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From: Stefan Berger <stefanb@linux.ibm.com>
To: linux-integrity@vger.kernel.org
Cc: zohar@linux.ibm.com, Stefan Berger <stefanb@linux.ibm.com>
Subject: [PATCH ima-evm-utils v2 3/4] libimaevm: Remove calculation of a digest over a directory
Date: Thu,  8 Jul 2021 12:04:07 -0400	[thread overview]
Message-ID: <20210708160408.2779849-4-stefanb@linux.ibm.com> (raw)
In-Reply-To: <20210708160408.2779849-1-stefanb@linux.ibm.com>

Signature verification on directories is not supported by IMA in the
kernel, so remove the calculation of digests over directories.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
---
 src/libimaevm.c | 37 -------------------------------------
 1 file changed, 37 deletions(-)

diff --git a/src/libimaevm.c b/src/libimaevm.c
index 4d51901..07a25c9 100644
--- a/src/libimaevm.c
+++ b/src/libimaevm.c
@@ -177,40 +177,6 @@ out:
 	return err;
 }
 
-static int add_dir_hash(const char *file, EVP_MD_CTX *ctx)
-{
-	struct dirent *de;
-	DIR *dir;
-	unsigned long long ino;
-	unsigned int type;
-	int result = 0;
-
-	dir = opendir(file);
-	if (!dir) {
-		log_err("Failed to open: %s\n", file);
-		return -1;
-	}
-
-	while ((de = readdir(dir))) {
-		ino = de->d_ino;
-		type = de->d_type;
-		log_debug("entry: %s, ino: %llu, type: %u, reclen: %hu\n",
-			  de->d_name, ino, type, de->d_reclen);
-		if (EVP_DigestUpdate(ctx, de->d_name, strlen(de->d_name)) != 1 ||
-		    EVP_DigestUpdate(ctx, &ino, sizeof(ino)) != 1||
-		    EVP_DigestUpdate(ctx, &type, sizeof(type)) != 1) {
-			log_err("EVP_DigestUpdate() failed\n");
-			output_openssl_errors();
-			result = 1;
-			break;
-		}
-	}
-
-	closedir(dir);
-
-	return result;
-}
-
 static int add_link_hash(const char *path, EVP_MD_CTX *ctx)
 {
 	int len;
@@ -265,9 +231,6 @@ int ima_calc_hash(const char *file, uint8_t *hash)
 	case S_IFREG:
 		err = add_file_hash(file, pctx);
 		break;
-	case S_IFDIR:
-		err = add_dir_hash(file, pctx);
-		break;
 	case S_IFLNK:
 		err = add_link_hash(file, pctx);
 		break;
-- 
2.31.1


  parent reply	other threads:[~2021-07-08 16:04 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-08 16:04 [PATCH ima-evm-utils v2 0/4] libimaevm: Remove digest calculations not supported by IMA Stefan Berger
2021-07-08 16:04 ` [PATCH ima-evm-utils v2 1/4] evmctl: Remove filtering support for file types unsupported " Stefan Berger
2021-07-08 16:04 ` [PATCH ima-evm-utils v2 2/4] libimaevm: Remove calculation of a digest over a device file Stefan Berger
2021-07-08 16:04 ` Stefan Berger [this message]
2021-07-08 16:04 ` [PATCH ima-evm-utils v2 4/4] libimaevm: Remove calculation of a digest over a symbolic link Stefan Berger

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