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 "chansession.h"
  30
  31 void svr_authinitialise();
  32 void cli_authinitialise();
  33
  34 /* Server functions */
  35 void recv_msg_userauth_request();
  36 void send_msg_userauth_failure(int partial, int incrfail);
  37 void send_msg_userauth_success();
  38 void svr_auth_password();
  39 void svr_auth_pubkey();
  40 void svr_auth_pam();
  41
  42 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
  43 int svr_pubkey_allows_agentfwd();
  44 int svr_pubkey_allows_tcpfwd();
  45 int svr_pubkey_allows_x11fwd();
  46 int svr_pubkey_allows_pty();
  47 void svr_pubkey_set_forced_command(struct ChanSess *chansess);
  48 void svr_pubkey_options_cleanup();
  49 int svr_add_pubkey_options(buffer *options_buf, int line_num, const char* filename);
  50 #else
  51 /* no option : success */
  52 #define svr_pubkey_allows_agentfwd() 1
  53 #define svr_pubkey_allows_tcpfwd() 1
  54 #define svr_pubkey_allows_x11fwd() 1
  55 #define svr_pubkey_allows_pty() 1
  56 static inline void svr_pubkey_set_forced_command(struct ChanSess *chansess) { }
  57 static inline void svr_pubkey_options_cleanup() { }
  58 #define svr_add_pubkey_options(x,y,z) DROPBEAR_SUCCESS
  59 #endif
  60
  61 /* Client functions */
  62 void recv_msg_userauth_failure();
  63 void recv_msg_userauth_success();
  64 void recv_msg_userauth_specific_60();
  65 void recv_msg_userauth_pk_ok();
  66 void recv_msg_userauth_info_request();
  67 void cli_get_user();
  68 void cli_auth_getmethods();
  69 void cli_auth_try();
  70 void recv_msg_userauth_banner();
  71 void cli_pubkeyfail();
  72 void cli_auth_password();
  73 int cli_auth_pubkey();
  74 void cli_auth_interactive();
  75 char* getpass_or_cancel(char* prompt);
  76
  77
  78 #define MAX_USERNAME_LEN 25 /* arbitrary for the moment */
  79
  80 #define AUTH_TYPE_NONE      1
  81 #define AUTH_TYPE_PUBKEY    1 << 1
  82 #define AUTH_TYPE_PASSWORD  1 << 2
  83 #define AUTH_TYPE_INTERACT  1 << 3
  84
  85 #define AUTH_METHOD_NONE "none"
  86 #define AUTH_METHOD_NONE_LEN 4
  87 #define AUTH_METHOD_PUBKEY "publickey"
  88 #define AUTH_METHOD_PUBKEY_LEN 9
  89 #define AUTH_METHOD_PASSWORD "password"
  90 #define AUTH_METHOD_PASSWORD_LEN 8
  91 #define AUTH_METHOD_INTERACT "keyboard-interactive"
  92 #define AUTH_METHOD_INTERACT_LEN 20
  93
  94
  95
  96 /* This structure is shared between server and client - it contains
  97  * relatively little extraneous bits when used for the client rather than the
  98  * server */
  99 struct AuthState {
 100
 101         char *username; /* This is the username the client presents to check. It
 102                                            is updated each run through, used for auth checking */
 103         unsigned char authtypes; /* Flags indicating which auth types are still
 104                                                                 valid */
 105         unsigned int failcount; /* Number of (failed) authentication attempts.*/
 106         unsigned authdone : 1; /* 0 if we haven't authed, 1 if we have. Applies for
 107                                                           client and server (though has differing [obvious]
 108                                                           meanings). */
 109         unsigned perm_warn : 1; /* Server only, set if bad permissions on
 110                                                            ~/.ssh/authorized_keys have already been
 111                                                            logged. */
 112
 113         /* These are only used for the server */
 114         uid_t pw_uid;
 115         gid_t pw_gid;
 116         char *pw_dir;
 117         char *pw_shell;
 118         char *pw_name;
 119         char *pw_passwd;
 120 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
 121         struct PubKeyOptions* pubkey_options;
 122 #endif
 123
 124 };
 125
 126 struct SignKeyList;
 127 /* A singly linked list of signing keys */
 128 struct SignKeyList {
 129
 130         sign_key *key;
 131         int type; /* The type of key */
 132         struct SignKeyList *next;
 133         /* filename? or the buffer? for encrypted keys, so we can later get
 134          * the private key portion */
 135
 136 };
 137
 138 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
 139 struct PubKeyOptions;
 140 struct PubKeyOptions {
 141         /* Flags */
 142         int no_port_forwarding_flag;
 143         int no_agent_forwarding_flag;
 144         int no_x11_forwarding_flag;
 145         int no_pty_flag;
 146         /* "command=" option. */
 147         unsigned char * forced_command;
 148
 149 };
 150 #endif
 151
 152 #endif /* _AUTH_H_ */