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block all SSH connections for VCS, for usabililty and security

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If we allow SSH, then we'd have to manage known_hosts.

All VCS and submodule URLs should use HTTPS.  SSH URLs have security vulns:
https://blogs.msdn.microsoft.com/devops/2017/08/15/git-vulnerability-with-submodules/
https://www.theregister.co.uk/2017/08/13/ssh_flaw_in_git_mercurial_svn/
CVE-2017-1000117

I did a manual scan of the setup on jenkins.debian.net to see if I could
find any suspicious URLs.  Looks good so far.  This is what I used:

find . -type f -print0 |xargs -0 grep -Eo 'ssh[:+][svn/]+...................'
find . -type f -print0 |xargs -0 grep -Eo 'ssh://-[^ "]+'

Also, some ssh://_ URLs in submodules might still work, because of the URL
rewriting in fdbfb4d1.  But https://-oProxyCommand=pwnme does not really do
anything, unlike ssh://-oProxyCommand=pwnme
This commit is contained in:
Hans-Christoph Steiner 2017-12-04 17:49:59 +01:00
parent 5ae14fab18
commit 7bba20c662
1 changed files with 53 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
fdroidserver/common.py
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@ -787,7 +787,7 @@ class vcs_git(vcs):
def clientversioncmd(self):
return ['git', '--version']
def GitFetchFDroidPopen(self, gitargs, envs=dict(), cwd=None, output=True):
def git(self, args, envs=dict(), cwd=None, output=True):
'''Prevent git fetch/clone/submodule from hanging at the username/password prompt
While fetch/pull/clone respect the command line option flags,
@ -796,8 +796,14 @@ class vcs_git(vcs):
enough. So we just throw the kitchen sink at it to see what
sticks.
Also, because of CVE-2017-1000117, block all SSH URLs.
'''
git_config = []
#
# supported in git >= 2.3
git_config = [
'-c', 'core.sshCommand=false',
'-c', 'url.https://.insteadOf=ssh://',
]
for domain in ('bitbucket.org', 'github.com', 'gitlab.com'):
git_config.append('-c')
git_config.append('url.https://u:p@' + domain + '/.insteadOf=git@' + domain + ':')
@ -805,15 +811,11 @@ class vcs_git(vcs):
git_config.append('url.https://u:p@' + domain + '.insteadOf=git://' + domain)
git_config.append('-c')
git_config.append('url.https://u:p@' + domain + '.insteadOf=https://' + domain)
# add helpful tricks supported in git >= 2.3
ssh_command = 'ssh -oBatchMode=yes -oStrictHostKeyChecking=yes'
git_config.append('-c')
git_config.append('core.sshCommand="' + ssh_command + '"') # git >= 2.10
envs.update({
'GIT_TERMINAL_PROMPT': '0',
'GIT_SSH_COMMAND': ssh_command, # git >= 2.3
'GIT_SSH': 'false', # for git < 2.3
})
return FDroidPopen(['git', ] + git_config + gitargs,
return FDroidPopen(['git', ] + git_config + args,
envs=envs, cwd=cwd, output=output)
def checkrepo(self):
@ -832,7 +834,7 @@ class vcs_git(vcs):
def gotorevisionx(self, rev):
if not os.path.exists(self.local):
# Brand new checkout
p = self.GitFetchFDroidPopen(['clone', self.remote, self.local])
p = self.git(['clone', self.remote, self.local])
if p.returncode != 0:
self.clone_failed = True
raise VCSException("Git clone failed", p.output)
@ -852,10 +854,10 @@ class vcs_git(vcs):
raise VCSException(_("Git clean failed"), p.output)
if not self.refreshed:
# Get latest commits and tags from remote
p = self.GitFetchFDroidPopen(['fetch', 'origin'], cwd=self.local)
p = self.git(['fetch', 'origin'], cwd=self.local)
if p.returncode != 0:
raise VCSException(_("Git fetch failed"), p.output)
p = self.GitFetchFDroidPopen(['fetch', '--prune', '--tags', 'origin'], output=False, cwd=self.local)
p = self.git(['fetch', '--prune', '--tags', 'origin'], output=False, cwd=self.local)
if p.returncode != 0:
raise VCSException(_("Git fetch failed"), p.output)
# Recreate origin/HEAD as git clone would do it, in case it disappeared
@ -898,7 +900,7 @@ class vcs_git(vcs):
p = FDroidPopen(['git', 'submodule', 'sync'], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException(_("Git submodule sync failed"), p.output)
p = self.GitFetchFDroidPopen(['submodule', 'update', '--init', '--force', '--recursive'], cwd=self.local)
p = self.git(['submodule', 'update', '--init', '--force', '--recursive'], cwd=self.local)
if p.returncode != 0:
raise VCSException(_("Git submodule update failed"), p.output)
@ -941,10 +943,23 @@ class vcs_gitsvn(vcs):
if not result.endswith(self.local):
raise VCSException('Repository mismatch')
def git(self, args, envs=dict(), cwd=None, output=True):
'''Prevent git fetch/clone/submodule from hanging at the username/password prompt
'''
# CVE-2017-1000117 block all SSH URLs (supported in git >= 2.3)
config = ['-c', 'core.sshCommand=false']
envs.update({
'GIT_TERMINAL_PROMPT': '0',
'GIT_SSH': 'false', # for git < 2.3
'SVN_SSH': 'false',
})
return FDroidPopen(['git', ] + config + args,
envs=envs, cwd=cwd, output=output)
def gotorevisionx(self, rev):
if not os.path.exists(self.local):
# Brand new checkout
gitsvn_args = ['git', 'svn', 'clone']
gitsvn_args = ['svn', 'clone']
if ';' in self.remote:
remote_split = self.remote.split(';')
for i in remote_split[1:]:
@ -955,13 +970,13 @@ class vcs_gitsvn(vcs):
elif i.startswith('branches='):
gitsvn_args.extend(['-b', i[9:]])
gitsvn_args.extend([remote_split[0], self.local])
p = FDroidPopen(gitsvn_args, output=False)
p = self.git(gitsvn_args, output=False)
if p.returncode != 0:
self.clone_failed = True
raise VCSException("Git svn clone failed", p.output)
else:
gitsvn_args.extend([self.remote, self.local])
p = FDroidPopen(gitsvn_args, output=False)
p = self.git(gitsvn_args, output=False)
if p.returncode != 0:
self.clone_failed = True
raise VCSException("Git svn clone failed", p.output)
@ -969,20 +984,20 @@ class vcs_gitsvn(vcs):
else:
self.checkrepo()
# Discard any working tree changes
p = FDroidPopen(['git', 'reset', '--hard'], cwd=self.local, output=False)
p = self.git(['reset', '--hard'], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException("Git reset failed", p.output)
# Remove untracked files now, in case they're tracked in the target
# revision (it happens!)
p = FDroidPopen(['git', 'clean', '-dffx'], cwd=self.local, output=False)
p = self.git(['clean', '-dffx'], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException("Git clean failed", p.output)
if not self.refreshed:
# Get new commits, branches and tags from repo
p = FDroidPopen(['git', 'svn', 'fetch'], cwd=self.local, output=False)
p = self.git(['svn', 'fetch'], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException("Git svn fetch failed")
p = FDroidPopen(['git', 'svn', 'rebase'], cwd=self.local, output=False)
p = self.git(['svn', 'rebase'], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException("Git svn rebase failed", p.output)
self.refreshed = True
@ -992,7 +1007,7 @@ class vcs_gitsvn(vcs):
nospaces_rev = rev.replace(' ', '%20')
# Try finding a svn tag
for treeish in ['origin/', '']:
p = FDroidPopen(['git', 'checkout', treeish + 'tags/' + nospaces_rev], cwd=self.local, output=False)
p = self.git(['checkout', treeish + 'tags/' + nospaces_rev], cwd=self.local, output=False)
if p.returncode == 0:
break
if p.returncode != 0:
@ -1013,7 +1028,7 @@ class vcs_gitsvn(vcs):
svn_rev = svn_rev if svn_rev[0] == 'r' else 'r' + svn_rev
p = FDroidPopen(['git', 'svn', 'find-rev', '--before', svn_rev, treeish], cwd=self.local, output=False)
p = self.git(['svn', 'find-rev', '--before', svn_rev, treeish], cwd=self.local, output=False)
git_rev = p.output.rstrip()
if p.returncode == 0 and git_rev:
@ -1021,17 +1036,17 @@ class vcs_gitsvn(vcs):
if p.returncode != 0 or not git_rev:
# Try a plain git checkout as a last resort
p = FDroidPopen(['git', 'checkout', rev], cwd=self.local, output=False)
p = self.git(['checkout', rev], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException("No git treeish found and direct git checkout of '%s' failed" % rev, p.output)
else:
# Check out the git rev equivalent to the svn rev
p = FDroidPopen(['git', 'checkout', git_rev], cwd=self.local, output=False)
p = self.git(['checkout', git_rev], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException(_("Git checkout of '%s' failed") % rev, p.output)
# Get rid of any uncontrolled files left behind
p = FDroidPopen(['git', 'clean', '-dffx'], cwd=self.local, output=False)
p = self.git(['clean', '-dffx'], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException(_("Git clean failed"), p.output)
@ -1060,7 +1075,7 @@ class vcs_hg(vcs):
def gotorevisionx(self, rev):
if not os.path.exists(self.local):
p = FDroidPopen(['hg', 'clone', self.remote, self.local], output=False)
p = FDroidPopen(['hg', 'clone', '--ssh', 'false', self.remote, self.local], output=False)
if p.returncode != 0:
self.clone_failed = True
raise VCSException("Hg clone failed", p.output)
@ -1073,7 +1088,7 @@ class vcs_hg(vcs):
raise VCSException("Unexpected output from hg status -uS: " + line)
FDroidPopen(['rm', '-rf', line[2:]], cwd=self.local, output=False)
if not self.refreshed:
p = FDroidPopen(['hg', 'pull'], cwd=self.local, output=False)
p = FDroidPopen(['hg', 'pull'], '--ssh', 'false', cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException("Hg pull failed", p.output)
self.refreshed = True
@ -1108,29 +1123,36 @@ class vcs_bzr(vcs):
def clientversioncmd(self):
return ['bzr', '--version']
def bzr(self, args, envs=dict(), cwd=None, output=True):
'''Prevent bzr from ever using SSH to avoid security vulns'''
envs.update({
'BZR_SSH': 'false',
})
return FDroidPopen(['bzr', ] + args, envs=envs, cwd=cwd, output=output)
def gotorevisionx(self, rev):
if not os.path.exists(self.local):
p = FDroidPopen(['bzr', 'branch', self.remote, self.local], output=False)
p = self.bzr(['branch', self.remote, self.local], output=False)
if p.returncode != 0:
self.clone_failed = True
raise VCSException("Bzr branch failed", p.output)
else:
p = FDroidPopen(['bzr', 'clean-tree', '--force', '--unknown', '--ignored'], cwd=self.local, output=False)
p = self.bzr(['clean-tree', '--force', '--unknown', '--ignored'], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException("Bzr revert failed", p.output)
if not self.refreshed:
p = FDroidPopen(['bzr', 'pull'], cwd=self.local, output=False)
p = self.bzr(['pull'], cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException("Bzr update failed", p.output)
self.refreshed = True
revargs = list(['-r', rev] if rev else [])
p = FDroidPopen(['bzr', 'revert'] + revargs, cwd=self.local, output=False)
p = self.bzr(['revert'] + revargs, cwd=self.local, output=False)
if p.returncode != 0:
raise VCSException("Bzr revert of '%s' failed" % rev, p.output)
def _gettags(self):
p = FDroidPopen(['bzr', 'tags'], cwd=self.local, output=False)
p = self.bzr(['tags'], cwd=self.local, output=False)
return [tag.split(' ')[0].strip() for tag in
p.output.splitlines()]