annotate mercurial/wireprotoserver.py @ 36855:2cdf47e14c30

hgweb: refactor the request draining code

The previous code for draining was only invoked in a few places in
the wire protocol. Behavior wasn't consist. Furthermore, it was
difficult to reason about.

With us converting the input stream to a capped reader, it is now
safe to always drain the input stream when its size is known because
we can never overrun the input and read into the next HTTP request.
The only question is "should we?"

This commit changes the draining code so every request is examined.
Draining now kicks in for a few requests where it wouldn't before.
But I think the code is sufficiently restricted so the behavior is
safe. Possibly the most dangerous part of this code is the issuing
of Connection: close for POST and PUT requests that don't have a
Content-Length. I don't think there are any such uses in our WSGI
application, so this should be safe.

In the near future, I plan to significantly refactor the WSGI
response handling. I anticipate this code evolving a bit. So any
minor regressions around draining or connection closing behavior
might be fixed as a result of that work.

All tests pass with this change. That scares me a bit because it
means we are lacking low-level tests for the HTTP protocol.

Differential Revision: https://phab.mercurial-scm.org/D2769

# Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import contextlib
import struct
import sys
import threading

from .i18n import _
from . import (
    encoding,
    error,
    hook,
    pycompat,
    util,
    wireproto,
    wireprototypes,
)

stringio = util.stringio

urlerr = util.urlerr
urlreq = util.urlreq

HTTP_OK = 200

HGTYPE = 'application/mercurial-0.1'
HGTYPE2 = 'application/mercurial-0.2'
HGERRTYPE = 'application/hg-error'

SSHV1 = wireprototypes.SSHV1
SSHV2 = wireprototypes.SSHV2

def decodevaluefromheaders(req, headerprefix):
    """Decode a long value from multiple HTTP request headers.

    Returns the value as a bytes, not a str.
    """
    chunks = []
    i = 1
    while True:
        v = req.headers.get(b'%s-%d' % (headerprefix, i))
        if v is None:
            break
        chunks.append(pycompat.bytesurl(v))
        i += 1

    return ''.join(chunks)

class httpv1protocolhandler(wireprototypes.baseprotocolhandler):
    def __init__(self, wsgireq, req, ui, checkperm):
        self._wsgireq = wsgireq
        self._req = req
        self._ui = ui
        self._checkperm = checkperm

    @property
    def name(self):
        return 'http-v1'

    def getargs(self, args):
        knownargs = self._args()
        data = {}
        keys = args.split()
        for k in keys:
            if k == '*':
                star = {}
                for key in knownargs.keys():
                    if key != 'cmd' and key not in keys:
                        star[key] = knownargs[key][0]
                data['*'] = star
            else:
                data[k] = knownargs[k][0]
        return [data[k] for k in keys]

    def _args(self):
        args = util.rapply(pycompat.bytesurl, self._wsgireq.form.copy())
        postlen = int(self._req.headers.get(b'X-HgArgs-Post', 0))
        if postlen:
            args.update(urlreq.parseqs(
                self._wsgireq.inp.read(postlen), keep_blank_values=True))
            return args

        argvalue = decodevaluefromheaders(self._req, b'X-HgArg')
        args.update(urlreq.parseqs(argvalue, keep_blank_values=True))
        return args

    def forwardpayload(self, fp):
        # Existing clients *always* send Content-Length.
        length = int(self._req.headers[b'Content-Length'])

        # If httppostargs is used, we need to read Content-Length
        # minus the amount that was consumed by args.
        length -= int(self._req.headers.get(b'X-HgArgs-Post', 0))
        for s in util.filechunkiter(self._wsgireq.inp, limit=length):
            fp.write(s)

    @contextlib.contextmanager
    def mayberedirectstdio(self):
        oldout = self._ui.fout
        olderr = self._ui.ferr

        out = util.stringio()

        try:
            self._ui.fout = out
            self._ui.ferr = out
            yield out
        finally:
            self._ui.fout = oldout
            self._ui.ferr = olderr

    def client(self):
        return 'remote:%s:%s:%s' % (
            self._wsgireq.env.get('wsgi.url_scheme') or 'http',
            urlreq.quote(self._wsgireq.env.get('REMOTE_HOST', '')),
            urlreq.quote(self._wsgireq.env.get('REMOTE_USER', '')))

    def addcapabilities(self, repo, caps):
        caps.append('httpheader=%d' %
                    repo.ui.configint('server', 'maxhttpheaderlen'))
        if repo.ui.configbool('experimental', 'httppostargs'):
            caps.append('httppostargs')

        # FUTURE advertise 0.2rx once support is implemented
        # FUTURE advertise minrx and mintx after consulting config option
        caps.append('httpmediatype=0.1rx,0.1tx,0.2tx')

        compengines = wireproto.supportedcompengines(repo.ui, util.SERVERROLE)
        if compengines:
            comptypes = ','.join(urlreq.quote(e.wireprotosupport().name)
                                 for e in compengines)
            caps.append('compression=%s' % comptypes)

        return caps

    def checkperm(self, perm):
        return self._checkperm(perm)

# This method exists mostly so that extensions like remotefilelog can
# disable a kludgey legacy method only over http. As of early 2018,
# there are no other known users, so with any luck we can discard this
# hook if remotefilelog becomes a first-party extension.
def iscmd(cmd):
    return cmd in wireproto.commands

def handlewsgirequest(rctx, wsgireq, req, checkperm):
    """Possibly process a wire protocol request.

    If the current request is a wire protocol request, the request is
    processed by this function.

    ``wsgireq`` is a ``wsgirequest`` instance.
    ``req`` is a ``parsedrequest`` instance.

    Returns a 2-tuple of (bool, response) where the 1st element indicates
    whether the request was handled and the 2nd element is a return
    value for a WSGI application (often a generator of bytes).
    """
    # Avoid cycle involving hg module.
    from .hgweb import common as hgwebcommon

    repo = rctx.repo

    # HTTP version 1 wire protocol requests are denoted by a "cmd" query
    # string parameter. If it isn't present, this isn't a wire protocol
    # request.
    if 'cmd' not in req.querystringdict:
        return False, None

    cmd = req.querystringdict['cmd'][0]

    # The "cmd" request parameter is used by both the wire protocol and hgweb.
    # While not all wire protocol commands are available for all transports,
    # if we see a "cmd" value that resembles a known wire protocol command, we
    # route it to a protocol handler. This is better than routing possible
    # wire protocol requests to hgweb because it prevents hgweb from using
    # known wire protocol commands and it is less confusing for machine
    # clients.
    if not iscmd(cmd):
        return False, None

    # The "cmd" query string argument is only valid on the root path of the
    # repo. e.g. ``/?cmd=foo``, ``/repo?cmd=foo``. URL paths within the repo
    # like ``/blah?cmd=foo`` are not allowed. So don't recognize the request
    # in this case. We send an HTTP 404 for backwards compatibility reasons.
    if req.dispatchpath:
        res = _handlehttperror(
            hgwebcommon.ErrorResponse(hgwebcommon.HTTP_NOT_FOUND), wsgireq,
            req)

        return True, res

    proto = httpv1protocolhandler(wsgireq, req, repo.ui,
                                  lambda perm: checkperm(rctx, wsgireq, perm))

    # The permissions checker should be the only thing that can raise an
    # ErrorResponse. It is kind of a layer violation to catch an hgweb
    # exception here. So consider refactoring into a exception type that
    # is associated with the wire protocol.
    try:
        res = _callhttp(repo, wsgireq, req, proto, cmd)
    except hgwebcommon.ErrorResponse as e:
        res = _handlehttperror(e, wsgireq, req)

    return True, res

def _httpresponsetype(ui, req, prefer_uncompressed):
    """Determine the appropriate response type and compression settings.

    Returns a tuple of (mediatype, compengine, engineopts).
    """
    # Determine the response media type and compression engine based
    # on the request parameters.
    protocaps = decodevaluefromheaders(req, 'X-HgProto').split(' ')

    if '0.2' in protocaps:
        # All clients are expected to support uncompressed data.
        if prefer_uncompressed:
            return HGTYPE2, util._noopengine(), {}

        # Default as defined by wire protocol spec.
        compformats = ['zlib', 'none']
        for cap in protocaps:
            if cap.startswith('comp='):
                compformats = cap[5:].split(',')
                break

        # Now find an agreed upon compression format.
        for engine in wireproto.supportedcompengines(ui, util.SERVERROLE):
            if engine.wireprotosupport().name in compformats:
                opts = {}
                level = ui.configint('server', '%slevel' % engine.name())
                if level is not None:
                    opts['level'] = level

                return HGTYPE2, engine, opts

        # No mutually supported compression format. Fall back to the
        # legacy protocol.

    # Don't allow untrusted settings because disabling compression or
    # setting a very high compression level could lead to flooding
    # the server's network or CPU.
    opts = {'level': ui.configint('server', 'zliblevel')}
    return HGTYPE, util.compengines['zlib'], opts

def _callhttp(repo, wsgireq, req, proto, cmd):
    def genversion2(gen, engine, engineopts):
        # application/mercurial-0.2 always sends a payload header
        # identifying the compression engine.
        name = engine.wireprotosupport().name
        assert 0 < len(name) < 256
        yield struct.pack('B', len(name))
        yield name

        for chunk in gen:
            yield chunk

    if not wireproto.commands.commandavailable(cmd, proto):
        wsgireq.respond(HTTP_OK, HGERRTYPE,
                        body=_('requested wire protocol command is not '
                               'available over HTTP'))
        return []

    proto.checkperm(wireproto.commands[cmd].permission)

    rsp = wireproto.dispatch(repo, proto, cmd)

    if isinstance(rsp, bytes):
        wsgireq.respond(HTTP_OK, HGTYPE, body=rsp)
        return []
    elif isinstance(rsp, wireprototypes.bytesresponse):
        wsgireq.respond(HTTP_OK, HGTYPE, body=rsp.data)
        return []
    elif isinstance(rsp, wireprototypes.streamreslegacy):
        gen = rsp.gen
        wsgireq.respond(HTTP_OK, HGTYPE)
        return gen
    elif isinstance(rsp, wireprototypes.streamres):
        gen = rsp.gen

        # This code for compression should not be streamres specific. It
        # is here because we only compress streamres at the moment.
        mediatype, engine, engineopts = _httpresponsetype(
            repo.ui, req, rsp.prefer_uncompressed)
        gen = engine.compressstream(gen, engineopts)

        if mediatype == HGTYPE2:
            gen = genversion2(gen, engine, engineopts)

        wsgireq.respond(HTTP_OK, mediatype)
        return gen
    elif isinstance(rsp, wireprototypes.pushres):
        rsp = '%d\n%s' % (rsp.res, rsp.output)
        wsgireq.respond(HTTP_OK, HGTYPE, body=rsp)
        return []
    elif isinstance(rsp, wireprototypes.pusherr):
        rsp = '0\n%s\n' % rsp.res
        wsgireq.respond(HTTP_OK, HGTYPE, body=rsp)
        return []
    elif isinstance(rsp, wireprototypes.ooberror):
        rsp = rsp.message
        wsgireq.respond(HTTP_OK, HGERRTYPE, body=rsp)
        return []
    raise error.ProgrammingError('hgweb.protocol internal failure', rsp)

def _handlehttperror(e, wsgireq, req):
    """Called when an ErrorResponse is raised during HTTP request processing."""

    # TODO This response body assumes the failed command was
    # "unbundle." That assumption is not always valid.
    wsgireq.respond(e, HGTYPE, body='0\n%s\n' % pycompat.bytestr(e))

    return ''

def _sshv1respondbytes(fout, value):
    """Send a bytes response for protocol version 1."""
    fout.write('%d\n' % len(value))
    fout.write(value)
    fout.flush()

def _sshv1respondstream(fout, source):
    write = fout.write
    for chunk in source.gen:
        write(chunk)
    fout.flush()

def _sshv1respondooberror(fout, ferr, rsp):
    ferr.write(b'%s\n-\n' % rsp)
    ferr.flush()
    fout.write(b'\n')
    fout.flush()

class sshv1protocolhandler(wireprototypes.baseprotocolhandler):
    """Handler for requests services via version 1 of SSH protocol."""
    def __init__(self, ui, fin, fout):
        self._ui = ui
        self._fin = fin
        self._fout = fout

    @property
    def name(self):
        return wireprototypes.SSHV1

    def getargs(self, args):
        data = {}
        keys = args.split()
        for n in xrange(len(keys)):
            argline = self._fin.readline()[:-1]
            arg, l = argline.split()
            if arg not in keys:
                raise error.Abort(_("unexpected parameter %r") % arg)
            if arg == '*':
                star = {}
                for k in xrange(int(l)):
                    argline = self._fin.readline()[:-1]
                    arg, l = argline.split()
                    val = self._fin.read(int(l))
                    star[arg] = val
                data['*'] = star
            else:
                val = self._fin.read(int(l))
                data[arg] = val
        return [data[k] for k in keys]

    def forwardpayload(self, fpout):
        # We initially send an empty response. This tells the client it is
        # OK to start sending data. If a client sees any other response, it
        # interprets it as an error.
        _sshv1respondbytes(self._fout, b'')

        # The file is in the form:
        #
        # <chunk size>\n<chunk>
        # ...
        # 0\n
        count = int(self._fin.readline())
        while count:
            fpout.write(self._fin.read(count))
            count = int(self._fin.readline())

    @contextlib.contextmanager
    def mayberedirectstdio(self):
        yield None

    def client(self):
        client = encoding.environ.get('SSH_CLIENT', '').split(' ', 1)[0]
        return 'remote:ssh:' + client

    def addcapabilities(self, repo, caps):
        return caps

    def checkperm(self, perm):
        pass

class sshv2protocolhandler(sshv1protocolhandler):
    """Protocol handler for version 2 of the SSH protocol."""

    @property
    def name(self):
        return wireprototypes.SSHV2

def _runsshserver(ui, repo, fin, fout, ev):
    # This function operates like a state machine of sorts. The following
    # states are defined:
    #
    # protov1-serving
    #    Server is in protocol version 1 serving mode. Commands arrive on
    #    new lines. These commands are processed in this state, one command
    #    after the other.
    #
    # protov2-serving
    #    Server is in protocol version 2 serving mode.
    #
    # upgrade-initial
    #    The server is going to process an upgrade request.
    #
    # upgrade-v2-filter-legacy-handshake
    #    The protocol is being upgraded to version 2. The server is expecting
    #    the legacy handshake from version 1.
    #
    # upgrade-v2-finish
    #    The upgrade to version 2 of the protocol is imminent.
    #
    # shutdown
    #    The server is shutting down, possibly in reaction to a client event.
    #
    # And here are their transitions:
    #
    # protov1-serving -> shutdown
    #    When server receives an empty request or encounters another
    #    error.
    #
    # protov1-serving -> upgrade-initial
    #    An upgrade request line was seen.
    #
    # upgrade-initial -> upgrade-v2-filter-legacy-handshake
    #    Upgrade to version 2 in progress. Server is expecting to
    #    process a legacy handshake.
    #
    # upgrade-v2-filter-legacy-handshake -> shutdown
    #    Client did not fulfill upgrade handshake requirements.
    #
    # upgrade-v2-filter-legacy-handshake -> upgrade-v2-finish
    #    Client fulfilled version 2 upgrade requirements. Finishing that
    #    upgrade.
    #
    # upgrade-v2-finish -> protov2-serving
    #    Protocol upgrade to version 2 complete. Server can now speak protocol
    #    version 2.
    #
    # protov2-serving -> protov1-serving
    #    Ths happens by default since protocol version 2 is the same as
    #    version 1 except for the handshake.

    state = 'protov1-serving'
    proto = sshv1protocolhandler(ui, fin, fout)
    protoswitched = False

    while not ev.is_set():
        if state == 'protov1-serving':
            # Commands are issued on new lines.
            request = fin.readline()[:-1]

            # Empty lines signal to terminate the connection.
            if not request:
                state = 'shutdown'
                continue

            # It looks like a protocol upgrade request. Transition state to
            # handle it.
            if request.startswith(b'upgrade '):
                if protoswitched:
                    _sshv1respondooberror(fout, ui.ferr,
                                          b'cannot upgrade protocols multiple '
                                          b'times')
                    state = 'shutdown'
                    continue

                state = 'upgrade-initial'
                continue

            available = wireproto.commands.commandavailable(request, proto)

            # This command isn't available. Send an empty response and go
            # back to waiting for a new command.
            if not available:
                _sshv1respondbytes(fout, b'')
                continue

            rsp = wireproto.dispatch(repo, proto, request)

            if isinstance(rsp, bytes):
                _sshv1respondbytes(fout, rsp)
            elif isinstance(rsp, wireprototypes.bytesresponse):
                _sshv1respondbytes(fout, rsp.data)
            elif isinstance(rsp, wireprototypes.streamres):
                _sshv1respondstream(fout, rsp)
            elif isinstance(rsp, wireprototypes.streamreslegacy):
                _sshv1respondstream(fout, rsp)
            elif isinstance(rsp, wireprototypes.pushres):
                _sshv1respondbytes(fout, b'')
                _sshv1respondbytes(fout, b'%d' % rsp.res)
            elif isinstance(rsp, wireprototypes.pusherr):
                _sshv1respondbytes(fout, rsp.res)
            elif isinstance(rsp, wireprototypes.ooberror):
                _sshv1respondooberror(fout, ui.ferr, rsp.message)
            else:
                raise error.ProgrammingError('unhandled response type from '
                                             'wire protocol command: %s' % rsp)

        # For now, protocol version 2 serving just goes back to version 1.
        elif state == 'protov2-serving':
            state = 'protov1-serving'
            continue

        elif state == 'upgrade-initial':
            # We should never transition into this state if we've switched
            # protocols.
            assert not protoswitched
            assert proto.name == wireprototypes.SSHV1

            # Expected: upgrade <token> <capabilities>
            # If we get something else, the request is malformed. It could be
            # from a future client that has altered the upgrade line content.
            # We treat this as an unknown command.
            try:
                token, caps = request.split(b' ')[1:]
            except ValueError:
                _sshv1respondbytes(fout, b'')
                state = 'protov1-serving'
                continue

            # Send empty response if we don't support upgrading protocols.
            if not ui.configbool('experimental', 'sshserver.support-v2'):
                _sshv1respondbytes(fout, b'')
                state = 'protov1-serving'
                continue

            try:
                caps = urlreq.parseqs(caps)
            except ValueError:
                _sshv1respondbytes(fout, b'')
                state = 'protov1-serving'
                continue

            # We don't see an upgrade request to protocol version 2. Ignore
            # the upgrade request.
            wantedprotos = caps.get(b'proto', [b''])[0]
            if SSHV2 not in wantedprotos:
                _sshv1respondbytes(fout, b'')
                state = 'protov1-serving'
                continue

            # It looks like we can honor this upgrade request to protocol 2.
            # Filter the rest of the handshake protocol request lines.
            state = 'upgrade-v2-filter-legacy-handshake'
            continue

        elif state == 'upgrade-v2-filter-legacy-handshake':
            # Client should have sent legacy handshake after an ``upgrade``
            # request. Expected lines:
            #
            #    hello
            #    between
            #    pairs 81
            #    0000...-0000...

            ok = True
            for line in (b'hello', b'between', b'pairs 81'):
                request = fin.readline()[:-1]

                if request != line:
                    _sshv1respondooberror(fout, ui.ferr,
                                          b'malformed handshake protocol: '
                                          b'missing %s' % line)
                    ok = False
                    state = 'shutdown'
                    break

            if not ok:
                continue

            request = fin.read(81)
            if request != b'%s-%s' % (b'0' * 40, b'0' * 40):
                _sshv1respondooberror(fout, ui.ferr,
                                      b'malformed handshake protocol: '
                                      b'missing between argument value')
                state = 'shutdown'
                continue

            state = 'upgrade-v2-finish'
            continue

        elif state == 'upgrade-v2-finish':
            # Send the upgrade response.
            fout.write(b'upgraded %s %s\n' % (token, SSHV2))
            servercaps = wireproto.capabilities(repo, proto)
            rsp = b'capabilities: %s' % servercaps.data
            fout.write(b'%d\n%s\n' % (len(rsp), rsp))
            fout.flush()

            proto = sshv2protocolhandler(ui, fin, fout)
            protoswitched = True

            state = 'protov2-serving'
            continue

        elif state == 'shutdown':
            break

        else:
            raise error.ProgrammingError('unhandled ssh server state: %s' %
                                         state)

class sshserver(object):
    def __init__(self, ui, repo, logfh=None):
        self._ui = ui
        self._repo = repo
        self._fin = ui.fin
        self._fout = ui.fout

        # Log write I/O to stdout and stderr if configured.
        if logfh:
            self._fout = util.makeloggingfileobject(
                logfh, self._fout, 'o', logdata=True)
            ui.ferr = util.makeloggingfileobject(
                logfh, ui.ferr, 'e', logdata=True)

        hook.redirect(True)
        ui.fout = repo.ui.fout = ui.ferr

        # Prevent insertion/deletion of CRs
        util.setbinary(self._fin)
        util.setbinary(self._fout)

    def serve_forever(self):
        self.serveuntil(threading.Event())
        sys.exit(0)

    def serveuntil(self, ev):
        """Serve until a threading.Event is set."""
        _runsshserver(self._ui, self._repo, self._fin, self._fout, ev)