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MSI: add support for extracting signatures.

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Mikkel Krautz 2013-05-01 01:17:30 +02:00 committed by Per Allansson
parent bb65ac4d42
commit 30ee6536c4
1 changed files with 75 additions and 1 deletions
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76
osslsigncode.c
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@ -1455,6 +1455,77 @@ out:
return ret; return ret;
} }
/*
* msi_extract_signature extracts the MSI DigitalSignaure from infile
* to a file at the path given by outfile.
*/
static int msi_extract_signature(GsfInfile *infile, char *outfile) {
unsigned char hexbuf[EVP_MAX_MD_SIZE*2+1];
GsfInput *sig = NULL;
GsfInput *exsig = NULL;
unsigned char *exdata = NULL;
unsigned long exlen = 0;
BIO *outdata = NULL;
gchar decoded[0x40];
int i, ret = 0;
for (i = 0; i < gsf_infile_num_children(infile); i++) {
GsfInput *child = gsf_infile_child_by_index(infile, i);
const guint8 *name = (const guint8*)gsf_input_name(child);
msi_decode(name, decoded);
if (!g_strcmp0(decoded, "\05DigitalSignature"))
sig = child;
if (!g_strcmp0(decoded, "\05MsiDigitalSignatureEx"))
exsig = child;
}
if (sig == NULL) {
printf("MSI file has no signature\n\n");
ret = 1;
goto out;
}
/* Create outdata file */
outdata = BIO_new_file(outfile, "w+b");
if (outdata == NULL) {
printf("Unable to open %s\n\n", outfile);
ret = 1;
goto out;
}
while (gsf_input_remaining(sig) > 0) {
gsf_off_t size = MIN(gsf_input_remaining(sig), 4096);
guint8 const *data = gsf_input_read(sig, size, NULL);
BIO_write(outdata, data, size);
}
if (exsig != NULL) {
exlen = (unsigned long) gsf_input_remaining(exsig);
if (exlen > EVP_MAX_MD_SIZE) {
printf("MsiDigitalSignatureEx is larger than EVP_MAX_MD_SIZE. Aborting...\n\n");
ret = 1;
goto out;
}
exdata = malloc(exlen);
if (gsf_input_read(exsig, exlen, exdata) == NULL) {
printf("Unable to read MsiDigitalSignatureEx\n\n");
ret = 1;
goto out;
}
tohex(exdata, hexbuf, exlen);
printf("Note: MSI includes a MsiDigitalSignatureEx section.\n");
printf("MsiDigitalSignatureEx pre-hash: %s\n\n", hexbuf);
}
out:
free(exdata);
if (outdata)
BIO_free_all(outdata);
return ret;
}
#endif #endif
static void calc_pe_digest(BIO *bio, const EVP_MD *md, unsigned char *mdbuf, static void calc_pe_digest(BIO *bio, const EVP_MD *md, unsigned char *mdbuf,
@ -2091,7 +2162,10 @@ int main(int argc, char **argv)
DO_EXIT_1("Error opening file %s", infile); DO_EXIT_1("Error opening file %s", infile);
ole = gsf_infile_msole_new(src, NULL); ole = gsf_infile_msole_new(src, NULL);
if (cmd == CMD_VERIFY) { if (cmd == CMD_EXTRACT) {
ret = msi_extract_signature(ole, outfile);
goto skip_signing;
} else if (cmd == CMD_VERIFY) {
ret = msi_verify_file(ole); ret = msi_verify_file(ole);
goto skip_signing; goto skip_signing;
} }