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Refactor E1 Security Information decoding function

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* adopt changes from 182b05bd
* add checks on optional IEs
* add checks on encoded buffer sizes
This commit is contained in:
Guido Casati
2025-04-07 12:29:23 +02:00
parent 673770d346
commit 248380b6a4
1 changed files with 16 additions and 6 deletions
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openair2/E1AP/lib/e1ap_bearer_context_management.c
+16 -6
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@@ -84,19 +84,29 @@ static E1AP_SecurityInformation_t e1_encode_security_info(const security_informa
return ie;
}
/**
* @brief Decode E1AP_SecurityInformation_t
*/
/** @brief Decode Security Information IE (3GPP TS 38.463, 9.3.1.10) */
static bool e1_decode_security_info(security_information_t *out, const E1AP_SecurityInformation_t *in)
{
// Security Algorithm (M) (9.3.1.31)
// Ciphering Algorithm (M)
out->cipheringAlgorithm = in->securityAlgorithm.cipheringAlgorithm;
// Integrity Protection Algorithm (O)
out->integrityProtectionAlgorithm =
in->securityAlgorithm.integrityProtectionAlgorithm == NULL ? 0 : *in->securityAlgorithm.integrityProtectionAlgorithm;
// User Plane Security Keys (M) (9.3.1.32)
// Encryption Key (M)
_E1_EQ_CHECK_INT((int)in->uPSecuritykey.encryptionKey.size, E1AP_SECURITY_KEY_SIZE);
memcpy(out->encryptionKey, in->uPSecuritykey.encryptionKey.buf, in->uPSecuritykey.encryptionKey.size);
if (in->securityAlgorithm.integrityProtectionAlgorithm)
out->integrityProtectionAlgorithm = *in->securityAlgorithm.integrityProtectionAlgorithm;
// Integrity Protection Key (O)
if (in->uPSecuritykey.integrityProtectionKey) {
E1AP_IntegrityProtectionKey_t *ipKey = in->uPSecuritykey.integrityProtectionKey;
memcpy(out->integrityProtectionKey, ipKey->buf, ipKey->size);
_E1_EQ_CHECK_INT((int)ipKey->size, E1AP_SECURITY_KEY_SIZE);
memcpy(out->integrityProtectionKey, ipKey->buf, E1AP_SECURITY_KEY_SIZE);
} else {
memset(out->integrityProtectionKey, 0, E1AP_SECURITY_KEY_SIZE);
}
return true;
}