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ima-evm-utils: add support in tpm2_read_pcrs to read different TPM banks

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tpm2_read_pcrs() reads the sha1 PCRs in order to verify the measurmeent
list.  This patch adds support for reading other TPM banks.

Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Mimi Zohar
2020-02-17 21:11:58 -05:00
parent 696bf0b108
commit 2f482a6989
1 changed files with 7 additions and 4 deletions
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11
src/evmctl.c
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@@ -1423,14 +1423,16 @@ static int tpm_pcr_read(int idx, uint8_t *pcr, int len)
}
#ifdef HAVE_TSSPCRREAD
static int tpm2_pcr_read(int idx, uint8_t *hwpcr, int len, char **errmsg)
static int tpm2_pcr_read(const char *algo_name, int idx, uint8_t *hwpcr,
int len, char **errmsg)
{
FILE *fp;
char pcr[100]; /* may contain an error */
char cmd[50];
int ret;
sprintf(cmd, "tsspcrread -halg sha1 -ha %d -ns 2> /dev/null", idx);
sprintf(cmd, "tsspcrread -halg %s -ha %d -ns 2> /dev/null",
algo_name, idx);
fp = popen(cmd, "r");
if (!fp) {
ret = asprintf(errmsg, "popen failed: %s", strerror(errno));
@@ -1456,7 +1458,7 @@ static int tpm2_pcr_read(int idx, uint8_t *hwpcr, int len, char **errmsg)
ret = -1;
if (!ret)
hex2bin(hwpcr, pcr, SHA_DIGEST_LENGTH);
hex2bin(hwpcr, pcr, len);
else
*errmsg = strndup(pcr, strlen(pcr) - 1); /* remove newline */
@@ -1885,7 +1887,8 @@ static int ima_measurement(const char *file)
#ifdef HAVE_TSSPCRREAD
char *errmsg = NULL;
err = tpm2_pcr_read(i, hwpcr, sizeof(hwpcr), &errmsg);
err = tpm2_pcr_read("sha1", i, hwpcr, sizeof(hwpcr),
&errmsg);
if (err) {
log_info("Failed to read PCRs: (%s)\n", errmsg);
free(errmsg);