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-rwxr-xr-xscripts/x509keyid268
1 files changed, 0 insertions, 268 deletions
diff --git a/scripts/x509keyid b/scripts/x509keyid
deleted file mode 100755
index c8e91a4af385..000000000000
--- a/scripts/x509keyid
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@@ -1,268 +0,0 @@
1#!/usr/bin/perl -w
2#
3# Generate an identifier from an X.509 certificate that can be placed in a
4# module signature to indentify the key to use.
5#
6# Format:
7#
8# ./scripts/x509keyid <x509-cert> <signer's-name> <key-id>
9#
10# We read the DER-encoded X509 certificate and parse it to extract the Subject
11# name and Subject Key Identifier. The provide the data we need to build the
12# certificate identifier.
13#
14# The signer's name part of the identifier is fabricated from the commonName,
15# the organizationName or the emailAddress components of the X.509 subject
16# name and written to the second named file.
17#
18# The subject key ID to select which of that signer's certificates we're
19# intending to use to sign the module is written to the third named file.
20#
21use strict;
22
23my $raw_data;
24
25die "Need three filenames\n" if ($#ARGV != 2);
26
27my $src = $ARGV[0];
28
29open(FD, "<$src") || die $src;
30binmode FD;
31my @st = stat(FD);
32die $src if (!@st);
33read(FD, $raw_data, $st[7]) || die $src;
34close(FD);
35
36my $UNIV = 0 << 6;
37my $APPL = 1 << 6;
38my $CONT = 2 << 6;
39my $PRIV = 3 << 6;
40
41my $CONS = 0x20;
42
43my $BOOLEAN = 0x01;
44my $INTEGER = 0x02;
45my $BIT_STRING = 0x03;
46my $OCTET_STRING = 0x04;
47my $NULL = 0x05;
48my $OBJ_ID = 0x06;
49my $UTF8String = 0x0c;
50my $SEQUENCE = 0x10;
51my $SET = 0x11;
52my $UTCTime = 0x17;
53my $GeneralizedTime = 0x18;
54
55my %OIDs = (
56 pack("CCC", 85, 4, 3) => "commonName",
57 pack("CCC", 85, 4, 6) => "countryName",
58 pack("CCC", 85, 4, 10) => "organizationName",
59 pack("CCC", 85, 4, 11) => "organizationUnitName",
60 pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 1, 1) => "rsaEncryption",
61 pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 1, 5) => "sha1WithRSAEncryption",
62 pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 9, 1) => "emailAddress",
63 pack("CCC", 85, 29, 35) => "authorityKeyIdentifier",
64 pack("CCC", 85, 29, 14) => "subjectKeyIdentifier",
65 pack("CCC", 85, 29, 19) => "basicConstraints"
66);
67
68###############################################################################
69#
70# Extract an ASN.1 element from a string and return information about it.
71#
72###############################################################################
73sub asn1_extract($$@)
74{
75 my ($cursor, $expected_tag, $optional) = @_;
76
77 return [ -1 ]
78 if ($cursor->[1] == 0 && $optional);
79
80 die $src, ": ", $cursor->[0], ": ASN.1 data underrun (elem ", $cursor->[1], ")\n"
81 if ($cursor->[1] < 2);
82
83 my ($tag, $len) = unpack("CC", substr(${$cursor->[2]}, $cursor->[0], 2));
84
85 if ($expected_tag != -1 && $tag != $expected_tag) {
86 return [ -1 ]
87 if ($optional);
88 die $src, ": ", $cursor->[0], ": ASN.1 unexpected tag (", $tag,
89 " not ", $expected_tag, ")\n";
90 }
91
92 $cursor->[0] += 2;
93 $cursor->[1] -= 2;
94
95 die $src, ": ", $cursor->[0], ": ASN.1 long tag\n"
96 if (($tag & 0x1f) == 0x1f);
97 die $src, ": ", $cursor->[0], ": ASN.1 indefinite length\n"
98 if ($len == 0x80);
99
100 if ($len > 0x80) {
101 my $l = $len - 0x80;
102 die $src, ": ", $cursor->[0], ": ASN.1 data underrun (len len $l)\n"
103 if ($cursor->[1] < $l);
104
105 if ($l == 0x1) {
106 $len = unpack("C", substr(${$cursor->[2]}, $cursor->[0], 1));
107 } elsif ($l = 0x2) {
108 $len = unpack("n", substr(${$cursor->[2]}, $cursor->[0], 2));
109 } elsif ($l = 0x3) {
110 $len = unpack("C", substr(${$cursor->[2]}, $cursor->[0], 1)) << 16;
111 $len = unpack("n", substr(${$cursor->[2]}, $cursor->[0] + 1, 2));
112 } elsif ($l = 0x4) {
113 $len = unpack("N", substr(${$cursor->[2]}, $cursor->[0], 4));
114 } else {
115 die $src, ": ", $cursor->[0], ": ASN.1 element too long (", $l, ")\n";
116 }
117
118 $cursor->[0] += $l;
119 $cursor->[1] -= $l;
120 }
121
122 die $src, ": ", $cursor->[0], ": ASN.1 data underrun (", $len, ")\n"
123 if ($cursor->[1] < $len);
124
125 my $ret = [ $tag, [ $cursor->[0], $len, $cursor->[2] ] ];
126 $cursor->[0] += $len;
127 $cursor->[1] -= $len;
128
129 return $ret;
130}
131
132###############################################################################
133#
134# Retrieve the data referred to by a cursor
135#
136###############################################################################
137sub asn1_retrieve($)
138{
139 my ($cursor) = @_;
140 my ($offset, $len, $data) = @$cursor;
141 return substr($$data, $offset, $len);
142}
143
144###############################################################################
145#
146# Roughly parse the X.509 certificate
147#
148###############################################################################
149my $cursor = [ 0, length($raw_data), \$raw_data ];
150
151my $cert = asn1_extract($cursor, $UNIV | $CONS | $SEQUENCE);
152my $tbs = asn1_extract($cert->[1], $UNIV | $CONS | $SEQUENCE);
153my $version = asn1_extract($tbs->[1], $CONT | $CONS | 0, 1);
154my $serial_number = asn1_extract($tbs->[1], $UNIV | $INTEGER);
155my $sig_type = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
156my $issuer = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
157my $validity = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
158my $subject = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
159my $key = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
160my $issuer_uid = asn1_extract($tbs->[1], $CONT | $CONS | 1, 1);
161my $subject_uid = asn1_extract($tbs->[1], $CONT | $CONS | 2, 1);
162my $extension_list = asn1_extract($tbs->[1], $CONT | $CONS | 3, 1);
163
164my $subject_key_id = ();
165my $authority_key_id = ();
166
167#
168# Parse the extension list
169#
170if ($extension_list->[0] != -1) {
171 my $extensions = asn1_extract($extension_list->[1], $UNIV | $CONS | $SEQUENCE);
172
173 while ($extensions->[1]->[1] > 0) {
174 my $ext = asn1_extract($extensions->[1], $UNIV | $CONS | $SEQUENCE);
175 my $x_oid = asn1_extract($ext->[1], $UNIV | $OBJ_ID);
176 my $x_crit = asn1_extract($ext->[1], $UNIV | $BOOLEAN, 1);
177 my $x_val = asn1_extract($ext->[1], $UNIV | $OCTET_STRING);
178
179 my $raw_oid = asn1_retrieve($x_oid->[1]);
180 next if (!exists($OIDs{$raw_oid}));
181 my $x_type = $OIDs{$raw_oid};
182
183 my $raw_value = asn1_retrieve($x_val->[1]);
184
185 if ($x_type eq "subjectKeyIdentifier") {
186 my $vcursor = [ 0, length($raw_value), \$raw_value ];
187
188 $subject_key_id = asn1_extract($vcursor, $UNIV | $OCTET_STRING);
189 }
190 }
191}
192
193###############################################################################
194#
195# Determine what we're going to use as the signer's name. In order of
196# preference, take one of: commonName, organizationName or emailAddress.
197#
198###############################################################################
199my $org = "";
200my $cn = "";
201my $email = "";
202
203while ($subject->[1]->[1] > 0) {
204 my $rdn = asn1_extract($subject->[1], $UNIV | $CONS | $SET);
205 my $attr = asn1_extract($rdn->[1], $UNIV | $CONS | $SEQUENCE);
206 my $n_oid = asn1_extract($attr->[1], $UNIV | $OBJ_ID);
207 my $n_val = asn1_extract($attr->[1], -1);
208
209 my $raw_oid = asn1_retrieve($n_oid->[1]);
210 next if (!exists($OIDs{$raw_oid}));
211 my $n_type = $OIDs{$raw_oid};
212
213 my $raw_value = asn1_retrieve($n_val->[1]);
214
215 if ($n_type eq "organizationName") {
216 $org = $raw_value;
217 } elsif ($n_type eq "commonName") {
218 $cn = $raw_value;
219 } elsif ($n_type eq "emailAddress") {
220 $email = $raw_value;
221 }
222}
223
224my $id_name = $email;
225
226if ($org && $cn) {
227 # Don't use the organizationName if the commonName repeats it
228 if (length($org) <= length($cn) &&
229 substr($cn, 0, length($org)) eq $org) {
230 $id_name = $cn;
231 goto got_id_name;
232 }
233
234 # Or a signifcant chunk of it
235 if (length($org) >= 7 &&
236 length($cn) >= 7 &&
237 substr($cn, 0, 7) eq substr($org, 0, 7)) {
238 $id_name = $cn;
239 goto got_id_name;
240 }
241
242 $id_name = $org . ": " . $cn;
243} elsif ($org) {
244 $id_name = $org;
245} elsif ($cn) {
246 $id_name = $cn;
247}
248
249got_id_name:
250
251###############################################################################
252#
253# Output the signer's name and the key identifier that we're going to include
254# in module signatures.
255#
256###############################################################################
257die $src, ": ", "X.509: Couldn't find the Subject Key Identifier extension\n"
258 if (!$subject_key_id);
259
260my $id_key_id = asn1_retrieve($subject_key_id->[1]);
261
262open(OUTFD, ">$ARGV[1]") || die $ARGV[1];
263print OUTFD $id_name;
264close OUTFD || die $ARGV[1];
265
266open(OUTFD, ">$ARGV[2]") || die $ARGV[2];
267print OUTFD $id_key_id;
268close OUTFD || die $ARGV[2];
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-12 18:14:35 -0500