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Wed, 30 Nov 2022 20:24:02 +0000 (GMT) From: gjoyce@linux.vnet.ibm.com To: linux-block@vger.kernel.org Subject: [PATCH v5 2/3] powerpc/pseries: PLPKS SED Opal keystore support Date: Wed, 30 Nov 2022 14:23:57 -0600 Message-Id: <20221130202358.18034-3-gjoyce@linux.vnet.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221130202358.18034-1-gjoyce@linux.vnet.ibm.com> References: <20221130202358.18034-1-gjoyce@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: WQVGc5sBIZT3cez3D_f-UwHPMq8aeway X-Proofpoint-GUID: WQVGc5sBIZT3cez3D_f-UwHPMq8aeway X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-30_04,2022-11-30_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1015 mlxlogscore=999 mlxscore=0 lowpriorityscore=0 bulkscore=0 spamscore=0 impostorscore=0 malwarescore=0 adultscore=0 suspectscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211300141 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: axboe@kernel.dk, gjoyce@linux.vnet.ibm.com, nayna@linux.ibm.com, keyrings@vger.kernel.org, jonathan.derrick@linux.dev, brking@linux.vnet.ibm.com, akpm@linux-foundation.org, msuchanek@suse.de, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Greg Joyce Define operations for SED Opal to read/write keys from POWER LPAR Platform KeyStore(PLPKS). This allows for non-volatile storage of SED Opal keys. Signed-off-by: Greg Joyce Reviewed-by: Jonathan Derrick --- arch/powerpc/platforms/pseries/Makefile | 1 + .../powerpc/platforms/pseries/plpks_sed_ops.c | 129 ++++++++++++++++++ 2 files changed, 130 insertions(+) create mode 100644 arch/powerpc/platforms/pseries/plpks_sed_ops.c diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile index 92310202bdd7..5bedc06ee2cc 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_PPC_SPLPAR) += vphn.o obj-$(CONFIG_PPC_SVM) += svm.o obj-$(CONFIG_FA_DUMP) += rtas-fadump.o obj-$(CONFIG_PSERIES_PLPKS) += plpks.o +obj-$(CONFIG_PSERIES_PLPKS) += plpks_sed_ops.o obj-$(CONFIG_SUSPEND) += suspend.o obj-$(CONFIG_PPC_VAS) += vas.o vas-sysfs.o diff --git a/arch/powerpc/platforms/pseries/plpks_sed_ops.c b/arch/powerpc/platforms/pseries/plpks_sed_ops.c new file mode 100644 index 000000000000..cd1084d07716 --- /dev/null +++ b/arch/powerpc/platforms/pseries/plpks_sed_ops.c @@ -0,0 +1,129 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * POWER Platform specific code for non-volatile SED key access + * Copyright (C) 2022 IBM Corporation + * + * Define operations for SED Opal to read/write keys + * from POWER LPAR Platform KeyStore(PLPKS). + * + * Self Encrypting Drives(SED) key storage using PLPKS + */ + +#include +#include +#include +#include +#include +#include "plpks.h" + +/* + * structure that contains all SED data + */ +struct plpks_sed_object_data { + u_char version; + u_char pad1[7]; + u_long authority; + u_long range; + u_int key_len; + u_char key[32]; +}; + +#define PLPKS_PLATVAR_POLICY WORLDREADABLE +#define PLPKS_PLATVAR_OS_COMMON 4 + +#define PLPKS_SED_OBJECT_DATA_V0 0 +#define PLPKS_SED_MANGLED_LABEL "/default/pri" +#define PLPKS_SED_COMPONENT "sed-opal" +#define PLPKS_SED_KEY "opal-boot-pin" + +/* + * authority is admin1 and range is global + */ +#define PLPKS_SED_AUTHORITY 0x0000000900010001 +#define PLPKS_SED_RANGE 0x0000080200000001 + +void plpks_init_var(struct plpks_var *var, char *keyname) +{ + var->name = keyname; + var->namelen = strlen(keyname); + if (strcmp(PLPKS_SED_KEY, keyname) == 0) { + var->name = PLPKS_SED_MANGLED_LABEL; + var->namelen = strlen(keyname); + } + var->policy = PLPKS_PLATVAR_POLICY; + var->os = PLPKS_PLATVAR_OS_COMMON; + var->data = NULL; + var->datalen = 0; + var->component = PLPKS_SED_COMPONENT; +} + +/* + * Read the SED Opal key from PLPKS given the label + */ +int sed_read_key(char *keyname, char *key, u_int *keylen) +{ + struct plpks_var var; + struct plpks_sed_object_data *data; + u_int offset; + int ret; + u_int len; + + plpks_init_var(&var, keyname); + + ret = plpks_read_os_var(&var); + if (ret != 0) + return ret; + + offset = offsetof(struct plpks_sed_object_data, key); + if (offset > var.datalen) { + kfree(var.data); + return -EINVAL; + } + + data = (struct plpks_sed_object_data *)var.data; + len = min(be32_to_cpu(data->key_len), *keylen); + + if (var.data) { + memcpy(key, data->key, len); + kfree(var.data); + } else + len = 0; + + key[len] = '\0'; + *keylen = len; + + return 0; +} + +/* + * Write the SED Opal key to PLPKS given the label + */ +int sed_write_key(char *keyname, char *key, u_int keylen) +{ + struct plpks_var var; + struct plpks_sed_object_data data; + struct plpks_var_name vname; + + plpks_init_var(&var, keyname); + + var.datalen = sizeof(struct plpks_sed_object_data); + var.data = (u8 *)&data; + + /* initialize SED object */ + data.version = PLPKS_SED_OBJECT_DATA_V0; + data.authority = cpu_to_be64(PLPKS_SED_AUTHORITY); + data.range = cpu_to_be64(PLPKS_SED_RANGE); + memset(&data.pad1, '\0', sizeof(data.pad1)); + data.key_len = cpu_to_be32(keylen); + memcpy(data.key, (char *)key, keylen); + + /* + * Key update requires remove first. The return value + * is ignored since it's okay if the key doesn't exist. + */ + vname.namelen = var.namelen; + vname.name = var.name; + plpks_remove_var(var.component, var.os, vname); + + return plpks_write_var(var); +}