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net: lib: tls_credentials: return size required

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If either no buffer is provided or the size of it
is too small, return the required length.

Signed-off-by: Pete Skeggs <peter.skeggs@nordicsemi.no>
This commit is contained in:
Pete Skeggs 2024-10-04 15:35:36 -07:00 committed by Benjamin Cabé
parent b33b3b17f7
commit 6ec5729a3d
2 changed files with 13 additions and 0 deletions
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1
include/zephyr/net/tls_credentials.h
View file

@ -107,6 +107,7 @@ int tls_credential_add(sec_tag_t tag, enum tls_credential_type type,
* @retval -EACCES Access to the TLS credential subsystem was denied.
* @retval -ENOENT Requested TLS credential was not found.
* @retval -EFBIG Requested TLS credential does not fit in the buffer provided.
* Check *credlen for size required.
*/
int tls_credential_get(sec_tag_t tag, enum tls_credential_type type,
void *cred, size_t *credlen);

12
subsys/net/lib/tls_credentials/tls_credentials.c
View file

@ -11,6 +11,11 @@
#include "tls_internal.h"
#include "tls_credentials_digest_raw.h"
#include <zephyr/logging/log.h>
LOG_MODULE_DECLARE(tls_credentials,
CONFIG_TLS_CREDENTIALS_LOG_LEVEL);
/* Global pool of credentials shared among TLS contexts. */
static struct tls_credential credentials[CONFIG_TLS_MAX_CREDENTIALS_NUMBER];
@ -158,11 +163,18 @@ int tls_credential_get(sec_tag_t tag, enum tls_credential_type type,
credential = credential_get(tag, type);
if (credential == NULL) {
ret = -ENOENT;
*credlen = 0;
goto exit;
}
if (credential->len > *credlen) {
ret = -EFBIG;
LOG_DBG("Not enough room in the credential buffer to "
"retrieve credential with sectag %d and type %d. "
"Increase TLS_CREDENTIALS_SHELL_MAX_CRED_LEN "
">= %d.\n",
tag, (int)type, (int)credential->len);
*credlen = credential->len;
goto exit;
}