All of lore.kernel.org
 help / color / mirror / Atom feed
From: Vitaly Chikunov <vt@altlinux.org>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
	linux-integrity@vger.kernel.org
Cc: Vitaly Chikunov <vt@altlinux.org>
Subject: [PATCH 2/3] ima-evm-utils: Add --xattr-user option for testing
Date: Mon, 26 Nov 2018 07:39:52 +0300	[thread overview]
Message-ID: <20181126043953.1126-2-vt@altlinux.org> (raw)
In-Reply-To: <20181126043953.1126-1-vt@altlinux.org>

Keep ima/evm attributes in user namespace instead of security namespace.
Would be useful for testing purposes without having root privileges,
easier to understand, and because --sigfile does not work for evm
signatures.

Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
---
 src/evmctl.c    | 32 ++++++++++++++++++++------------
 src/libimaevm.c |  2 +-
 2 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/src/evmctl.c b/src/evmctl.c
index 94d7ab1..032ea9d 100644
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -145,6 +145,9 @@ static int find(const char *path, int dts, find_cb_t func);
 struct command cmds[];
 static void print_usage(struct command *cmd);
 
+static const char *xattr_ima = "security.ima";
+static const char *xattr_evm = "security.evm";
+
 static int bin2file(const char *file, const char *ext, const unsigned char *data, int len)
 {
 	FILE *fp;
@@ -531,7 +534,7 @@ static int sign_evm(const char *file, const char *key)
 		dump(sig, len);
 
 	if (xattr) {
-		err = lsetxattr(file, "security.evm", sig, len, 0);
+		err = lsetxattr(file, xattr_evm, sig, len, 0);
 		if (err < 0) {
 			log_err("setxattr failed: %s\n", file);
 			return err;
@@ -569,7 +572,7 @@ static int hash_ima(const char *file)
 		dump(hash, len);
 
 	if (xattr) {
-		err = lsetxattr(file, "security.ima", hash, len, 0);
+		err = lsetxattr(file, xattr_ima, hash, len, 0);
 		if (err < 0) {
 			log_err("setxattr failed: %s\n", file);
 			return err;
@@ -604,7 +607,7 @@ static int sign_ima(const char *file, const char *key)
 		bin2file(file, "sig", sig, len);
 
 	if (xattr) {
-		err = lsetxattr(file, "security.ima", sig, len, 0);
+		err = lsetxattr(file, xattr_ima, sig, len, 0);
 		if (err < 0) {
 			log_err("setxattr failed: %s\n", file);
 			return err;
@@ -771,14 +774,14 @@ static int verify_evm(const char *file)
 	if (mdlen <= 1)
 		return mdlen;
 
-	len = lgetxattr(file, "security.evm", sig, sizeof(sig));
+	len = lgetxattr(file, xattr_evm, sig, sizeof(sig));
 	if (len < 0) {
 		log_err("getxattr failed: %s\n", file);
 		return len;
 	}
 
 	if (sig[0] != 0x03) {
-		log_err("security.evm has no signature\n");
+		log_err("%s has no signature\n", xattr_evm);
 		return -1;
 	}
 
@@ -813,7 +816,7 @@ static int verify_ima(const char *file)
 		memcpy(sig, tmp, len);
 		free(tmp);
 	} else {
-		len = lgetxattr(file, "security.ima", sig, sizeof(sig));
+		len = lgetxattr(file, xattr_ima, sig, sizeof(sig));
 		if (len < 0) {
 			log_err("getxattr failed: %s\n", file);
 			return len;
@@ -956,7 +959,7 @@ static int setxattr_ima(const char *file, char *sig_file)
 	if (!sig)
 		return 0;
 
-	err = lsetxattr(file, "security.ima", sig, len, 0);
+	err = lsetxattr(file, xattr_ima, sig, len, 0);
 	if (err < 0)
 		log_err("setxattr failed: %s\n", file);
 	free(sig);
@@ -1152,7 +1155,7 @@ static int hmac_evm(const char *file, const char *key)
 
 	if (xattr) {
 		sig[0] = EVM_XATTR_HMAC;
-		err = lsetxattr(file, "security.evm", sig, len + 1, 0);
+		err = lsetxattr(file, xattr_evm, sig, len + 1, 0);
 		if (err < 0) {
 			log_err("setxattr failed: %s\n", file);
 			return err;
@@ -1208,9 +1211,9 @@ static int ima_fix(const char *path)
 		}
 		for (; size > 0; len++, size -= len, list += len) {
 			len = strlen(list);
-			if (!strcmp(list, "security.ima"))
+			if (!strcmp(list, xattr_ima))
 				ima = 1;
-			else if (!strcmp(list, "security.evm"))
+			else if (!strcmp(list, xattr_evm))
 				evm = 1;
 		}
 		if (ima && evm)
@@ -1287,8 +1290,8 @@ static int cmd_ima_fix(struct command *cmd)
 static int ima_clear(const char *path)
 {
 	log_info("%s\n", path);
-	lremovexattr(path, "security.ima");
-	lremovexattr(path, "security.evm");
+	lremovexattr(path, xattr_ima);
+	lremovexattr(path, xattr_evm);
 
 	return 0;
 }
@@ -1718,6 +1721,7 @@ static struct option opts[] = {
 	{"selinux", 1, 0, 136},
 	{"caps", 2, 0, 137},
 	{"list", 0, 0, 138},
+	{"xattr-user", 0, 0, 140},
 	{}
 
 };
@@ -1869,6 +1873,10 @@ int main(int argc, char *argv[])
 		case 138:
 			measurement_list = 1;
 			break;
+		case 140: /* --xattr-user */
+			xattr_ima = "user.ima";
+			xattr_evm = "user.evm";
+			break;
 		case '?':
 			exit(1);
 			break;
diff --git a/src/libimaevm.c b/src/libimaevm.c
index 6fa0ed4..714f1ac 100644
--- a/src/libimaevm.c
+++ b/src/libimaevm.c
@@ -594,7 +594,7 @@ int ima_verify_signature(const char *file, unsigned char *sig, int siglen,
 	int hashlen, sig_hash_algo;
 
 	if (sig[0] != 0x03) {
-		log_err("security.ima has no signature\n");
+		log_err("xattr ima has no signature\n");
 		return -1;
 	}
 
-- 
2.11.0


  reply	other threads:[~2018-11-26  4:40 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-26  4:39 [PATCH 1/3] ima-avm-utils: Fix hash buffer overflow in verify_evm Vitaly Chikunov
2018-11-26  4:39 ` Vitaly Chikunov [this message]
2018-11-27 11:55   ` [PATCH 2/3] ima-evm-utils: Add --xattr-user option for testing Mimi Zohar
2018-11-26  4:39 ` [PATCH 3/3] ima-evm-utils: Allow to use Streebog hash function Vitaly Chikunov
2018-11-27 11:56   ` Mimi Zohar
2018-11-27 13:08     ` Vitaly Chikunov
2018-11-27 13:33       ` Mimi Zohar
2018-11-26 13:45 ` [PATCH 1/3] ima-avm-utils: Fix hash buffer overflow in verify_evm Vitaly Chikunov
2018-11-27 11:52 ` Mimi Zohar

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20181126043953.1126-2-vt@altlinux.org \
    --to=vt@altlinux.org \
    --cc=dmitry.kasatkin@gmail.com \
    --cc=linux-integrity@vger.kernel.org \
    --cc=zohar@linux.vnet.ibm.com \
    --subject='Re: [PATCH 2/3] ima-evm-utils: Add --xattr-user option for testing' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.