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See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with ssh-import-id. If not, see . import argparse import getpass import json try: from json.decoder import JSONDecodeError except ImportError: JSONDecodeError = ValueError import logging import os import distro import stat import subprocess import sys import tempfile import requests try: from urllib.parse import quote_plus except ImportError: from urllib import quote_plus from .version import VERSION DEFAULT_PROTO = "lp" logging.basicConfig(format='%(asctime)s %(levelname)s %(message)s', level=logging.INFO) parser = argparse.ArgumentParser( description='Authorize SSH public keys from trusted online identities.', prog="ssh-import-id") parser.add_argument( '-o', '--output', metavar='FILE', help='Write output to file (default ~/.ssh/authorized_keys)') parser.add_argument( '-r', '--remove', action="store_true", default=False, help='Remove a key from authorized keys file') parser.add_argument( '-u', '--useragent', metavar='USERAGENT', default="", help='Append to the http user agent string') parser.add_argument( 'userids', nargs='+', metavar="USERID", help='User IDs to import') parser.options = None TEMPFILES = [] def cleanup(): """ Cleanup tempfiles """ for f in TEMPFILES: if os.path.exists(f): os.unlink(f) def die(msg): """ The only thing in Perl worth keeping """ logging.error(msg) cleanup() sys.exit(1) def key_fingerprint(fields): """ Get the fingerprint for an SSH public key Returns None if not valid key material """ if not fields: return None if len(fields) < 3: return None tempfd, tempname = tempfile.mkstemp( prefix='ssh-auth-key-check', suffix='.pub') TEMPFILES.append(tempname) with os.fdopen(tempfd, "w") as tempf: tempf.write(" ".join(fields)) tempf.write("\n") keygen_proc = subprocess.Popen( ['ssh-keygen', '-l', '-f', tempname], stdout=subprocess.PIPE) keygen_out, _ = keygen_proc.communicate(None) if keygen_proc.returncode: # Non-zero RC: probably not a public key return None os.unlink(tempname) keygen_fields = keygen_out.split() if not keygen_fields or len(keygen_fields) < 2: # Empty output? return None out = [] for k in keygen_out.split(): out.append(str(k.decode('utf-8').strip())) return out def open_output(name, mode='a+'): """ Open output for writing, supporting either stdout or a filename """ if name == '-': return False return open(name, mode) def assert_parent_dir(keyfile): """ Ensure that the keyfile parent directory exists """ # Standard out: nothing to do if keyfile == "-": return True # Get output file parent directory if os.path.dirname(keyfile): parent_dir = os.path.dirname(keyfile) else: parent_dir = "." # Ensure parent directory exists if not os.path.exists(parent_dir): umask = os.umask(0o077) os.makedirs(parent_dir, 0o700) os.umask(umask) if os.path.isdir(parent_dir): return True else: die("Parent directory not found for output [%s]" % (keyfile)) return False def read_keyfile(): """ Locate key file, read the current state, return lines in a list """ keyfile = get_keyfile(parser.options.output) if keyfile == "-" or not os.path.exists(keyfile): lines = [] else: try: with open(keyfile, "r") as fp: lines = fp.readlines() except OSError: die("Could not read authorized key file [%s]" % (keyfile)) return lines def write_keyfile(keyfile_lines, mode): """ Locate key file, write lines to it """ output_file = get_keyfile(parser.options.output) if output_file == "-": for line in keyfile_lines: if line: sys.stdout.write(line) sys.stdout.write("\n\n") sys.stdout.flush() elif assert_parent_dir(output_file): with open(output_file, mode) as f: for line in keyfile_lines: if line.strip(): f.write(line) f.write("\n\n") def get_keyfile(path=None): """Return 'path' if true, else a path to current user's authorized_keys.""" if not path: if os.environ.get("HOME"): home = os.environ["HOME"] else: home = os.path.expanduser("~" + getpass.getuser()) path = os.path.join(home, ".ssh", "authorized_keys") return path def fp_tuple(fp): """ Build a string that uniquely identifies a key """ # An SSH public key is uniquely identified by the tuple # [length, hash, type]. fp should be a list of results of # the `ssh-keygen -l -f` command return ' '.join([fp[0], fp[1], fp[-1]]) def key_list(keyfile_lines): """ Return a list of uniquely identified keys """ # Map out which keys we already have keys = [] for line in keyfile_lines: ssh_fp = key_fingerprint(line.split()) if ssh_fp: keys.append(fp_tuple(ssh_fp)) logging.debug("Already have SSH public keys: [%s]", ' '.join(keys)) return keys def fetch_keys(proto, username, useragent): """ Call out to a subcommand to handle the specified protocol and username """ if proto == "lp": return fetch_keys_lp(username, useragent) elif proto == "gh": return fetch_keys_gh(username, useragent) die("ssh-import-id protocol handler %s: not found or cannot execute" % (proto)) def import_keys(proto, username, useragent): """ Import keys from service at 'proto' for 'username', appending to output file """ # Map out which keys we already have, so we don't append duplicates. local_keys = key_list(read_keyfile()) # Protocol handler should output SSH keys, one per line result = [] keyfile_lines = [] comment_string = "# ssh-import-id %s:%s" % (proto, username) for line in fetch_keys(proto, username, useragent).split('\n'): # Validate/clean-up key text line = line.strip() fields = line.split() fields.append(comment_string) ssh_fp = key_fingerprint(fields) if ssh_fp: if fp_tuple(ssh_fp) in local_keys: logging.info( "Already authorized %s", ssh_fp[:3] + ssh_fp[-1:]) result.append(fields) else: keyfile_lines.append(" ".join(fields)) result.append(fields) logging.info("Authorized key %s", ssh_fp[:3] + ssh_fp[-1:]) write_keyfile(keyfile_lines, "a+") return result def remove_keys(proto, username): """ Remove keys from the output file, if they were inserted by this tool """ # Only remove keys labeled with our comment string comment_string = "# ssh-import-id %s:%s\n" % (proto, username) update_lines = [] removed = [] for line in read_keyfile(): if line.endswith(comment_string): ssh_fp = key_fingerprint(line.split()) logging.info("Removed labeled key %s", ssh_fp[:3] + ssh_fp[-1:]) removed.append(line) else: update_lines.append(line) write_keyfile(update_lines, "w") return removed def user_agent(extra=""): """" Construct a useful user agent string """ ssh_import_id = "ssh-import-id/%s" % VERSION python = "python/%d.%d.%d" % ( sys.version_info.major, sys.version_info.minor, sys.version_info.micro) linux_dist = "/".join(distro.linux_distribution()) uname = "%s/%s/%s" % (os.uname()[0], os.uname()[2], os.uname()[4]) return "%s %s %s %s %s" % (ssh_import_id, python, linux_dist, uname, extra) def fetch_keys_lp(lpid, useragent): conf_file = "/etc/ssh/ssh_import_id" try: url = os.getenv("URL", None) if url is None and os.path.exists(conf_file): try: contents = open(conf_file).read() except OSError: raise Exception("Failed to read %s" % conf_file) try: conf = json.loads(contents) except JSONDecodeError: raise Exception( "File %s did not have valid JSON." % conf_file) url = conf.get("URL", None) % (quote_plus(lpid)) elif url is not None: url = url % (quote_plus(lpid)) # Finally, fall back to Launchpad if url is None: url = "https://launchpad.net/~%s/+sshkeys" % (quote_plus(lpid)) headers = {'User-Agent': user_agent(useragent)} response = requests.get(url, verify=True, headers=headers) if response.status_code != 200: msg = 'Requesting Launchpad keys failed.' if response.status_code == 404: msg = 'Launchpad user not found.' die(msg + " status_code=%d user=%s" % (response.status_code, lpid)) keys = str(response.text) # pylint: disable=broad-except except Exception as e: die(str(e)) return keys def fetch_keys_gh(ghid, useragent): x_ratelimit_remaining = 'x-ratelimit-remaining' help_url = 'https://developer.github.com/v3/#rate-limiting' keys = "" try: url = "https://api.github.com/users/%s/keys" % (quote_plus(ghid)) headers = {'User-Agent': user_agent(useragent)} resp = requests.get(url, headers=headers, verify=True) text = resp.text data = json.loads(text) if resp.status_code != 200: msg = 'Requesting GitHub keys failed.' if resp.status_code == 404: msg = 'Username "%s" not found at GitHub API.' % ghid elif resp.headers.get(x_ratelimit_remaining) == "0": msg = ('GitHub REST API rate-limited this IP address. See %s .' % help_url) die(msg + " status_code=%d user=%s" % (resp.status_code, ghid)) for keyobj in data: keys += "%s %s@github/%s\n" % (keyobj['key'], ghid, keyobj['id']) # pylint: disable=broad-except except Exception as e: die(str(e)) return keys def main(): errors = [] try: os.umask(0o177) parser.options = parser.parse_args() keys = [] for userid in parser.options.userids: user_pieces = userid.split(':') if len(user_pieces) == 2: proto, username = user_pieces elif len(user_pieces) == 1: proto, username = DEFAULT_PROTO, userid else: die("Invalid user ID: [%s]" % (userid)) if parser.options.remove: changes = remove_keys(proto, username) keys.extend(changes) action = "Removed" else: changes = import_keys( proto, username, parser.options.useragent) keys.extend(changes) action = "Authorized" if not changes: errors.append(userid) logging.info("[%d] SSH keys [%s]", len(keys), action) # pylint: disable=broad-except except Exception as e: die(str(e)) cleanup() if errors: die("No matching keys found for [%s]" % ','.join(errors)) sys.exit(0)