Make warning message more specific.
This commit is contained in:
Gregor Robinson
parent
db3120f655
commit
1ed34b0084
136
src/shared.py
136
src/shared.py
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@ -202,31 +202,36 @@ def reloadMyAddressHashes():
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hasEnabledKeys = False
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for addressInKeysFile in configSections:
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if addressInKeysFile <> 'bitmessagesettings':
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hasEnabledKeys = True
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isEnabled = config.getboolean(addressInKeysFile, 'enabled')
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if isEnabled:
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if keyfileSecure:
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status,addressVersionNumber,streamNumber,hash = decodeAddress(addressInKeysFile)
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if addressVersionNumber == 2 or addressVersionNumber == 3:
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# Returns a simple 32 bytes of information encoded in 64 Hex characters, or null if there was an error.
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privEncryptionKey = decodeWalletImportFormat(
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config.get(addressInKeysFile, 'privencryptionkey')).encode('hex')
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hasEnabledKeys = True
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status,addressVersionNumber,streamNumber,hash = decodeAddress(addressInKeysFile)
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if addressVersionNumber == 2 or addressVersionNumber == 3:
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# Returns a simple 32 bytes of information encoded in 64 Hex characters,
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# or null if there was an error.
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privEncryptionKey = decodeWalletImportFormat(
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config.get(addressInKeysFile, 'privencryptionkey')).encode('hex')
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if len(privEncryptionKey) == 64:#It is 32 bytes encoded as 64 hex characters
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myECCryptorObjects[hash] = highlevelcrypto.makeCryptor(privEncryptionKey)
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myAddressesByHash[hash] = addressInKeysFile
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else:
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sys.stderr.write('Error in reloadMyAddressHashes: Can\'t handle address versions other than 2 or 3.\n')
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if len(privEncryptionKey) == 64:#It is 32 bytes encoded as 64 hex characters
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myECCryptorObjects[hash] = highlevelcrypto.makeCryptor(privEncryptionKey)
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myAddressesByHash[hash] = addressInKeysFile
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if not keyfileSecure:
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# Insecure keyfile permissions. Disable key.
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config.set(addressInKeysFile, 'enabled', 'false')
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else:
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# Insecure keyfile permissions. Disable key.
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config.set(addressInKeysFile, 'enabled', 'false')
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try:
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if not keyfileSecure:
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with open(appdata + 'keys.dat', 'wb') as keyfile:
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config.write(keyfile)
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except:
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print 'Failed to disable vulnerable keyfiles.'
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raise
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sys.stderr.write('Error in reloadMyAddressHashes: Can\'t handle address '
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'versions other than 2 or 3.\n')
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if not keyfileSecure:
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fixSensitiveFilePermissions(appdata + 'keys.dat', hasEnabledKeys)
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if hasEnabledKeys:
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try:
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with open(appdata + 'keys.dat', 'wb') as keyfile:
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config.write(keyfile)
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except:
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print 'Failed to disable vulnerable keys.'
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raise
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def reloadBroadcastSendersForWhichImWatching():
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printLock.acquire()
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@ -318,53 +323,58 @@ def fixPotentiallyInvalidUTF8Data(text):
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output = 'Part of the message is corrupt. The message cannot be displayed the normal way.\n\n' + repr(text)
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return output
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# Checks sensitive file permissions for inappropriate umask during keys.dat creation.
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# (Or unwise subsequent chmod.)
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# Returns true iff file appears to have appropriate permissions.
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def checkSensitiveFilePermissions(filename):
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if sys.platform == 'win32':
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# TODO: This might deserve extra checks by someone familiar with
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# Windows systems.
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fileSecure = True
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return True
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else:
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fileSecure = secureFilePermissions(filename)
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if not fileSecure:
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print
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print '******************************************************************'
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print '** !! WARNING !! **'
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print '******************************************************************'
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print '** Possibly major security problem: **'
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print '** Your keyfiles were vulnerable to being read by other users **'
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print '** (including some untrusted daemons). You may wish to consider **'
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print '** generating new keys and discontinuing use of your old ones. **'
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print '** Your private keys have been disabled for your security, but **'
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print '** you may re-enable them using the "Your Identities" tab in **'
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print '** the default GUI or by modifying keys.dat such that your keys **'
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print '** show "enabled = true". **'
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try:
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fixSensitiveFilePermissions(filename)
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print '** The problem has been automatically fixed. **'
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print '******************************************************************'
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print
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except Exception, e:
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print '** Could NOT automatically fix permissions. **'
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print '******************************************************************'
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print
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raise
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return fileSecure
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# Checks sensitive file permissions for inappropriate umask during keys.dat creation.
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# (Or unwise subsequent chmod.)
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# Returns true iff file appears to have appropriate permissions.
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def secureFilePermissions(filename):
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present_permissions = os.stat(filename)[0]
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disallowed_permissions = stat.S_IRWXG | stat.S_IRWXO
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return present_permissions & disallowed_permissions == 0
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present_permissions = os.stat(filename)[0]
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disallowed_permissions = stat.S_IRWXG | stat.S_IRWXO
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return present_permissions & disallowed_permissions == 0
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# Fixes permissions on a sensitive file.
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def fixSensitiveFilePermissions(filename):
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present_permissions = os.stat(filename)[0]
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disallowed_permissions = stat.S_IRWXG | stat.S_IRWXO
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allowed_permissions = ((1<<32)-1) ^ disallowed_permissions
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new_permissions = (
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allowed_permissions & present_permissions)
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os.chmod(filename, new_permissions)
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def fixSensitiveFilePermissions(filename, hasEnabledKeys):
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if hasEnabledKeys:
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print
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print '******************************************************************'
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print '** !! WARNING !! **'
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print '******************************************************************'
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print '** Possibly major security problem: **'
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print '** Your keyfile was vulnerable to being read by other users **'
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print '** (including some untrusted daemons). You may wish to consider **'
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print '** generating new keys and discontinuing use of your old ones. **'
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print '** Your private keys have been disabled for your security, but **'
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print '** you may re-enable them using the "Your Identities" tab in **'
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print '** the default GUI or by modifying keys.dat such that your keys **'
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print '** show "enabled = true". **'
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else:
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print '******************************************************************'
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print '** !! WARNING !! **'
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print '******************************************************************'
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print '** Possibly major security problem: **'
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print '** Your keyfile was vulnerable to being read by other users. **'
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print '** Fortunately, you don\'t have any enabled keys, but be aware **'
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print '** that any disabled keys may have been compromised by malware **'
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print '** running by other users and that you should reboot before **'
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print '** generating any new keys. **'
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try:
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present_permissions = os.stat(filename)[0]
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disallowed_permissions = stat.S_IRWXG | stat.S_IRWXO
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allowed_permissions = ((1<<32)-1) ^ disallowed_permissions
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new_permissions = (
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allowed_permissions & present_permissions)
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os.chmod(filename, new_permissions)
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print '** The file permissions have been automatically fixed. **'
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print '******************************************************************'
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print
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except Exception, e:
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print '** Could NOT automatically fix permissions. **'
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print '******************************************************************'
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print
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raise
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