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1 | 1 | # sshprotoext.py - Extension to test behavior of SSH protocol |
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2 | 2 | # |
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3 | 3 | # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com> |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms of the |
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6 | 6 | # GNU General Public License version 2 or any later version. |
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7 | 7 | |
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8 | 8 | # This extension replaces the SSH server started via `hg serve --stdio`. |
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9 | 9 | # The server behaves differently depending on environment variables. |
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10 | 10 | |
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11 | 11 | from __future__ import absolute_import |
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12 | 12 | |
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13 | 13 | from mercurial import ( |
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14 | 14 | error, |
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15 | 15 | extensions, |
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16 | 16 | registrar, |
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17 | 17 | sshpeer, |
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18 | 18 | wireproto, |
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19 | 19 | wireprotoserver, |
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20 | 20 | ) |
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21 | 21 | |
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22 | 22 | configtable = {} |
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23 | 23 | configitem = registrar.configitem(configtable) |
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24 | 24 | |
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25 | configitem('sshpeer', 'mode', default=None) | |
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26 | configitem('sshpeer', 'handshake-mode', default=None) | |
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25 | configitem(b'sshpeer', b'mode', default=None) | |
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26 | configitem(b'sshpeer', b'handshake-mode', default=None) | |
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27 | 27 | |
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28 | 28 | class bannerserver(wireprotoserver.sshserver): |
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29 | 29 | """Server that sends a banner to stdout.""" |
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30 | 30 | def serve_forever(self): |
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31 | 31 | for i in range(10): |
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32 | 32 | self._fout.write(b'banner: line %d\n' % i) |
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33 | 33 | |
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34 | 34 | super(bannerserver, self).serve_forever() |
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35 | 35 | |
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36 | 36 | class prehelloserver(wireprotoserver.sshserver): |
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37 | 37 | """Tests behavior when connecting to <0.9.1 servers. |
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38 | 38 | |
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39 | 39 | The ``hello`` wire protocol command was introduced in Mercurial |
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40 | 40 | 0.9.1. Modern clients send the ``hello`` command when connecting |
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41 | 41 | to SSH servers. This mock server tests behavior of the handshake |
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42 | 42 | when ``hello`` is not supported. |
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43 | 43 | """ |
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44 | 44 | def serve_forever(self): |
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45 | 45 | l = self._fin.readline() |
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46 | 46 | assert l == b'hello\n' |
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47 | 47 | # Respond to unknown commands with an empty reply. |
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48 | 48 | wireprotoserver._sshv1respondbytes(self._fout, b'') |
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49 | 49 | l = self._fin.readline() |
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50 | 50 | assert l == b'between\n' |
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51 | 51 | rsp = wireproto.dispatch(self._repo, self._proto, b'between') |
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52 | 52 | wireprotoserver._sshv1respondbytes(self._fout, rsp.data) |
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53 | 53 | |
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54 | 54 | super(prehelloserver, self).serve_forever() |
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55 | 55 | |
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56 | 56 | class upgradev2server(wireprotoserver.sshserver): |
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57 | 57 | """Tests behavior for clients that issue upgrade to version 2.""" |
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58 | 58 | def serve_forever(self): |
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59 | 59 | name = wireprotoserver.SSHV2 |
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60 | 60 | l = self._fin.readline() |
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61 | 61 | assert l.startswith(b'upgrade ') |
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62 | 62 | token, caps = l[:-1].split(b' ')[1:] |
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63 | 63 | assert caps == b'proto=%s' % name |
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64 | 64 | |
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65 | 65 | # Filter hello and between requests. |
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66 | 66 | l = self._fin.readline() |
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67 | 67 | assert l == b'hello\n' |
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68 | 68 | l = self._fin.readline() |
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69 | 69 | assert l == b'between\n' |
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70 | 70 | l = self._fin.readline() |
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71 | 71 | assert l == b'pairs 81\n' |
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72 | 72 | self._fin.read(81) |
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73 | 73 | |
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74 | 74 | # Send the upgrade response. |
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75 | 75 | self._fout.write(b'upgraded %s %s\n' % (token, name)) |
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76 | 76 | servercaps = wireproto.capabilities(self._repo, self._proto) |
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77 | 77 | rsp = b'capabilities: %s' % servercaps.data |
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78 | 78 | self._fout.write(b'%d\n' % len(rsp)) |
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79 | 79 | self._fout.write(rsp) |
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80 | 80 | self._fout.write(b'\n') |
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81 | 81 | self._fout.flush() |
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82 | 82 | |
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83 | 83 | super(upgradev2server, self).serve_forever() |
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84 | 84 | |
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85 | 85 | def performhandshake(orig, ui, stdin, stdout, stderr): |
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86 | 86 | """Wrapped version of sshpeer._performhandshake to send extra commands.""" |
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87 | 87 | mode = ui.config(b'sshpeer', b'handshake-mode') |
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88 | 88 | if mode == b'pre-no-args': |
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89 | 89 | ui.debug(b'sending no-args command\n') |
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90 | 90 | stdin.write(b'no-args\n') |
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91 | 91 | stdin.flush() |
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92 | 92 | return orig(ui, stdin, stdout, stderr) |
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93 | 93 | elif mode == b'pre-multiple-no-args': |
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94 | 94 | ui.debug(b'sending unknown1 command\n') |
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95 | 95 | stdin.write(b'unknown1\n') |
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96 | 96 | ui.debug(b'sending unknown2 command\n') |
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97 | 97 | stdin.write(b'unknown2\n') |
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98 | 98 | ui.debug(b'sending unknown3 command\n') |
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99 | 99 | stdin.write(b'unknown3\n') |
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100 | 100 | stdin.flush() |
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101 | 101 | return orig(ui, stdin, stdout, stderr) |
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102 | 102 | else: |
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103 | 103 | raise error.ProgrammingError(b'unknown HANDSHAKECOMMANDMODE: %s' % |
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104 | 104 | mode) |
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105 | 105 | |
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106 | 106 | def extsetup(ui): |
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107 | 107 | # It's easier for tests to define the server behavior via environment |
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108 | 108 | # variables than config options. This is because `hg serve --stdio` |
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109 | 109 | # has to be invoked with a certain form for security reasons and |
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110 | 110 | # `dummyssh` can't just add `--config` flags to the command line. |
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111 | 111 | servermode = ui.environ.get(b'SSHSERVERMODE') |
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112 | 112 | |
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113 | 113 | if servermode == b'banner': |
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114 | 114 | wireprotoserver.sshserver = bannerserver |
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115 | 115 | elif servermode == b'no-hello': |
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116 | 116 | wireprotoserver.sshserver = prehelloserver |
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117 | 117 | elif servermode == b'upgradev2': |
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118 | 118 | wireprotoserver.sshserver = upgradev2server |
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119 | 119 | elif servermode: |
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120 | 120 | raise error.ProgrammingError(b'unknown server mode: %s' % servermode) |
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121 | 121 | |
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122 | 122 | peermode = ui.config(b'sshpeer', b'mode') |
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123 | 123 | |
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124 | 124 | if peermode == b'extra-handshake-commands': |
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125 | 125 | extensions.wrapfunction(sshpeer, '_performhandshake', performhandshake) |
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126 | 126 | elif peermode: |
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127 | 127 | raise error.ProgrammingError(b'unknown peer mode: %s' % peermode) |
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