1 /* $OpenBSD: auth.h,v 1.66 2010/05/07 11:30:29 djm Exp $ */ 2 3 /* 4 * Copyright (c) 2000 Markus Friedl. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28 #ifndef AUTH_H 29 #define AUTH_H 30 31 #include <signal.h> 32 33 #include <openssl/rsa.h> 34 35 #ifdef HAVE_LOGIN_CAP 36 #include <login_cap.h> 37 #endif 38 #ifdef BSD_AUTH 39 #include <bsd_auth.h> 40 #endif 41 #ifdef KRB5 42 #include <krb5.h> 43 #endif 44 45 typedef struct Authctxt Authctxt; 46 typedef struct Authmethod Authmethod; 47 typedef struct KbdintDevice KbdintDevice; 48 49 struct Authctxt { 50 sig_atomic_t success; 51 int authenticated; /* authenticated and alarms cancelled */ 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 void *jpake_ctx; 63 #ifdef BSD_AUTH 64 auth_session_t *as; 65 #endif 66 #ifdef KRB5 67 krb5_context krb5_ctx; 68 krb5_ccache krb5_fwd_ccache; 69 krb5_principal krb5_user; 70 char *krb5_ticket_file; 71 char *krb5_ccname; 72 #endif 73 Buffer *loginmsg; 74 void *methoddata; 75 }; 76 /* 77 * Every authentication method has to handle authentication requests for 78 * non-existing users, or for users that are not allowed to login. In this 79 * case 'valid' is set to 0, but 'user' points to the username requested by 80 * the client. 81 */ 82 83 struct Authmethod { 84 char *name; 85 int (*userauth)(Authctxt *authctxt); 86 int *enabled; 87 }; 88 89 /* 90 * Keyboard interactive device: 91 * init_ctx returns: non NULL upon success 92 * query returns: 0 - success, otherwise failure 93 * respond returns: 0 - success, 1 - need further interaction, 94 * otherwise - failure 95 */ 96 struct KbdintDevice 97 { 98 const char *name; 99 void* (*init_ctx)(Authctxt*); 100 int (*query)(void *ctx, char **name, char **infotxt, 101 u_int *numprompts, char ***prompts, u_int **echo_on); 102 int (*respond)(void *ctx, u_int numresp, char **responses); 103 void (*free_ctx)(void *ctx); 104 }; 105 106 int auth_rhosts(struct passwd *, const char *); 107 int 108 auth_rhosts2(struct passwd *, const char *, const char *, const char *); 109 110 int auth_rhosts_rsa(Authctxt *, char *, Key *); 111 int auth_password(Authctxt *, const char *); 112 int auth_rsa(Authctxt *, BIGNUM *); 113 int auth_rsa_challenge_dialog(Key *); 114 BIGNUM *auth_rsa_generate_challenge(Key *); 115 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 116 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 117 118 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 119 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 120 int user_key_allowed(struct passwd *, Key *); 121 122 #ifdef KRB5 123 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 124 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 125 int auth_krb5_password(Authctxt *authctxt, const char *password); 126 void krb5_cleanup_proc(Authctxt *authctxt); 127 #endif /* KRB5 */ 128 129 #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) 130 #include <shadow.h> 131 int auth_shadow_acctexpired(struct spwd *); 132 int auth_shadow_pwexpired(Authctxt *); 133 #endif 134 135 #include "auth-pam.h" 136 #include "audit.h" 137 void remove_kbdint_device(const char *); 138 139 void disable_forwarding(void); 140 141 void do_authentication(Authctxt *); 142 void do_authentication2(Authctxt *); 143 144 void auth_log(Authctxt *, int, char *, char *); 145 void userauth_finish(Authctxt *, int, char *); 146 void userauth_send_banner(const char *); 147 int auth_root_allowed(char *); 148 149 char *auth2_read_banner(void); 150 151 void privsep_challenge_enable(void); 152 153 int auth2_challenge(Authctxt *, char *); 154 void auth2_challenge_stop(Authctxt *); 155 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 156 int bsdauth_respond(void *, u_int, char **); 157 int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 158 int skey_respond(void *, u_int, char **); 159 160 void auth2_jpake_get_pwdata(Authctxt *, BIGNUM **, char **, char **); 161 void auth2_jpake_stop(Authctxt *); 162 163 int allowed_user(struct passwd *); 164 struct passwd * getpwnamallow(const char *user); 165 166 char *get_challenge(Authctxt *); 167 int verify_response(Authctxt *, const char *); 168 void abandon_challenge_response(Authctxt *); 169 170 char *authorized_keys_file(struct passwd *); 171 char *authorized_keys_file2(struct passwd *); 172 char *authorized_principals_file(struct passwd *); 173 174 FILE *auth_openkeyfile(const char *, struct passwd *, int); 175 FILE *auth_openprincipals(const char *, struct passwd *, int); 176 int auth_key_is_revoked(Key *); 177 178 HostStatus 179 check_key_in_hostfiles(struct passwd *, Key *, const char *, 180 const char *, const char *); 181 182 /* hostkey handling */ 183 Key *get_hostkey_by_index(int); 184 Key *get_hostkey_public_by_type(int); 185 Key *get_hostkey_private_by_type(int); 186 int get_hostkey_index(Key *); 187 int ssh1_session_key(BIGNUM *); 188 189 /* debug messages during authentication */ 190 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 191 void auth_debug_send(void); 192 void auth_debug_reset(void); 193 194 struct passwd *fakepw(void); 195 196 int sys_auth_passwd(Authctxt *, const char *); 197 198 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 199 200 #define SKEY_PROMPT "\nS/Key Password: " 201 202 #if defined(KRB5) && !defined(HEIMDAL) 203 #include <krb5.h> 204 krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); 205 #endif 206 #endif 207