* more details.
*
* You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
-#include "keyid.h"
#include "keystructs.h"
#include "ll.h"
#include "mem.h"
* packet stream and reads the packets into a linked list of packets
* ready for parsing as a public key or whatever.
*/
-onak_status_t read_openpgp_stream(int (*getchar_func)(void *ctx, size_t count,
+onak_status_t read_openpgp_stream(size_t (*getchar_func)(void *ctx, size_t count,
void *c),
void *ctx,
struct openpgp_packet_list **packets,
}
while (rc == ONAK_E_OK && (maxnum == 0 || keys < maxnum) &&
- !getchar_func(ctx, 1, &curchar)) {
+ (getchar_func(ctx, 1, &curchar) == 1)) {
if (curchar & 0x80) {
/*
* New packet. Allocate memory for it.
*/
if (curpacket->packet->newformat) {
curpacket->packet->tag = (curchar & 0x3F);
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) == 0) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length = curchar;
if (curpacket->packet->length > 191 &&
curpacket->packet->length < 224) {
- rc = getchar_func(ctx, 1, &curchar);
+ rc = getchar_func(ctx, 1, &curchar) ? ONAK_E_OK : ONAK_E_IO_ERROR;
curpacket->packet->length -= 192;
curpacket->packet->length <<= 8;
curpacket->packet->length += curchar;
rc = ONAK_E_UNSUPPORTED_FEATURE;
} else if (curpacket->packet->length == 255) {
/*
- * 5 byte length; ie 255 followed by 3
+ * 5 byte length; ie 255 followed by 4
* bytes of MSB length.
*/
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length = curchar;
curpacket->packet->length <<= 8;
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length += curchar;
curpacket->packet->length <<= 8;
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length += curchar;
curpacket->packet->length <<= 8;
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->tag = (curchar & 0x3C) >> 2;
switch (curchar & 3) {
case 0:
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length = curchar;
break;
case 1:
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length = curchar;
curpacket->packet->length <<= 8;
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length += curchar;
break;
case 2:
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length =
((unsigned) curchar << 24);
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length +=
(curchar << 16);
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
curpacket->packet->length +=
(curchar << 8);
- if (getchar_func(ctx, 1, &curchar)) {
+ if (getchar_func(ctx, 1, &curchar) != 1) {
rc = ONAK_E_INVALID_PKT;
break;
}
} else {
rc = getchar_func(ctx,
curpacket->packet->length,
- curpacket->packet->data);
+ curpacket->packet->data) ?
+ ONAK_E_OK : ONAK_E_IO_ERROR;
}
}
} else {
rc = ONAK_E_INVALID_PKT;
}
+ if (rc == ONAK_E_OK) {
+ /* Make sure the packet version is sane */
+ switch (curpacket->packet->tag) {
+ case OPENPGP_PACKET_ENCRYPTED_MDC:
+ /* These packets must be v1 */
+ if (curpacket->packet->data[0] != 1) {
+ rc = ONAK_E_INVALID_PKT;
+ }
+ break;
+ case OPENPGP_PACKET_PKSESSIONKEY:
+ case OPENPGP_PACKET_ONEPASSSIG:
+ /* These packets must be v3 */
+ if (curpacket->packet->data[0] != 3) {
+ rc = ONAK_E_INVALID_PKT;
+ }
+ break;
+ case OPENPGP_PACKET_SYMSESSIONKEY:
+ /* These packets must be v4 */
+ if (curpacket->packet->data[0] != 4) {
+ rc = ONAK_E_INVALID_PKT;
+ }
+ break;
+ case OPENPGP_PACKET_SIGNATURE:
+ case OPENPGP_PACKET_SECRETKEY:
+ case OPENPGP_PACKET_PUBLICKEY:
+ /* Must be v2 onwards */
+ if (curpacket->packet->data[0] < 2) {
+ rc = ONAK_E_INVALID_PKT;
+ }
+ break;
+ default:
+ break;
+ }
+ }
}
- /* Trim the last packet if it doesn't actually exist */
- if (packetend != NULL && (*packetend)->packet == NULL) {
- free(*packetend);
- *packetend = NULL;
+ if (packetend != NULL) {
+ if ((*packetend)->packet != NULL) {
+ /* If we got an invalid final packet, discard it. */
+ if ((*packetend)->packet->data != NULL &&
+ rc != ONAK_E_OK) {
+ free((*packetend)->packet->data);
+ (*packetend)->packet->data = NULL;
+ }
+ /* If we didn't get any data, clean it up. */
+ if ((*packetend)->packet->data == NULL) {
+ free((*packetend)->packet);
+ (*packetend)->packet = NULL;
+ }
+ }
+ /* Trim the last packet if it doesn't actually exist */
+ if ((*packetend)->packet == NULL) {
+ free(*packetend);
+ *packetend = NULL;
+ }
}
return (rc);
* This function uses putchar_func to write characters to an OpenPGP
* packet stream from a linked list of packets.
*/
-onak_status_t write_openpgp_stream(int (*putchar_func)(void *ctx, size_t count,
+onak_status_t write_openpgp_stream(size_t (*putchar_func)(void *ctx, size_t count,
void *c),
void *ctx,
struct openpgp_packet_list *packets)
projects / onak.git / blobdiff