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| Dir : //lib/python3.6/site-packages/sssd/modules/request.py |
import re
import logging
from sssd.parser import SubparsersAction
from sssd.parser import Option
logger = logging.getLogger()
class RequestAnalyzer:
"""
A request analyzer module, handles request tracking logic
and analysis. Parses input generated from a source Reader.
"""
module_parser = None
consumed_logs = []
list_opts = [
Option('--verbose', 'Verbose output', bool, '-v'),
Option('--pam', 'Filter only PAM requests', bool),
]
show_opts = [
Option('cid', 'Track request with this ID', int),
Option('--child', 'Include child process logs', bool),
Option('--merge', 'Merge logs together sorted by timestamp', bool),
Option('--pam', 'Track only PAM requests', bool),
]
def print_module_help(self, args):
"""
Print the module parser help output
Args:
args (Namespace): argparse parsed arguments
"""
self.module_parser.print_help()
def setup_args(self, parser_grp, cli):
"""
Setup module parser, subcommands, and options
Args:
parser_grp (argparse.Action): Parser group to nest
module and subcommands under
"""
desc = "Analyze request tracking module"
self.module_parser = parser_grp.add_parser('request',
description=desc,
help='Request tracking')
subparser = self.module_parser.add_subparsers(title=None,
dest='subparser',
action=SubparsersAction,
metavar='COMMANDS')
subcmd_grp = subparser.add_parser_group('Operation Modes')
cli.add_subcommand(subcmd_grp, 'list', 'List recent requests',
self.list_requests, self.list_opts)
cli.add_subcommand(subcmd_grp, 'show', 'Track individual request ID',
self.track_request, self.show_opts)
self.module_parser.set_defaults(func=self.print_module_help)
return self.module_parser
def load(self, args):
"""
Load the appropriate source reader.
Args:
args (Namespace): argparse parsed arguments
Returns:
Instantiated source object
"""
if args.source == "journald":
from sssd.source_journald import Journald
source = Journald()
else:
from sssd.source_files import Files
source = Files(args.logdir)
return source
def matched_line(self, source, patterns):
"""
Yield lines which match any number of patterns (OR) in
provided patterns list.
Args:
source (Reader): source Reader object
Yields:
lines matching the provided pattern(s)
"""
for line in source:
for pattern in patterns:
re_obj = re.compile(pattern)
if re_obj.search(line):
if line.startswith(' * '):
continue
yield line
def get_linked_ids(self, source, pattern, regex):
"""
Retrieve list of associated REQ_TRACE ids. Filter
only source lines by pattern, then parse out the
linked id with the provided regex.
Args:
source (Reader): source Reader object
pattern (list of str): regex pattern(s) used for finding
linked ids
regex (str): regular expression used to extract linked id
Returns:
List of linked ids discovered
"""
linked_ids = []
for match in self.matched_line(source, pattern):
id_re = re.compile(regex)
match = id_re.search(match)
if match:
found = match.group(0)
linked_ids.append(found)
return linked_ids
def consume_line(self, line, source, consume):
"""
Print or consume a line, if merge cli option is provided then consume
boolean is set to True
Args:
line (str): line to process
source (Reader): source Reader object
consume (bool): If True, line is added to consume_logs
list, otherwise print line
Returns:
True if line was processed, otherwise False
"""
found_results = True
if consume:
self.consumed_logs.append(line.rstrip(line[-1]))
else:
# files source includes newline
if type(source).__name__ == 'Files':
print(line, end='')
else:
print(line)
return found_results
def print_formatted_verbose(self, source):
"""
Parse log file and print formatted verbose list_requests output
Args:
source (Reader): source Reader object
"""
data = {}
# collect cid log lines from single run through of parsing the log
# into dictionary # (cid, ts) -> logline_output
for line in source:
if "CID#" not in line:
continue
# parse CID and ts from line, key is a tuple of (cid,ts)
fields = line.split("[")
# timestamp to the minute, cut off seconds, ms
ts = fields[0][:17]
result = re.search('CID#[0-9]*', fields[3])
cid = result.group(0)
# if mapping exists, append line to output. Otherwise create new mapping
if (cid, ts) in data.keys():
data[(cid, ts)] += line
else:
data[(cid, ts)] = line
# pretty print the data
for k, v in data.items():
cr_done = []
id_done = []
for cidline in v.splitlines():
plugin = ""
name = ""
id = ""
# CR number
fields = cidline.split("[")
cr_field = fields[3][7:]
cr = cr_field.split(":")[0][4:]
# Client connected, top-level info line
if re.search(r'\[cmd', cidline):
self.print_formatted(cidline)
# CR Plugin name
if re.search("cache_req_send", cidline):
plugin = cidline.split('\'')[1]
id_done.clear()
# Extract CR number
fields = cidline.split("[")
cr_field = fields[3][7:]
cr = cr_field.split(":")[0][4:]
# CR Input name
elif re.search("cache_req_process_input", cidline):
name = cidline.rsplit('[')[-1]
# CR Input id
elif re.search("cache_req_search_send", cidline):
id = cidline.rsplit()[-1]
if plugin:
print(" - " + plugin)
if name:
# Avoid duplicate output with the same CR #
if cr not in cr_done:
print(" - " + name[:-1])
cr_done.append(cr)
if (id and ("UID" in cidline or "GID" in cidline)):
if id not in id_done and bool(re.search(r'\d', id)):
print(" - " + id)
id_done.append(id)
def print_formatted(self, line):
"""
Parse line and print formatted list_requests output
Args:
line (str): line to parse
Returns:
Client ID from printed line, 0 otherwise
"""
# exclude backtrace logs
if line.startswith(' * '):
return 0
if "refreshed" in line:
return 0
ts = line.split(")")[0]
ts = ts[1:]
fields = line.split("[")
cid = fields[3][4:-9]
cmd = fields[4][4:-1]
uid = fields[5][4:-1]
if not uid.isnumeric():
uid = fields[6][4:-1]
print(f'{ts}: [uid {uid}] CID #{cid}: {cmd}')
return cid
def list_requests(self, args):
"""
List component (default: NSS) responder requests
Args:
args (Namespace): populated argparse namespace
"""
source = self.load(args)
component = source.Component.NSS
resp = "nss"
# Log messages matching the following regex patterns contain
# the useful info we need to produce list output
patterns = [r'\[cmd']
if args.pam:
component = source.Component.PAM
resp = "pam"
logger.info(f"******** Listing {resp} client requests ********")
source.set_component(component, False)
if args.verbose:
self.print_formatted_verbose(source)
else:
for line in self.matched_line(source, patterns):
if type(source).__name__ == 'Journald':
print(line)
else:
self.print_formatted(line)
def track_request(self, args):
"""
Print Logs pertaining to individual SSSD client request
Args:
args (Namespace): populated argparse namespace
"""
source = self.load(args)
cid = args.cid
resp_results = False
be_results = False
component = source.Component.NSS
resp = "nss"
pattern = [rf"\[CID#{cid}\]"]
if args.pam:
component = source.Component.PAM
resp = "pam"
logger.info(f"******** Checking {resp} responder for Client ID"
f" {cid} *******")
source.set_component(component, args.child)
for match in self.matched_line(source, pattern):
resp_results = self.consume_line(match, source, args.merge)
logger.info(f"********* Checking Backend for Client ID {cid} ********")
pattern = [rf'REQ_TRACE.*\[sssd.{resp} CID #{cid}\]']
source.set_component(source.Component.BE, args.child)
be_id_regex = r'\[RID#[0-9]+\]'
be_ids = self.get_linked_ids(source, pattern, be_id_regex)
pattern.clear()
[pattern.append(f'\\{id}') for id in be_ids]
for match in self.matched_line(source, pattern):
be_results = self.consume_line(match, source, args.merge)
if args.merge:
# sort by date/timestamp
sorted_list = sorted(self.consumed_logs,
key=lambda s: s.split(')')[0])
for entry in sorted_list:
print(entry)
if not resp_results and not be_results:
logger.warn(f"ID {cid} not found in logs!")