Mercurial > dropbear
annotate cli-session.c @ 36:a600c015562d
Handle differing c2s and s2c algorithms properly
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 29 Jul 2004 15:43:26 +0000 |
| parents | 0ad5fb979f42 |
| children | 0913e2ee3545 |
| rev | line source |
|---|---|
| 26 | 1 #include "includes.h" |
| 2 #include "session.h" | |
| 3 #include "dbutil.h" | |
| 4 #include "kex.h" | |
| 5 #include "ssh.h" | |
| 6 #include "packet.h" | |
| 7 #include "tcpfwd-direct.h" | |
| 8 #include "tcpfwd-remote.h" | |
| 9 #include "channel.h" | |
| 10 #include "random.h" | |
| 33 | 11 #include "service.h" |
| 26 | 12 |
| 13 static void cli_remoteclosed(); | |
| 14 static void cli_sessionloop(); | |
| 33 | 15 static void cli_session_init(); |
| 26 | 16 |
| 17 struct clientsession cli_ses; /* GLOBAL */ | |
| 18 | |
| 19 static const packettype cli_packettypes[] = { | |
| 20 /* TYPE, AUTHREQUIRED, FUNCTION */ | |
| 21 {SSH_MSG_KEXINIT, recv_msg_kexinit}, | |
| 22 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, // client | |
| 23 {SSH_MSG_NEWKEYS, recv_msg_newkeys}, | |
|
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parents:
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24 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, // client |
| 26 | 25 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data}, |
| 26 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust}, | |
| 27 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp}, | |
| 28 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request}, | |
| 29 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open}, | |
| 30 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof}, | |
| 31 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close}, | |
| 32 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation}, | |
| 33 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure}, | |
|
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Client mostly works up to password auth
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parents:
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34 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, // client |
|
e2a1eaa19f22
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parents:
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35 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, // client |
| 26 | 36 {0, 0} /* End */ |
| 37 }; | |
| 38 | |
| 39 static const struct ChanType *cli_chantypes[] = { | |
| 40 // &clichansess, | |
| 41 /* &chan_tcpdirect etc, though need to only allow if we've requested | |
| 42 * that forwarding */ | |
| 43 NULL /* Null termination */ | |
| 44 }; | |
| 33 | 45 |
| 26 | 46 void cli_session(int sock, char* remotehost) { |
| 47 | |
| 48 crypto_init(); | |
| 49 common_session_init(sock, remotehost); | |
| 50 | |
| 51 chaninitialise(cli_chantypes); | |
| 52 | |
| 53 | |
| 33 | 54 /* Set up cli_ses vars */ |
| 55 cli_session_init(); | |
| 26 | 56 |
| 57 /* Ready to go */ | |
| 58 sessinitdone = 1; | |
| 59 | |
| 60 /* Exchange identification */ | |
| 61 session_identification(); | |
| 62 | |
| 63 seedrandom(); | |
| 64 | |
| 65 send_msg_kexinit(); | |
| 66 | |
| 67 /* XXX here we do stuff differently */ | |
| 68 | |
| 69 session_loop(cli_sessionloop); | |
| 70 | |
| 71 /* Not reached */ | |
| 72 | |
| 33 | 73 } |
| 26 | 74 |
| 33 | 75 static void cli_session_init() { |
| 76 | |
| 77 cli_ses.state = STATE_NOTHING; | |
| 78 cli_ses.kex_state = KEX_NOTHING; | |
| 79 | |
| 80 /* For printing "remote host closed" for the user */ | |
| 81 ses.remoteclosed = cli_remoteclosed; | |
| 82 ses.buf_match_algo = cli_buf_match_algo; | |
| 83 | |
| 84 /* packet handlers */ | |
| 85 ses.packettypes = cli_packettypes; | |
|
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0ad5fb979f42
set the isserver flag (oops)
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86 |
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0ad5fb979f42
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87 ses.isserver = 0; |
| 26 | 88 } |
| 89 | |
| 33 | 90 /* This function drives the progress of the session - it initiates KEX, |
| 91 * service, userauth and channel requests */ | |
| 26 | 92 static void cli_sessionloop() { |
| 93 | |
| 33 | 94 TRACE(("enter cli_sessionloop")); |
| 95 | |
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parents:
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96 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) { |
|
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parents:
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97 cli_ses.kex_state = KEXINIT_RCVD; |
| 33 | 98 } |
| 99 | |
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34
e2a1eaa19f22
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parents:
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changeset
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100 if (cli_ses.kex_state == KEXINIT_RCVD) { |
| 33 | 101 |
| 102 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT | |
| 103 * negotiation would have failed. */ | |
| 104 send_msg_kexdh_init(); | |
| 105 cli_ses.kex_state = KEXDH_INIT_SENT; | |
| 106 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD")); | |
| 107 return; | |
| 108 } | |
| 109 | |
| 110 /* A KEX has finished, so we should go back to our KEX_NOTHING state */ | |
| 111 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0 | |
| 112 && ses.kexstate.sentkexinit == 0) { | |
| 113 cli_ses.kex_state = KEX_NOTHING; | |
| 114 } | |
| 115 | |
| 116 /* We shouldn't do anything else if a KEX is in progress */ | |
| 117 if (cli_ses.kex_state != KEX_NOTHING) { | |
| 118 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING")); | |
| 119 return; | |
| 120 } | |
| 121 | |
| 122 /* We should exit if we haven't donefirstkex: we shouldn't reach here | |
| 123 * in normal operation */ | |
| 124 if (ses.kexstate.donefirstkex == 0) { | |
| 125 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex")); | |
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parents:
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126 return; |
| 33 | 127 } |
| 128 | |
| 26 | 129 switch (cli_ses.state) { |
| 130 | |
| 33 | 131 case STATE_NOTHING: |
| 132 /* We've got the transport layer sorted, we now need to request | |
| 133 * userauth */ | |
| 134 send_msg_service_request(SSH_SERVICE_USERAUTH); | |
| 135 cli_ses.state = SERVICE_AUTH_REQ_SENT; | |
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Client mostly works up to password auth
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parents:
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136 TRACE(("leave cli_sessionloop: sent userauth service req")); |
| 33 | 137 return; |
| 26 | 138 |
| 33 | 139 /* userauth code */ |
| 140 case SERVICE_AUTH_ACCEPT_RCVD: | |
| 141 cli_auth_getmethods(); | |
| 142 cli_ses.state = USERAUTH_METHODS_SENT; | |
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34
e2a1eaa19f22
Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
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143 TRACE(("leave cli_sessionloop: sent userauth methods req")); |
| 33 | 144 return; |
| 145 | |
| 146 case USERAUTH_FAIL_RCVD: | |
| 147 cli_auth_try(); | |
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34
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Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents:
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148 TRACE(("leave cli_sessionloop: cli_auth_try")); |
| 33 | 149 return; |
| 150 | |
| 151 /* XXX more here needed */ | |
| 152 | |
| 153 | |
| 154 default: | |
| 155 break; | |
| 26 | 156 } |
| 157 | |
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34
e2a1eaa19f22
Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
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158 TRACE(("leave cli_sessionloop: fell out")); |
| 26 | 159 |
| 160 } | |
| 161 | |
| 162 /* called when the remote side closes the connection */ | |
| 163 static void cli_remoteclosed() { | |
| 164 | |
| 165 /* XXX TODO perhaps print a friendlier message if we get this but have | |
| 166 * already sent/received disconnect message(s) ??? */ | |
| 167 close(ses.sock); | |
| 168 ses.sock = -1; | |
| 33 | 169 dropbear_exit("remote closed the connection"); |
| 26 | 170 } |