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4a544c9d | 1 | #!@PERL@ -w |
2 | ||
3 | use strict; | |
4 | use Pod::Usage; | |
5 | use Getopt::Long; | |
6 | use File::Basename; | |
7 | use Date::Format; | |
8 | ||
9 | =pod | |
10 | ||
11 | =head1 NAME | |
12 | ||
13 | ext_kerberos_sid_group_acl - external ACL helper for Squid to verify AD Domain group membership using sid. | |
14 | ||
15 | =head1 SYNOPSIS | |
16 | ||
17 | ext_kerberos_sid_group_acl [-d] [-h] -p Principal Name -D Domain Controller -b Base DN -G Group1:Group2 | |
18 | ||
19 | =head1 DESCRIPTION | |
20 | ||
21 | B<ext_kerberos_sid_group_acl> is an installed executable script. | |
22 | It uses B<ldapsearch> from Openldap to lookup the name of a AD group sid. | |
23 | ||
24 | This helper must be used in with the negotiate_kerberos_auth helper in a | |
25 | Microsft AD or Samba environement. | |
26 | ||
27 | It reads from the standard input the domain username and a list of group sids | |
28 | and tries to match the group SIDs to the AD group sids. | |
29 | ||
30 | =head1 OPTIONS | |
31 | ||
32 | =over 12 | |
33 | ||
34 | =item B<-d> | |
35 | ||
36 | Write debug info to stderr. | |
37 | ||
38 | =item B<-h> | |
39 | ||
40 | Print the help. | |
41 | ||
42 | =item B<-p principal name> | |
43 | ||
44 | Principal name in squid keytab to use for ldap authentication to AD | |
45 | ||
46 | =item B<-D domain controller> | |
47 | ||
48 | Domain controller to contact to lookup group SID | |
49 | ||
50 | =item B<-b base DN> | |
51 | ||
52 | Base DN for ldap search | |
53 | ||
54 | =item B<-G AD group name> | |
55 | ||
56 | AD group name to be used for SID lookup. List separated by a colon (:) | |
57 | ||
58 | =back | |
59 | ||
60 | =head1 CONFIGURATION | |
61 | ||
62 | auth_param negotiate program /path/to/negotiate_wrapper_auth -d \ | |
63 | --ntlm /path/to/ntlm_auth --helper-protocol=squid-2.5-ntlmssp --domain example.com \ | |
64 | --kerberos /path/to/negotiate_kerberos_auth -d -s GSS_C_NO_NAME -k /path/to/squid.keytab -t none | |
65 | external_acl_type sid_check %LOGIN %note{group} /path/to/kerberos_sid_group_acl -p principal -D dc1.example.com -b "DC=example,DC=com" -G Group1:Group2 | |
66 | acl squid_allow external sid_check | |
67 | acl allowed_group external sid_check | |
68 | http_access allow allowed_group | |
69 | ||
70 | If the local perl interpreter is in a unusual location it may need to be added: | |
71 | ||
72 | external_acl_type sid_check %LOGIN %note{group} /path/to/perl /path/to/kerberos_sid_group_acl -p principal -D dc1.example.com -b "DC=example,DC=com" -G Group1:Group2 | |
73 | ||
74 | =head1 AUTHOR | |
75 | ||
76 | This program was written by Markus Moeller <markus_moeller@compuserve.com> | |
77 | ||
78 | This manual was written by Markus Moeller <markus_moeller@compuserve.com> | |
79 | ||
80 | =head1 COPYRIGHT | |
81 | ||
77b1029d | 82 | * Copyright (C) 1996-2020 The Squid Software Foundation and contributors |
4a544c9d | 83 | * |
84 | * Squid software is distributed under GPLv2+ license and includes | |
85 | * contributions from numerous individuals and organizations. | |
86 | * Please see the COPYING and CONTRIBUTORS files for details. | |
87 | ||
88 | This program is put in the public domain by Markus Moeller | |
89 | <markus_moeller@compuserve.com>. It is distributed in the hope that it will | |
90 | be useful, but WITHOUT ANY WARRANTY; without even the implied warranty | |
91 | of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
92 | ||
93 | =head1 QUESTIONS | |
94 | ||
95 | Questions on the usage of this program can be sent to the I<Squid Users mailing list <squid-users@lists.squid-cache.org>> | |
96 | ||
97 | =head1 REPORTING BUGS | |
98 | ||
99 | Bug reports need to be made in English. | |
100 | See http://wiki.squid-cache.org/SquidFaq/BugReporting for details of what you need to include with your bug report. | |
101 | ||
102 | Report bugs or bug fixes using http://bugs.squid-cache.org/ | |
103 | ||
104 | Report serious security bugs to I<Squid Bugs <squid-bugs@lists.squid-cache.org>> | |
105 | ||
106 | Report ideas for new improvements to the I<Squid Developers mailing list <squid-dev@lists.squid-cache.org>> | |
107 | ||
108 | =head1 SEE ALSO | |
109 | ||
110 | negotiate_kerberos_auth(8) | |
111 | ||
112 | The Squid FAQ wiki http://wiki.squid-cache.org/SquidFaq | |
113 | ||
114 | The Squid Configuration Manual http://www.squid-cache.org/Doc/config/ | |
115 | ||
116 | =cut | |
117 | ||
118 | # | |
119 | # Version history: | |
120 | # 2018-06-10 Markus Moeller <markus_moeller@compuserve.com> | |
121 | # Initial release | |
122 | # | |
123 | # Globals | |
124 | # | |
125 | use vars qw/ %opt /; | |
126 | ||
127 | my $name = basename($0); | |
128 | my $principal; | |
129 | my $dc; | |
130 | my $basedn; | |
131 | my $ccname="/tmp/squid_krb5cc"; | |
132 | my $groupSIDs; | |
133 | my @ADgroupSIDs; | |
134 | my $user; | |
135 | my @groups; | |
136 | my $ans; | |
137 | ||
138 | # Disable output buffering | |
139 | $|=1; | |
140 | ||
141 | sub debug() | |
142 | { | |
143 | my @lt = localtime; | |
144 | print STDERR strftime("%Y/%m/%d %H:%M:%S", @lt)." | $name: @_\n" if $opt{d}; | |
145 | } | |
146 | ||
147 | sub info() | |
148 | { | |
149 | my @lt = localtime; | |
150 | print STDERR strftime("%Y/%m/%d %H:%M:%S", @lt)." | $name: @_\n"; | |
151 | } | |
152 | ||
153 | sub check() | |
154 | { | |
155 | if ( grep( /^@_$/, @ADgroupSIDs) ) { | |
156 | &debug("DEBUG: Found @_ in AD group SID"); | |
157 | return "OK"; | |
158 | } else { | |
159 | &debug("DEBUG: Did not find @_ in AD group SID"); | |
160 | return "ERR"; | |
161 | } | |
162 | } | |
163 | ||
164 | # | |
165 | # Command line options processing | |
166 | # | |
167 | sub init() | |
168 | { | |
169 | use Getopt::Std; | |
170 | my $errmsg; | |
171 | my $opt_string = 'hdD:p:b:G:'; | |
172 | getopts( "$opt_string", \%opt ) or usage(); | |
173 | Pod::Usage::pod2usage(1) if $opt{h}; | |
174 | Pod::Usage::pod2usage(1) if not defined $opt{D}; | |
175 | Pod::Usage::pod2usage(1) if not defined $opt{b}; | |
176 | Pod::Usage::pod2usage(1) if not defined $opt{p}; | |
177 | Pod::Usage::pod2usage(1) if not defined $opt{G}; | |
178 | ||
179 | $ENV{'KRB5CCNAME'} = $ccname; | |
180 | ||
181 | @groups = split(/:/,$opt{G}); | |
182 | $errmsg=`kinit -k $opt{p} 2>&1`; | |
183 | &info("ERROR: $errmsg") if $errmsg; | |
184 | exit 99 if $errmsg; | |
185 | ||
186 | $errmsg=""; | |
187 | foreach my $group (@groups) { | |
188 | open(LDAP, "ldapsearch -LLL -Ygssapi -H ldap://$opt{D}:389 -s sub -b \"$opt{b}\" \"(CN=$group)\" objectsid 2>&1 |"); | |
189 | my $sid; | |
190 | while (<LDAP>) { | |
191 | chomp($_); | |
192 | if ( $_ =~ /^object/ && defined $sid ) { | |
193 | &info("ERROR: multiple SIDs returned for group $group"); | |
194 | } elsif ( $_ =~ /^object/ ) { | |
195 | $sid=$_; | |
196 | $sid=~s/^[^\s]+\s+//; | |
197 | } else { | |
198 | $errmsg=$errmsg.";".$_; | |
199 | } | |
200 | } | |
201 | close(LDAP); | |
202 | if ( ! defined $sid ) { | |
203 | $errmsg=~s/^;//; | |
204 | &info("ERROR: $errmsg"); | |
205 | &info("ERROR: no SID returned for group $group"); | |
206 | } else { | |
207 | &info("INFO:ldapsearch result Group=$group, SID=$sid"); | |
208 | push @ADgroupSIDs, $sid; | |
209 | } | |
210 | } | |
211 | &info("ERROR: Exit as no sid was found for any group") if ! @ADgroupSIDs; | |
212 | exit 99 if ! @ADgroupSIDs; | |
213 | } | |
214 | ||
215 | init(); | |
216 | &debug("INFO: Debugging mode ON."); | |
217 | ||
218 | # | |
219 | # Main loop | |
220 | # | |
221 | while (<STDIN>) { | |
222 | chop; | |
223 | &debug("DEBUG: Got $_ from squid"); | |
224 | ($user, $groupSIDs) = split(/\s+/); | |
225 | if ( defined $user && defined $groupSIDs ) { | |
226 | &debug("DEBUG: user=$user"); | |
227 | &debug("DEBUG: groups=$groupSIDs"); | |
228 | # test for each group squid send in it's request | |
229 | foreach my $group (split(/,/,$groupSIDs)) { | |
230 | $ans = &check($group); | |
231 | last if $ans eq "OK"; | |
232 | } | |
233 | &debug("DEBUG: Sending $ans to squid"); | |
234 | print "$ans\n"; | |
235 | } else { | |
236 | &debug("DEBUG: Sending ERR to squid"); | |
237 | print "ERR\n"; | |
238 | } | |
239 | } | |
240 |