src/do-refresh-auth
author Paul Crowley <paul@lshift.net>
Fri, 20 Feb 2009 15:33:49 +0000
changeset 56 9ea9a30cd060
parent 50 77d97aa18f29
child 62 f1e319d3672a
permissions -rwxr-xr-x
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#!/usr/bin/env python
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# Copyright 2008-2009 LShift Ltd
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# WARNING
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# This script completely destroys your ~/.ssh/authorized_keys
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# file every time it is run
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# WARNING
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import sys
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import os
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import os.path
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import ruleset
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import subprocess
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if len(sys.argv) <= 3:
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    sys.stderr.write("refresh-auth: wrong number of arguments (%s)\n" % sys.argv)
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    sys.exit(-1)
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akeyfile = sys.argv[1]
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wrappercommand = sys.argv[2]
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prefix='no-pty,no-port-forwarding,no-X11-forwarding,no-agent-forwarding,command='
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if os.path.exists(akeyfile):
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    f = open(akeyfile)
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    try:
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        for l in f:
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            if not l.startswith(prefix):
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                raise Exception("Safety check failed, delete %s to continue" % akeyfile)
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    finally:
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        f.close()
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akeys = open(akeyfile + "_new", "w")
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for keyroot in sys.argv[3:]:
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    kr = keyroot + "/"
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    #print "Processing keyroot", keyroot
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    for root, dirs, files in os.walk(keyroot):
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        for fn in files:
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            ffn = os.path.join(root, fn)
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            if not ffn.startswith(kr):
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                raise Exception("Inconsistent behaviour in os.walk, bailing")
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            #print "Processing file", ffn
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            keyname = ffn[len(kr):]
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            if not ruleset.goodpath(keyname):
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                # ignore any path that contains dodgy characters
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                #print "Ignoring file", ffn
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                continue
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            p = subprocess.Popen(("ssh-keygen", "-i", "-f", ffn), 
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                stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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            newkey = p.communicate()[0]
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            if p.wait() == 0:
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                klines = [l.strip() for l in newkey.split("\n")]
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            else:
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                # Conversion failed, read it directly.
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                kf = open(ffn)
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                try:
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                    klines = [l.strip() for l in kf]
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                finally:
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                    kf.close()
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            for l in klines:
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                if len(l):
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                    akeys.write('%s"%s %s" %s\n' % (prefix, wrappercommand, keyname, l))
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akeys.close()
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os.rename(akeyfile + "_new", akeyfile)
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