctxt *, const char *); 179 180 char *expand_authorized_keys(const char *, struct passwd *pw); 181 char *authorized_principals_file(struct passwd *); 182 183 FILE *auth_openkeyfile(const char *, struct passwd *, int); 184 FILE *auth_openprincipals(const char *, struct passwd *, int); 185 int auth_key_is_revoked(Key *); 186 187 HostStatus 188 check_key_in_hostfiles(struct passwd *, Key *, const char *, 189 const char *, const char *); 190 191 /* hostkey handling */ 192 Key *get_hostkey_by_index(int); 193 Key *get_hostkey_public_by_type(int); 194 Key *get_hostkey_private_by_type(int); 195 int get_hostkey_index(Key *); 196 int ssh1_session_key(BIGNUM *); 197 198 /* debug messages during authentication */ 199 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 200 void auth_debug_send(void); 201 void auth_debug_reset(void); 202 203 struct passwd *fakepw(void); 204 205 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 206 207 #define SKEY_PROMPT "\nS/Key Password: " 208 209 #if defined(KRB5) && !defined(HEIMDAL) 210 #include <krb5.h> 211 krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); 212 #endif 213 #endif 214