1 /* $OpenBSD: auth.h,v 1.49 2004/01/30 09:48:57 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; /* authentication needs another step */ 53 int valid; /* user exists and is allowed to login */ 54 int attempt; 55 int failures; 56 int force_pwchange; 57 char *user; /* username sent by the client */ 58 char *service; 59 struct passwd *pw; /* set if 'valid' */ 60 char *style; 61 void *kbdintctxt; 62 #ifdef BSD_AUTH 63 auth_session_t *as; 64 #endif 65 #ifdef KRB5 66 krb5_context krb5_ctx; 67 krb5_ccache krb5_fwd_ccache; 68 krb5_principal krb5_user; 69 char *krb5_ticket_file; 70 #endif 71 void *methoddata; 72 }; 73 /* 74 * Every authentication method has to handle authentication requests for 75 * non-existing users, or for users that are not allowed to login. In this 76 * case 'valid' is set to 0, but 'user' points to the username requested by 77 * the client. 78 */ 79 80 struct Authmethod { 81 char *name; 82 int (*userauth)(Authctxt *authctxt); 83 int *enabled; 84 }; 85 86 /* 87 * Keyboard interactive device: 88 * init_ctx returns: non NULL upon success 89 * query returns: 0 - success, otherwise failure 90 * respond returns: 0 - success, 1 - need further interaction, 91 * otherwise - failure 92 */ 93 struct KbdintDevice 94 { 95 const char *name; 96 void* (*init_ctx)(Authctxt*); 97 int (*query)(void *ctx, char **name, char **infotxt, 98 u_int *numprompts, char ***prompts, u_int **echo_on); 99 int (*respond)(void *ctx, u_int numresp, char **responses); 100 void (*free_ctx)(void *ctx); 101 }; 102 103 int auth_rhosts(struct passwd *, const char *); 104 int 105 auth_rhosts2(struct passwd *, const char *, const char *, const char *); 106 107 int auth_rhosts_rsa(Authctxt *, char *, Key *); 108 int auth_password(Authctxt *, const char *); 109 int auth_rsa(Authctxt *, BIGNUM *); 110 int auth_rsa_challenge_dialog(Key *); 111 BIGNUM *auth_rsa_generate_challenge(Key *); 112 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 113 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 114 115 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 116 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 117 int user_key_allowed(struct passwd *, Key *); 118 119 #ifdef KRB5 120 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 121 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 122 int auth_krb5_password(Authctxt *authctxt, const char *password); 123 void krb5_cleanup_proc(Authctxt *authctxt); 124 #endif /* KRB5 */ 125 126 #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) 127 #include <shadow.h> 128 int auth_shadow_acctexpired(struct spwd *); 129 int auth_shadow_pwexpired(Authctxt *); 130 #endif 131 132 #include "auth-pam.h" 133 void disable_forwarding(void); 134 135 void do_authentication(Authctxt *); 136 void do_authentication2(Authctxt *); 137 138 void auth_log(Authctxt *, int, char *, char *); 139 void userauth_finish(Authctxt *, int, char *); 140 int auth_root_allowed(char *); 141 142 char *auth2_read_banner(void); 143 144 void privsep_challenge_enable(void); 145 146 int auth2_challenge(Authctxt *, char *); 147 void auth2_challenge_stop(Authctxt *); 148 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 149 int bsdauth_respond(void *, u_int, char **); 150 int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 151 int skey_respond(void *, u_int, char **); 152 153 int allowed_user(struct passwd *); 154 struct passwd * getpwnamallow(const char *user); 155 156 char *get_challenge(Authctxt *); 157 int verify_response(Authctxt *, const char *); 158 void abandon_challenge_response(Authctxt *); 159 160 char *expand_filename(const char *, struct passwd *); 161 char *authorized_keys_file(struct passwd *); 162 char *authorized_keys_file2(struct passwd *); 163 164 int 165 secure_filename(FILE *, const char *, struct passwd *, char *, size_t); 166 167 HostStatus 168 check_key_in_hostfiles(struct passwd *, Key *, const char *, 169 const char *, const char *); 170 171 /* hostkey handling */ 172 Key *get_hostkey_by_index(int); 173 Key *get_hostkey_by_type(int); 174 int get_hostkey_index(Key *); 175 int ssh1_session_key(BIGNUM *); 176 177 /* debug messages during authentication */ 178 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 179 void auth_debug_send(void); 180 void auth_debug_reset(void); 181 182 struct passwd *fakepw(void); 183 184 #define AUTH_FAIL_MAX 6 185 #define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2) 186 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 187 188 #ifdef SKEY 189 #ifdef OPIE 190 #define SKEY_PROMPT "\nOPIE Password: " 191 #else 192 #define SKEY_PROMPT "\nS/Key Password: " 193 #endif 194 #endif 195 196 #endif 197