drivers/char/tpm/tpm-sysfs.c

   1 /*
   2  * Copyright (C) 2004 IBM Corporation
   3  * Authors:
   4  * Leendert van Doorn <leendert@watson.ibm.com>
   5  * Dave Safford <safford@watson.ibm.com>
   6  * Reiner Sailer <sailer@watson.ibm.com>
   7  * Kylene Hall <kjhall@us.ibm.com>
   8  *
   9  * sysfs filesystem inspection interface to the TPM
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation, version 2 of the
  14  * License.
  15  *
  16  */
  17 #include <linux/device.h>
  18 #include "tpm.h"
  19
  20 /* XXX for now this helper is duplicated in tpm-interface.c */
  21 static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
  22                             int len, const char *desc)
  23 {
  24         int err;
  25
  26         len = tpm_transmit(chip, (u8 *) cmd, len);
  27         if (len <  0)
  28                 return len;
  29         else if (len < TPM_HEADER_SIZE)
  30                 return -EFAULT;
  31
  32         err = be32_to_cpu(cmd->header.out.return_code);
  33         if (err != 0 && desc)
  34                 dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
  35
  36         return err;
  37 }
  38
  39 #define READ_PUBEK_RESULT_SIZE 314
  40 #define TPM_ORD_READPUBEK cpu_to_be32(124)
  41 static struct tpm_input_header tpm_readpubek_header = {
  42         .tag = TPM_TAG_RQU_COMMAND,
  43         .length = cpu_to_be32(30),
  44         .ordinal = TPM_ORD_READPUBEK
  45 };
  46
  47 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
  48                        char *buf)
  49 {
  50         u8 *data;
  51         struct tpm_cmd_t tpm_cmd;
  52         ssize_t err;
  53         int i, rc;
  54         char *str = buf;
  55
  56         struct tpm_chip *chip = dev_get_drvdata(dev);
  57
  58         tpm_cmd.header.in = tpm_readpubek_header;
  59         err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
  60                            "attempting to read the PUBEK");
  61         if (err)
  62                 goto out;
  63
  64         /*
  65            ignore header 10 bytes
  66            algorithm 32 bits (1 == RSA )
  67            encscheme 16 bits
  68            sigscheme 16 bits
  69            parameters (RSA 12->bytes: keybit, #primes, expbit)
  70            keylenbytes 32 bits
  71            256 byte modulus
  72            ignore checksum 20 bytes
  73          */
  74         data = tpm_cmd.params.readpubek_out_buffer;
  75         str +=
  76             sprintf(str,
  77                     "Algorithm: %02X %02X %02X %02X\n"
  78                     "Encscheme: %02X %02X\n"
  79                     "Sigscheme: %02X %02X\n"
  80                     "Parameters: %02X %02X %02X %02X "
  81                     "%02X %02X %02X %02X "
  82                     "%02X %02X %02X %02X\n"
  83                     "Modulus length: %d\n"
  84                     "Modulus:\n",
  85                     data[0], data[1], data[2], data[3],
  86                     data[4], data[5],
  87                     data[6], data[7],
  88                     data[12], data[13], data[14], data[15],
  89                     data[16], data[17], data[18], data[19],
  90                     data[20], data[21], data[22], data[23],
  91                     be32_to_cpu(*((__be32 *) (data + 24))));
  92
  93         for (i = 0; i < 256; i++) {
  94                 str += sprintf(str, "%02X ", data[i + 28]);
  95                 if ((i + 1) % 16 == 0)
  96                         str += sprintf(str, "\n");
  97         }
  98 out:
  99         rc = str - buf;
 100         return rc;
 101 }
 102 EXPORT_SYMBOL_GPL(tpm_show_pubek);
 103
 104 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
 105                       char *buf)
 106 {
 107         cap_t cap;
 108         u8 digest[TPM_DIGEST_SIZE];
 109         ssize_t rc;
 110         int i, j, num_pcrs;
 111         char *str = buf;
 112         struct tpm_chip *chip = dev_get_drvdata(dev);
 113
 114         rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
 115                         "attempting to determine the number of PCRS");
 116         if (rc)
 117                 return 0;
 118
 119         num_pcrs = be32_to_cpu(cap.num_pcrs);
 120         for (i = 0; i < num_pcrs; i++) {
 121                 rc = tpm_pcr_read_dev(chip, i, digest);
 122                 if (rc)
 123                         break;
 124                 str += sprintf(str, "PCR-%02d: ", i);
 125                 for (j = 0; j < TPM_DIGEST_SIZE; j++)
 126                         str += sprintf(str, "%02X ", digest[j]);
 127                 str += sprintf(str, "\n");
 128         }
 129         return str - buf;
 130 }
 131 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
 132
 133 ssize_t tpm_show_enabled(struct device *dev, struct device_attribute *attr,
 134                         char *buf)
 135 {
 136         cap_t cap;
 137         ssize_t rc;
 138
 139         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
 140                          "attempting to determine the permanent enabled state");
 141         if (rc)
 142                 return 0;
 143
 144         rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
 145         return rc;
 146 }
 147 EXPORT_SYMBOL_GPL(tpm_show_enabled);
 148
 149 ssize_t tpm_show_active(struct device *dev, struct device_attribute *attr,
 150                         char *buf)
 151 {
 152         cap_t cap;
 153         ssize_t rc;
 154
 155         rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
 156                          "attempting to determine the permanent active state");
 157         if (rc)
 158                 return 0;
 159
 160         rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
 161         return rc;
 162 }
 163 EXPORT_SYMBOL_GPL(tpm_show_active);
 164
 165 ssize_t tpm_show_owned(struct device *dev, struct device_attribute *attr,
 166                         char *buf)
 167 {
 168         cap_t cap;
 169         ssize_t rc;
 170
 171         rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
 172                          "attempting to determine the owner state");
 173         if (rc)
 174                 return 0;
 175
 176         rc = sprintf(buf, "%d\n", cap.owned);
 177         return rc;
 178 }
 179 EXPORT_SYMBOL_GPL(tpm_show_owned);
 180
 181 ssize_t tpm_show_temp_deactivated(struct device *dev,
 182                                 struct device_attribute *attr, char *buf)
 183 {
 184         cap_t cap;
 185         ssize_t rc;
 186
 187         rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
 188                          "attempting to determine the temporary state");
 189         if (rc)
 190                 return 0;
 191
 192         rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
 193         return rc;
 194 }
 195 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
 196
 197 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
 198                       char *buf)
 199 {
 200         cap_t cap;
 201         ssize_t rc;
 202         char *str = buf;
 203
 204         rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
 205                         "attempting to determine the manufacturer");
 206         if (rc)
 207                 return 0;
 208         str += sprintf(str, "Manufacturer: 0x%x\n",
 209                        be32_to_cpu(cap.manufacturer_id));
 210
 211         /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
 212         rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
 213                          "attempting to determine the 1.2 version");
 214         if (!rc) {
 215                 str += sprintf(str,
 216                                "TCG version: %d.%d\nFirmware version: %d.%d\n",
 217                                cap.tpm_version_1_2.Major,
 218                                cap.tpm_version_1_2.Minor,
 219                                cap.tpm_version_1_2.revMajor,
 220                                cap.tpm_version_1_2.revMinor);
 221         } else {
 222                 /* Otherwise just use TPM_STRUCT_VER */
 223                 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
 224                                 "attempting to determine the 1.1 version");
 225                 if (rc)
 226                         return 0;
 227                 str += sprintf(str,
 228                                "TCG version: %d.%d\nFirmware version: %d.%d\n",
 229                                cap.tpm_version.Major,
 230                                cap.tpm_version.Minor,
 231                                cap.tpm_version.revMajor,
 232                                cap.tpm_version.revMinor);
 233         }
 234
 235         return str - buf;
 236 }
 237 EXPORT_SYMBOL_GPL(tpm_show_caps);
 238
 239 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
 240                         const char *buf, size_t count)
 241 {
 242         struct tpm_chip *chip = dev_get_drvdata(dev);
 243         if (chip == NULL)
 244                 return 0;
 245
 246         chip->vendor.cancel(chip);
 247         return count;
 248 }
 249 EXPORT_SYMBOL_GPL(tpm_store_cancel);
 250
 251 ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
 252                           char *buf)
 253 {
 254         struct tpm_chip *chip = dev_get_drvdata(dev);
 255
 256         if (chip->vendor.duration[TPM_LONG] == 0)
 257                 return 0;
 258
 259         return sprintf(buf, "%d %d %d [%s]\n",
 260                        jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
 261                        jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
 262                        jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
 263                        chip->vendor.duration_adjusted
 264                        ? "adjusted" : "original");
 265 }
 266 EXPORT_SYMBOL_GPL(tpm_show_durations);
 267
 268 ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
 269                           char *buf)
 270 {
 271         struct tpm_chip *chip = dev_get_drvdata(dev);
 272
 273         return sprintf(buf, "%d %d %d %d [%s]\n",
 274                        jiffies_to_usecs(chip->vendor.timeout_a),
 275                        jiffies_to_usecs(chip->vendor.timeout_b),
 276                        jiffies_to_usecs(chip->vendor.timeout_c),
 277                        jiffies_to_usecs(chip->vendor.timeout_d),
 278                        chip->vendor.timeout_adjusted
 279                        ? "adjusted" : "original");
 280 }
 281 EXPORT_SYMBOL_GPL(tpm_show_timeouts);