james/yubikey.rs
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lib: define constant for max pin len magic numbers

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lib: clear pin buffers when no longer used
This commit is contained in:
Dave Pate
2019-01-07 15:50:18 -08:00
committed by Klas Lindfors
parent eb250134f8
commit 934120888f
3 changed files with 31 additions and 15 deletions
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lib/internal.c
+2
View File
@@ -462,6 +462,8 @@ pkcs5_rc pkcs5_pbkdf2_sha1(const uint8_t* password, const size_t cb_password, co
*/
if (STATUS_SUCCESS == BCryptOpenAlgorithmProvider(&hAlg, BCRYPT_SHA1_ALGORITHM, NULL, BCRYPT_ALG_HANDLE_HMAC_FLAG)) {
/* suppress const qualifier warning b/c BCrypt doesn't take const input buffers */
#pragma warning(suppress: 4090)
if (STATUS_SUCCESS != BCryptDeriveKeyPBKDF2(hAlg, (PUCHAR)password, (ULONG)cb_password, (PUCHAR)salt, (ULONG)cb_salt, iterations, key, (ULONG)cb_key, 0)) {
rc = PKCS5_GENERAL_ERROR;
}
lib/internal.h
+1
View File
@@ -126,6 +126,7 @@ extern "C"
#define CB_OBJ_TAG_MIN 2 // 1 byte tag + 1 byte len
#define CB_OBJ_TAG_MAX (CB_OBJ_TAG_MIN + 2) // 1 byte tag + 3 bytes len
#define CB_PIN_MAX 8
#define member_size(type, member) sizeof(((type*)0)->member)
typedef enum {
lib/ykpiv.c
+28 -15
View File
@@ -1246,6 +1246,7 @@ static ykpiv_rc _cache_pin(ykpiv_state *state, const char *pin, size_t len) {
return YKPIV_OK;
}
if (state->pin) {
yc_memzero(state->pin, strnlen(state->pin, CB_PIN_MAX));
_ykpiv_free(state, state->pin);
state->pin = NULL;
}
@@ -1268,7 +1269,7 @@ static ykpiv_rc _verify(ykpiv_state *state, const char *pin, const size_t pin_le
int sw;
ykpiv_rc res;
if (pin_len > 8) {
if (pin_len > CB_PIN_MAX) {
return YKPIV_SIZE_ERROR;
}
@@ -1279,27 +1280,36 @@ static ykpiv_rc _verify(ykpiv_state *state, const char *pin, const size_t pin_le
apdu.st.lc = pin ? 0x08 : 0;
if (pin) {
memcpy(apdu.st.data, pin, pin_len);
if (pin_len < 8) {
memset(apdu.st.data + pin_len, 0xff, 8 - pin_len);
if (pin_len < CB_PIN_MAX) {
memset(apdu.st.data + pin_len, 0xff, CB_PIN_MAX - pin_len);
}
}
if ((res = _send_data(state, &apdu, data, &recv_len, &sw)) != YKPIV_OK) {
res = _send_data(state, &apdu, data, &recv_len, &sw);
yc_memzero(&apdu, sizeof(apdu));
if (res != YKPIV_OK) {
return res;
} else if (sw == SW_SUCCESS) {
}
else if (sw == SW_SUCCESS) {
if (pin && pin_len) {
// Intentionally ignore errors. If the PIN fails to save, it will only
// be a problem if a reconnect is attempted. Failure deferred until then.
_cache_pin(state, pin, pin_len);
}
if (tries) *tries = (sw & 0xf);
return YKPIV_OK;
} else if ((sw >> 8) == 0x63) {
}
else if ((sw >> 8) == 0x63) {
if (tries) *tries = (sw & 0xf);
return YKPIV_WRONG_PIN;
} else if (sw == SW_ERR_AUTH_BLOCKED) {
}
else if (sw == SW_ERR_AUTH_BLOCKED) {
if (tries) *tries = 0;
return YKPIV_WRONG_PIN;
} else {
}
else {
return YKPIV_GENERIC_ERROR;
}
}
@@ -1385,10 +1395,10 @@ static ykpiv_rc _ykpiv_change_pin(ykpiv_state *state, int action, const char * c
unsigned char data[0xff];
unsigned long recv_len = sizeof(data);
ykpiv_rc res;
if (current_pin_len > 8) {
if (current_pin_len > CB_PIN_MAX) {
return YKPIV_SIZE_ERROR;
}
if (new_pin_len > 8) {
if (new_pin_len > CB_PIN_MAX) {
return YKPIV_SIZE_ERROR;
}
if(action == CHREF_ACT_UNBLOCK_PIN) {
@@ -1398,14 +1408,17 @@ static ykpiv_rc _ykpiv_change_pin(ykpiv_state *state, int action, const char * c
templ[3] = 0x81;
}
memcpy(indata, current_pin, current_pin_len);
if(current_pin_len < 8) {
memset(indata + current_pin_len, 0xff, 8 - current_pin_len);
if(current_pin_len < CB_PIN_MAX) {
memset(indata + current_pin_len, 0xff, CB_PIN_MAX - current_pin_len);
}
memcpy(indata + 8, new_pin, new_pin_len);
if(new_pin_len < 8) {
memset(indata + 8 + new_pin_len, 0xff, 8 - new_pin_len);
memcpy(indata + CB_PIN_MAX, new_pin, new_pin_len);
if(new_pin_len < CB_PIN_MAX) {
memset(indata + CB_PIN_MAX + new_pin_len, 0xff, CB_PIN_MAX - new_pin_len);
}
res = ykpiv_transfer_data(state, templ, indata, sizeof(indata), data, &recv_len, &sw);
yc_memzero(indata, sizeof(indata));
if(res != YKPIV_OK) {
return res;
} else if(sw != SW_SUCCESS) {