1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (c) 2018 Bootlin 4 * Author: Miquel Raynal <miquel.raynal@bootlin.com> 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <log.h> 10 #include <mapmem.h> 11 #include <tpm-common.h> 12 #include <tpm-v2.h> 13 #include "tpm-user-utils.h" 14 15 static int do_tpm2_startup(cmd_tbl_t *cmdtp, int flag, int argc, 16 char * const argv[]) 17 { 18 enum tpm2_startup_types mode; 19 20 if (argc != 2) 21 return CMD_RET_USAGE; 22 23 if (!strcasecmp("TPM2_SU_CLEAR", argv[1])) { 24 mode = TPM2_SU_CLEAR; 25 } else if (!strcasecmp("TPM2_SU_STATE", argv[1])) { 26 mode = TPM2_SU_STATE; 27 } else { 28 printf("Couldn't recognize mode string: %s\n", argv[1]); 29 return CMD_RET_FAILURE; 30 } 31 32 return report_return_code(tpm2_startup(mode)); 33 } 34 35 static int do_tpm2_self_test(cmd_tbl_t *cmdtp, int flag, int argc, 36 char * const argv[]) 37 { 38 enum tpm2_yes_no full_test; 39 40 if (argc != 2) 41 return CMD_RET_USAGE; 42 43 if (!strcasecmp("full", argv[1])) { 44 full_test = TPMI_YES; 45 } else if (!strcasecmp("continue", argv[1])) { 46 full_test = TPMI_NO; 47 } else { 48 printf("Couldn't recognize test mode: %s\n", argv[1]); 49 return CMD_RET_FAILURE; 50 } 51 52 return report_return_code(tpm2_self_test(full_test)); 53 } 54 55 static int do_tpm2_clear(cmd_tbl_t *cmdtp, int flag, int argc, 56 char * const argv[]) 57 { 58 u32 handle = 0; 59 const char *pw = (argc < 3) ? NULL : argv[2]; 60 const ssize_t pw_sz = pw ? strlen(pw) : 0; 61 62 if (argc < 2 || argc > 3) 63 return CMD_RET_USAGE; 64 65 if (pw_sz > TPM2_DIGEST_LEN) 66 return -EINVAL; 67 68 if (!strcasecmp("TPM2_RH_LOCKOUT", argv[1])) 69 handle = TPM2_RH_LOCKOUT; 70 else if (!strcasecmp("TPM2_RH_PLATFORM", argv[1])) 71 handle = TPM2_RH_PLATFORM; 72 else 73 return CMD_RET_USAGE; 74 75 return report_return_code(tpm2_clear(handle, pw, pw_sz)); 76 } 77 78 static int do_tpm2_pcr_extend(cmd_tbl_t *cmdtp, int flag, int argc, 79 char * const argv[]) 80 { 81 struct udevice *dev; 82 struct tpm_chip_priv *priv; 83 u32 index = simple_strtoul(argv[1], NULL, 0); 84 void *digest = map_sysmem(simple_strtoul(argv[2], NULL, 0), 0); 85 int ret; 86 u32 rc; 87 88 if (argc != 3) 89 return CMD_RET_USAGE; 90 91 ret = uclass_first_device_err(UCLASS_TPM, &dev); 92 if (ret) 93 return ret; 94 95 priv = dev_get_uclass_priv(dev); 96 if (!priv) 97 return -EINVAL; 98 99 if (index >= priv->pcr_count) 100 return -EINVAL; 101 102 rc = tpm2_pcr_extend(index, digest); 103 104 unmap_sysmem(digest); 105 106 return report_return_code(rc); 107 } 108 109 static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag, int argc, 110 char * const argv[]) 111 { 112 struct udevice *dev; 113 struct tpm_chip_priv *priv; 114 u32 index, rc; 115 unsigned int updates; 116 void *data; 117 int ret; 118 119 if (argc != 3) 120 return CMD_RET_USAGE; 121 122 ret = uclass_first_device_err(UCLASS_TPM, &dev); 123 if (ret) 124 return ret; 125 126 priv = dev_get_uclass_priv(dev); 127 if (!priv) 128 return -EINVAL; 129 130 index = simple_strtoul(argv[1], NULL, 0); 131 if (index >= priv->pcr_count) 132 return -EINVAL; 133 134 data = map_sysmem(simple_strtoul(argv[2], NULL, 0), 0); 135 136 rc = tpm2_pcr_read(index, priv->pcr_select_min, data, &updates); 137 if (!rc) { 138 printf("PCR #%u content (%d known updates):\n", index, updates); 139 print_byte_string(data, TPM2_DIGEST_LEN); 140 } 141 142 unmap_sysmem(data); 143 144 return report_return_code(rc); 145 } 146 147 static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag, int argc, 148 char * const argv[]) 149 { 150 u32 capability, property, rc; 151 u8 *data; 152 size_t count; 153 int i, j; 154 155 if (argc != 5) 156 return CMD_RET_USAGE; 157 158 capability = simple_strtoul(argv[1], NULL, 0); 159 property = simple_strtoul(argv[2], NULL, 0); 160 data = map_sysmem(simple_strtoul(argv[3], NULL, 0), 0); 161 count = simple_strtoul(argv[4], NULL, 0); 162 163 rc = tpm2_get_capability(capability, property, data, count); 164 if (rc) 165 goto unmap_data; 166 167 printf("Capabilities read from TPM:\n"); 168 for (i = 0; i < count; i++) { 169 printf("Property 0x"); 170 for (j = 0; j < 4; j++) 171 printf("%02x", data[(i * 8) + j]); 172 printf(": 0x"); 173 for (j = 4; j < 8; j++) 174 printf("%02x", data[(i * 8) + j]); 175 printf("\n"); 176 } 177 178 unmap_data: 179 unmap_sysmem(data); 180 181 return report_return_code(rc); 182 } 183 184 static cmd_tbl_t tpm2_commands[] = { 185 U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""), 186 U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_init, "", ""), 187 U_BOOT_CMD_MKENT(startup, 0, 1, do_tpm2_startup, "", ""), 188 U_BOOT_CMD_MKENT(self_test, 0, 1, do_tpm2_self_test, "", ""), 189 U_BOOT_CMD_MKENT(clear, 0, 1, do_tpm2_clear, "", ""), 190 U_BOOT_CMD_MKENT(pcr_extend, 0, 1, do_tpm2_pcr_extend, "", ""), 191 U_BOOT_CMD_MKENT(pcr_read, 0, 1, do_tpm_pcr_read, "", ""), 192 U_BOOT_CMD_MKENT(get_capability, 0, 1, do_tpm_get_capability, "", ""), 193 }; 194 195 cmd_tbl_t *get_tpm_commands(unsigned int *size) 196 { 197 *size = ARRAY_SIZE(tpm2_commands); 198 199 return tpm2_commands; 200 } 201 202 U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPMv2.x command", 203 "<command> [<arguments>]\n" 204 "\n" 205 "info\n" 206 " Show information about the TPM.\n" 207 "init\n" 208 " Initialize the software stack. Always the first command to issue.\n" 209 "startup <mode>\n" 210 " Issue a TPM2_Startup command.\n" 211 " <mode> is one of:\n" 212 " * TPM2_SU_CLEAR (reset state)\n" 213 " * TPM2_SU_STATE (preserved state)\n" 214 "self_test <type>\n" 215 " Test the TPM capabilities.\n" 216 " <type> is one of:\n" 217 " * full (perform all tests)\n" 218 " * continue (only check untested tests)\n" 219 "clear <hierarchy>\n" 220 " Issue a TPM2_Clear command.\n" 221 " <hierarchy> is one of:\n" 222 " * TPM2_RH_LOCKOUT\n" 223 " * TPM2_RH_PLATFORM\n" 224 "pcr_extend <pcr> <digest_addr>\n" 225 " Extend PCR #<pcr> with digest at <digest_addr>.\n" 226 " <pcr>: index of the PCR\n" 227 " <digest_addr>: address of a 32-byte SHA256 digest\n" 228 "pcr_read <pcr> <digest_addr>\n" 229 " Read PCR #<pcr> to memory address <digest_addr>.\n" 230 " <pcr>: index of the PCR\n" 231 " <digest_addr>: address to store the a 32-byte SHA256 digest\n" 232 "get_capability <capability> <property> <addr> <count>\n" 233 " Read and display <count> entries indexed by <capability>/<property>.\n" 234 " Values are 4 bytes long and are written at <addr>.\n" 235 " <capability>: capability\n" 236 " <property>: property\n" 237 " <addr>: address to store <count> entries of 4 bytes\n" 238 " <count>: number of entries to retrieve\n" 239 ); 240