Greg Hartman | a2eb7b5 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 1 | /* $OpenBSD: auth.h,v 1.84 2015/05/08 06:41:56 djm Exp $ */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 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 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 45 | struct ssh; |
| 46 | struct sshkey; |
| 47 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 48 | typedef struct Authctxt Authctxt; |
| 49 | typedef struct Authmethod Authmethod; |
| 50 | typedef struct KbdintDevice KbdintDevice; |
| 51 | |
| 52 | struct Authctxt { |
| 53 | sig_atomic_t success; |
| 54 | int authenticated; /* authenticated and alarms cancelled */ |
| 55 | int postponed; /* authentication needs another step */ |
| 56 | int valid; /* user exists and is allowed to login */ |
| 57 | int attempt; |
| 58 | int failures; |
Greg Hartman | a2eb7b5 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 59 | int server_caused_failure; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 60 | int force_pwchange; |
| 61 | char *user; /* username sent by the client */ |
| 62 | char *service; |
| 63 | struct passwd *pw; /* set if 'valid' */ |
| 64 | char *style; |
| 65 | void *kbdintctxt; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 66 | char *info; /* Extra info for next auth_log */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 67 | #ifdef BSD_AUTH |
| 68 | auth_session_t *as; |
| 69 | #endif |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 70 | char **auth_methods; /* modified from server config */ |
| 71 | u_int num_auth_methods; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 72 | #ifdef KRB5 |
| 73 | krb5_context krb5_ctx; |
| 74 | krb5_ccache krb5_fwd_ccache; |
| 75 | krb5_principal krb5_user; |
| 76 | char *krb5_ticket_file; |
| 77 | char *krb5_ccname; |
| 78 | #endif |
| 79 | Buffer *loginmsg; |
| 80 | void *methoddata; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 81 | |
| 82 | struct sshkey **prev_userkeys; |
| 83 | u_int nprev_userkeys; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 84 | }; |
| 85 | /* |
| 86 | * Every authentication method has to handle authentication requests for |
| 87 | * non-existing users, or for users that are not allowed to login. In this |
| 88 | * case 'valid' is set to 0, but 'user' points to the username requested by |
| 89 | * the client. |
| 90 | */ |
| 91 | |
| 92 | struct Authmethod { |
| 93 | char *name; |
| 94 | int (*userauth)(Authctxt *authctxt); |
| 95 | int *enabled; |
| 96 | }; |
| 97 | |
| 98 | /* |
| 99 | * Keyboard interactive device: |
| 100 | * init_ctx returns: non NULL upon success |
| 101 | * query returns: 0 - success, otherwise failure |
| 102 | * respond returns: 0 - success, 1 - need further interaction, |
| 103 | * otherwise - failure |
| 104 | */ |
| 105 | struct KbdintDevice |
| 106 | { |
| 107 | const char *name; |
| 108 | void* (*init_ctx)(Authctxt*); |
| 109 | int (*query)(void *ctx, char **name, char **infotxt, |
| 110 | u_int *numprompts, char ***prompts, u_int **echo_on); |
| 111 | int (*respond)(void *ctx, u_int numresp, char **responses); |
| 112 | void (*free_ctx)(void *ctx); |
| 113 | }; |
| 114 | |
| 115 | int auth_rhosts(struct passwd *, const char *); |
| 116 | int |
| 117 | auth_rhosts2(struct passwd *, const char *, const char *, const char *); |
| 118 | |
| 119 | int auth_rhosts_rsa(Authctxt *, char *, Key *); |
| 120 | int auth_password(Authctxt *, const char *); |
| 121 | int auth_rsa(Authctxt *, BIGNUM *); |
| 122 | int auth_rsa_challenge_dialog(Key *); |
| 123 | BIGNUM *auth_rsa_generate_challenge(Key *); |
| 124 | int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); |
| 125 | int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); |
| 126 | |
| 127 | int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); |
| 128 | int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); |
Greg Hartman | a2eb7b5 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 129 | int user_key_allowed(struct passwd *, Key *, int); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 130 | void pubkey_auth_info(Authctxt *, const Key *, const char *, ...) |
| 131 | __attribute__((__format__ (printf, 3, 4))); |
| 132 | void auth2_record_userkey(Authctxt *, struct sshkey *); |
| 133 | int auth2_userkey_already_used(Authctxt *, struct sshkey *); |
| 134 | |
| 135 | struct stat; |
| 136 | int auth_secure_path(const char *, struct stat *, const char *, uid_t, |
| 137 | char *, size_t); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 138 | |
| 139 | #ifdef KRB5 |
| 140 | int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); |
| 141 | int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); |
| 142 | int auth_krb5_password(Authctxt *authctxt, const char *password); |
| 143 | void krb5_cleanup_proc(Authctxt *authctxt); |
| 144 | #endif /* KRB5 */ |
| 145 | |
| 146 | #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) |
| 147 | #include <shadow.h> |
| 148 | int auth_shadow_acctexpired(struct spwd *); |
| 149 | int auth_shadow_pwexpired(Authctxt *); |
| 150 | #endif |
| 151 | |
| 152 | #include "auth-pam.h" |
| 153 | #include "audit.h" |
| 154 | void remove_kbdint_device(const char *); |
| 155 | |
| 156 | void disable_forwarding(void); |
| 157 | |
| 158 | void do_authentication(Authctxt *); |
| 159 | void do_authentication2(Authctxt *); |
| 160 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 161 | void auth_info(Authctxt *authctxt, const char *, ...) |
| 162 | __attribute__((__format__ (printf, 2, 3))) |
| 163 | __attribute__((__nonnull__ (2))); |
| 164 | void auth_log(Authctxt *, int, int, const char *, const char *); |
| 165 | void auth_maxtries_exceeded(Authctxt *) __attribute__((noreturn)); |
| 166 | void userauth_finish(Authctxt *, int, const char *, const char *); |
| 167 | int auth_root_allowed(const char *); |
| 168 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 169 | void userauth_send_banner(const char *); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 170 | |
| 171 | char *auth2_read_banner(void); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 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 *); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 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 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 186 | int allowed_user(struct passwd *); |
| 187 | struct passwd * getpwnamallow(const char *user); |
| 188 | |
| 189 | char *get_challenge(Authctxt *); |
| 190 | int verify_response(Authctxt *, const char *); |
| 191 | void abandon_challenge_response(Authctxt *); |
| 192 | |
| 193 | char *expand_authorized_keys(const char *, struct passwd *pw); |
| 194 | char *authorized_principals_file(struct passwd *); |
| 195 | |
| 196 | FILE *auth_openkeyfile(const char *, struct passwd *, int); |
| 197 | FILE *auth_openprincipals(const char *, struct passwd *, int); |
| 198 | int auth_key_is_revoked(Key *); |
| 199 | |
| 200 | HostStatus |
| 201 | check_key_in_hostfiles(struct passwd *, Key *, const char *, |
| 202 | const char *, const char *); |
| 203 | |
| 204 | /* hostkey handling */ |
| 205 | Key *get_hostkey_by_index(int); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 206 | Key *get_hostkey_public_by_index(int, struct ssh *); |
| 207 | Key *get_hostkey_public_by_type(int, int, struct ssh *); |
| 208 | Key *get_hostkey_private_by_type(int, int, struct ssh *); |
| 209 | int get_hostkey_index(Key *, int, struct ssh *); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 210 | int ssh1_session_key(BIGNUM *); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 211 | int sshd_hostkey_sign(Key *, Key *, u_char **, size_t *, |
| 212 | const u_char *, size_t, u_int); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 213 | |
| 214 | /* debug messages during authentication */ |
| 215 | void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
| 216 | void auth_debug_send(void); |
| 217 | void auth_debug_reset(void); |
| 218 | |
| 219 | struct passwd *fakepw(void); |
| 220 | |
| 221 | int sys_auth_passwd(Authctxt *, const char *); |
| 222 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 223 | #define SKEY_PROMPT "\nS/Key Password: " |
| 224 | |
| 225 | #if defined(KRB5) && !defined(HEIMDAL) |
| 226 | #include <krb5.h> |
| 227 | krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); |
| 228 | #endif |
| 229 | #endif |