/*
 * Copyright (C) 2013 Intel Corporation
 *
 * Author:
 * Dmitry Kasatkin <dmitry.kasatkin@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2 of the License.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/err.h>
#include <linux/ratelimit.h>
#include <linux/key-type.h>
#include <crypto/public_key.h>
#include <crypto/hash_info.h>
#include <keys/asymmetric-type.h>
#include <keys/system_keyring.h>

#include "integrity.h"

/*
 * Request an asymmetric key.
 */
static struct key *request_asymmetric_key(struct key *keyring, uint32_t keyid)
{
	struct key *key;
	char name[12];

	sprintf(name, "id:%08x", keyid);

	pr_debug("key search: \"%s\"\n", name);

	key = get_ima_blacklist_keyring();
	if (key) {
		key_ref_t kref;

		kref = keyring_search(make_key_ref(key, 1),
				     &key_type_asymmetric, name);
		if (!IS_ERR(kref)) {
			pr_err("Key '%s' is in ima_blacklist_keyring\n", name);
			return ERR_PTR(-EKEYREJECTED);
		}
	}

	if (keyring) {
		/* search in specific keyring */
		key_ref_t kref;

		kref = keyring_search(make_key_ref(keyring, 1),
				      &key_type_asymmetric, name);
		if (IS_ERR(kref))
			key = ERR_CAST(kref);
		else
			key = key_ref_to_ptr(kref);
	} else {
		key = request_key(&key_type_asymmetric, name, NULL);
	}

	if (IS_ERR(key)) {
		pr_err_ratelimited("Request for unknown key '%s' err %ld\n",
				   name, PTR_ERR(key));
		switch (PTR_ERR(key)) {
			/* Hide some search errors */
		case -EACCES:
		case -ENOTDIR:
		case -EAGAIN:
			return ERR_PTR(-ENOKEY);
		default:
			return key;
		}
	}

	pr_debug("%s() = 0 [%x]\n", __func__, key_serial(key));

	return key;
}

int asymmetric_verify(struct key *keyring, const char *sig,
		      int siglen, const char *data, int datalen)
{
	struct public_key_signature pks;
	struct signature_v2_hdr *hdr = (struct signature_v2_hdr *)sig;
	struct key *key;
	int ret = -ENOMEM;

	if (siglen <= sizeof(*hdr))
		return -EBADMSG;

	siglen -= sizeof(*hdr);

	if (siglen != __be16_to_cpu(hdr->sig_size))
		return -EBADMSG;

	if (hdr->hash_algo >= HASH_ALGO__LAST)
		return -ENOPKG;

	key = request_asymmetric_key(keyring, __be32_to_cpu(hdr->keyid));
	if (IS_ERR(key))
		return PTR_ERR(key);

	memset(&pks, 0, sizeof(pks));

	pks.pkey_algo = "rsa";
	pks.hash_algo = hash_algo_name[hdr->hash_algo];
	pks.digest = (u8 *)data;
	pks.digest_size = datalen;
	pks.s = hdr->sig;
	pks.s_size = siglen;
	ret = verify_signature(key, &pks);
	key_put(key);
	pr_debug("%s() = %d\n", __func__, ret);
	return ret;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'>testing</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/ktest?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'>ktest</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-23 16:54:46 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-23 16:54:46 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/ktest?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'>6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/testing/ktest?id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'>49f73d917f1cd7d848e9a48c9efffea8ab2f7142</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/testing/ktest?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'>tools/testing/ktest</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/ktest?h=nds-private-remove&amp;id=eb3e8d9de28a5385f75e5c42eba5fb5b0c7625be'>eb3e8d9de28a5385f75e5c42eba5fb5b0c7625be</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/ktest?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4&amp;id2=eb3e8d9de28a5385f75e5c42eba5fb5b0c7625be'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/ktest?h=nds-private-remove&amp;id=c280f7736ab26a601932b1ce017a3840dbedcfdc'>c280f7736ab26a601932b1ce017a3840dbedcfdc</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/ktest?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4&amp;id2=c280f7736ab26a601932b1ce017a3840dbedcfdc'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip</div><div class='commit-msg'>Pull x86 fixes from Ingo Molnar:
 "There's a number of fixes:

   - a round of fixes for CPUID-less legacy CPUs
   - a number of microcode loader fixes
   - i8042 detection robustization fixes
   - stack dump/unwinder fixes
   - x86 SoC platform driver fixes
   - a GCC 7 warning fix
   - virtualization related fixes"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
  Revert "x86/unwind: Detect bad stack return address"
  x86/paravirt: Mark unused patch_default label
  x86/microcode/AMD: Reload proper initrd start address
  x86/platform/intel/quark: Add printf attribute to imr_self_test_result()
  x86/platform/intel-mid: Switch MPU3050 driver to IIO
  x86/alternatives: Do not use sync_core() to serialize I$
  x86/topology: Document cpu_llc_id
  x86/hyperv: Handle unknown NMIs on one CPU when unknown_nmi_panic
  x86/asm: Rewrite sync_core() to use IRET-to-self
  x86/microcode/intel: Replace sync_core() with native_cpuid()
  Revert "x86/boot: Fail the boot if !M486 and CPUID is missing"
  x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels
  x86/cpu: Probe CPUID leaf 6 even when cpuid_level == 6
  x86/tools: Fix gcc-7 warning in relocs.c
  x86/unwind: Dump stack data on warnings
  x86/unwind: Adjust last frame check for aligned function stacks
  x86/init: Fix a couple of comment typos
  x86/init: Remove i8042_detect() from platform ops
  Input: i8042 - Trust firmware a bit more when probing on X86
  x86/init: Add i8042 state to the platform data
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=6ac3bb167fed0b3d02b4fd3daa0d819841d5f6f4'>Diffstat</a> (limited to 'tools/testing/ktest')</div><table summary='diffstat' class='diffstat'>