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/** @file
Implementation of getting bootstrap credential via IPMI.
Copyright (c) 2022-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Specification Reference:
- Redfish Host Interface Specification
(https://www.dmtf.org/sites/default/files/standards/documents/DSP0270_1.3.0.pdf)
**/
#include "RedfishPlatformCredentialIpmiLib.h"
//
// Global flag of controlling credential service
//
BOOLEAN mRedfishServiceStopped = FALSE;
/**
Notify the Redfish service provide to stop provide configuration service to this platform.
This function should be called when the platform is about to leave the safe environment.
It will notify the Redfish service provider to abort all login session, and prohibit
further login with original auth info. GetAuthInfo() will return EFI_UNSUPPORTED once this
function is returned.
@param[in] This Pointer to EDKII_REDFISH_CREDENTIAL_PROTOCOL instance.
@param[in] ServiceStopType Reason of stopping Redfish service.
@retval EFI_SUCCESS Service has been stoped successfully.
@retval EFI_INVALID_PARAMETER This is NULL.
@retval Others Some error happened.
**/
EFI_STATUS
EFIAPI
LibStopRedfishService (
IN EDKII_REDFISH_CREDENTIAL_PROTOCOL *This,
IN EDKII_REDFISH_CREDENTIAL_STOP_SERVICE_TYPE ServiceStopType
)
{
EFI_STATUS Status;
if ((ServiceStopType <= ServiceStopTypeNone) || (ServiceStopType >= ServiceStopTypeMax)) {
return EFI_INVALID_PARAMETER;
}
//
// Only stop credential service after leaving BIOS
//
if (ServiceStopType != ServiceStopTypeExitBootService) {
return EFI_UNSUPPORTED;
}
//
// Raise flag first
//
mRedfishServiceStopped = TRUE;
//
// Delete cached variable
//
Status = SetBootstrapAccountCredentialsToVariable (NULL, NULL, TRUE);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: fail to remove bootstrap credential: %r\n", __FUNCTION__, Status));
}
DEBUG ((DEBUG_INFO, "%a: bootstrap credential service stopped\n", __FUNCTION__));
return EFI_SUCCESS;
}
/**
Notification of Exit Boot Service.
@param[in] This Pointer to EDKII_REDFISH_CREDENTIAL_PROTOCOL.
**/
VOID
EFIAPI
LibCredentialExitBootServicesNotify (
IN EDKII_REDFISH_CREDENTIAL_PROTOCOL *This
)
{
//
// Stop the credential support when system is about to enter OS.
//
LibStopRedfishService (This, ServiceStopTypeExitBootService);
}
/**
Notification of End of DXe.
@param[in] This Pointer to EDKII_REDFISH_CREDENTIAL_PROTOCOL.
**/
VOID
EFIAPI
LibCredentialEndOfDxeNotify (
IN EDKII_REDFISH_CREDENTIAL_PROTOCOL *This
)
{
//
// Do nothing now.
// We can stop credential support when system reach end-of-dxe for security reason.
//
}
/**
Function to retrieve temporary user credentials for the UEFI redfish client. This function can
also disable bootstrap credential service in BMC.
@param[in] DisableBootstrapControl TRUE - Tell the BMC to disable the bootstrap credential
service to ensure no one else gains credentials
FALSE Allow the bootstrap credential service to continue
@param[in,out] BootstrapUsername A pointer to a Ascii encoded string for the credential username
When DisableBootstrapControl is TRUE, this pointer can be NULL
@param[in] BootstrapUsernameSize The size of BootstrapUsername including NULL terminator in bytes.
Per specification, the size is USERNAME_MAX_SIZE.
@param[in,out] BootstrapPassword A pointer to a Ascii encoded string for the credential password
When DisableBootstrapControl is TRUE, this pointer can be NULL
@param[in] BootstrapPasswordSize The size of BootstrapPassword including NULL terminator in bytes.
Per specification, the size is PASSWORD_MAX_SIZE.
@retval EFI_SUCCESS Credentials were successfully fetched and returned. When DisableBootstrapControl
is set to TRUE, the bootstrap credential service is disabled successfully.
@retval EFI_INVALID_PARAMETER BootstrapUsername or BootstrapPassword is NULL when DisableBootstrapControl
is set to FALSE. BootstrapUsernameSize or BootstrapPasswordSize is incorrect when
DisableBootstrapControl is set to FALSE.
@retval EFI_DEVICE_ERROR An IPMI failure occurred
**/
EFI_STATUS
GetBootstrapAccountCredentials (
IN BOOLEAN DisableBootstrapControl,
IN OUT CHAR8 *BootstrapUsername, OPTIONAL
IN UINTN BootstrapUsernameSize,
IN OUT CHAR8 *BootstrapPassword, OPTIONAL
IN UINTN BootstrapPasswordSize
)
{
EFI_STATUS Status;
IPMI_BOOTSTRAP_CREDENTIALS_COMMAND_DATA CommandData;
IPMI_BOOTSTRAP_CREDENTIALS_RESULT_RESPONSE ResponseData;
UINT32 ResponseSize;
//
// NULL buffer check
//
if (!DisableBootstrapControl && ((BootstrapUsername == NULL) || (BootstrapPassword == NULL))) {
return EFI_INVALID_PARAMETER;
}
if ((BootstrapUsernameSize != USERNAME_MAX_SIZE) || (BootstrapPasswordSize != PASSWORD_MAX_SIZE)) {
return EFI_INVALID_PARAMETER;
}
DEBUG ((DEBUG_VERBOSE, "%a: Disable bootstrap control: 0x%x\n", __FUNCTION__, DisableBootstrapControl));
//
// IPMI callout to NetFn 2C, command 02
// Request data:
// Byte 1: REDFISH_IPMI_GROUP_EXTENSION
// Byte 2: DisableBootstrapControl
//
CommandData.GroupExtensionId = REDFISH_IPMI_GROUP_EXTENSION;
CommandData.DisableBootstrapControl = (DisableBootstrapControl ? REDFISH_IPMI_BOOTSTRAP_CREDENTIAL_DISABLE : REDFISH_IPMI_BOOTSTRAP_CREDENTIAL_ENABLE);
ResponseSize = sizeof (ResponseData);
//
// Response data:
// Byte 1 : Completion code
// Byte 2 : REDFISH_IPMI_GROUP_EXTENSION
// Byte 3-18 : Username
// Byte 19-34: Password
//
Status = IpmiSubmitCommand (
IPMI_NETFN_GROUP_EXT,
REDFISH_IPMI_GET_BOOTSTRAP_CREDENTIALS_CMD,
(UINT8 *)&CommandData,
sizeof (CommandData),
(UINT8 *)&ResponseData,
&ResponseSize
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: IPMI transaction failure. Returning\n", __FUNCTION__));
return Status;
} else {
if (ResponseData.CompletionCode != IPMI_COMP_CODE_NORMAL) {
if (ResponseData.CompletionCode == REDFISH_IPMI_COMP_CODE_BOOTSTRAP_CREDENTIAL_DISABLED) {
DEBUG ((DEBUG_ERROR, "%a: bootstrap credential support was disabled\n", __FUNCTION__));
return EFI_ACCESS_DENIED;
}
DEBUG ((DEBUG_ERROR, "%a: Completion code = 0x%x. Returning\n", __FUNCTION__, ResponseData.CompletionCode));
return EFI_PROTOCOL_ERROR;
} else if (ResponseData.GroupExtensionId != REDFISH_IPMI_GROUP_EXTENSION) {
DEBUG ((DEBUG_ERROR, "%a: Group Extension Response = 0x%x. Returning\n", __FUNCTION__, ResponseData.GroupExtensionId));
return EFI_DEVICE_ERROR;
} else {
if (BootstrapUsername != NULL) {
CopyMem (BootstrapUsername, ResponseData.Username, USERNAME_MAX_LENGTH);
//
// Manually append null-terminator in case 16 characters username returned.
//
BootstrapUsername[USERNAME_MAX_LENGTH] = '\0';
}
if (BootstrapPassword != NULL) {
CopyMem (BootstrapPassword, ResponseData.Password, PASSWORD_MAX_LENGTH);
//
// Manually append null-terminator in case 16 characters password returned.
//
BootstrapPassword[PASSWORD_MAX_LENGTH] = '\0';
}
}
}
DEBUG ((DEBUG_INFO, "%a: get bootstrap credential via IPMI: %r\n", __FUNCTION__, Status));
return Status;
}
/**
Function to retrieve temporary user credentials from cached boot time variable.
@param[in,out] BootstrapUsername A pointer to a Ascii encoded string for the credential username.
@param[in] BootstrapUsernameSize The size of BootstrapUsername including NULL terminator in bytes.
Per specification, the size is USERNAME_MAX_SIZE.
@param[in,out] BootstrapPassword A pointer to a Ascii encoded string for the credential password.
@param[in] BootstrapPasswordSize The size of BootstrapPassword including NULL terminator in bytes.
Per specification, the size is PASSWORD_MAX_SIZE.
@retval EFI_SUCCESS Credentials were successfully fetched and returned.
@retval EFI_INVALID_PARAMETER BootstrapUsername or BootstrapPassword is NULL.
BootstrapUsernameSize or BootstrapPasswordSize is incorrect.
@retval EFI_NOT_FOUND No variable found for account and credentials.
**/
EFI_STATUS
GetBootstrapAccountCredentialsFromVariable (
IN OUT CHAR8 *BootstrapUsername,
IN UINTN BootstrapUsernameSize,
IN OUT CHAR8 *BootstrapPassword,
IN UINTN BootstrapPasswordSize
)
{
EFI_STATUS Status;
BOOTSTRAP_CREDENTIALS_VARIABLE *CredentialVariable;
VOID *Data;
UINTN DataSize;
if ((BootstrapUsername == NULL) || (BootstrapPassword == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((BootstrapUsernameSize != USERNAME_MAX_SIZE) || (BootstrapPasswordSize != PASSWORD_MAX_SIZE)) {
return EFI_INVALID_PARAMETER;
}
DataSize = 0;
Status = GetVariable2 (
CREDENTIAL_VARIABLE_NAME,
&gEfiRedfishVariableGuid,
(VOID *)&Data,
&DataSize
);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
if (DataSize != sizeof (BOOTSTRAP_CREDENTIALS_VARIABLE)) {
DEBUG ((DEBUG_ERROR, "%a: data corruption. returned size: %d != structure size: %d\n", __FUNCTION__, DataSize, sizeof (BOOTSTRAP_CREDENTIALS_VARIABLE)));
FreePool (Data);
return EFI_NOT_FOUND;
}
CredentialVariable = (BOOTSTRAP_CREDENTIALS_VARIABLE *)Data;
AsciiStrCpyS (BootstrapUsername, USERNAME_MAX_SIZE, CredentialVariable->Username);
AsciiStrCpyS (BootstrapPassword, PASSWORD_MAX_SIZE, CredentialVariable->Password);
ZeroMem (CredentialVariable->Username, USERNAME_MAX_SIZE);
ZeroMem (CredentialVariable->Password, PASSWORD_MAX_SIZE);
FreePool (Data);
DEBUG ((DEBUG_INFO, "%a: get bootstrap credential from variable\n", __FUNCTION__));
return EFI_SUCCESS;
}
/**
Function to save temporary user credentials into boot time variable. When DeleteVariable is True,
this function delete boot time variable.
@param[in] BootstrapUsername A pointer to a Ascii encoded string for the credential username.
@param[in] BootstrapPassword A pointer to a Ascii encoded string for the credential password.
@param[in] DeleteVariable True to remove boot time variable. False otherwise.
@retval EFI_SUCCESS Credentials were successfully saved.
@retval EFI_INVALID_PARAMETER BootstrapUsername or BootstrapPassword is NULL
@retval Others Error occurs
**/
EFI_STATUS
SetBootstrapAccountCredentialsToVariable (
IN CHAR8 *BootstrapUsername, OPTIONAL
IN CHAR8 *BootstrapPassword, OPTIONAL
IN BOOLEAN DeleteVariable
)
{
EFI_STATUS Status;
BOOTSTRAP_CREDENTIALS_VARIABLE CredentialVariable;
VOID *Data;
if (!DeleteVariable && ((BootstrapUsername == NULL) || (BootstrapUsername[0] == '\0'))) {
return EFI_INVALID_PARAMETER;
}
if (!DeleteVariable && ((BootstrapPassword == NULL) || (BootstrapPassword[0] == '\0'))) {
return EFI_INVALID_PARAMETER;
}
//
// Delete variable
//
Status = GetVariable2 (
CREDENTIAL_VARIABLE_NAME,
&gEfiRedfishVariableGuid,
(VOID *)&Data,
NULL
);
if (!EFI_ERROR (Status)) {
FreePool (Data);
gRT->SetVariable (
CREDENTIAL_VARIABLE_NAME,
&gEfiRedfishVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS,
0,
NULL
);
}
//
// This is request to delete credentials. We are done.
//
if (DeleteVariable) {
return EFI_SUCCESS;
}
ZeroMem (CredentialVariable.Username, USERNAME_MAX_SIZE);
ZeroMem (CredentialVariable.Password, PASSWORD_MAX_SIZE);
AsciiStrCpyS (CredentialVariable.Username, USERNAME_MAX_SIZE, BootstrapUsername);
AsciiStrCpyS (CredentialVariable.Password, PASSWORD_MAX_SIZE, BootstrapPassword);
Status = gRT->SetVariable (
CREDENTIAL_VARIABLE_NAME,
&gEfiRedfishVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS,
sizeof (BOOTSTRAP_CREDENTIALS_VARIABLE),
(VOID *)&CredentialVariable
);
ZeroMem (CredentialVariable.Username, USERNAME_MAX_SIZE);
ZeroMem (CredentialVariable.Password, PASSWORD_MAX_SIZE);
return Status;
}
/**
Retrieve platform's Redfish authentication information.
This functions returns the Redfish authentication method together with the user Id and
password.
- For AuthMethodNone, the UserId and Password could be used for HTTP header authentication
as defined by RFC7235.
- For AuthMethodRedfishSession, the UserId and Password could be used for Redfish
session login as defined by Redfish API specification (DSP0266).
Callers are responsible for and freeing the returned string storage.
@param[in] This Pointer to EDKII_REDFISH_CREDENTIAL_PROTOCOL instance.
@param[out] AuthMethod Type of Redfish authentication method.
@param[out] UserId The pointer to store the returned UserId string.
@param[out] Password The pointer to store the returned Password string.
@retval EFI_SUCCESS Get the authentication information successfully.
@retval EFI_ACCESS_DENIED SecureBoot is disabled after EndOfDxe.
@retval EFI_INVALID_PARAMETER This or AuthMethod or UserId or Password is NULL.
@retval EFI_OUT_OF_RESOURCES There are not enough memory resources.
@retval EFI_UNSUPPORTED Unsupported authentication method is found.
**/
EFI_STATUS
EFIAPI
LibCredentialGetAuthInfo (
IN EDKII_REDFISH_CREDENTIAL_PROTOCOL *This,
OUT EDKII_REDFISH_AUTH_METHOD *AuthMethod,
OUT CHAR8 **UserId,
OUT CHAR8 **Password
)
{
EFI_STATUS Status;
BOOLEAN DisableCredentialService;
if ((AuthMethod == NULL) || (UserId == NULL) || (Password == NULL)) {
return EFI_INVALID_PARAMETER;
}
*UserId = NULL;
*Password = NULL;
DisableCredentialService = PcdGetBool (PcdRedfishDisableBootstrapCredentialService);
if (mRedfishServiceStopped) {
DEBUG ((DEBUG_ERROR, "%a: credential service is stopped due to security reason\n", __FUNCTION__));
return EFI_ACCESS_DENIED;
}
*AuthMethod = AuthMethodHttpBasic;
*UserId = AllocateZeroPool (sizeof (CHAR8) * USERNAME_MAX_SIZE);
if (*UserId == NULL) {
return EFI_OUT_OF_RESOURCES;
}
*Password = AllocateZeroPool (sizeof (CHAR8) * PASSWORD_MAX_SIZE);
if (*Password == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Get bootstrap credential from variable first
//
Status = GetBootstrapAccountCredentialsFromVariable (*UserId, USERNAME_MAX_SIZE, *Password, PASSWORD_MAX_SIZE);
if (!EFI_ERROR (Status)) {
return EFI_SUCCESS;
}
//
// Make a IPMI query
//
Status = GetBootstrapAccountCredentials (DisableCredentialService, *UserId, USERNAME_MAX_SIZE, *Password, PASSWORD_MAX_SIZE);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: fail to get bootstrap credential: %r\n", __FUNCTION__, Status));
return Status;
}
if (DisableCredentialService) {
DEBUG ((DEBUG_INFO, "%a: credential bootstrapping control disabled\n", __FUNCTION__));
}
Status = SetBootstrapAccountCredentialsToVariable (*UserId, *Password, FALSE);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: fail to cache bootstrap credential: %r\n", __FUNCTION__, Status));
}
return EFI_SUCCESS;
}
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