upstream/mercurial-mirror Files · mercurial/node.py

hgweb: support Content Security Policy...

hgweb: support Content Security Policy Content-Security-Policy (CSP) is a web security feature that allows servers to declare what loaded content is allowed to do. For example, a policy can prevent loading of images, JavaScript, CSS, etc unless the source of that content is whitelisted (by hostname, URI scheme, hashes of content, etc). It's a nifty security feature that provides extra mitigation against some attacks, notably XSS. Mitigation against these attacks is important for Mercurial because hgweb renders repository data, which is commonly untrusted. While we make attempts to escape things, etc, there's the possibility that malicious data could be injected into the site content. If this happens today, the full power of the web browser is available to that malicious content. A restrictive CSP policy (defined by the server operator and sent in an HTTP header which is outside the control of malicious content), could restrict browser capabilities and mitigate security problems posed by malicious data. CSP works by emitting an HTTP header declaring the policy that browsers should apply. Ideally, this header would be emitted by a layer above Mercurial (likely the HTTP server doing the WSGI "proxying"). This works for some CSP policies, but not all. For example, policies to allow inline JavaScript may require setting a "nonce" attribute on <script>. This attribute value must be unique and non-guessable. And, the value must be present in the HTTP header and the HTML body. This means that coordinating the value between Mercurial and another HTTP server could be difficult: it is much easier to generate and emit the nonce in a central location. This commit introduces support for emitting a Content-Security-Policy header from hgweb. A config option defines the header value. If present, the header is emitted. A special "%nonce%" syntax in the value triggers generation of a nonce and inclusion in <script> elements in templates. The inclusion of a nonce does not occur unless "%nonce%" is present. This makes this commit completely backwards compatible and the feature opt-in. The nonce is a type 4 UUID, which is the flavor that is randomly generated. It has 122 random bits, which should be plenty to satisfy the guarantees of a nonce.

Durham Goode - - Load All Authors

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        Martin Geisler
    
put license and copyright info into comment blocks

              r8226
            
      # node.py - basic nodeid manipulation for mercurial

      #

      # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>

      #

      # This software may be used and distributed according to the terms of the

        Matt Mackall
    
Update license to GPLv2+

              r10263
            
      # GNU General Public License version 2 or any later version.

        mpm@selenic.com
    
Break apart hg.py...

              r1089
            
        Gregory Szorc
    
node: use absolute_import

              r25962
            
      from __future__ import absolute_import

        Matt Mackall
    
Replace demandload with new demandimport

              r3877
            
      import binascii

        mpm@selenic.com
    
Break apart hg.py...

              r1089
            
        Siddharth Agarwal
    
node: add 'nullhex', hex-encoded nullid...

              r26980
            
      # This ugly style has a noticeable effect in manifest parsing

      hex = binascii.hexlify

      bin = binascii.unhexlify

        Thomas Arendsen Hein
    
Define and use nullrev (revision of nullid) instead of -1.

              r3578
            
      nullrev = -1

        Gregory Szorc
    
node: use byte literals to construct nullid and wdirid...

              r28585
            
      nullid = b"\0" * 20

        Siddharth Agarwal
    
node: add 'nullhex', hex-encoded nullid...

              r26980
            
      nullhex = hex(nullid)

        mpm@selenic.com
    
Break apart hg.py...

              r1089
            
        Durham Goode
    
dirstate: change placeholder hash length to 20 bytes...

              r30360
            
      # Phony node value to stand-in for new files in some uses of

      # manifests.

      newnodeid = '!' * 20

        Durham Goode
    
dirstate: change added/modified placeholder hash length to 20 bytes...

              r30361
            
      addednodeid = ('0' * 15) + 'added'

      modifiednodeid = ('0' * 12) + 'modified'

        Durham Goode
    
dirstate: change placeholder hash length to 20 bytes...

              r30360
            
        Durham Goode
    
dirstate: change added/modified placeholder hash length to 20 bytes...

              r30361
            
      wdirnodes = set((newnodeid, addednodeid, modifiednodeid))

        Durham Goode
    
dirstate: change placeholder hash length to 20 bytes...

              r30360
            
        Yuya Nishihara
    
node: define experimental identifiers for working directory...

              r25737
            
      # pseudo identifiers for working directory

      # (they are experimental, so don't add too many dependencies on them)

      wdirrev = 0x7fffffff

        Gregory Szorc
    
node: use byte literals to construct nullid and wdirid...

              r28585
            
      wdirid = b"\xff" * 20

        Yuya Nishihara
    
node: define experimental identifiers for working directory...

              r25737
            
        mpm@selenic.com
    
Break apart hg.py...

              r1089
            
      def short(node):

          return hex(node[:6])

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Martin Geisler put license and copyright info into comment blocks	r8226	# node.py - basic nodeid manipulation for mercurial
		#
		# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
		#
		# This software may be used and distributed according to the terms of the
Matt Mackall Update license to GPLv2+	r10263	# GNU General Public License version 2 or any later version.
mpm@selenic.com Break apart hg.py...	r1089
Gregory Szorc node: use absolute_import	r25962	from __future__ import absolute_import

Matt Mackall Replace demandload with new demandimport	r3877	import binascii
mpm@selenic.com Break apart hg.py...	r1089
Siddharth Agarwal node: add 'nullhex', hex-encoded nullid...	r26980	# This ugly style has a noticeable effect in manifest parsing
		hex = binascii.hexlify
		bin = binascii.unhexlify

Thomas Arendsen Hein Define and use nullrev (revision of nullid) instead of -1.	r3578	nullrev = -1
Gregory Szorc node: use byte literals to construct nullid and wdirid...	r28585	nullid = b"\0" * 20
Siddharth Agarwal node: add 'nullhex', hex-encoded nullid...	r26980	nullhex = hex(nullid)
mpm@selenic.com Break apart hg.py...	r1089
Durham Goode dirstate: change placeholder hash length to 20 bytes...	r30360	# Phony node value to stand-in for new files in some uses of
		# manifests.
		newnodeid = '!' * 20
Durham Goode dirstate: change added/modified placeholder hash length to 20 bytes...	r30361	addednodeid = ('0' * 15) + 'added'
		modifiednodeid = ('0' * 12) + 'modified'
Durham Goode dirstate: change placeholder hash length to 20 bytes...	r30360
Durham Goode dirstate: change added/modified placeholder hash length to 20 bytes...	r30361	wdirnodes = set((newnodeid, addednodeid, modifiednodeid))
Durham Goode dirstate: change placeholder hash length to 20 bytes...	r30360
Yuya Nishihara node: define experimental identifiers for working directory...	r25737	# pseudo identifiers for working directory
		# (they are experimental, so don't add too many dependencies on them)
		wdirrev = 0x7fffffff
Gregory Szorc node: use byte literals to construct nullid and wdirid...	r28585	wdirid = b"\xff" * 20
Yuya Nishihara node: define experimental identifiers for working directory...	r25737
mpm@selenic.com Break apart hg.py...	r1089	def short(node):
		return hex(node[:6])