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 DROPBEAR_AUTH_H_
  26 #define DROPBEAR_AUTH_H_
  27
  28 #include "includes.h"
  29 #include "signkey.h"
  30 #include "chansession.h"
  31
  32 void svr_authinitialise(void);
  33 void cli_authinitialise(void);
  34
  35 /* Server functions */
  36 void recv_msg_userauth_request(void);
  37 void send_msg_userauth_failure(int partial, int incrfail);
  38 void send_msg_userauth_success(void);
  39 void send_msg_userauth_banner(buffer *msg);
  40 void svr_auth_password(void);
  41 void svr_auth_pubkey(void);
  42 void svr_auth_pam(void);
  43
  44 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
  45 int svr_pubkey_allows_agentfwd(void);
  46 int svr_pubkey_allows_tcpfwd(void);
  47 int svr_pubkey_allows_x11fwd(void);
  48 int svr_pubkey_allows_pty(void);
  49 void svr_pubkey_set_forced_command(struct ChanSess *chansess);
  50 void svr_pubkey_options_cleanup(void);
  51 int svr_add_pubkey_options(buffer *options_buf, int line_num, const char* filename);
  52 #else
  53 /* no option : success */
  54 #define svr_pubkey_allows_agentfwd() 1
  55 #define svr_pubkey_allows_tcpfwd() 1
  56 #define svr_pubkey_allows_x11fwd() 1
  57 #define svr_pubkey_allows_pty() 1
  58 static inline void svr_pubkey_set_forced_command(struct ChanSess *chansess) { }
  59 static inline void svr_pubkey_options_cleanup(void) { }
  60 #define svr_add_pubkey_options(x,y,z) DROPBEAR_SUCCESS
  61 #endif
  62
  63 /* Client functions */
  64 void recv_msg_userauth_failure(void);
  65 void recv_msg_userauth_success(void);
  66 void recv_msg_userauth_specific_60(void);
  67 void recv_msg_userauth_pk_ok(void);
  68 void recv_msg_userauth_info_request(void);
  69 void cli_get_user(void);
  70 void cli_auth_getmethods(void);
  71 int cli_auth_try(void);
  72 void recv_msg_userauth_banner(void);
  73 void cli_pubkeyfail(void);
  74 void cli_auth_password(void);
  75 int cli_auth_pubkey(void);
  76 void cli_auth_interactive(void);
  77 char* getpass_or_cancel(char* prompt);
  78 void cli_auth_pubkey_cleanup(void);
  79
  80
  81 #define MAX_USERNAME_LEN 25 /* arbitrary for the moment */
  82
  83 #define AUTH_TYPE_NONE      1
  84 #define AUTH_TYPE_PUBKEY    (1 << 1)
  85 #define AUTH_TYPE_PASSWORD  (1 << 2)
  86 #define AUTH_TYPE_INTERACT  (1 << 3)
  87
  88 #define AUTH_METHOD_NONE "none"
  89 #define AUTH_METHOD_NONE_LEN 4
  90 #define AUTH_METHOD_PUBKEY "publickey"
  91 #define AUTH_METHOD_PUBKEY_LEN 9
  92 #define AUTH_METHOD_PASSWORD "password"
  93 #define AUTH_METHOD_PASSWORD_LEN 8
  94 #define AUTH_METHOD_INTERACT "keyboard-interactive"
  95 #define AUTH_METHOD_INTERACT_LEN 20
  96
  97
  98
  99 /* This structure is shared between server and client - it contains
 100  * relatively little extraneous bits when used for the client rather than the
 101  * server */
 102 struct AuthState {
 103         char *username; /* This is the username the client presents to check. It
 104                                            is updated each run through, used for auth checking */
 105         unsigned char authtypes; /* Flags indicating which auth types are still
 106                                                                 valid */
 107         unsigned int failcount; /* Number of (failed) authentication attempts.*/
 108         unsigned authdone : 1; /* 0 if we haven't authed, 1 if we have. Applies for
 109                                                           client and server (though has differing
 110                                                           meanings). */
 111         unsigned perm_warn : 1; /* Server only, set if bad permissions on
 112                                                            ~/.ssh/authorized_keys have already been
 113                                                            logged. */
 114
 115         /* These are only used for the server */
 116         uid_t pw_uid;
 117         gid_t pw_gid;
 118         char *pw_dir;
 119         char *pw_shell;
 120         char *pw_name;
 121         char *pw_passwd;
 122 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
 123         struct PubKeyOptions* pubkey_options;
 124 #endif
 125 };
 126
 127 #ifdef ENABLE_SVR_PUBKEY_OPTIONS
 128 struct PubKeyOptions;
 129 struct PubKeyOptions {
 130         /* Flags */
 131         int no_port_forwarding_flag;
 132         int no_agent_forwarding_flag;
 133         int no_x11_forwarding_flag;
 134         int no_pty_flag;
 135         /* "command=" option. */
 136         char * forced_command;
 137 };
 138 #endif
 139
 140 #endif /* DROPBEAR_AUTH_H_ */