summaryrefslogtreecommitdiffstats
path: root/ipaserver/install/installutils.py
blob: 4192024d3dc2ea14307195f50e4f0f546d7955c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
# Authors: Simo Sorce <ssorce@redhat.com>
#
# Copyright (C) 2007    Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.    See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

import logging
import socket
import errno
import getpass
import os
import re
import fileinput
import sys
import struct
import fcntl
import netaddr
import time
import tempfile
from ConfigParser import SafeConfigParser

from ipapython import ipautil, dnsclient, sysrestore

class HostnameLocalhost(Exception):
    pass

class ReplicaConfig:
    def __init__(self):
        self.realm_name = ""
        self.domain_name = ""
        self.master_host_name = ""
        self.dirman_password = ""
        self.host_name = ""
        self.dir = ""
        self.subject_base = ""
        self.setup_ca = False

def get_fqdn():
    fqdn = ""
    try:
        fqdn = socket.getfqdn()
    except:
        try:
            fqdn = socket.gethostname()
        except:
            fqdn = ""
    return fqdn

def verify_dns_records(host_name, responses, resaddr, family):
    familykw = { 'ipv4' : {
                             'dns_type' : dnsclient.DNS_T_A,
                             'socket_family' : socket.AF_INET,
                          },
                 'ipv6' : {
                             'dns_type' : dnsclient.DNS_T_AAAA,
                             'socket_family' : socket.AF_INET6,
                          },
               }

    family = family.lower()
    if family not in familykw.keys():
        raise RuntimeError("Unknown faimily %s\n" % family)

    rec = None
    for rsn in responses:
        if rsn.dns_type == familykw[family]['dns_type']:
            rec = rsn
            break

    if rec == None:
        raise IOError(errno.ENOENT,
                      "Warning: Hostname (%s) not found in DNS" % host_name)

    if family == 'ipv4':
        familykw[family]['address'] = socket.inet_ntop(socket.AF_INET,
                                                       struct.pack('!L',rec.rdata.address))
    else:
        familykw[family]['address'] = socket.inet_ntop(socket.AF_INET6,
                                                       struct.pack('!16B', *rec.rdata.address))

    # Check that DNS address is the same is address returned via standard glibc calls
    dns_addr = netaddr.IPAddress(familykw[family]['address'])
    if dns_addr.format() != resaddr:
        raise RuntimeError("The network address %s does not match the DNS lookup %s. Check /etc/hosts and ensure that %s is the IP address for %s" % (dns_addr.format(), resaddr, dns_addr.format(), host_name))

    rs = dnsclient.query(dns_addr.reverse_dns, dnsclient.DNS_C_IN, dnsclient.DNS_T_PTR)
    if len(rs) == 0:
        raise RuntimeError("Cannot find Reverse Address for %s (%s)" % (host_name, dns_addr.format()))

    rev = None
    for rsn in rs:
        if rsn.dns_type == dnsclient.DNS_T_PTR:
            rev = rsn
            break

    if rev == None:
        raise RuntimeError("Cannot find Reverse Address for %s (%s)" % (host_name, dns_addr.format()))

    if rec.dns_name != rev.rdata.ptrdname:
        raise RuntimeError("The DNS forward record %s does not match the reverse address %s" % (rec.dns_name, rev.rdata.ptrdname))


def verify_fqdn(host_name,no_host_dns=False):
    if len(host_name.split(".")) < 2 or host_name == "localhost.localdomain":
        raise RuntimeError("Invalid hostname '%s', must be fully-qualified." % host_name)

    if host_name != host_name.lower():
        raise RuntimeError("Invalid hostname '%s', must be lower-case." % host_name)

    if ipautil.valid_ip(host_name):
        raise RuntimeError("IP address not allowed as a hostname")

    if no_host_dns:
        print "Warning: skipping DNS resolution of host", host_name
        return

    try:
        hostaddr = socket.getaddrinfo(host_name, None)
    except:
        raise RuntimeError("Unable to resolve host name, check /etc/hosts or DNS name resolution")

    if len(hostaddr) == 0:
        raise RuntimeError("Unable to resolve host name, check /etc/hosts or DNS name resolution")

    for a in hostaddr:
        if a[4][0] == '127.0.0.1' or a[4][0] == '::1':
            raise RuntimeError("The IPA Server hostname must not resolve to localhost (%s). A routable IP address must be used. Check /etc/hosts to see if %s is an alias for %s" % (a[4][0], host_name, a[4][0]))
        try:
            resaddr = a[4][0]
            revname = socket.gethostbyaddr(a[4][0])[0]
        except:
            raise RuntimeError("Unable to resolve the reverse ip address, check /etc/hosts or DNS name resolution")
        if revname != host_name:
            raise RuntimeError("The host name %s does not match the reverse lookup %s" % (host_name, revname))

    # Verify this is NOT a CNAME
    rs = dnsclient.query(host_name+".", dnsclient.DNS_C_IN, dnsclient.DNS_T_CNAME)
    if len(rs) != 0:
        for rsn in rs:
            if rsn.dns_type == dnsclient.DNS_T_CNAME:
                raise RuntimeError("The IPA Server Hostname cannot be a CNAME, only A and AAAA names are allowed.")

    # Verify that it is a DNS A or AAAA record
    rs = dnsclient.query(host_name+".", dnsclient.DNS_C_IN, dnsclient.DNS_T_A)
    if len([ rec for rec in rs if rec.dns_type is not dnsclient.DNS_T_SOA ]) > 0:
        verify_dns_records(host_name, rs, resaddr, 'ipv4')
        return

    rs = dnsclient.query(host_name+".", dnsclient.DNS_C_IN, dnsclient.DNS_T_AAAA)
    if len([ rec for rec in rs if rec.dns_type is not dnsclient.DNS_T_SOA ]) > 0:
        verify_dns_records(host_name, rs, resaddr, 'ipv6')
        return
    else:
        print "Warning: Hostname (%s) not found in DNS" % host_name

def record_in_hosts(ip, host_name, file="/etc/hosts"):
    hosts = open(file, 'r').readlines()
    for line in hosts:
        line = line.rstrip('\n')
        fields = line.partition('#')[0].split()
        if len(fields) == 0:
            continue

        try:
            hosts_ip = fields[0]
            names = fields[1:]

            if hosts_ip != ip:
                continue
            if host_name in names:
                return True
        except IndexError:
            print "Warning: Erroneous line '%s' in %s" % (line, file)
            continue

    return False

def add_record_to_hosts(ip, host_name, file="/etc/hosts"):
    hosts_fd = open(file, 'r+')
    hosts_fd.seek(0, 2)
    hosts_fd.write(ip+'\t'+host_name+' '+host_name.split('.')[0]+'\n')
    hosts_fd.close()

def read_ip_address(host_name, fstore):
    while True:
        ip = ipautil.user_input("Please provide the IP address to be used for this host name", allow_empty = False)
        try:
            ip_parsed = ipautil.CheckedIPAddress(ip, match_local=True)
        except Exception, e:
            print "Error: Invalid IP Address %s: %s" % (ip, e)
            continue
        else:
            break

    ip = str(ip_parsed)
    print "Adding ["+ip+" "+host_name+"] to your /etc/hosts file"
    fstore.backup_file("/etc/hosts")
    add_record_to_hosts(ip, host_name)

    return ip_parsed

def read_dns_forwarders():
    addrs = []
    if ipautil.user_input("Do you want to configure DNS forwarders?", True):
        print "Enter the IP address of DNS forwarder to use, or press Enter to finish."

        while True:
            ip = ipautil.user_input("Enter IP address for a DNS forwarder",
                                    allow_empty=True)
            if not ip:
                break
            try:
                ip_parsed = ipautil.CheckedIPAddress(ip, parse_netmask=False)
            except Exception, e:
                print "Error: Invalid IP Address %s: %s" % (ip, e)
                print "DNS forwarder %s not added" % ip
                continue

            print "DNS forwarder %s added" % ip
            addrs.append(str(ip_parsed))

    if not addrs:
        print "No DNS forwarders configured"

    return addrs

def port_available(port):
    """Try to bind to a port on the wildcard host
       Return 1 if the port is available
       Return 0 if the port is in use
    """
    rv = 1

    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        fcntl.fcntl(s, fcntl.F_SETFD, fcntl.FD_CLOEXEC)
        s.bind(('', port))
        s.close()
    except socket.error, e:
        if e[0] == errno.EADDRINUSE:
            rv = 0

    if rv:
        try:
            s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            fcntl.fcntl(s, fcntl.F_SETFD, fcntl.FD_CLOEXEC)
            s.bind(('', port))
            s.close()
        except socket.error, e:
            if e[0] == errno.EADDRINUSE:
                rv = 0

    return rv

def standard_logging_setup(log_filename, debug=False, filemode='w'):
    old_umask = os.umask(077)
    # Always log everything (i.e., DEBUG) to the log
    # file.
    logging.basicConfig(level=logging.DEBUG,
                        format='%(asctime)s %(levelname)s %(message)s',
                        filename=log_filename,
                        filemode=filemode)
    os.umask(old_umask)

    console = logging.StreamHandler()
    # If the debug option is set, also log debug messages to the console
    if debug:
        console.setLevel(logging.DEBUG)
    else:
        # Otherwise, log critical and error messages
        console.setLevel(logging.ERROR)
    formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
    console.setFormatter(formatter)
    logging.getLogger('').addHandler(console)

def get_password(prompt):
    if os.isatty(sys.stdin.fileno()):
        return getpass.getpass(prompt)
    else:
        return sys.stdin.readline().rstrip()

def read_password(user, confirm=True, validate=True, retry=True):
    correct = False
    pwd = ""
    while not correct:
        if not retry:
            correct = True
        pwd = get_password(user + " password: ")
        if not pwd:
            continue
        if validate and len(pwd) < 8:
            print "Password must be at least 8 characters long"
            pwd = ""
            continue
        if not confirm:
            correct = True
            continue
        pwd_confirm = get_password("Password (confirm): ")
        if pwd != pwd_confirm:
            print "Password mismatch!"
            print ""
            pwd = ""
        else:
            correct = True
    print ""
    return pwd

def update_file(filename, orig, subst):
    if os.path.exists(filename):
        st = os.stat(filename)
        pattern = "%s" % re.escape(orig)
        p = re.compile(pattern)
        for line in fileinput.input(filename, inplace=1):
            if not p.search(line):
                sys.stdout.write(line)
            else:
                sys.stdout.write(p.sub(subst, line))
        fileinput.close()
        os.chown(filename, st.st_uid, st.st_gid) # reset perms
        return 0
    else:
        print "File %s doesn't exist." % filename
        return 1

def set_directive(filename, directive, value, quotes=True, separator=' '):
    """Set a name/value pair directive in a configuration file.

       A value of None means to drop the directive.

       This has only been tested with nss.conf
    """
    valueset = False
    st = os.stat(filename)
    fd = open(filename)
    newfile = []
    for line in fd:
        if directive in line:
            valueset = True
            if value is not None:
                if quotes:
                    newfile.append('%s%s"%s"\n' % (directive, separator, value))
                else:
                    newfile.append('%s%s%s\n' % (directive, separator, value))
        else:
            newfile.append(line)
    fd.close()
    if not valueset:
        if value is not None:
            if quotes:
                newfile.append('%s%s"%s"\n' % (directive, separator, value))
            else:
                newfile.append('%s%s%s\n' % (directive, separator, value))

    fd = open(filename, "w")
    fd.write("".join(newfile))
    fd.close()
    os.chown(filename, st.st_uid, st.st_gid) # reset perms

def get_directive(filename, directive, separator=' '):
    """
    A rather inefficient way to get a configuration directive.
    """
    fd = open(filename, "r")
    for line in fd:
        if directive in line:
            line = line.strip()
            result = line.split(separator, 1)[1]
            result = result.strip('"')
            result = result.strip(' ')
            fd.close()
            return result
    fd.close()
    return None

def kadmin(command):
    ipautil.run(["kadmin.local", "-q", command,
                                 "-x", "ipa-setup-override-restrictions"])

def kadmin_addprinc(principal):
    kadmin("addprinc -randkey " + principal)

def kadmin_modprinc(principal, options):
    kadmin("modprinc " + options + " " + principal)

def create_keytab(path, principal):
    try:
        if ipautil.file_exists(path):
            os.remove(path)
    except os.error:
        logging.critical("Failed to remove %s." % path)

    kadmin("ktadd -k " + path + " " + principal)

def wait_for_open_ports(host, ports, timeout=0):
    """
    Wait until the specified port(s) on the remote host are open. Timeout
    in seconds may be specified to limit the wait.
    """
    if not isinstance(ports, (tuple, list)):
        ports = [ports]

    op_timeout = time.time() + timeout
    ipv6_failover = False

    for port in ports:
        while True:
            try:
                if ipv6_failover:
                    s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
                else:
                    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                s.connect((host, port))
                s.close()
                break;
            except socket.error, e:
                if e.errno == 111:  # 111: Connection refused
                    if timeout and time.time() > op_timeout: # timeout exceeded
                        raise e
                    time.sleep(1)
                elif not ipv6_failover: # fallback to IPv6 connection
                    ipv6_failover = True
                else:
                    raise e

def resolve_host(host_name):
    try:
        addrinfos = socket.getaddrinfo(host_name, None,
                                       socket.AF_UNSPEC, socket.SOCK_STREAM)
        for ai in addrinfos:
            ip = ai[4][0]
            if ip == "127.0.0.1" or ip == "::1":
                raise HostnameLocalhost("The hostname resolves to the localhost address")

        return addrinfos[0][4][0]
    except:
        return None

def get_host_name(no_host_dns):
    """
    Get the current FQDN from the socket and verify that it is valid.

    no_host_dns is a boolean that determines whether we enforce that the
    hostname is resolvable.

    Will raise a RuntimeError on error, returns hostname on success
    """
    hostname = get_fqdn()
    verify_fqdn(hostname, no_host_dns)
    return hostname

def expand_replica_info(filename, password):
    """
    Decrypt and expand a replica installation file into a temporary
    location. The caller is responsible to remove this directory.
    """
    top_dir = tempfile.mkdtemp("ipa")
    tarfile = top_dir+"/files.tar"
    dir = top_dir + "/realm_info"
    ipautil.decrypt_file(filename, tarfile, password, top_dir)
    ipautil.run(["tar", "xf", tarfile, "-C", top_dir])
    os.remove(tarfile)

    return top_dir, dir

def read_replica_info(dir, rconfig):
    """
    Read the contents of a replica installation file.

    rconfig is a ReplicaConfig object
    """
    filename = dir + "/realm_info"
    fd = open(filename)
    config = SafeConfigParser()
    config.readfp(fd)

    rconfig.realm_name = config.get("realm", "realm_name")
    rconfig.master_host_name = config.get("realm", "master_host_name")
    rconfig.domain_name = config.get("realm", "domain_name")
    rconfig.host_name = config.get("realm", "destination_host")
    rconfig.subject_base = config.get("realm", "subject_base")

def check_server_configuration():
    """
    Check if IPA server is configured on the system.

    This is done by checking if there are system restore (uninstall) files
    present on the system. Note that this check can only be run with root
    privileges.

    When IPA is not configured, this function raises a RuntimeError exception.
    Most convenient use case for the function is in install tools that require
    configured IPA for its function.
    """
    server_fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore')
    if not server_fstore.has_files():
        raise RuntimeError("IPA is not configured on this system.")