1 /* $NetBSD: auth.h,v 1.7 2013/11/08 19:18:24 christos Exp $ */ 2 /* $OpenBSD: auth.h,v 1.76 2013/07/19 07:37:48 markus 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 char *info; /* Extra info for next auth_log */ 65 void *jpake_ctx; 66 #ifdef BSD_AUTH 67 auth_session_t *as; 68 #endif 69 #ifdef KRB4 70 char *krb4_ticket_file; 71 #endif 72 char **auth_methods; /* modified from server config */ 73 u_int num_auth_methods; 74 #ifdef KRB5 75 krb5_context krb5_ctx; 76 krb5_auth_context krb5_auth_ctx; 77 krb5_ccache krb5_fwd_ccache; 78 krb5_principal krb5_user; 79 char *krb5_ticket_file; 80 #endif 81 void *methoddata; 82 }; 83 /* 84 * Every authentication method has to handle authentication requests for 85 * non-existing users, or for users that are not allowed to login. In this 86 * case 'valid' is set to 0, but 'user' points to the username requested by 87 * the client. 88 */ 89 90 #ifdef USE_PAM 91 #include "auth-pam.h" 92 #endif 93 94 struct Authmethod { 95 const char *name; 96 int (*userauth)(Authctxt *authctxt); 97 int *enabled; 98 }; 99 100 /* 101 * Keyboard interactive device: 102 * init_ctx returns: non NULL upon success 103 * query returns: 0 - success, otherwise failure 104 * respond returns: 0 - success, 1 - need further interaction, 105 * otherwise - failure 106 */ 107 struct KbdintDevice 108 { 109 const char *name; 110 void* (*init_ctx)(Authctxt*); 111 int (*query)(void *ctx, char **name, char **infotxt, 112 u_int *numprompts, char ***prompts, u_int **echo_on); 113 int (*respond)(void *ctx, u_int numresp, char **responses); 114 void (*free_ctx)(void *ctx); 115 }; 116 117 void disable_forwarding(void); 118 int auth_rhosts(struct passwd *, const char *); 119 int 120 auth_rhosts2(struct passwd *, const char *, const char *, const char *); 121 122 int auth_rhosts_rsa(Authctxt *, char *, Key *); 123 int auth_password(Authctxt *, const char *); 124 int auth_rsa(Authctxt *, BIGNUM *); 125 int auth_rsa_challenge_dialog(Key *); 126 BIGNUM *auth_rsa_generate_challenge(Key *); 127 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 128 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 129 130 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 131 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 132 int user_key_allowed(struct passwd *, Key *); 133 void pubkey_auth_info(Authctxt *, const Key *, const char *, ...) 134 __attribute__((__format__ (printf, 3, 4))); 135 136 #ifdef KRB4 137 #include <krb.h> 138 int auth_krb4(Authctxt *, KTEXT, char **, KTEXT); 139 int auth_krb4_password(Authctxt *, const char *); 140 void krb4_cleanup_proc(void *); 141 142 #ifdef AFS 143 #include <kafs.h> 144 int auth_krb4_tgt(Authctxt *, const char *); 145 int auth_afs_token(Authctxt *, const char *); 146 #endif /* AFS */ 147 148 #endif /* KRB4 */ 149 150 struct stat; 151 int auth_secure_path(const char *, struct stat *, const char *, uid_t, 152 char *, size_t); 153 154 #ifdef KRB5 155 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 156 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 157 int auth_krb5_password(Authctxt *authctxt, const char *password); 158 void krb5_cleanup_proc(Authctxt *authctxt); 159 #endif /* KRB5 */ 160 161 void do_authentication(Authctxt *); 162 void do_authentication2(Authctxt *); 163 164 void auth_info(Authctxt *authctxt, const char *, ...) 165 __attribute__((__format__ (printf, 2, 3))) 166 __attribute__((__nonnull__ (2))); 167 void auth_log(Authctxt *, int, int, const char *, const char *); 168 void userauth_finish(Authctxt *, int, const char *, const char *); 169 int auth_root_allowed(const char *); 170 171 char *auth2_read_banner(void); 172 int auth2_methods_valid(const char *, int); 173 int auth2_update_methods_lists(Authctxt *, const char *, const char *); 174 int auth2_setup_methods_lists(Authctxt *); 175 int auth2_method_allowed(Authctxt *, const char *, const char *); 176 177 void privsep_challenge_enable(void); 178 179 int auth2_challenge(Authctxt *, char *); 180 void auth2_challenge_stop(Authctxt *); 181 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 182 int bsdauth_respond(void *, u_int, char **); 183 int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 184 int skey_respond(void *, u_int, char **); 185 186 void auth2_jpake_get_pwdata(Authctxt *, BIGNUM **, char **, char **); 187 void auth2_jpake_stop(Authctxt *); 188 189 int allowed_user(struct passwd *); 190 struct passwd * getpwnamallow(const char *user); 191 192 char *get_challenge(Authctxt *); 193 int verify_response(Authctxt *, const char *); 194 195 char *expand_authorized_keys(const char *, struct passwd *pw); 196 char *authorized_principals_file(struct passwd *); 197 198 FILE *auth_openkeyfile(const char *, struct passwd *, int); 199 FILE *auth_openprincipals(const char *, struct passwd *, int); 200 int auth_key_is_revoked(Key *); 201 202 HostStatus 203 check_key_in_hostfiles(struct passwd *, Key *, const char *, 204 const char *, const char *); 205 206 /* hostkey handling */ 207 Key *get_hostkey_by_index(int); 208 Key *get_hostkey_public_by_index(int); 209 Key *get_hostkey_public_by_type(int); 210 Key *get_hostkey_private_by_type(int); 211 int get_hostkey_index(Key *); 212 int ssh1_session_key(BIGNUM *); 213 void sshd_hostkey_sign(Key *, Key *, u_char **, u_int *, u_char *, u_int); 214 215 /* debug messages during authentication */ 216 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 217 void auth_debug_send(void); 218 void auth_debug_reset(void); 219 220 struct passwd *fakepw(void); 221 222 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 223 224 #define SKEY_PROMPT "\nS/Key Password: " 225 226 #if defined(KRB5) && !defined(HEIMDAL) 227 #include <krb5.h> 228 krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); 229 #endif 230 #endif 231