static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf)
{
CONF *cnf = NULL;
int len;
long errline;
unsigned char *p;
ASN1_TYPE *atyp = NULL;
if (genconf)
{
cnf = NCONF_new(NULL);
if (!NCONF_load(cnf, genconf, &errline))
goto conferr;
if (!genstr)
genstr = NCONF_get_string(cnf, "default", "asn1");
if (!genstr)
{
BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf);
goto err;
}
}
atyp = ASN1_generate_nconf(genstr, cnf);
NCONF_free(cnf);
if (!atyp)
return -1;
len = i2d_ASN1_TYPE(atyp, NULL);
if (len <= 0)
goto err;
if (!BUF_MEM_grow(buf,len))
goto err;
p=(unsigned char *)buf->data;
i2d_ASN1_TYPE(atyp, &p);
ASN1_TYPE_free(atyp);
return len;
conferr:
if (errline > 0)
BIO_printf(bio, "Error on line %ld of config file '%s'\n",
errline, genconf);
else
BIO_printf(bio, "Error loading config file '%s'\n", genconf);
err:
NCONF_free(cnf);
ASN1_TYPE_free(atyp);
return -1;
}
static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf)
{
CONF *cnf = NULL;
int len;
unsigned char *p;
ASN1_TYPE *atyp = NULL;
if (genconf) {
if ((cnf = app_load_config(genconf)) == NULL)
goto err;
if (!genstr)
genstr = NCONF_get_string(cnf, "default", "asn1");
if (!genstr) {
BIO_printf(bio_err, "Can't find 'asn1' in '%s'\n", genconf);
goto err;
}
}
atyp = ASN1_generate_nconf(genstr, cnf);
NCONF_free(cnf);
cnf = NULL;
if (!atyp)
return -1;
len = i2d_ASN1_TYPE(atyp, NULL);
if (len <= 0)
goto err;
if (!BUF_MEM_grow(buf, len))
goto err;
p = (unsigned char *)buf->data;
i2d_ASN1_TYPE(atyp, &p);
ASN1_TYPE_free(atyp);
return len;
err:
NCONF_free(cnf);
ASN1_TYPE_free(atyp);
return -1;
}
/*
* We need to replace a standard chunk of PKCS7 signature with one mandated
* by Authenticode. Problem is, replacing it just like that and then calling
* PKCS7_final() would make OpenSSL segfault somewhere in PKCS7_dataFinal().
* So, instead, we call PKCS7_dataInit(), then put our Authenticode-specific
* data into BIO it returned, then call PKCS7_dataFinal() - which now somehow
* does not panic - and _then_ we replace it in the signature. This technique
* was used in sbsigntool by Jeremy Kerr, and might have originated in
* osslsigncode.
*/
static void
magic(PKCS7 *pkcs7, const char *digest, size_t digest_len)
{
BIO *bio, *t_bio;
ASN1_TYPE *t;
ASN1_STRING *s;
CONF *cnf;
unsigned char *buf, *tmp;
char *digest_hex, *magic_conf, *str;
int len, nid, ok;
digest_hex = bin2hex(digest, digest_len);
/*
* Construct the SpcIndirectDataContent chunk.
*/
nid = OBJ_create("1.3.6.1.4.1.311.2.1.4", NULL, NULL);
asprintf(&magic_conf, magic_fmt, digest_hex);
if (magic_conf == NULL)
err(1, "asprintf");
bio = BIO_new_mem_buf((void *)magic_conf, -1);
if (bio == NULL) {
ERR_print_errors_fp(stderr);
errx(1, "BIO_new_mem_buf(3) failed");
}
cnf = NCONF_new(NULL);
if (cnf == NULL) {
ERR_print_errors_fp(stderr);
errx(1, "NCONF_new(3) failed");
}
ok = NCONF_load_bio(cnf, bio, NULL);
if (ok == 0) {
ERR_print_errors_fp(stderr);
errx(1, "NCONF_load_bio(3) failed");
}
str = NCONF_get_string(cnf, "default", "asn1");
if (str == NULL) {
ERR_print_errors_fp(stderr);
errx(1, "NCONF_get_string(3) failed");
}
t = ASN1_generate_nconf(str, cnf);
if (t == NULL) {
ERR_print_errors_fp(stderr);
errx(1, "ASN1_generate_nconf(3) failed");
}
/*
* We now have our proprietary piece of ASN.1. Let's do
* the actual signing.
*/
len = i2d_ASN1_TYPE(t, NULL);
tmp = buf = calloc(1, len);
if (tmp == NULL)
err(1, "calloc");
i2d_ASN1_TYPE(t, &tmp);
/*
* We now have contents of 't' stuffed into memory buffer 'buf'.
*/
tmp = NULL;
t = NULL;
t_bio = PKCS7_dataInit(pkcs7, NULL);
if (t_bio == NULL) {
ERR_print_errors_fp(stderr);
errx(1, "PKCS7_dataInit(3) failed");
}
BIO_write(t_bio, buf + 2, len - 2);
ok = PKCS7_dataFinal(pkcs7, t_bio);
if (ok == 0) {
ERR_print_errors_fp(stderr);
errx(1, "PKCS7_dataFinal(3) failed");
}
t = ASN1_TYPE_new();
s = ASN1_STRING_new();
ASN1_STRING_set(s, buf, len);
ASN1_TYPE_set(t, V_ASN1_SEQUENCE, s);
PKCS7_set0_type_other(pkcs7->d.sign->contents, nid, t);
}
