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Avoid duplicated code of handling security environment

This commit is contained in:
Frank Morgner 2015-12-04 09:22:15 +01:00
parent ee65ab85ce
commit 36ceb890ab
1 changed files with 98 additions and 144 deletions
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206
src/libopensc/pkcs15-sec.c
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@ -49,7 +49,7 @@ static int select_key_file(struct sc_pkcs15_card *p15card,
/* TODO: Why file_app may be NULL -- at least 3F00 has to be present?
* Check validity of the following assumption. */
/* For pkcs15-emulated cards, the file_app may be NULL,
in that case we allways assume an absolute path */
* in that case we allways assume an absolute path */
if (!prkey->path.len && prkey->path.aid.len) {
/* Private key is a SDO allocated in application DF */
path = prkey->path;
@ -125,6 +125,72 @@ static int use_key(struct sc_pkcs15_card *p15card,
return r;
}
static int format_senv(struct sc_pkcs15_card *p15card,
const struct sc_pkcs15_object *obj,
sc_security_env_t *senv_out, sc_algorithm_info_t **alg_info_out)
{
sc_context_t *ctx = p15card->card->ctx;
const struct sc_pkcs15_prkey_info *prkey = (const struct sc_pkcs15_prkey_info *) obj->data;
memset(senv_out, 0, sizeof(*senv_out));
/* Card driver should have the access to supported algorithms from 'tokenInfo'. So that
* it can get value of card specific 'AlgorithmInfo::algRef'. */
memcpy(senv_out->supported_algos, &p15card->tokeninfo->supported_algos, sizeof(senv_out->supported_algos));
if ((obj->type & SC_PKCS15_TYPE_CLASS_MASK) != SC_PKCS15_TYPE_PRKEY)
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This is not a private key");
/* If the key is not native, we can't operate with it. */
if (!prkey->native)
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "This key is not native, cannot operate with it");
switch (obj->type) {
case SC_PKCS15_TYPE_PRKEY_RSA:
*alg_info_out = sc_card_find_rsa_alg(p15card->card, prkey->modulus_length);
if (*alg_info_out == NULL) {
sc_log(ctx, "Card does not support RSA with key length %d", prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv_out->algorithm = SC_ALGORITHM_RSA;
break;
case SC_PKCS15_TYPE_PRKEY_GOSTR3410:
*alg_info_out = sc_card_find_gostr3410_alg(p15card->card, prkey->modulus_length);
if (alg_info_out == NULL) {
sc_log(ctx, "Card does not support GOSTR3410 with key length %d", prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv_out->algorithm = SC_ALGORITHM_GOSTR3410;
break;
case SC_PKCS15_TYPE_PRKEY_EC:
*alg_info_out = sc_card_find_ec_alg(p15card->card, prkey->field_length, NULL);
if (*alg_info_out == NULL) {
sc_log(ctx, "Card does not support EC with field_size %d", prkey->field_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv_out->algorithm = SC_ALGORITHM_EC;
senv_out->flags |= SC_SEC_ENV_ALG_REF_PRESENT;
senv_out->algorithm_ref = prkey->field_length;
break;
/* add other crypto types here */
default:
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "Key type not supported");
}
senv_out->flags |= SC_SEC_ENV_ALG_PRESENT;
/* optional keyReference attribute (the default value is -1) */
if (prkey->key_reference >= 0) {
senv_out->key_ref_len = 1;
senv_out->key_ref[0] = prkey->key_reference & 0xFF;
senv_out->flags |= SC_SEC_ENV_KEY_REF_PRESENT;
}
return SC_SUCCESS;
}
int sc_pkcs15_decipher(struct sc_pkcs15_card *p15card,
const struct sc_pkcs15_object *obj,
unsigned long flags,
@ -139,55 +205,16 @@ int sc_pkcs15_decipher(struct sc_pkcs15_card *p15card,
LOG_FUNC_CALLED(ctx);
memset(&senv, 0, sizeof(senv));
/* Card driver should have the access to supported algorithms from 'tokenInfo'. So that
* it can get value of card specific 'AlgorithmInfo::algRef'. */
memcpy(&senv.supported_algos, &p15card->tokeninfo->supported_algos, sizeof(senv.supported_algos));
/* If the key is not native, we can't operate with it. */
if (!prkey->native)
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "This key is not native, cannot operate with it");
if (!(prkey->usage & (SC_PKCS15_PRKEY_USAGE_DECRYPT|SC_PKCS15_PRKEY_USAGE_UNWRAP)))
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This key cannot be used for decryption");
switch (obj->type) {
case SC_PKCS15_TYPE_PRKEY_RSA:
alg_info = sc_card_find_rsa_alg(p15card->card, prkey->modulus_length);
if (alg_info == NULL) {
sc_log(ctx, "Card does not support RSA with key length %d", prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv.algorithm = SC_ALGORITHM_RSA;
break;
case SC_PKCS15_TYPE_PRKEY_GOSTR3410:
alg_info = sc_card_find_gostr3410_alg(p15card->card, prkey->modulus_length);
if (alg_info == NULL) {
sc_log(ctx, "Card does not support GOSTR3410 with key length %d", prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv.algorithm = SC_ALGORITHM_GOSTR3410;
break;
default:
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED,"Key type not supported");
}
r = format_senv(p15card, obj, &senv, &alg_info);
LOG_TEST_RET(ctx, r, "Could not initialize security environment");
senv.operation = SC_SEC_OPERATION_DECIPHER;
r = sc_get_encoding_flags(ctx, flags, alg_info->flags, &pad_flags, &sec_flags);
LOG_TEST_RET(ctx, r, "cannot encode security operation flags");
senv.algorithm_flags = sec_flags;
senv.operation = SC_SEC_OPERATION_DECIPHER;
senv.flags = 0;
/* optional keyReference attribute (the default value is -1) */
if (prkey->key_reference >= 0) {
senv.key_ref_len = 1;
senv.key_ref[0] = prkey->key_reference & 0xFF;
senv.flags |= SC_SEC_ENV_KEY_REF_PRESENT;
}
senv.flags |= SC_SEC_ENV_ALG_PRESENT;
r = use_key(p15card, obj, &senv, sc_decipher, in, inlen, out,
outlen);
@ -224,54 +251,28 @@ int sc_pkcs15_derive(struct sc_pkcs15_card *p15card,
LOG_FUNC_CALLED(ctx);
memset(&senv, 0, sizeof(senv));
/* Card driver should have the access to supported algorithms from 'tokenInfo'. So that
* it can get value of card specific 'AlgorithmInfo::algRef'. */
memcpy(&senv.supported_algos, &p15card->tokeninfo->supported_algos, sizeof(senv.supported_algos));
/* If the key is not native, we can't operate with it. */
if (!prkey->native)
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "This key is not native, cannot operate with it");
if (!(prkey->usage & (SC_PKCS15_PRKEY_USAGE_DERIVE)))
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This key cannot be used for derivation");
switch (obj->type) {
case SC_PKCS15_TYPE_PRKEY_EC:
alg_info = sc_card_find_ec_alg(p15card->card, prkey->field_length, NULL);
if (alg_info == NULL) {
sc_log(ctx, "Card does not support EC with field_size %d", prkey->field_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
if (out == NULL || *poutlen < (prkey->field_length + 7) / 8) {
*poutlen = (prkey->field_length + 7) / 8;
r = 0; /* say no data to return */
goto out;
LOG_FUNC_RETURN(ctx, r);
}
senv.algorithm = SC_ALGORITHM_EC;
senv.flags |= SC_SEC_ENV_ALG_PRESENT;
senv.flags |= SC_SEC_ENV_ALG_REF_PRESENT;
senv.algorithm_ref = prkey->field_length;
break;
default:
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED,"Key type not supported");
}
r = format_senv(p15card, obj, &senv, &alg_info);
LOG_TEST_RET(ctx, r, "Could not initialize security environment");
senv.operation = SC_SEC_OPERATION_DERIVE;
r = sc_get_encoding_flags(ctx, flags, alg_info->flags, &pad_flags, &sec_flags);
LOG_TEST_RET(ctx, r, "cannot encode security operation flags");
senv.algorithm_flags = sec_flags;
senv.operation = SC_SEC_OPERATION_DERIVE;
/* optional keyReference attribute (the default value is -1) */
if (prkey->key_reference >= 0) {
senv.key_ref_len = 1;
senv.key_ref[0] = prkey->key_reference & 0xFF;
senv.flags |= SC_SEC_ENV_KEY_REF_PRESENT;
}
r = use_key(p15card, obj, &senv, sc_decipher, in, inlen, out,
*poutlen);
@ -287,7 +288,6 @@ int sc_pkcs15_derive(struct sc_pkcs15_card *p15card,
/* If card stores derived key on card, then no data is returned
* and the key must be used on the card. */
*poutlen = r;
out:
LOG_FUNC_RETURN(ctx, r);
}
@ -312,62 +312,25 @@ int sc_pkcs15_compute_signature(struct sc_pkcs15_card *p15card,
unsigned long pad_flags = 0, sec_flags = 0;
LOG_FUNC_CALLED(ctx);
sc_log(ctx, "security operation flags 0x%X", flags);
memset(&senv, 0, sizeof(senv));
/* Card driver should have the access to supported algorithms from 'tokenInfo'. So that
* it can get value of card specific 'AlgorithmInfo::algRef'. */
memcpy(&senv.supported_algos, &p15card->tokeninfo->supported_algos, sizeof(senv.supported_algos));
if ((obj->type & SC_PKCS15_TYPE_CLASS_MASK) != SC_PKCS15_TYPE_PRKEY)
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This is not a private key");
/* If the key is not native, we can't operate with it. */
if (!prkey->native)
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "This key is not native, cannot operate with it");
if (!(prkey->usage & (SC_PKCS15_PRKEY_USAGE_SIGN|SC_PKCS15_PRKEY_USAGE_SIGNRECOVER|
SC_PKCS15_PRKEY_USAGE_NONREPUDIATION)))
LOG_TEST_RET(ctx, SC_ERROR_NOT_ALLOWED, "This key cannot be used for signing");
r = format_senv(p15card, obj, &senv, &alg_info);
LOG_TEST_RET(ctx, r, "Could not initialize security environment");
senv.operation = SC_SEC_OPERATION_SIGN;
switch (obj->type) {
case SC_PKCS15_TYPE_PRKEY_RSA:
modlen = prkey->modulus_length / 8;
alg_info = sc_card_find_rsa_alg(p15card->card, prkey->modulus_length);
if (alg_info == NULL) {
sc_log(ctx, "Card does not support RSA with key length %d", prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv.flags |= SC_SEC_ENV_ALG_PRESENT;
senv.algorithm = SC_ALGORITHM_RSA;
break;
case SC_PKCS15_TYPE_PRKEY_GOSTR3410:
modlen = (prkey->modulus_length + 7) / 8 * 2;
alg_info = sc_card_find_gostr3410_alg(p15card->card, prkey->modulus_length);
if (alg_info == NULL) {
sc_log(ctx, "Card does not support GOSTR3410 with key length %d", prkey->modulus_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv.flags |= SC_SEC_ENV_ALG_PRESENT;
senv.algorithm = SC_ALGORITHM_GOSTR3410;
break;
case SC_PKCS15_TYPE_PRKEY_EC:
modlen = ((prkey->field_length +7) / 8) * 2; /* 2*nLen */
alg_info = sc_card_find_ec_alg(p15card->card, prkey->field_length, NULL);
if (alg_info == NULL) {
sc_log(ctx, "Card does not support EC with field_size %d", prkey->field_length);
LOG_FUNC_RETURN(ctx, SC_ERROR_NOT_SUPPORTED);
}
senv.algorithm = SC_ALGORITHM_EC;
senv.flags |= SC_SEC_ENV_ALG_PRESENT;
senv.flags |= SC_SEC_ENV_ALG_REF_PRESENT;
senv.algorithm_ref = prkey->field_length;
break;
/* add other crypto types here */
default:
LOG_TEST_RET(ctx, SC_ERROR_NOT_SUPPORTED, "Key type not supported");
}
@ -391,7 +354,7 @@ int sc_pkcs15_compute_signature(struct sc_pkcs15_card *p15card,
* senv.algorithm_flags: what the card will have to do */
/* if the card has SC_ALGORITHM_NEED_USAGE set, and the
key is for signing and decryption, we need to emulate signing */
* key is for signing and decryption, we need to emulate signing */
/* TODO: -DEE assume only RSA keys will ever use _NEED_USAGE */
sc_log(ctx, "supported algorithm flags 0x%X, private key usage 0x%X", alg_info->flags, prkey->usage);
@ -468,15 +431,6 @@ int sc_pkcs15_compute_signature(struct sc_pkcs15_card *p15card,
inlen = modlen;
}
senv.operation = SC_SEC_OPERATION_SIGN;
/* optional keyReference attribute (the default value is -1) */
if (prkey->key_reference >= 0) {
senv.key_ref_len = 1;
senv.key_ref[0] = prkey->key_reference & 0xFF;
senv.flags |= SC_SEC_ENV_KEY_REF_PRESENT;
}
r = use_key(p15card, obj, &senv, sc_compute_signature, tmp, inlen,
out, outlen);
LOG_TEST_RET(ctx, r, "use_key() failed");