Root/
1 | #!/usr/bin/perl -w |
2 | # |
3 | # Sign a module file using the given key. |
4 | # |
5 | |
6 | my $USAGE = |
7 | "Usage: scripts/sign-file [-v] <hash algo> <key> <x509> <module> [<dest>]\n" . |
8 | " scripts/sign-file [-v] -s <raw sig> <hash algo> <x509> <module> [<dest>]\n"; |
9 | |
10 | use strict; |
11 | use FileHandle; |
12 | use IPC::Open2; |
13 | use Getopt::Std; |
14 | |
15 | my %opts; |
16 | getopts('vs:', \%opts) or die $USAGE; |
17 | my $verbose = $opts{'v'}; |
18 | my $signature_file = $opts{'s'}; |
19 | |
20 | die $USAGE if ($#ARGV > 4); |
21 | die $USAGE if (!$signature_file && $#ARGV < 3 || $signature_file && $#ARGV < 2); |
22 | |
23 | my $dgst = shift @ARGV; |
24 | my $private_key; |
25 | if (!$signature_file) { |
26 | $private_key = shift @ARGV; |
27 | } |
28 | my $x509 = shift @ARGV; |
29 | my $module = shift @ARGV; |
30 | my ($dest, $keep_orig); |
31 | if (@ARGV) { |
32 | $dest = $ARGV[0]; |
33 | $keep_orig = 1; |
34 | } else { |
35 | $dest = $module . "~"; |
36 | } |
37 | |
38 | die "Can't read private key\n" if (!$signature_file && !-r $private_key); |
39 | die "Can't read signature file\n" if ($signature_file && !-r $signature_file); |
40 | die "Can't read X.509 certificate\n" unless (-r $x509); |
41 | die "Can't read module\n" unless (-r $module); |
42 | |
43 | # |
44 | # Function to read the contents of a file into a variable. |
45 | # |
46 | sub read_file($) |
47 | { |
48 | my ($file) = @_; |
49 | my $contents; |
50 | my $len; |
51 | |
52 | open(FD, "<$file") || die $file; |
53 | binmode FD; |
54 | my @st = stat(FD); |
55 | die $file if (!@st); |
56 | $len = read(FD, $contents, $st[7]) || die $file; |
57 | close(FD) || die $file; |
58 | die "$file: Wanted length ", $st[7], ", got ", $len, "\n" |
59 | if ($len != $st[7]); |
60 | return $contents; |
61 | } |
62 | |
63 | ############################################################################### |
64 | # |
65 | # First of all, we have to parse the X.509 certificate to find certain details |
66 | # about it. |
67 | # |
68 | # We read the DER-encoded X509 certificate and parse it to extract the Subject |
69 | # name and Subject Key Identifier. Theis provides the data we need to build |
70 | # the certificate identifier. |
71 | # |
72 | # The signer's name part of the identifier is fabricated from the commonName, |
73 | # the organizationName or the emailAddress components of the X.509 subject |
74 | # name. |
75 | # |
76 | # The subject key ID is used to select which of that signer's certificates |
77 | # we're intending to use to sign the module. |
78 | # |
79 | ############################################################################### |
80 | my $x509_certificate = read_file($x509); |
81 | |
82 | my $UNIV = 0 << 6; |
83 | my $APPL = 1 << 6; |
84 | my $CONT = 2 << 6; |
85 | my $PRIV = 3 << 6; |
86 | |
87 | my $CONS = 0x20; |
88 | |
89 | my $BOOLEAN = 0x01; |
90 | my $INTEGER = 0x02; |
91 | my $BIT_STRING = 0x03; |
92 | my $OCTET_STRING = 0x04; |
93 | my $NULL = 0x05; |
94 | my $OBJ_ID = 0x06; |
95 | my $UTF8String = 0x0c; |
96 | my $SEQUENCE = 0x10; |
97 | my $SET = 0x11; |
98 | my $UTCTime = 0x17; |
99 | my $GeneralizedTime = 0x18; |
100 | |
101 | my %OIDs = ( |
102 | pack("CCC", 85, 4, 3) => "commonName", |
103 | pack("CCC", 85, 4, 6) => "countryName", |
104 | pack("CCC", 85, 4, 10) => "organizationName", |
105 | pack("CCC", 85, 4, 11) => "organizationUnitName", |
106 | pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 1, 1) => "rsaEncryption", |
107 | pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 1, 5) => "sha1WithRSAEncryption", |
108 | pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 9, 1) => "emailAddress", |
109 | pack("CCC", 85, 29, 35) => "authorityKeyIdentifier", |
110 | pack("CCC", 85, 29, 14) => "subjectKeyIdentifier", |
111 | pack("CCC", 85, 29, 19) => "basicConstraints" |
112 | ); |
113 | |
114 | ############################################################################### |
115 | # |
116 | # Extract an ASN.1 element from a string and return information about it. |
117 | # |
118 | ############################################################################### |
119 | sub asn1_extract($$@) |
120 | { |
121 | my ($cursor, $expected_tag, $optional) = @_; |
122 | |
123 | return [ -1 ] |
124 | if ($cursor->[1] == 0 && $optional); |
125 | |
126 | die $x509, ": ", $cursor->[0], ": ASN.1 data underrun (elem ", $cursor->[1], ")\n" |
127 | if ($cursor->[1] < 2); |
128 | |
129 | my ($tag, $len) = unpack("CC", substr(${$cursor->[2]}, $cursor->[0], 2)); |
130 | |
131 | if ($expected_tag != -1 && $tag != $expected_tag) { |
132 | return [ -1 ] |
133 | if ($optional); |
134 | die $x509, ": ", $cursor->[0], ": ASN.1 unexpected tag (", $tag, |
135 | " not ", $expected_tag, ")\n"; |
136 | } |
137 | |
138 | $cursor->[0] += 2; |
139 | $cursor->[1] -= 2; |
140 | |
141 | die $x509, ": ", $cursor->[0], ": ASN.1 long tag\n" |
142 | if (($tag & 0x1f) == 0x1f); |
143 | die $x509, ": ", $cursor->[0], ": ASN.1 indefinite length\n" |
144 | if ($len == 0x80); |
145 | |
146 | if ($len > 0x80) { |
147 | my $l = $len - 0x80; |
148 | die $x509, ": ", $cursor->[0], ": ASN.1 data underrun (len len $l)\n" |
149 | if ($cursor->[1] < $l); |
150 | |
151 | if ($l == 0x1) { |
152 | $len = unpack("C", substr(${$cursor->[2]}, $cursor->[0], 1)); |
153 | } elsif ($l == 0x2) { |
154 | $len = unpack("n", substr(${$cursor->[2]}, $cursor->[0], 2)); |
155 | } elsif ($l == 0x3) { |
156 | $len = unpack("C", substr(${$cursor->[2]}, $cursor->[0], 1)) << 16; |
157 | $len = unpack("n", substr(${$cursor->[2]}, $cursor->[0] + 1, 2)); |
158 | } elsif ($l == 0x4) { |
159 | $len = unpack("N", substr(${$cursor->[2]}, $cursor->[0], 4)); |
160 | } else { |
161 | die $x509, ": ", $cursor->[0], ": ASN.1 element too long (", $l, ")\n"; |
162 | } |
163 | |
164 | $cursor->[0] += $l; |
165 | $cursor->[1] -= $l; |
166 | } |
167 | |
168 | die $x509, ": ", $cursor->[0], ": ASN.1 data underrun (", $len, ")\n" |
169 | if ($cursor->[1] < $len); |
170 | |
171 | my $ret = [ $tag, [ $cursor->[0], $len, $cursor->[2] ] ]; |
172 | $cursor->[0] += $len; |
173 | $cursor->[1] -= $len; |
174 | |
175 | return $ret; |
176 | } |
177 | |
178 | ############################################################################### |
179 | # |
180 | # Retrieve the data referred to by a cursor |
181 | # |
182 | ############################################################################### |
183 | sub asn1_retrieve($) |
184 | { |
185 | my ($cursor) = @_; |
186 | my ($offset, $len, $data) = @$cursor; |
187 | return substr($$data, $offset, $len); |
188 | } |
189 | |
190 | ############################################################################### |
191 | # |
192 | # Roughly parse the X.509 certificate |
193 | # |
194 | ############################################################################### |
195 | my $cursor = [ 0, length($x509_certificate), \$x509_certificate ]; |
196 | |
197 | my $cert = asn1_extract($cursor, $UNIV | $CONS | $SEQUENCE); |
198 | my $tbs = asn1_extract($cert->[1], $UNIV | $CONS | $SEQUENCE); |
199 | my $version = asn1_extract($tbs->[1], $CONT | $CONS | 0, 1); |
200 | my $serial_number = asn1_extract($tbs->[1], $UNIV | $INTEGER); |
201 | my $sig_type = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE); |
202 | my $issuer = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE); |
203 | my $validity = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE); |
204 | my $subject = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE); |
205 | my $key = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE); |
206 | my $issuer_uid = asn1_extract($tbs->[1], $CONT | $CONS | 1, 1); |
207 | my $subject_uid = asn1_extract($tbs->[1], $CONT | $CONS | 2, 1); |
208 | my $extension_list = asn1_extract($tbs->[1], $CONT | $CONS | 3, 1); |
209 | |
210 | my $subject_key_id = (); |
211 | my $authority_key_id = (); |
212 | |
213 | # |
214 | # Parse the extension list |
215 | # |
216 | if ($extension_list->[0] != -1) { |
217 | my $extensions = asn1_extract($extension_list->[1], $UNIV | $CONS | $SEQUENCE); |
218 | |
219 | while ($extensions->[1]->[1] > 0) { |
220 | my $ext = asn1_extract($extensions->[1], $UNIV | $CONS | $SEQUENCE); |
221 | my $x_oid = asn1_extract($ext->[1], $UNIV | $OBJ_ID); |
222 | my $x_crit = asn1_extract($ext->[1], $UNIV | $BOOLEAN, 1); |
223 | my $x_val = asn1_extract($ext->[1], $UNIV | $OCTET_STRING); |
224 | |
225 | my $raw_oid = asn1_retrieve($x_oid->[1]); |
226 | next if (!exists($OIDs{$raw_oid})); |
227 | my $x_type = $OIDs{$raw_oid}; |
228 | |
229 | my $raw_value = asn1_retrieve($x_val->[1]); |
230 | |
231 | if ($x_type eq "subjectKeyIdentifier") { |
232 | my $vcursor = [ 0, length($raw_value), \$raw_value ]; |
233 | |
234 | $subject_key_id = asn1_extract($vcursor, $UNIV | $OCTET_STRING); |
235 | } |
236 | } |
237 | } |
238 | |
239 | ############################################################################### |
240 | # |
241 | # Determine what we're going to use as the signer's name. In order of |
242 | # preference, take one of: commonName, organizationName or emailAddress. |
243 | # |
244 | ############################################################################### |
245 | my $org = ""; |
246 | my $cn = ""; |
247 | my $email = ""; |
248 | |
249 | while ($subject->[1]->[1] > 0) { |
250 | my $rdn = asn1_extract($subject->[1], $UNIV | $CONS | $SET); |
251 | my $attr = asn1_extract($rdn->[1], $UNIV | $CONS | $SEQUENCE); |
252 | my $n_oid = asn1_extract($attr->[1], $UNIV | $OBJ_ID); |
253 | my $n_val = asn1_extract($attr->[1], -1); |
254 | |
255 | my $raw_oid = asn1_retrieve($n_oid->[1]); |
256 | next if (!exists($OIDs{$raw_oid})); |
257 | my $n_type = $OIDs{$raw_oid}; |
258 | |
259 | my $raw_value = asn1_retrieve($n_val->[1]); |
260 | |
261 | if ($n_type eq "organizationName") { |
262 | $org = $raw_value; |
263 | } elsif ($n_type eq "commonName") { |
264 | $cn = $raw_value; |
265 | } elsif ($n_type eq "emailAddress") { |
266 | $email = $raw_value; |
267 | } |
268 | } |
269 | |
270 | my $signers_name = $email; |
271 | |
272 | if ($org && $cn) { |
273 | # Don't use the organizationName if the commonName repeats it |
274 | if (length($org) <= length($cn) && |
275 | substr($cn, 0, length($org)) eq $org) { |
276 | $signers_name = $cn; |
277 | goto got_id_name; |
278 | } |
279 | |
280 | # Or a signifcant chunk of it |
281 | if (length($org) >= 7 && |
282 | length($cn) >= 7 && |
283 | substr($cn, 0, 7) eq substr($org, 0, 7)) { |
284 | $signers_name = $cn; |
285 | goto got_id_name; |
286 | } |
287 | |
288 | $signers_name = $org . ": " . $cn; |
289 | } elsif ($org) { |
290 | $signers_name = $org; |
291 | } elsif ($cn) { |
292 | $signers_name = $cn; |
293 | } |
294 | |
295 | got_id_name: |
296 | |
297 | die $x509, ": ", "X.509: Couldn't find the Subject Key Identifier extension\n" |
298 | if (!$subject_key_id); |
299 | |
300 | my $key_identifier = asn1_retrieve($subject_key_id->[1]); |
301 | |
302 | ############################################################################### |
303 | # |
304 | # Create and attach the module signature |
305 | # |
306 | ############################################################################### |
307 | |
308 | # |
309 | # Signature parameters |
310 | # |
311 | my $algo = 1; # Public-key crypto algorithm: RSA |
312 | my $hash = 0; # Digest algorithm |
313 | my $id_type = 1; # Identifier type: X.509 |
314 | |
315 | # |
316 | # Digest the data |
317 | # |
318 | my $prologue; |
319 | if ($dgst eq "sha1") { |
320 | $prologue = pack("C*", |
321 | 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, |
322 | 0x2B, 0x0E, 0x03, 0x02, 0x1A, |
323 | 0x05, 0x00, 0x04, 0x14); |
324 | $hash = 2; |
325 | } elsif ($dgst eq "sha224") { |
326 | $prologue = pack("C*", |
327 | 0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, |
328 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, |
329 | 0x05, 0x00, 0x04, 0x1C); |
330 | $hash = 7; |
331 | } elsif ($dgst eq "sha256") { |
332 | $prologue = pack("C*", |
333 | 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, |
334 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, |
335 | 0x05, 0x00, 0x04, 0x20); |
336 | $hash = 4; |
337 | } elsif ($dgst eq "sha384") { |
338 | $prologue = pack("C*", |
339 | 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, |
340 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, |
341 | 0x05, 0x00, 0x04, 0x30); |
342 | $hash = 5; |
343 | } elsif ($dgst eq "sha512") { |
344 | $prologue = pack("C*", |
345 | 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, |
346 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, |
347 | 0x05, 0x00, 0x04, 0x40); |
348 | $hash = 6; |
349 | } else { |
350 | die "Unknown hash algorithm: $dgst\n"; |
351 | } |
352 | |
353 | my $signature; |
354 | if ($signature_file) { |
355 | $signature = read_file($signature_file); |
356 | } else { |
357 | # |
358 | # Generate the digest and read from openssl's stdout |
359 | # |
360 | my $digest; |
361 | $digest = readpipe("openssl dgst -$dgst -binary $module") || die "openssl dgst"; |
362 | |
363 | # |
364 | # Generate the binary signature, which will be just the integer that |
365 | # comprises the signature with no metadata attached. |
366 | # |
367 | my $pid; |
368 | $pid = open2(*read_from, *write_to, |
369 | "openssl rsautl -sign -inkey $private_key -keyform PEM") || |
370 | die "openssl rsautl"; |
371 | binmode write_to; |
372 | print write_to $prologue . $digest || die "pipe to openssl rsautl"; |
373 | close(write_to) || die "pipe to openssl rsautl"; |
374 | |
375 | binmode read_from; |
376 | read(read_from, $signature, 4096) || die "pipe from openssl rsautl"; |
377 | close(read_from) || die "pipe from openssl rsautl"; |
378 | waitpid($pid, 0) || die; |
379 | die "openssl rsautl died: $?" if ($? >> 8); |
380 | } |
381 | $signature = pack("n", length($signature)) . $signature, |
382 | |
383 | # |
384 | # Build the signed binary |
385 | # |
386 | my $unsigned_module = read_file($module); |
387 | |
388 | my $magic_number = "~Module signature appended~\n"; |
389 | |
390 | my $info = pack("CCCCCxxxN", |
391 | $algo, $hash, $id_type, |
392 | length($signers_name), |
393 | length($key_identifier), |
394 | length($signature)); |
395 | |
396 | if ($verbose) { |
397 | print "Size of unsigned module: ", length($unsigned_module), "\n"; |
398 | print "Size of signer's name : ", length($signers_name), "\n"; |
399 | print "Size of key identifier : ", length($key_identifier), "\n"; |
400 | print "Size of signature : ", length($signature), "\n"; |
401 | print "Size of informaton : ", length($info), "\n"; |
402 | print "Size of magic number : ", length($magic_number), "\n"; |
403 | print "Signer's name : '", $signers_name, "'\n"; |
404 | print "Digest : $dgst\n"; |
405 | } |
406 | |
407 | open(FD, ">$dest") || die $dest; |
408 | binmode FD; |
409 | print FD |
410 | $unsigned_module, |
411 | $signers_name, |
412 | $key_identifier, |
413 | $signature, |
414 | $info, |
415 | $magic_number |
416 | ; |
417 | close FD || die $dest; |
418 | |
419 | if (!$keep_orig) { |
420 | rename($dest, $module) || die $module; |
421 | } |
422 |
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