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https://github.com/ibm-s390-linux/s390-tools.git
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a84d1c5d58
With recent changes in the zcrypt device driver, the serial number of a crypto card can be obtained by reading the sysfs attribute 'serialnr' of a crypto card device of type CCA-Coprocessor. The sysfs attribute can be found under '/sys/devices/ap/cardnn/', where nn specifies the card number in hex. Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com> Reviewed-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
162 lines
3.3 KiB
C
162 lines
3.3 KiB
C
/*
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* zkey - Generate, re-encipher, and validate secure keys
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*
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* Copyright IBM Corp. 2019
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <err.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "lib/util_path.h"
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#include "lib/util_file.h"
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#include "utils.h"
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#define pr_verbose(verbose, fmt...) do { \
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if (verbose) \
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warnx(fmt); \
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} while (0)
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/**
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* Checks if the specified card is of type CCA and is online
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*
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* @param[in] card card number
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*
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* @returns 1 if its a CCA card and is online, 0 if offline and -1 if its
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* not a CCA card.
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*/
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int sysfs_is_card_online(int card)
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{
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long int online;
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char *dev_path;
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char type[20];
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int rc = 1;
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dev_path = util_path_sysfs("bus/ap/devices/card%02x", card);
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if (!util_path_is_dir(dev_path)) {
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rc = 0;
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goto out;
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}
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if (util_file_read_l(&online, 10, "%s/online", dev_path) != 0) {
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rc = 0;
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goto out;
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}
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if (online == 0) {
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rc = 0;
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goto out;
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}
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if (util_file_read_line(type, sizeof(type), "%s/type", dev_path) != 0) {
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rc = 0;
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goto out;
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}
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if (strncmp(type, "CEX", 3) != 0 || strlen(type) < 5) {
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rc = 0;
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goto out;
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}
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if (type[4] != 'C') {
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rc = -1;
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goto out;
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}
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out:
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free(dev_path);
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return rc;
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}
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/**
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* Checks if the specified APQN is of type CCA and is online
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*
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* @param[in] card card number
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* @param[in] domain the domain
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*
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* @returns 1 if its a CCA card and is online, 0 if offline and -1 if its
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* not a CCA card.
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*/
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int sysfs_is_apqn_online(int card, int domain)
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{
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long int online;
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char *dev_path;
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int rc = 1;
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rc = sysfs_is_card_online(card);
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if (rc != 1)
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return rc;
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dev_path = util_path_sysfs("bus/ap/devices/card%02x/%02x.%04x", card,
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card, domain);
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if (!util_path_is_dir(dev_path)) {
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rc = 0;
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goto out;
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}
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if (util_file_read_l(&online, 10, "%s/online", dev_path) != 0) {
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rc = 0;
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goto out;
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}
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if (online == 0) {
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rc = 0;
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goto out;
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}
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out:
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free(dev_path);
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return rc;
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}
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/**
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* Gets the 8 character ASCII serial number string of an card from the sysfs.
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*
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* @param[in] card card number
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* @param[out] serialnr Result buffer
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* @param[in] verbose if true, verbose messages are printed
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*
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* @returns 0 if the serial number was returned. -ENODEV if the APQN is not
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* available, or is not a CCA card. -ENOTSUP if the serialnr sysfs
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* attribute is not available, because the zcrypt kernel module is
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* on an older level.
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*/
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int sysfs_get_serialnr(int card, char serialnr[9], bool verbose)
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{
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char *dev_path;
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int rc = 0;
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if (serialnr == NULL)
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return -EINVAL;
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if (sysfs_is_card_online(card) != 1)
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return -ENODEV;
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dev_path = util_path_sysfs("bus/ap/devices/card%02x", card);
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if (!util_path_is_dir(dev_path)) {
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rc = -ENODEV;
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goto out;
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}
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if (util_file_read_line(serialnr, 9, "%s/serialnr", dev_path) != 0) {
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rc = -ENOTSUP;
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goto out;
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}
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if (strlen(serialnr) == 0) {
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rc = -ENODEV;
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goto out;
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}
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pr_verbose(verbose, "Serial number of %02x: %s", card, serialnr);
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out:
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if (rc != 0)
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pr_verbose(verbose, "Failed to get serial number for "
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"%02x: %s", card, strerror(-rc));
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free(dev_path);
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return rc;
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}
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