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Fri, 19 Aug 2022 22:31:43 +0000 (GMT) Received: from rhel-laptop.ibm.com.com (unknown [9.65.239.18]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 19 Aug 2022 22:31:43 +0000 (GMT) From: gjoyce@linux.vnet.ibm.com To: linux-block@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org, jonathan.derrick@linux.dev, brking@linux.vnet.ibm.com, msuchanek@suse.de, mpe@ellerman.id.au, nayna@linux.ibm.com, axboe@kernel.dk, akpm@linux-foundation.org, gjoyce@linux.vnet.ibm.com, linux-efi@vger.kernel.org, keyrings@vger.kernel.org, dhowells@redhat.com, jarkko@kernel.org Subject: [PATCH v4 2/3] powerpc/pseries: PLPKS SED Opal keystore support Date: Fri, 19 Aug 2022 17:31:37 -0500 Message-Id: <20220819223138.1457091-3-gjoyce@linux.vnet.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220819223138.1457091-1-gjoyce@linux.vnet.ibm.com> References: <20220819223138.1457091-1-gjoyce@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: sslPlRYGF1XJ2crWZVWc7McGjzt2fUkW X-Proofpoint-GUID: R84sbELsnrJkWagdXOjptO0zoB6Yh9tx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-19_12,2022-08-18_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 impostorscore=0 adultscore=0 mlxlogscore=999 priorityscore=1501 suspectscore=0 clxscore=1015 spamscore=0 lowpriorityscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208190082 Precedence: bulk List-ID: X-Mailing-List: keyrings@vger.kernel.org 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 | 124 ++++++++++++++++++ 2 files changed, 125 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 14e143b946a3..b7fea9e48a58 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -29,6 +29,7 @@ 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..833226738448 --- /dev/null +++ b/arch/powerpc/platforms/pseries/plpks_sed_ops.c @@ -0,0 +1,124 @@ +// 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 = 0; + int ret; + + plpks_init_var(&var, keyname); + + offset = offsetof(struct plpks_sed_object_data, key); + + ret = plpks_read_os_var(&var); + if (ret != 0) + return ret; + + if (offset > var.datalen) + offset = 0; + + data = (struct plpks_sed_object_data *)var.data; + *keylen = be32_to_cpu(data->key_len); + + if (var.data) { + memcpy(key, var.data + offset, var.datalen - offset); + key[*keylen] = '\0'; + kfree(var.data); + } + + 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); +}