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parse full hmac-secret

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This commit is contained in:
Conor Patrick 2019-03-20 16:21:21 -04:00
parent 6098810167
commit 00d86379e5
3 changed files with 117 additions and 25 deletions
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39
fido2/ctap.h
View File

@ -54,6 +54,10 @@
#define CP_getKeyAgreement 0x07
#define CP_getRetries 0x08
#define EXT_HMAC_SECRET_COSE_KEY 0x01
#define EXT_HMAC_SECRET_SALT_ENC 0x02
#define EXT_HMAC_SECRET_SALT_AUTH 0x03
#define RESP_versions 0x1
#define RESP_extensions 0x2
#define RESP_aaguid 0x3
@ -183,7 +187,26 @@ struct rpId
typedef struct
{
uint8_t hmac_secret;
struct{
uint8_t x[32];
uint8_t y[32];
} pubkey;
int kty;
int crv;
} COSE_key;
typedef struct
{
uint8_t saltEnc[64];
uint8_t saltAuth[32];
COSE_key keyAgreement;
} CTAP_hmac_secret;
typedef struct
{
uint8_t hmac_secret_present;
CTAP_hmac_secret hmac_secret;
} CTAP_extensions;
typedef struct
@ -236,22 +259,16 @@ typedef struct
CTAP_credentialDescriptor creds[ALLOW_LIST_MAX_SIZE];
uint8_t allowListPresent;
CTAP_extensions extensions;
} CTAP_getAssertion;
typedef struct
{
int pinProtocol;
int subCommand;
struct
{
struct{
uint8_t x[32];
uint8_t y[32];
} pubkey;
int kty;
int crv;
} keyAgreement;
COSE_key keyAgreement;
uint8_t keyAgreementPresent;
uint8_t pinAuth[16];
uint8_t pinAuthPresent;

101
fido2/ctap_parse.c
View File

@ -556,6 +556,74 @@ uint8_t parse_options(CborValue * val, uint8_t * rk, uint8_t * uv, uint8_t * up)
return 0;
}
uint8_t ctap_parse_hmac_secret(CTAP_hmac_secret * hs, CborValue * val)
{
size_t map_length;
size_t salt_len;
uint8_t parsed_count = 0;
int key;
int ret;
unsigned int i;
CborValue map;
if (cbor_value_get_type(val) != CborMapType)
{
printf2(TAG_ERR,"error, wrong type\n");
return CTAP2_ERR_INVALID_CBOR_TYPE;
}
ret = cbor_value_enter_container(val,&map);
check_ret(ret);
ret = cbor_value_get_map_length(val, &map_length);
check_ret(ret);
for (i = 0; i < map_length; i++)
{
if (cbor_value_get_type(&map) != CborIntegerType)
{
printf2(TAG_ERR,"Error, expecting CborIntegerTypefor hmac-secret map key, got %s\n", cbor_value_get_type_string(&map));
return CTAP2_ERR_INVALID_CBOR_TYPE;
}
ret = cbor_value_get_int(&map, &key);
check_ret(ret);
ret = cbor_value_advance(&map);
check_ret(ret);
switch(key)
{
case EXT_HMAC_SECRET_COSE_KEY:
ret = parse_cose_key(&map, &hs->keyAgreement);
check_retr(ret);
parsed_count++;
break;
case EXT_HMAC_SECRET_SALT_ENC:
salt_len = 64;
ret = cbor_value_copy_byte_string(&map, hs->saltEnc, &salt_len, NULL);
check_ret(ret);
parsed_count++;
break;
case EXT_HMAC_SECRET_SALT_AUTH:
salt_len = 32;
ret = cbor_value_copy_byte_string(&map, hs->saltAuth, &salt_len, NULL);
check_ret(ret);
parsed_count++;
break;
}
if (parsed_count != 3)
{
return CTAP2_ERR_MISSING_PARAMETER;
}
ret = cbor_value_advance(&map);
check_ret(ret);
}
return 0;
}
uint8_t ctap_parse_extensions(CTAP_extensions * ext, CborValue * val)
{
CborValue map;
@ -600,14 +668,21 @@ uint8_t ctap_parse_extensions(CTAP_extensions * ext, CborValue * val)
ret = cbor_value_advance(&map);
check_ret(ret);
if (cbor_value_get_type(&map) == CborBooleanType)
{
if (strncmp(key, "hmac-secret",11) == 0)
{
if (cbor_value_get_type(&map) == CborBooleanType)
{
ret = cbor_value_get_boolean(&map, &b);
check_ret(ret);
ext->hmac_secret = b;
printf1(TAG_CTAP, "set hmac-secret to %d\r\n", b);
ext->hmac_secret_present = b;
printf1(TAG_CTAP, "set hmac_secret_present to %d\r\n", b);
}
else if (cbor_value_get_type(&map) == CborMapType)
{
ext->hmac_secret_present = 1;
ret = ctap_parse_hmac_secret(&ext->hmac_secret, &map);
check_retr(ret);
}
}
@ -1003,15 +1078,15 @@ uint8_t ctap_parse_get_assertion(CTAP_getAssertion * GA, uint8_t * request, int
return 0;
}
uint8_t parse_cose_key(CborValue * it, uint8_t * x, uint8_t * y, int * kty, int * crv)
uint8_t parse_cose_key(CborValue * it, COSE_key * cose)
{
CborValue map;
size_t map_length;
int ret,key;
unsigned int i;
int xkey = 0,ykey = 0;
*kty = 0;
*crv = 0;
cose->kty = 0;
cose->crv = 0;
CborType type = cbor_value_get_type(it);
@ -1049,7 +1124,7 @@ uint8_t parse_cose_key(CborValue * it, uint8_t * x, uint8_t * y, int * kty, int
printf1(TAG_PARSE,"COSE_KEY_LABEL_KTY\n");
if (cbor_value_get_type(&map) == CborIntegerType)
{
ret = cbor_value_get_int_checked(&map, kty);
ret = cbor_value_get_int_checked(&map, &cose->kty);
check_ret(ret);
}
else
@ -1064,7 +1139,7 @@ uint8_t parse_cose_key(CborValue * it, uint8_t * x, uint8_t * y, int * kty, int
printf1(TAG_PARSE,"COSE_KEY_LABEL_CRV\n");
if (cbor_value_get_type(&map) == CborIntegerType)
{
ret = cbor_value_get_int_checked(&map, crv);
ret = cbor_value_get_int_checked(&map, &cose->crv);
check_ret(ret);
}
else
@ -1074,14 +1149,14 @@ uint8_t parse_cose_key(CborValue * it, uint8_t * x, uint8_t * y, int * kty, int
break;
case COSE_KEY_LABEL_X:
printf1(TAG_PARSE,"COSE_KEY_LABEL_X\n");
ret = parse_fixed_byte_string(&map, x, 32);
ret = parse_fixed_byte_string(&map, cose->pubkey.x, 32);
check_retr(ret);
xkey = 1;
break;
case COSE_KEY_LABEL_Y:
printf1(TAG_PARSE,"COSE_KEY_LABEL_Y\n");
ret = parse_fixed_byte_string(&map, y, 32);
ret = parse_fixed_byte_string(&map, cose->pubkey.y, 32);
check_retr(ret);
ykey = 1;
@ -1093,7 +1168,7 @@ uint8_t parse_cose_key(CborValue * it, uint8_t * x, uint8_t * y, int * kty, int
ret = cbor_value_advance(&map);
check_ret(ret);
}
if (xkey == 0 || ykey == 0 || *kty == 0 || *crv == 0)
if (xkey == 0 || ykey == 0 || cose->kty == 0 || cose->crv == 0)
{
return CTAP2_ERR_MISSING_PARAMETER;
}
@ -1173,7 +1248,7 @@ uint8_t ctap_parse_client_pin(CTAP_clientPin * CP, uint8_t * request, int length
break;
case CP_keyAgreement:
printf1(TAG_CP,"CP_keyAgreement\n");
ret = parse_cose_key(&map, CP->keyAgreement.pubkey.x, CP->keyAgreement.pubkey.y, &CP->keyAgreement.kty, &CP->keyAgreement.crv);
ret = parse_cose_key(&map, &CP->keyAgreement);
check_retr(ret);
CP->keyAgreementPresent = 1;
break;

2
fido2/ctap_parse.h
View File

@ -30,7 +30,7 @@ uint8_t parse_rp(struct rpId * rp, CborValue * val);
uint8_t parse_options(CborValue * val, uint8_t * rk, uint8_t * uv, uint8_t * up);
uint8_t parse_allow_list(CTAP_getAssertion * GA, CborValue * it);
uint8_t parse_cose_key(CborValue * it, uint8_t * x, uint8_t * y, int * kty, int * crv);
uint8_t parse_cose_key(CborValue * it, COSE_key * cose);
uint8_t ctap_parse_make_credential(CTAP_makeCredential * MC, CborEncoder * encoder, uint8_t * request, int length);