release/src/router/dropbear/auth.h

   1 /*
   2  * Dropbear - a SSH2 server
   3  *
   4  * Copyright (c) 2002,2003 Matt Johnston
   5  * All rights reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE. */
  24
  25 #ifndef _AUTH_H_
  26 #define _AUTH_H_
  27
  28 #include "includes.h"
  29 #include "signkey.h"
  30 #include "chansession.h"
  31
  32 void svr_authinitialise();
  33 void cli_authinitialise();
  34
  35 /* Server functions */
  36 void recv_msg_userauth_request();
  37 void send_msg_userauth_failure(int partial, int incrfail);
  38 void send_msg_userauth_success();
  39 void svr_auth_password();
  40 void svr_auth_pubkey();
  41 void svr_auth_pam();
  42
  43 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
  44 int svr_pubkey_allows_agentfwd();
  45 int svr_pubkey_allows_tcpfwd();
  46 int svr_pubkey_allows_x11fwd();
  47 int svr_pubkey_allows_pty();
  48 void svr_pubkey_set_forced_command(struct ChanSess *chansess);
  49 void svr_pubkey_options_cleanup();
  50 int svr_add_pubkey_options(buffer *options_buf, int line_num, const char* filename);
  51 #else
  52 /* no option : success */
  53 #define svr_pubkey_allows_agentfwd() 1
  54 #define svr_pubkey_allows_tcpfwd() 1
  55 #define svr_pubkey_allows_x11fwd() 1
  56 #define svr_pubkey_allows_pty() 1
  57 static inline void svr_pubkey_set_forced_command(struct ChanSess *chansess) { }
  58 static inline void svr_pubkey_options_cleanup() { }
  59 #define svr_add_pubkey_options(x,y,z) DROPBEAR_SUCCESS
  60 #endif
  61
  62 /* Client functions */
  63 void recv_msg_userauth_failure();
  64 void recv_msg_userauth_success();
  65 void recv_msg_userauth_specific_60();
  66 void recv_msg_userauth_pk_ok();
  67 void recv_msg_userauth_info_request();
  68 void cli_get_user();
  69 void cli_auth_getmethods();
  70 void cli_auth_try();
  71 void recv_msg_userauth_banner();
  72 void cli_pubkeyfail();
  73 void cli_auth_password();
  74 int cli_auth_pubkey();
  75 void cli_auth_interactive();
  76 char* getpass_or_cancel(char* prompt);
  77 void cli_auth_pubkey_cleanup();
  78
  79
  80 #define MAX_USERNAME_LEN 25 /* arbitrary for the moment */
  81
  82 #define AUTH_TYPE_NONE      1
  83 #define AUTH_TYPE_PUBKEY    1 << 1
  84 #define AUTH_TYPE_PASSWORD  1 << 2
  85 #define AUTH_TYPE_INTERACT  1 << 3
  86
  87 #define AUTH_METHOD_NONE "none"
  88 #define AUTH_METHOD_NONE_LEN 4
  89 #define AUTH_METHOD_PUBKEY "publickey"
  90 #define AUTH_METHOD_PUBKEY_LEN 9
  91 #define AUTH_METHOD_PASSWORD "password"
  92 #define AUTH_METHOD_PASSWORD_LEN 8
  93 #define AUTH_METHOD_INTERACT "keyboard-interactive"
  94 #define AUTH_METHOD_INTERACT_LEN 20
  95
  96
  97
  98 /* This structure is shared between server and client - it contains
  99  * relatively little extraneous bits when used for the client rather than the
 100  * server */
 101 struct AuthState {
 102         char *username; /* This is the username the client presents to check. It
 103                                            is updated each run through, used for auth checking */
 104         unsigned char authtypes; /* Flags indicating which auth types are still
 105                                                                 valid */
 106         unsigned int failcount; /* Number of (failed) authentication attempts.*/
 107         unsigned authdone : 1; /* 0 if we haven't authed, 1 if we have. Applies for
 108                                                           client and server (though has differing [obvious]
 109                                                           meanings). */
 110         unsigned perm_warn : 1; /* Server only, set if bad permissions on
 111                                                            ~/.ssh/authorized_keys have already been
 112                                                            logged. */
 113
 114         /* These are only used for the server */
 115         uid_t pw_uid;
 116         gid_t pw_gid;
 117         char *pw_dir;
 118         char *pw_shell;
 119         char *pw_name;
 120         char *pw_passwd;
 121 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
 122         struct PubKeyOptions* pubkey_options;
 123 #endif
 124 };
 125
 126 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
 127 struct PubKeyOptions;
 128 struct PubKeyOptions {
 129         /* Flags */
 130         int no_port_forwarding_flag;
 131         int no_agent_forwarding_flag;
 132         int no_x11_forwarding_flag;
 133         int no_pty_flag;
 134         /* "command=" option. */
 135         unsigned char * forced_command;
 136 };
 137 #endif
 138
 139 #endif /* _AUTH_H_ */