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'''All POSIX Type client support for Bcfg2'''
__revision__ = '$Revision$'
from stat import S_ISVTX, S_ISGID, S_ISUID, S_IXUSR, S_IWUSR, S_IRUSR, S_IXGRP
from stat import S_IWGRP, S_IRGRP, S_IXOTH, S_IWOTH, S_IROTH, ST_MODE, S_ISDIR
from stat import S_IFREG, ST_UID, ST_GID, S_ISREG, S_IFDIR, S_ISLNK
import binascii, difflib, grp, os, pwd, xml.sax.saxutils
import Bcfg2.Client.Tools
def calcPerms(initial, perms):
'''This compares ondisk permissions with specified ones'''
pdisp = [{1:S_ISVTX, 2:S_ISGID, 4:S_ISUID}, {1:S_IXUSR, 2:S_IWUSR, 4:S_IRUSR},
{1:S_IXGRP, 2:S_IWGRP, 4:S_IRGRP}, {1:S_IXOTH, 2:S_IWOTH, 4:S_IROTH}]
tempperms = initial
if len(perms) == 3:
perms = '0%s' % (perms)
pdigits = [int(perms[digit]) for digit in range(4)]
for index in range(4):
for (num, perm) in pdisp[index].iteritems():
if pdigits[index] & num:
tempperms |= perm
return tempperms
class POSIX(Bcfg2.Client.Tools.Tool):
'''POSIX File support code'''
__name__ = 'POSIX'
__handles__ = [('ConfigFile', None), ('Directory', None), ('Permissions', None), \
('SymLink', None)]
__req__ = {'ConfigFile': ['name', 'owner', 'group', 'perms'],
'Directory': ['name', 'owner', 'group', 'perms'],
'Permissions': ['name', 'owner', 'group', 'perms'],
'SymLink': ['name', 'to']}
def canInstall(self, entry):
'''Check if entry is complete for installation'''
if Bcfg2.Client.Tools.Tool.canInstall(self, entry):
if (entry.tag, entry.text, entry.get('empty', 'false')) == \
('ConfigFile', None, 'false'):
return False
return True
else:
return False
def VerifySymLink(self, entry, _):
'''Verify SymLink Entry'''
try:
sloc = os.readlink(entry.get('name'))
if sloc == entry.get('to'):
return True
self.logger.debug("Symlink %s points to %s, should be %s" % \
(entry.get('name'), sloc, entry.get('to')))
entry.set('current_to', sloc)
return False
except OSError:
entry.set('current_exists', 'false')
return False
def InstallSymLink(self, entry):
'''Install SymLink Entry'''
self.logger.info("Installing Symlink %s" % (entry.get('name')))
try:
fmode = os.lstat(entry.get('name'))[ST_MODE]
if S_ISREG(fmode) or S_ISLNK(fmode):
self.logger.debug("Non-directory entry already exists at %s" % \
(entry.get('name')))
os.unlink(entry.get('name'))
elif S_ISDIR(fmode):
self.logger.debug("Directory entry already exists at %s" % (entry.get('name')))
self.cmd.run("mv %s/ %s.bak" % (entry.get('name'), entry.get('name')))
else:
os.unlink(entry.get('name'))
except OSError:
self.logger.info("Symlink %s cleanup failed" % (entry.get('name')))
try:
os.symlink(entry.get('to'), entry.get('name'))
return True
except OSError:
return False
def VerifyDirectory(self, entry, _):
'''Verify Directory Entry'''
while len(entry.get('perms', '')) < 4:
entry.set('perms', '0' + entry.get('perms', ''))
try:
ondisk = os.stat(entry.get('name'))
except OSError:
entry.set('current_exists', 'false')
self.logger.debug("%s %s does not exist" %
(entry.tag, entry.get('name')))
return False
try:
owner = pwd.getpwuid(ondisk[ST_UID])[0]
group = grp.getgrgid(ondisk[ST_GID])[0]
except (OSError, KeyError):
self.logger.error('User/Group resolution failed for path %s' % (entry.get('name')))
owner = 'root'
group = 'root'
perms = oct(os.stat(entry.get('name'))[ST_MODE])[-4:]
if ((owner == entry.get('owner')) and
(group == entry.get('group')) and
(perms == entry.get('perms'))):
return True
else:
if owner != entry.get('owner'):
entry.set('current_owner', owner)
self.logger.debug("%s %s ownership wrong" % (entry.tag, entry.get('name')))
if group != entry.get('group'):
entry.set('current_group', group)
self.logger.debug("%s %s group wrong" % (entry.tag, entry.get('name')))
if perms != entry.get('perms'):
entry.set('current_perms', perms)
self.logger.debug("%s %s permissions wrong: are %s should be %s" %
(entry.tag, entry.get('name'), perms, entry.get('perms')))
return False
def InstallDirectory(self, entry):
'''Install Directory Entry'''
self.logger.info("Installing Directory %s" % (entry.get('name')))
try:
fmode = os.lstat(entry.get('name'))
if not S_ISDIR(fmode[ST_MODE]):
self.logger.debug("Found a non-directory entry at %s" % (entry.get('name')))
try:
os.unlink(entry.get('name'))
except OSError:
self.logger.info("Failed to unlink %s" % (entry.get('name')))
return False
else:
self.logger.debug("Found a pre-existing directory at %s" % (entry.get('name')))
exists = True
except OSError:
# stat failed
exists = False
if not exists:
parent = "/".join(entry.get('name').split('/')[:-1])
if parent:
try:
os.lstat(parent)
except:
self.logger.debug('Creating parent path for directory %s' % (entry.get('name')))
for idx in xrange(len(parent.split('/')[:-1])):
current = '/'+'/'.join(parent.split('/')[1:2+idx])
try:
sloc = os.lstat(current)
try:
if not S_ISDIR(sloc[ST_MODE]):
os.unlink(current)
os.mkdir(current)
except OSError:
return False
except OSError:
try:
os.mkdir(current)
except OSError:
return False
try:
os.mkdir(entry.get('name'))
except OSError:
self.logger.error('Failed to create directory %s' % (entry.get('name')))
return False
return self.InstallPermissions(entry)
def VerifyPermissions(self, entry, _):
'''Verify Permissions entry'''
return self.VerifyDirectory(entry, _)
def InstallPermissions(self, entry):
'''Install POSIX Permissions'''
try:
os.chown(entry.get('name'),
pwd.getpwnam(entry.get('owner'))[2], grp.getgrnam(entry.get('group'))[2])
os.chmod(entry.get('name'), calcPerms(S_IFDIR, entry.get('perms')))
return True
except (OSError, KeyError):
self.logger.error('Permission fixup failed for %s' % (entry.get('name')))
return False
def VerifyConfigFile(self, entry, _):
'''Install ConfigFile Entry'''
# configfile verify is permissions check + content check
permissionStatus = self.VerifyDirectory(entry, _)
if entry.get('encoding', 'ascii') == 'base64':
tempdata = binascii.a2b_base64(entry.text)
elif entry.get('empty', 'false') == 'true':
tempdata = ''
else:
if entry.text == None:
self.logger.error("Cannot verify incomplete ConfigFile %s" % (entry.get('name')))
return False
tempdata = entry.text
try:
content = open(entry.get('name')).read()
except IOError:
# file does not exist
return False
contentStatus = content == tempdata
if not contentStatus:
diff = '\n'.join([x for x in difflib.ndiff(content.split('\n'), tempdata.split('\n'))])
try:
entry.set("current_diff", xml.sax.saxutils.quoteattr(diff))
except:
pass
return contentStatus and permissionStatus
def InstallConfigFile(self, entry):
'''Install ConfigFile Entry'''
self.logger.info("Installing ConfigFile %s" % (entry.get('name')))
parent = "/".join(entry.get('name').split('/')[:-1])
if parent:
try:
os.lstat(parent)
except:
self.logger.debug('Creating parent path for config file %s' % (entry.get('name')))
for idx in xrange(len(parent.split('/')[:-1])):
current = '/'+'/'.join(parent.split('/')[1:2+idx])
try:
sloc = os.lstat(current)
try:
if not S_ISDIR(sloc[ST_MODE]):
os.unlink(current)
os.mkdir(current)
except OSError:
return False
except OSError:
try:
os.mkdir(current)
except OSError:
return False
# If we get here, then the parent directory should exist
try:
newfile = open("%s.new"%(entry.get('name')), 'w')
if entry.get('encoding', 'ascii') == 'base64':
filedata = binascii.a2b_base64(entry.text)
elif entry.get('empty', 'false') == 'true':
filedata = ''
else:
filedata = entry.text
newfile.write(filedata)
newfile.close()
try:
os.chown(newfile.name, pwd.getpwnam(entry.get('owner'))[2],
grp.getgrnam(entry.get('group'))[2])
except KeyError:
os.chown(newfile.name, 0, 0)
os.chmod(newfile.name, calcPerms(S_IFREG, entry.get('perms')))
if entry.get("paranoid", False) and self.setup.get("paranoid", False):
self.cmd.run("cp %s /var/cache/bcfg2/%s" % (entry.get('name')))
os.rename(newfile.name, entry.get('name'))
return True
except (OSError, IOError), err:
if err.errno == 13:
self.logger.info("Failed to open %s for writing" % (entry.get('name')))
else:
print err
return False
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