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Comment:Added debugging to ASN.1 X.509 parser, added support for gzip'd certificates, and fixed a possible non-deterministic case with realloc(0)
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SHA1: e4a2e1c560669c0c471c79e1aea995a3f165289c
User & Date: rkeene on 2015-03-05 15:48:58
Other Links: manifest | tags
Context
2015-03-05
16:06
Updated to deal with reading impossibly small TLV buffers sanely check-in: 614742ca67 user: rkeene tags: trunk
15:48
Added debugging to ASN.1 X.509 parser, added support for gzip'd certificates, and fixed a possible non-deterministic case with realloc(0) check-in: e4a2e1c560 user: rkeene tags: trunk
2014-10-21
23:01
Updated email addresses, cleaned up Mac OS X build script, and modified the Mac OS X build script to work on a build host running Mac OS X 10.10 (Yosemite). check-in: f44c5c32ff user: kvanals tags: trunk
Changes
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Modified asn1-x509.c from [e21185aa9d] to [f9aa197383].

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}

static int asn1_x509_read_object(unsigned char *buf, size_t buflen, struct x509_object *outbuf) {
	int read_ret;

	read_ret = asn1_x509_read_asn1_object(buf, buflen, &outbuf->wholething, NULL);
	if (read_ret != 0) {
		CACKEY_DEBUG_PRINTF("Failed at reading the contents from the wrapper")

		return(-1);
	}

	read_ret = asn1_x509_read_asn1_object(outbuf->wholething.contents, outbuf->wholething.size, &outbuf->certificate, NULL);
	if (read_ret != 0) {
		CACKEY_DEBUG_PRINTF("Failed at reading the certificate from the contents");

		return(-1);
	}

	read_ret = asn1_x509_read_asn1_object(outbuf->certificate.contents, outbuf->certificate.size, &outbuf->version, &outbuf->serial_number, &outbuf->signature_algo, &outbuf->issuer, &outbuf->validity, &outbuf->subject, &outbuf->pubkeyinfo, NULL);
	if (read_ret != 0) {
		CACKEY_DEBUG_PRINTF("Failed at reading the certificate components from the certificate");

		return(-1);
	}

	read_ret = asn1_x509_read_asn1_object(outbuf->pubkeyinfo.contents, outbuf->pubkeyinfo.size, &outbuf->pubkey_algoid, &outbuf->pubkey, NULL);
	if (read_ret != 0) {
		CACKEY_DEBUG_PRINTF("Failed at reading the public key from the certificate components");

		return(-1);
	}

	return(0);
}

ssize_t x509_to_issuer(void *x509_der_buf, size_t x509_der_buf_len, void **outbuf) {
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static ssize_t x509_to_serial(void *x509_der_buf, size_t x509_der_buf_len, void **outbuf) {
	struct x509_object x509;
	int read_ret;

	read_ret = asn1_x509_read_object(x509_der_buf, x509_der_buf_len, &x509);
	if (read_ret != 0) {
		CACKEY_DEBUG_PRINTF("Unable to read serial number from a %lu byte buffer", x509_der_buf_len);
		CACKEY_DEBUG_PRINTBUF("X.509 DER:", x509_der_buf, x509_der_buf_len);

		return(-1);
	}

	if (outbuf) {
		*outbuf = x509.serial_number.asn1rep;
	}
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Modified cackey.c from [fd9c15d1e5] to [7a1e8d322f].

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#include "pkcs11.h"
#include "pkcs11n.h"
#include "asn1-x509.h"
#include "sha1.h"
#include "md5.h"

/*
 * Include these source files in this translation unit so that we can bind to
 * functions and not include any symbols in the output shared object.
 */
#include "asn1-x509.c"
#include "sha1.c"
#include "md5.c"

#ifndef CACKEY_CRYPTOKI_VERSION_CODE
#  define CACKEY_CRYPTOKI_VERSION_CODE 0x021e00
#endif

/* GSC-IS v2.1 Definitions */
/** Classes **/
#define GSCIS_CLASS_ISO7816           0x00
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#  define CACKEY_DEBUG_PRINTBUF(f, x, y) { \
	static char buf_user[4096] = {0}, *buf_user_p; \
	unsigned long buf_user_size; \
	unsigned char *TMPBUF; \
	unsigned long idx; \
	int snprintf_ret; \
	TMPBUF = (unsigned char *) (x); \
	buf_user[0] = 0; \
	buf_user_p = buf_user; \
	buf_user_size = sizeof(buf_user); \
	for (idx = 1; idx < (y); idx++) { \
		if (buf_user_size <= 0) { \
			break; \
		}; \
		snprintf_ret = snprintf(buf_user_p, buf_user_size, ", %02x", TMPBUF[idx]); \
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#  define CACKEY_DEBUG_FUNC_TAG_TO_STR(x) "DEBUG_DISABLED"
#  define CACKEY_DEBUG_FUNC_SCARDERR_TO_STR(x) "DEBUG_DISABLED"
#  define CACKEY_DEBUG_FUNC_OBJID_TO_STR(x) "DEBUG_DISABLED"
#  define CACKEY_DEBUG_FUNC_APPTYPE_TO_STR(x) "DEBUG_DISABLED"
#  define CACKEY_DEBUG_FUNC_ATTRIBUTE_TO_STR(x) "DEBUG_DISABLED"
#endif

/*
 * Include these source files in this translation unit so that we can bind to
 * functions and not include any symbols in the output shared object.
 */
#include "asn1-x509.c"
#include "sha1.c"
#include "md5.c"

typedef enum {
	CACKEY_ID_TYPE_CAC,
	CACKEY_ID_TYPE_PIV,
	CACKEY_ID_TYPE_CERT_ONLY
} cackey_pcsc_id_type;

struct cackey_pcsc_identity {
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		CACKEY_DEBUG_PRINTF("Connection to PC/SC failed, returning in failure");

		return(CACKEY_PCSC_E_GENERIC);
	}

	/* Connect to reader, if needed */
	if (!slot->pcsc_card_connected) {
		CACKEY_DEBUG_PRINTF("SCardConnect(%s) called", slot->pcsc_reader);
		CACKEY_DEBUG_PRINTF("SCardConnect(%s) called for slot %p", slot->pcsc_reader, slot);
		scard_conn_ret = SCardConnect(*cackey_pcsc_handle, slot->pcsc_reader, SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1, &slot->pcsc_card, &protocol);

		if (scard_conn_ret == SCARD_E_PROTO_MISMATCH) {
			CACKEY_DEBUG_PRINTF("SCardConnect() returned SCARD_E_PROTO_MISMATCH, trying with just T=0")
			scard_conn_ret = SCardConnect(*cackey_pcsc_handle, slot->pcsc_reader, SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0, &slot->pcsc_card, &protocol);

			if (scard_conn_ret == SCARD_E_PROTO_MISMATCH) {
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 */
static struct cackey_pcsc_identity *cackey_read_certs(struct cackey_slot *slot, struct cackey_pcsc_identity *certs, unsigned long *count) {
	struct cackey_pcsc_identity *curr_id;
	struct cackey_tlv_entity *ccc_tlv, *ccc_curr, *app_tlv, *app_curr;
	unsigned char ccc_aid[] = {GSCIS_AID_CCC}, piv_aid[] = {NISTSP800_73_3_PIV_AID};
	unsigned char *piv_oid, piv_oid_pivauth[] = {NISTSP800_73_3_OID_PIVAUTH}, piv_oid_signature[] = {NISTSP800_73_3_OID_SIGNATURE}, piv_oid_keymgt[] = {NISTSP800_73_3_OID_KEYMGT};
	unsigned char curr_aid[7];
	unsigned char buffer[8192], *buffer_p;
	unsigned char buffer[8192], *buffer_p, *tmpbuf;
	unsigned long outidx = 0;
	char *piv_label;
	cackey_ret transaction_ret;
	ssize_t read_ret;
	size_t buffer_len;
	size_t buffer_len, tmpbuflen;
	int certs_resizable;
	int send_ret, select_ret;
	int piv_key, piv = 0;
	int idx;
#ifdef HAVE_LIBZ
	int uncompress_ret;
	z_stream gzip_stream;
#endif

	CACKEY_DEBUG_PRINTF("Called.");

	if (count == NULL) {
		CACKEY_DEBUG_PRINTF("count is NULL, returning in failure");

		return(NULL);
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			curr_id->certificate = malloc(curr_id->certificate_len);

			buffer_len = sizeof(buffer);
			buffer_p = cackey_read_bertlv_tag(buffer, &buffer_len, 0x70, curr_id->certificate, &curr_id->certificate_len);

			if (buffer_p == NULL) {
				CACKEY_DEBUG_PRINTF("Reading certificate from BER-TLV response failed, skipping key %i", idx);

				free(curr_id->certificate);

				curr_id->certificate = NULL;

				outidx--;

				continue;
			}

#ifdef HAVE_LIBZ
			if (curr_id->certificate_len > 4) {
				if (memcmp(curr_id->certificate, "\x1f\x8b\x08\x00", 4) == 0) {
					tmpbuflen = curr_id->certificate_len * 2;
					tmpbuf = malloc(tmpbuflen);

					CACKEY_DEBUG_PRINTBUF("Attempting to decompress:", curr_id->certificate, curr_id->certificate_len);

					gzip_stream.zalloc = NULL;
					gzip_stream.zfree = NULL;
					gzip_stream.opaque = NULL;

					gzip_stream.next_in  = curr_id->certificate;
					gzip_stream.avail_in = curr_id->certificate_len;
					gzip_stream.next_out = tmpbuf;
					gzip_stream.avail_out = tmpbuflen;

					uncompress_ret = inflateInit(&gzip_stream);
					if (uncompress_ret == Z_OK) {
						uncompress_ret = inflateReset2(&gzip_stream, 31);
					}
					if (uncompress_ret == Z_OK) {
						uncompress_ret = inflate(&gzip_stream, 0);
					}
					if (uncompress_ret == Z_STREAM_END) {
						uncompress_ret = inflateEnd(&gzip_stream);
					} else {
						uncompress_ret = Z_DATA_ERROR;
					}
					if (uncompress_ret == Z_OK) {
						CACKEY_DEBUG_PRINTBUF("Decompressed to:", tmpbuf, tmpbuflen);

						free(curr_id->certificate);

						curr_id->certificate = tmpbuf;
						curr_id->certificate_len = tmpbuflen;
					} else {
						CACKEY_DEBUG_PRINTF("Decompressing failed! uncompress() returned %i", uncompress_ret);

						free(tmpbuf);
					}
				}
			}
#endif
		}
	} else {
		/* Read all the applets from the CCC's TLV */
		ccc_tlv = cackey_read_tlv(slot);

		/* Look for CARDURLs that coorespond to PKI applets */
		for (ccc_curr = ccc_tlv; ccc_curr; ccc_curr = ccc_curr->_next) {
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				curr_id->certificate = malloc(curr_id->certificate_len);
				memcpy(curr_id->certificate, app_curr->value, curr_id->certificate_len);

				if (outidx >= *count) {
					if (certs_resizable) {
						*count *= 2;
						if (*count != 0) {
						certs = realloc(certs, sizeof(*certs) * (*count));
							certs = realloc(certs, sizeof(*certs) * (*count));
						} else {
							certs = NULL;
						}
					} else {
						break;
					}
				}
			}

			cackey_free_tlv(app_tlv);

			if (outidx >= *count) {
				break;
			}
		}

		cackey_free_tlv(ccc_tlv);
	}

	*count = outidx;

	if (certs_resizable) {
		if (*count != 0) {
		certs = realloc(certs, sizeof(*certs) * (*count));
			certs = realloc(certs, sizeof(*certs) * (*count));
		} else {
			certs = NULL;
		}
	}

	slot->cached_certs = cackey_copy_certs(NULL, certs, *count);
	slot->cached_certs_count = *count;

	/* Terminate SmartCard Transaction */
	cackey_end_transaction(slot);
︙

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