1 /* $OpenBSD: auth.h,v 1.41 2002/09/26 11:38:43 markus Exp $ */ 2 /* $FreeBSD$ */ 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 "key.h" 33 #include "hostfile.h" 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 int success; 52 int postponed; 53 int valid; 54 int attempt; 55 int failures; 56 char *user; 57 char *service; 58 struct passwd *pw; 59 char *style; 60 void *kbdintctxt; 61 #ifdef BSD_AUTH 62 auth_session_t *as; 63 #endif 64 #ifdef KRB4 65 char *krb4_ticket_file; 66 #endif 67 #ifdef KRB5 68 krb5_context krb5_ctx; 69 krb5_auth_context krb5_auth_ctx; 70 krb5_ccache krb5_fwd_ccache; 71 krb5_principal krb5_user; 72 char *krb5_ticket_file; 73 #endif 74 }; 75 76 struct Authmethod { 77 char *name; 78 int (*userauth)(Authctxt *authctxt); 79 int *enabled; 80 }; 81 82 /* 83 * Keyboard interactive device: 84 * init_ctx returns: non NULL upon success 85 * query returns: 0 - success, otherwise failure 86 * respond returns: 0 - success, 1 - need further interaction, 87 * otherwise - failure 88 */ 89 struct KbdintDevice 90 { 91 const char *name; 92 void* (*init_ctx)(Authctxt*); 93 int (*query)(void *ctx, char **name, char **infotxt, 94 u_int *numprompts, char ***prompts, u_int **echo_on); 95 int (*respond)(void *ctx, u_int numresp, char **responses); 96 void (*free_ctx)(void *ctx); 97 }; 98 99 int auth_rhosts(struct passwd *, const char *); 100 int 101 auth_rhosts2(struct passwd *, const char *, const char *, const char *); 102 103 int auth_rhosts_rsa(struct passwd *, char *, Key *); 104 int auth_password(Authctxt *, const char *); 105 int auth_rsa(struct passwd *, BIGNUM *); 106 int auth_rsa_challenge_dialog(Key *); 107 BIGNUM *auth_rsa_generate_challenge(Key *); 108 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 109 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 110 111 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 112 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 113 int user_key_allowed(struct passwd *, Key *); 114 115 #ifdef KRB4 116 #include <krb.h> 117 int auth_krb4(Authctxt *, KTEXT, char **, KTEXT); 118 int auth_krb4_password(Authctxt *, const char *); 119 void krb4_cleanup_proc(void *); 120 121 #ifdef AFS 122 #include <kafs.h> 123 int auth_krb4_tgt(Authctxt *, const char *); 124 int auth_afs_token(Authctxt *, const char *); 125 #endif /* AFS */ 126 127 #endif /* KRB4 */ 128 129 #ifdef KRB5 130 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 131 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 132 int auth_krb5_password(Authctxt *authctxt, const char *password); 133 void krb5_cleanup_proc(void *authctxt); 134 #endif /* KRB5 */ 135 136 #include "auth-pam.h" 137 #include "auth2-pam.h" 138 139 Authctxt *do_authentication(void); 140 Authctxt *do_authentication2(void); 141 142 Authctxt *authctxt_new(void); 143 void auth_log(Authctxt *, int, char *, char *); 144 void userauth_finish(Authctxt *, int, char *); 145 int auth_root_allowed(char *); 146 147 char *auth2_read_banner(void); 148 149 void privsep_challenge_enable(void); 150 151 int auth2_challenge(Authctxt *, char *); 152 void auth2_challenge_stop(Authctxt *); 153 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 154 int bsdauth_respond(void *, u_int, char **); 155 int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 156 int skey_respond(void *, u_int, char **); 157 158 int allowed_user(struct passwd *); 159 struct passwd * getpwnamallow(const char *user); 160 161 char *get_challenge(Authctxt *); 162 int verify_response(Authctxt *, const char *); 163 void abandon_challenge_response(Authctxt *); 164 165 struct passwd * auth_get_user(void); 166 167 char *expand_filename(const char *, struct passwd *); 168 char *authorized_keys_file(struct passwd *); 169 char *authorized_keys_file2(struct passwd *); 170 171 int 172 secure_filename(FILE *, const char *, struct passwd *, char *, size_t); 173 174 HostStatus 175 check_key_in_hostfiles(struct passwd *, Key *, const char *, 176 const char *, const char *); 177 178 /* hostkey handling */ 179 Key *get_hostkey_by_index(int); 180 Key *get_hostkey_by_type(int); 181 int get_hostkey_index(Key *); 182 int ssh1_session_key(BIGNUM *); 183 184 /* debug messages during authentication */ 185 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 186 void auth_debug_send(void); 187 void auth_debug_reset(void); 188 189 #define AUTH_FAIL_MAX 6 190 #define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2) 191 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 192 193 #ifdef SKEY 194 #ifdef OPIE 195 #define SKEY_PROMPT "\nOPIE Password: " 196 #else 197 #define SKEY_PROMPT "\nS/Key Password: " 198 #endif 199 #endif 200 201 #endif 202