#include "serial.h"
#include "crypto.h"
#include "authobj.h"
+#include "pcsc_cr.h"
-int make_authobj(const char *id, const char *pass, const char *nonce,
+struct _hash_obj {
+ const char *err;
+ unsigned char hash[HASHSIZE];
+};
+
+static struct _hash_obj
+make_challenge(const char *uid, const char *pass, const char *nonce)
+{
+ struct _hash_obj ho = {0};
+ unsigned long rc;
+ serializer_t srl;
+ int datasize = strlen(uid) + strlen(pass) + strlen(nonce) +
+ 4 * sizeof(short);
+ unsigned char *data = alloca(datasize);
+ int hashsize = sizeof(ho.hash);
+
+ serial_init(&srl, data, datasize);
+ if (serial_put(&srl, uid, strlen(uid)) != strlen(uid)) {
+ ho.err = "challenge: serialization of uid failed";
+ } else if (serial_put(&srl, pass, strlen(pass)) != strlen(pass)) {
+ ho.err = "challenge: serialization of pass failed";
+ } else if (serial_put(&srl, nonce, strlen(nonce)) != strlen(nonce)) {
+ ho.err = "challenge: serialization of nonce failed";
+ } else if (serial_put(&srl, NULL, 0) != 0) {
+ ho.err = "challenge: serialization of terminator failed";
+ }
+ if (!ho.err) {
+ if ((rc = hash(data, serial_size(&srl), &ho.hash, &hashsize))) {
+ ho.err = crypto_errstr(rc);
+ } else if (hashsize != sizeof(ho.hash)) {
+ ho.err = "challenge: hash size is wrong";
+ }
+ }
+ memset(data, 0, datasize);
+ return ho;
+}
+
+static struct _hash_obj
+make_key(const unsigned char *challenge, const int challengesize,
+ const unsigned char *secret, const int secsize)
+{
+ struct _hash_obj ho = {0};
+ unsigned long rc;
+ int keysize = sizeof(ho.hash);
+
+ if ((rc = hmac(secret, secsize, challenge, challengesize,
+ &ho.hash, &keysize))) {
+ ho.err = crypto_errstr(rc);
+ } else if (keysize != sizeof(ho.hash)) {
+ ho.err = "make_key: hash size is wrong";
+ }
+ return ho;
+}
+
+static struct _hash_obj
+fetch_key(const unsigned char *challenge, const int challengesize)
+{
+ struct _hash_obj ho = {0};
+ long rc;
+ int keysize = sizeof(ho.hash);
+
+ if ((rc = pcsc_cr(challenge, challengesize, ho.hash, &keysize))) {
+ ho.err = pcsc_errstr(rc);
+ }
+ return ho;
+}
+
+static struct _auth_obj
+make_authobj(const unsigned char *key, const int keysize,
const unsigned char *secret, const int secsize,
- const unsigned char *payload, const int paysize,
- unsigned char *buffer, int *bufsize)
+ const unsigned char *payload, const int paysize)
{
+ struct _auth_obj ao = {0};
+ unsigned long rc;
unsigned char *data;
int datasize;
unsigned char datahash[HASHSIZE];
int datahashsize = HASHSIZE;
- unsigned char *hmacdata;
- int hmacdatasize;
- unsigned char key[HASHSIZE];
- int keysize = HASHSIZE;
serializer_t srl;
- datasize = ((secsize + paysize + HASHSIZE * 4 * sizeof(short) - 1) /
+ if (keysize < CBLKSIZE) {
+ ao.err = "make authobj: key too short";
+ return ao;
+ }
+ datasize = ((secsize + paysize + HASHSIZE + 4 * sizeof(short) - 1) /
CBLKSIZE + 1) * CBLKSIZE;
data = alloca(datasize);
- if (serial_init(&srl, data, datasize)) return -1;
- if (serial_put(&srl, secret, secsize) != secsize) return -1;
- if (serial_put(&srl, payload, paysize) != paysize) return -1;
- if (hash(data, serial_size(&srl), datahash, &datahashsize))
- return -1;
- if (serial_put(&srl, datahash, datahashsize) != datahashsize)
- return -1;
- if (serial_put(&srl, NULL, 0) != 0) return -1;
- datasize = ((serial_size(&srl) -1) / CBLKSIZE + 1) * CBLKSIZE;
-
- hmacdatasize = ((strlen(id) + strlen(pass) + strlen(nonce) +
- 4 * sizeof(short) - 1) / CBLKSIZE + 1) * CBLKSIZE;
- hmacdata = alloca(hmacdatasize);
- if (serial_init(&srl, hmacdata, hmacdatasize)) return -1;
- if (serial_put(&srl, id, strlen(id)) != strlen(id)) return -1;
- if (serial_put(&srl, pass, strlen(pass)) != strlen(pass)) return -1;
- if (serial_put(&srl, nonce, strlen(nonce)) != strlen(nonce)) return -1;
- if (serial_put(&srl, NULL, 0) != 0) return -1;
- hmacdatasize = ((serial_size(&srl) -1) / CBLKSIZE + 1) * CBLKSIZE;
-
- if (hmac(secret, secsize, hmacdata, hmacdatasize,
- key, &keysize)) return -1;
-
- if (*bufsize < datasize) return -1;
- *bufsize = datasize;
- if (encrypt(key, keysize, data, buffer, datasize)) return -1;
-
- return 0;
+ serial_init(&srl, data, datasize);
+ if (serial_put(&srl, secret, secsize) != secsize) {
+ ao.err = "authobj: serialization of secret failed";
+ } else if (serial_put(&srl, payload, paysize) != paysize) {
+ ao.err = "authobj: serialization of payload failed";
+ } else if ((rc = hash(data, serial_size(&srl),
+ datahash, &datahashsize))) {
+ ao.err = crypto_errstr(rc);
+ } else if (serial_put(&srl, datahash, datahashsize) != datahashsize) {
+ ao.err = "authobj: serialization of hash failed";
+ } else if (serial_put(&srl, NULL, 0) != 0) {
+ ao.err = "authobj: serialization of terminator failed";
+ }
+
+ if (!ao.err) {
+ unsigned long lrc;
+ int osize = ((serial_size(&srl) -1) / CBLKSIZE + 1) * CBLKSIZE;
+
+ if ((ao.buffer = malloc(osize + paysize)) == NULL) {
+ ao.err = "make authobj: malloc failed";
+ } else if ((lrc = encrypt(key, CBLKSIZE, data,
+ ao.buffer, osize))) {
+ ao.err = crypto_errstr(lrc);
+ } else {
+ ao.data = ao.buffer;
+ ao.datasize = osize;
+ if (payload && paysize) {
+ /* payload passthrough */
+ ao.payload = ao.data + osize;
+ memcpy(ao.payload, payload, paysize);
+ ao.paylsize = paysize;
+ }
+ }
+ }
+
+ memset(data, 0, datasize);
+ return ao;
}
-int parse_authobj(const unsigned char *hmacdata, const int hmacdatasize,
- const unsigned char *buffer, const int bufsize,
- unsigned char *secret, int *secsize,
- unsigned char *payload, int *paysize)
+static struct _auth_obj
+parse_authobj(const unsigned char *key, const int keysize,
+ const unsigned char *buffer, const int bufsize)
{
- int datasize = bufsize;
- unsigned char *data = alloca(datasize);
- serializer_t srl;
- int tsize;
- unsigned char myhash[HASHSIZE];
- int myhashsize = HASHSIZE;
- unsigned char theirhash[HASHSIZE];
- int theirhashsize = HASHSIZE;
-
- if (decrypt(hmacdata, hmacdatasize, buffer, data, datasize))
- return -1;
- if (serial_init(&srl, data, datasize)) return -1;
- tsize = *secsize;
- if ((*secsize = serial_get(&srl, secret, tsize)) > tsize) return -1;
- tsize = *paysize;
- if ((*paysize = serial_get(&srl, payload, tsize)) > tsize) return -1;
- if (hash(data, serial_size(&srl), myhash, &myhashsize))
- return -1;
- if ((theirhashsize = serial_get(&srl, theirhash, theirhashsize)) != HASHSIZE)
- return -1;
- if ((myhashsize != theirhashsize) ||
- memcmp(myhash, theirhash, myhashsize))
- return -1;
- return 0;
+ unsigned long rc;
+ struct _auth_obj ao = {0};
+
+ if (keysize < CBLKSIZE) {
+ ao.err = "parse authobj: key too short";
+ } else if ((ao.buffer = malloc(bufsize)) == NULL) {
+ ao.err = "parse authobj: malloc failed";
+ } else if ((rc = decrypt(key, CBLKSIZE, buffer, ao.buffer, bufsize))) {
+ ao.err = crypto_errstr(rc);
+ } else {
+ serializer_t srl;
+ unsigned char myhash[HASHSIZE];
+ int myhsize = HASHSIZE;
+ unsigned char *theirhash;
+ int theirhsize;
+ unsigned long rc;
+
+ serial_init(&srl, ao.buffer, bufsize);
+ if (serial_get(&srl, (void**)&ao.data, &ao.datasize)) {
+ ao.err = "mismatch: impossible secret";
+ } else if (serial_get(&srl, (void**)&ao.payload, &ao.paylsize)) {
+ ao.err = "mismatch: impossible payload";
+ } else if ((rc = hash(ao.buffer, serial_size(&srl),
+ myhash, &myhsize))) {
+ ao.err = crypto_errstr(rc);
+ } else if (serial_get(&srl, (void**)&theirhash, &theirhsize)) {
+ ao.err = "mismatch: impossible hash";
+ } else if (theirhsize != HASHSIZE) {
+ ao.err = "mismatch: hash is of wrong size";
+ } else if ((myhsize != theirhsize) ||
+ memcmp(myhash, theirhash, myhsize)) {
+ ao.err = "mismatch: different hash";
+ }
+ }
+ return ao;
+}
+
+struct _auth_obj new_authobj(const char *userid, const char *password,
+ const char *nonce,
+ const unsigned char *secret, const int secsize,
+ const unsigned char *payload, const int paysize)
+{
+ struct _auth_obj new_ao = {0};
+ struct _hash_obj ho_chal, ho_key;
+
+ ho_chal = make_challenge(userid, password, nonce);
+ if (ho_chal.err) {
+ new_ao.err = ho_chal.err;
+ return new_ao;
+ }
+ ho_key = make_key(ho_chal.hash, sizeof(ho_chal.hash), secret, secsize);
+ memset(&ho_chal, 0, sizeof(ho_chal));
+ if (ho_key.err) {
+ new_ao.err = ho_key.err;
+ return new_ao;
+ }
+ new_ao = make_authobj(ho_key.hash, sizeof(ho_key.hash),
+ secret, secsize, payload, paysize);
+ memset(&ho_key, 0, sizeof(ho_key));
+ return new_ao;
+}
+
+struct _auth_obj verify_authobj(const char *userid, const char *password,
+ const char *oldnonce, const char *newnonce,
+ const unsigned char *authobj, const int authsize)
+{
+ struct _auth_obj old_ao;
+ struct _auth_obj new_ao = {0};
+ struct _hash_obj ho_chal, ho_key;
+
+ ho_chal = make_challenge(userid, password, oldnonce);
+ if (ho_chal.err) {
+ new_ao.err = ho_chal.err;
+ return new_ao;
+ }
+ ho_key = fetch_key(ho_chal.hash, sizeof(ho_chal.hash));
+ memset(&ho_chal, 0, sizeof(ho_chal));
+ if (ho_key.err) {
+ new_ao.err = ho_key.err;
+ return new_ao;
+ }
+ old_ao = parse_authobj(ho_key.hash, sizeof(ho_key.hash),
+ authobj, authsize);
+ memset(&ho_key, 0, sizeof(ho_key));
+ if (old_ao.err) {
+ new_ao.err = old_ao.err;
+ if (old_ao.buffer) free(old_ao.buffer);
+ return new_ao;
+ }
+
+ ho_chal = make_challenge(userid, password, newnonce);
+ if (ho_chal.err) {
+ new_ao.err = ho_chal.err;
+ return new_ao;
+ }
+ ho_key = make_key(ho_chal.hash, sizeof(ho_chal.hash),
+ old_ao.data, old_ao.datasize);
+ memset(&ho_chal, 0, sizeof(ho_chal));
+ if (ho_key.err) {
+ new_ao.err = ho_key.err;
+ return new_ao;
+ }
+ new_ao = make_authobj(ho_key.hash, sizeof(ho_key.hash),
+ old_ao.data, old_ao.datasize,
+ old_ao.payload, old_ao.paylsize);
+ memset(&ho_key, 0, sizeof(ho_key));
+
+ if (old_ao.data) memset(old_ao.data, 0, old_ao.datasize);
+ if (old_ao.payload) memset(old_ao.payload, 0, old_ao.paylsize);
+ if (old_ao.buffer) free(old_ao.buffer);
+ return new_ao;
+}
+
+struct _auth_obj reload_authobj(const char *userid, const char *password,
+ const char *oldnonce, const char *newnonce,
+ const unsigned char *authobj, const int authsize,
+ const unsigned char *payload, const int paysize)
+{
+ struct _auth_obj old_ao;
+ struct _auth_obj new_ao = {0};
+ struct _hash_obj ho_chal, ho_key;
+
+ ho_chal = make_challenge(userid, password, oldnonce);
+ if (ho_chal.err) {
+ new_ao.err = ho_chal.err;
+ return new_ao;
+ }
+ ho_key = fetch_key(ho_chal.hash, sizeof(ho_chal.hash));
+ memset(&ho_chal, 0, sizeof(ho_chal));
+ if (ho_key.err) {
+ new_ao.err = ho_key.err;
+ return new_ao;
+ }
+ memset(&ho_key, 0, sizeof(ho_key));
+ return new_ao;
}
projects / pam_pcsc_cr.git / blobdiff