1 /* $OpenBSD: auth.h,v 1.46 2003/08/28 12:54:34 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 char *user; /* username sent by the client */ 57 char *service; 58 struct passwd *pw; /* set if 'valid' */ 59 char *style; 60 void *kbdintctxt; 61 #ifdef BSD_AUTH 62 auth_session_t *as; 63 #endif 64 #ifdef KRB5 65 krb5_context krb5_ctx; 66 krb5_ccache krb5_fwd_ccache; 67 krb5_principal krb5_user; 68 char *krb5_ticket_file; 69 #endif 70 void *methoddata; 71 }; 72 /* 73 * Every authentication method has to handle authentication requests for 74 * non-existing users, or for users that are not allowed to login. In this 75 * case 'valid' is set to 0, but 'user' points to the username requested by 76 * the client. 77 */ 78 79 struct Authmethod { 80 char *name; 81 int (*userauth)(Authctxt *authctxt); 82 int *enabled; 83 }; 84 85 /* 86 * Keyboard interactive device: 87 * init_ctx returns: non NULL upon success 88 * query returns: 0 - success, otherwise failure 89 * respond returns: 0 - success, 1 - need further interaction, 90 * otherwise - failure 91 */ 92 struct KbdintDevice 93 { 94 const char *name; 95 void* (*init_ctx)(Authctxt*); 96 int (*query)(void *ctx, char **name, char **infotxt, 97 u_int *numprompts, char ***prompts, u_int **echo_on); 98 int (*respond)(void *ctx, u_int numresp, char **responses); 99 void (*free_ctx)(void *ctx); 100 }; 101 102 int auth_rhosts(struct passwd *, const char *); 103 int 104 auth_rhosts2(struct passwd *, const char *, const char *, const char *); 105 106 int auth_rhosts_rsa(struct passwd *, char *, Key *); 107 int auth_password(Authctxt *, const char *); 108 int auth_rsa(struct passwd *, BIGNUM *); 109 int auth_rsa_challenge_dialog(Key *); 110 BIGNUM *auth_rsa_generate_challenge(Key *); 111 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 112 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 113 114 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 115 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 116 int user_key_allowed(struct passwd *, Key *); 117 118 #ifdef KRB5 119 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 120 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 121 int auth_krb5_password(Authctxt *authctxt, const char *password); 122 void krb5_cleanup_proc(void *authctxt); 123 #endif /* KRB5 */ 124 125 #include "auth-pam.h" 126 127 Authctxt *do_authentication(void); 128 Authctxt *do_authentication2(void); 129 130 Authctxt *authctxt_new(void); 131 void auth_log(Authctxt *, int, char *, char *); 132 void userauth_finish(Authctxt *, int, char *); 133 int auth_root_allowed(char *); 134 135 char *auth2_read_banner(void); 136 137 void privsep_challenge_enable(void); 138 139 int auth2_challenge(Authctxt *, char *); 140 void auth2_challenge_stop(Authctxt *); 141 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 142 int bsdauth_respond(void *, u_int, char **); 143 int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 144 int skey_respond(void *, u_int, char **); 145 146 int allowed_user(struct passwd *); 147 struct passwd * getpwnamallow(const char *user); 148 149 char *get_challenge(Authctxt *); 150 int verify_response(Authctxt *, const char *); 151 void abandon_challenge_response(Authctxt *); 152 153 struct passwd * auth_get_user(void); 154 155 char *expand_filename(const char *, struct passwd *); 156 char *authorized_keys_file(struct passwd *); 157 char *authorized_keys_file2(struct passwd *); 158 159 int 160 secure_filename(FILE *, const char *, struct passwd *, char *, size_t); 161 162 HostStatus 163 check_key_in_hostfiles(struct passwd *, Key *, const char *, 164 const char *, const char *); 165 166 /* hostkey handling */ 167 Key *get_hostkey_by_index(int); 168 Key *get_hostkey_by_type(int); 169 int get_hostkey_index(Key *); 170 int ssh1_session_key(BIGNUM *); 171 172 /* debug messages during authentication */ 173 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 174 void auth_debug_send(void); 175 void auth_debug_reset(void); 176 177 struct passwd *fakepw(void); 178 179 #define AUTH_FAIL_MAX 6 180 #define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2) 181 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 182 183 #ifdef SKEY 184 #ifdef OPIE 185 #define SKEY_PROMPT "\nOPIE Password: " 186 #else 187 #define SKEY_PROMPT "\nS/Key Password: " 188 #endif 189 #endif 190 191 #endif 192