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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, ST_MTIME
import binascii, difflib, grp, os, pwd, string, logging, time
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
log = logging.getLogger('posix')
def normUid(entry):
'''This takes a user name or uid and returns the corrisponding uid or False'''
try:
try:
return int(entry.get('owner'))
except:
return int(pwd.getpwnam(entry.get('owner'))[2])
except (OSError, KeyError):
log.error('UID normalization failed for %s' % (entry.get('name')))
return False
def normGid(entry):
'''This takes a group name or gid and returns the corrisponding gid or False'''
try:
try:
return int(entry.get('group'))
except:
return int(grp.getgrnam(entry.get('group'))[2])
except (OSError, KeyError):
log.error('GID normalization failed for %s' % (entry.get('name')))
return False
text_chars = "".join([chr(y) for y in range(32, 127)] + list("\n\r\t\b"))
notrans = string.maketrans("", "")
def isString(strng):
'''Returns true if a string contains no binary chars'''
if "\0" in strng:
return False
if not strng:
return True
return len(strng.translate(notrans, text_chars)) == 0
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)
entry.set('qtext', "Link %s to %s? [y/N] " % (entry.get('name'),
entry.get('to')))
return False
except OSError:
entry.set('current_exists', 'false')
entry.set('qtext', "Link %s to %s? [y/N] " % (entry.get('name'),
entry.get('to')))
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, modlist):
'''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 = str(ondisk[ST_UID])
group = str(ondisk[ST_GID])
except (OSError, KeyError):
self.logger.error('User/Group resolution failed for path %s' % (entry.get('name')))
owner = 'root'
group = '0'
finfo = os.stat(entry.get('name'))
perms = oct(finfo[ST_MODE])[-4:]
if entry.get('mtime', '-1') != '-1':
mtime = str(finfo[ST_MTIME])
else:
mtime = '-1'
pTrue = ((owner == str(normUid(entry))) and
(group == str(normGid(entry))) and
(perms == entry.get('perms')) and
(mtime == entry.get('mtime', '-1')))
pruneTrue = True
ex_ents = []
if entry.get('prune', 'false') == 'true' \
and entry.tag == 'Directory':
try:
entries = ['/'.join([entry.get('name'), ent]) \
for ent in os.listdir(entry.get('name'))]
ex_ents = [e for e in entries if e not in modlist]
if ex_ents:
pruneTrue = False
self.logger.debug("Directory %s contains extra entries:" % entry.get('name'))
self.logger.debug(ex_ents)
nqtext = entry.get('qtext', '') + '\n'
nqtext += "Directory %s contains extra entries:" % entry.get('name')
nqtext += ":".join(ex_ents)
entry.set('qtest', nqtext)
except OSError:
ex_ents = []
pruneTrue = True
if not pTrue:
if owner != str(normUid(entry)):
entry.set('current_owner', owner)
self.logger.debug("%s %s ownership wrong" % (entry.tag, entry.get('name')))
nqtext = entry.get('qtext', '') + '\n'
nqtext += "%s owner wrong. is %s should be %s" % \
(entry.get('name'), owner, entry.get('owner'))
entry.set('qtext', nqtext)
if group != str(normGid(entry)):
entry.set('current_group', group)
self.logger.debug("%s %s group wrong" % (entry.tag, entry.get('name')))
nqtext = entry.get('qtext', '') + '\n'
nqtext += "%s group is %s should be %s" % \
(entry.get('name'), group, entry.get('group'))
entry.set('qtext', nqtext)
if perms != entry.get('perms'):
entry.set('current_perms', perms)
self.logger.debug("%s %s permissions are %s should be %s" %
(entry.tag, entry.get('name'), perms, entry.get('perms')))
nqtext = entry.get('qtext', '') + '\n'
nqtext += "%s perms are %s should be %s" % \
(entry.get('name'), perms, entry.get('perms'))
entry.set('qtext', nqtext)
if mtime != entry.get('mtime', '-1'):
entry.set('current_mtime', mtime)
self.logger.debug("%s %s mtime is %s should be %s" \
% (entry.tag, entry.get('name'), mtime,
entry.get('mtime')))
nqtext = entry.get('qtext', '') + '\n'
nqtext += "%s mtime is %s should be %s" % \
(entry.get('name'), mtime, entry.get('mtime'))
entry.set('qtext', nqtext)
if entry.tag != 'ConfigFile':
nnqtext = entry.get('qtext')
nnqtext += '\nInstall %s %s: (y/N) ' % (entry.tag, entry.get('name'))
entry.set('qtext', nnqtext)
return pTrue and pruneTrue
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'))
exists = False
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.stat(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.stat(current)
except OSError:
try:
os.mkdir(current)
continue
except OSError:
return False
if not S_ISDIR(sloc[ST_MODE]):
try:
os.unlink(current)
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
if entry.get('prune', 'false') == 'true' and entry.get("qtest"):
for pname in entry.get("qtest").split(":"):
ulfailed = False
try:
self.logger.debug("Unlinking file %s" % pname)
os.unlink(pname)
except OSError:
self.logger.error("Failed to unlink path %s" % pname)
ulfailed = True
if ulfailed:
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'), normUid(entry), normGid(entry))
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 gatherCurrentData(self, entry):
if entry.tag == 'ConfigFile':
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:
entry.set('current_owner', str(ondisk[ST_UID]))
entry.set('current_group', str(ondisk[ST_GID]))
except (OSError, KeyError):
pass
entry.set('perms', str(oct(ondisk[ST_MODE])[-4:]))
try:
content = open(entry.get('name')).read()
entry.set('current_bfile', binascii.b2a_base64(content))
except IOError, error:
self.logger.error("Failed to read %s: %s" % (error.filename, error.strerror))
def VerifyConfigFile(self, entry, _):
'''Install ConfigFile Entry'''
# configfile verify is permissions check + content check
permissionStatus = self.VerifyDirectory(entry, _)
tbin = False
if entry.get('encoding', 'ascii') == 'base64':
tempdata = binascii.a2b_base64(entry.text)
tbin = True
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
if type(tempdata) == unicode:
tempdata = tempdata.encode(self.setup['encoding'])
try:
content = open(entry.get('name')).read()
except IOError, error:
self.logger.error("Failed to read %s: %s" % (error.filename, error.strerror))
return False
# comparaison should be done with figerprints or md5sum so it would be faster
# for big binary files
contentStatus = content == tempdata
if not contentStatus:
if tbin or not isString(content):
entry.set('current_bfile', binascii.b2a_base64(content))
nqtext = entry.get('qtext', '')
nqtext += '\nBinary file, no printable diff'
else:
do_diff = True
rawdiff = []
start = time.time()
longtime = False
for x in difflib.ndiff(content.split('\n'), tempdata.split('\n')):
now = time.time()
rawdiff.append(x)
if now - start > 5 and not longtime:
self.logger.info("Diff of %s taking a long time" % (entry.get('name')))
longtime = True
elif now - start > 30:
self.logger.error("Diff of %s took too long; giving up" % (entry.get('name')))
do_diff = False
break
if do_diff:
diff = '\n'.join(rawdiff)
entry.set("current_bdiff", binascii.b2a_base64(diff))
# entry.set("current_diff", diff)
udiff = '\n'.join([x for x in \
difflib.unified_diff(content.split('\n'), \
tempdata.split('\n'))])
try:
eudiff = udiff.encode('ascii')
except:
eudiff = "Binary file: no diff printed"
nqtext = entry.get('qtext', '')
if nqtext:
nqtext += '\n'
nqtext += eudiff
else:
entry.set('current_bfile', binascii.b2a_base64(content))
nqtext = entry.get('qtext', '')
nqtext += '\nDiff took too long to compute, no printable diff'
entry.set('qtext', nqtext)
qtxt = entry.get('qtext', '')
qtxt += "\nInstall ConfigFile %s: (y/N): " % (entry.get('name'))
entry.set('qtext', qtxt)
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.stat(parent)
except:
self.logger.debug('Creating parent path for config file %s' % \
(entry.get('name')))
current = '/'
for next in parent.split('/')[1:]:
current += next + '/'
try:
sloc = os.stat(current)
try:
if not S_ISDIR(sloc[ST_MODE]):
self.logger.debug('%s is not a directory; recreating' \
% (current))
os.unlink(current)
os.mkdir(current)
except OSError:
return False
except OSError:
try:
self.logger.debug("Creating non-existent path %s" % current)
os.mkdir(current)
except OSError:
return False
# If we get here, then the parent directory should exist
if entry.get("paranoid", False) and self.setup.get("paranoid", False) \
and not (entry.get('current_exists', 'true') == 'false'):
bkupnam = entry.get('name').replace('/', '_')
if self.cmd.run("cp %s /var/cache/bcfg2/%s" % (entry.get('name'), bkupnam))[0]:
self.logger.error("Failed to create backup file for ConfigFile %s" % \
(entry.get('name')))
return False
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:
if type(entry.text) == unicode:
filedata = entry.text.encode(self.setup['encoding'])
else:
filedata = entry.text
newfile.write(filedata)
newfile.close()
try:
os.chown(newfile.name, normUid(entry), normGid(entry))
except KeyError:
self.logger.error("Failed to chown %s to %s:%s" % \
(entry.get('name'), entry.get('owner'),
entry.get('group')))
os.chown(newfile.name, 0, 0)
os.chmod(newfile.name, calcPerms(S_IFREG, entry.get('perms')))
os.rename(newfile.name, entry.get('name'))
if entry.get('mtime', '-1') != '-1':
try:
os.utime(entry.get('name'), (int(entry.get('mtime')),
int(entry.get('mtime'))))
except:
self.logger.error("ConfigFile %s mtime fix failed" \
% (entry.get('name')))
return False
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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