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# GnuPG signing extension for Mercurial
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#
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# Copyright 2005, 2006 Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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import os, tempfile, binascii
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from mercurial import util
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from mercurial import node as hgnode
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from mercurial.i18n import gettext as _
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class gpg:
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def __init__(self, path, key=None):
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self.path = path
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self.key = (key and " --local-user \"%s\"" % key) or ""
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def sign(self, data):
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gpgcmd = "%s --sign --detach-sign%s" % (self.path, self.key)
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return util.filter(data, gpgcmd)
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def verify(self, data, sig):
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""" returns of the good and bad signatures"""
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try:
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# create temporary files
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fd, sigfile = tempfile.mkstemp(prefix="hggpgsig")
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fp = os.fdopen(fd, 'wb')
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fp.write(sig)
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fp.close()
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fd, datafile = tempfile.mkstemp(prefix="hggpgdata")
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fp = os.fdopen(fd, 'wb')
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fp.write(data)
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fp.close()
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gpgcmd = ("%s --logger-fd 1 --status-fd 1 --verify "
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"\"%s\" \"%s\"" % (self.path, sigfile, datafile))
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ret = util.filter("", gpgcmd)
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except:
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for f in (sigfile, datafile):
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try:
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if f: os.unlink(f)
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except: pass
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raise
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keys = []
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key, fingerprint = None, None
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err = ""
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for l in ret.splitlines():
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# see DETAILS in the gnupg documentation
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# filter the logger output
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if not l.startswith("[GNUPG:]"):
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continue
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l = l[9:]
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if l.startswith("ERRSIG"):
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err = _("error while verifying signature")
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break
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elif l.startswith("VALIDSIG"):
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# fingerprint of the primary key
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fingerprint = l.split()[10]
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elif (l.startswith("GOODSIG") or
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l.startswith("EXPSIG") or
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l.startswith("EXPKEYSIG") or
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l.startswith("BADSIG")):
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if key is not None:
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keys.append(key + [fingerprint])
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key = l.split(" ", 2)
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fingerprint = None
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if err:
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return err, []
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if key is not None:
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keys.append(key + [fingerprint])
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return err, keys
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def newgpg(ui, **opts):
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"""create a new gpg instance"""
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gpgpath = ui.config("gpg", "cmd", "gpg")
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gpgkey = opts.get('key')
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if not gpgkey:
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gpgkey = ui.config("gpg", "key", None)
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return gpg(gpgpath, gpgkey)
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def sigwalk(repo):
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"""
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walk over every sigs, yields a couple
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((node, version, sig), (filename, linenumber))
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"""
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def parsefile(fileiter, context):
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ln = 1
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for l in fileiter:
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if not l:
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continue
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yield (l.split(" ", 2), (context, ln))
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ln +=1
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fl = repo.file(".hgsigs")
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h = fl.heads()
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h.reverse()
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# read the heads
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for r in h:
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fn = ".hgsigs|%s" % hgnode.short(r)
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for item in parsefile(fl.read(r).splitlines(), fn):
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yield item
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try:
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# read local signatures
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fn = "localsigs"
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for item in parsefile(repo.opener(fn), fn):
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yield item
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except IOError:
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pass
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def getkeys(ui, repo, mygpg, sigdata, context):
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"""get the keys who signed a data"""
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fn, ln = context
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node, version, sig = sigdata
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prefix = "%s:%d" % (fn, ln)
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node = hgnode.bin(node)
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data = node2txt(repo, node, version)
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sig = binascii.a2b_base64(sig)
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err, keys = mygpg.verify(data, sig)
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if err:
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ui.warn("%s:%d %s\n" % (fn, ln , err))
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return None
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validkeys = []
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# warn for expired key and/or sigs
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for key in keys:
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if key[0] == "BADSIG":
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ui.write(_("%s Bad signature from \"%s\"\n") % (prefix, key[2]))
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continue
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if key[0] == "EXPSIG":
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ui.write(_("%s Note: Signature has expired"
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" (signed by: \"%s\")\n") % (prefix, key[2]))
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elif key[0] == "EXPKEYSIG":
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ui.write(_("%s Note: This key has expired"
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" (signed by: \"%s\")\n") % (prefix, key[2]))
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validkeys.append((key[1], key[2], key[3]))
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return validkeys
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def sigs(ui, repo):
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"""list signed changesets"""
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mygpg = newgpg(ui)
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revs = {}
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for data, context in sigwalk(repo):
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node, version, sig = data
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fn, ln = context
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try:
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n = repo.lookup(node)
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except KeyError:
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ui.warn(_("%s:%d node does not exist\n") % (fn, ln))
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continue
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r = repo.changelog.rev(n)
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keys = getkeys(ui, repo, mygpg, data, context)
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if not keys:
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continue
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revs.setdefault(r, [])
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revs[r].extend(keys)
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nodes = list(revs)
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nodes.reverse()
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for rev in nodes:
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for k in revs[rev]:
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r = "%5d:%s" % (rev, hgnode.hex(repo.changelog.node(rev)))
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ui.write("%-30s %s\n" % (keystr(ui, k), r))
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def check(ui, repo, rev):
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"""verify all the signatures there may be for a particular revision"""
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mygpg = newgpg(ui)
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rev = repo.lookup(rev)
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hexrev = hgnode.hex(rev)
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keys = []
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for data, context in sigwalk(repo):
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node, version, sig = data
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if node == hexrev:
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k = getkeys(ui, repo, mygpg, data, context)
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if k:
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keys.extend(k)
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if not keys:
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ui.write(_("No valid signature for %s\n") % hgnode.short(rev))
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return
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# print summary
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ui.write("%s is signed by:\n" % hgnode.short(rev))
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for key in keys:
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ui.write(" %s\n" % keystr(ui, key))
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def keystr(ui, key):
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"""associate a string to a key (username, comment)"""
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keyid, user, fingerprint = key
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comment = ui.config("gpg", fingerprint, None)
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if comment:
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return "%s (%s)" % (user, comment)
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else:
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return user
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def sign(ui, repo, *revs, **opts):
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"""add a signature for the current tip or a given revision"""
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mygpg = newgpg(ui, **opts)
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sigver = "0"
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sigmessage = ""
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if revs:
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nodes = [repo.lookup(n) for n in revs]
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else:
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nodes = [repo.changelog.tip()]
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for n in nodes:
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hexnode = hgnode.hex(n)
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ui.write("Signing %d:%s\n" % (repo.changelog.rev(n),
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hgnode.short(n)))
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# build data
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data = node2txt(repo, n, sigver)
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sig = mygpg.sign(data)
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if not sig:
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raise util.Abort(_("Error while signing"))
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sig = binascii.b2a_base64(sig)
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sig = sig.replace("\n", "")
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sigmessage += "%s %s %s\n" % (hexnode, sigver, sig)
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# write it
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if opts['local']:
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repo.opener("localsigs", "ab").write(sigmessage)
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return
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for x in repo.changes():
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if ".hgsigs" in x and not opts["force"]:
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raise util.Abort(_("working copy of .hgsigs is changed "
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"(please commit .hgsigs manually "
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"or use --force)"))
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repo.wfile(".hgsigs", "ab").write(sigmessage)
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if repo.dirstate.state(".hgsigs") == '?':
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repo.add([".hgsigs"])
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if opts["no_commit"]:
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return
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message = opts['message']
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if not message:
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message = "\n".join([_("Added signature for changeset %s")
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% hgnode.hex(n)
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for n in nodes])
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try:
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repo.commit([".hgsigs"], message, opts['user'], opts['date'])
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except ValueError, inst:
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raise util.Abort(str(inst))
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def node2txt(repo, node, ver):
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"""map a manifest into some text"""
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if ver == "0":
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return "%s\n" % hgnode.hex(node)
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else:
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raise util.Abort(_("unknown signature version"))
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cmdtable = {
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"sign":
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(sign,
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[('l', 'local', None, _("make the signature local")),
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('f', 'force', None, _("sign even if the sigfile is modified")),
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('', 'no-commit', None, _("do not commit the sigfile after signing")),
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('m', 'message', "", _("commit message")),
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('d', 'date', "", _("date code")),
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('u', 'user', "", _("user")),
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('k', 'key', "", _("the key id to sign with"))],
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_("hg sign [OPTION]... [REVISION]...")),
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"sigcheck": (check, [], _('hg sigcheck REVISION')),
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"sigs": (sigs, [], _('hg sigs')),
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}
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