From: Roberto Sassu <roberto.sassu@huawei.com> To: <linux-ima-devel@lists.sourceforge.net> Cc: <linux-security-module@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>, <linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>, Roberto Sassu <roberto.sassu@huawei.com> Subject: [PATCH 07/12] ima: added parser for compact digest list Date: Tue, 25 Jul 2017 17:44:18 +0200 [thread overview] Message-ID: <20170725154423.24845-8-roberto.sassu@huawei.com> (raw) In-Reply-To: <20170725154423.24845-1-roberto.sassu@huawei.com> This patch introduces the parser for the compact digest list. Its format is: entry_id[2] count[4] data_len[4] data[data_len] entry_id[2] count[4] data_len[4] data[data_len] ... The parser supports the COMPACT_LIST_ID_DIGEST entry ID. This format is suitable to store a large number of digests, as there is no metadata provided for each. Digests (which have all the same size) are concatenated together and placed after the header. Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> --- security/integrity/ima/ima_digest_list.c | 60 ++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/security/integrity/ima/ima_digest_list.c b/security/integrity/ima/ima_digest_list.c index 3e1ff69b..c1ef79a 100644 --- a/security/integrity/ima/ima_digest_list.c +++ b/security/integrity/ima/ima_digest_list.c @@ -23,6 +23,63 @@ enum digest_metadata_fields {DATA_ALGO, DATA_DIGEST, DATA_SIGNATURE, DATA_FILE_PATH, DATA_REF_ID, DATA_TYPE, DATA__LAST}; +enum digest_data_types {DATA_TYPE_COMPACT_LIST}; + +enum compact_list_entry_ids {COMPACT_LIST_ID_DIGEST}; + +struct compact_list_hdr { + u16 entry_id; + u32 count; + u32 datalen; +} __packed; + +static int ima_parse_compact_list(loff_t size, void *buf) +{ + void *bufp = buf, *bufendp = buf + size; + int digest_len = hash_digest_size[ima_hash_algo]; + struct compact_list_hdr *hdr; + int ret, i; + + while (bufp < bufendp) { + if (bufp + sizeof(*hdr) > bufendp) { + pr_err("compact list, missing header\n"); + return -EINVAL; + } + + hdr = bufp; + + if (ima_canonical_fmt) { + hdr->entry_id = le16_to_cpu(hdr->entry_id); + hdr->count = le32_to_cpu(hdr->count); + hdr->datalen = le32_to_cpu(hdr->datalen); + } + + if (hdr->entry_id != COMPACT_LIST_ID_DIGEST) { + pr_err("compact list, invalid data type\n"); + return -EINVAL; + } + + bufp += sizeof(*hdr); + + for (i = 0; i < hdr->count && + bufp + digest_len <= bufendp; i++) { + ret = ima_add_digest_data_entry(bufp); + if (ret < 0 && ret != -EEXIST) + return ret; + + bufp += digest_len; + } + + if (i != hdr->count || + bufp != (void *)hdr + sizeof(*hdr) + hdr->datalen) { + pr_err("compact list, invalid data\n"); + return -EINVAL; + } + } + + return 0; +} + static int ima_parse_digest_list_data(struct ima_field_data *data) { void *digest_list; @@ -47,6 +104,9 @@ static int ima_parse_digest_list_data(struct ima_field_data *data) } switch (data_type) { + case DATA_TYPE_COMPACT_LIST: + ret = ima_parse_compact_list(digest_list_size, digest_list); + break; default: pr_err("Parser for data type %d not implemented\n", data_type); ret = -EINVAL; -- 2.9.3
WARNING: multiple messages have this Message-ID (diff)
From: roberto.sassu@huawei.com (Roberto Sassu) To: linux-security-module@vger.kernel.org Subject: [PATCH 07/12] ima: added parser for compact digest list Date: Tue, 25 Jul 2017 17:44:18 +0200 [thread overview] Message-ID: <20170725154423.24845-8-roberto.sassu@huawei.com> (raw) In-Reply-To: <20170725154423.24845-1-roberto.sassu@huawei.com> This patch introduces the parser for the compact digest list. Its format is: entry_id[2] count[4] data_len[4] data[data_len] entry_id[2] count[4] data_len[4] data[data_len] ... The parser supports the COMPACT_LIST_ID_DIGEST entry ID. This format is suitable to store a large number of digests, as there is no metadata provided for each. Digests (which have all the same size) are concatenated together and placed after the header. Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> --- security/integrity/ima/ima_digest_list.c | 60 ++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/security/integrity/ima/ima_digest_list.c b/security/integrity/ima/ima_digest_list.c index 3e1ff69b..c1ef79a 100644 --- a/security/integrity/ima/ima_digest_list.c +++ b/security/integrity/ima/ima_digest_list.c @@ -23,6 +23,63 @@ enum digest_metadata_fields {DATA_ALGO, DATA_DIGEST, DATA_SIGNATURE, DATA_FILE_PATH, DATA_REF_ID, DATA_TYPE, DATA__LAST}; +enum digest_data_types {DATA_TYPE_COMPACT_LIST}; + +enum compact_list_entry_ids {COMPACT_LIST_ID_DIGEST}; + +struct compact_list_hdr { + u16 entry_id; + u32 count; + u32 datalen; +} __packed; + +static int ima_parse_compact_list(loff_t size, void *buf) +{ + void *bufp = buf, *bufendp = buf + size; + int digest_len = hash_digest_size[ima_hash_algo]; + struct compact_list_hdr *hdr; + int ret, i; + + while (bufp < bufendp) { + if (bufp + sizeof(*hdr) > bufendp) { + pr_err("compact list, missing header\n"); + return -EINVAL; + } + + hdr = bufp; + + if (ima_canonical_fmt) { + hdr->entry_id = le16_to_cpu(hdr->entry_id); + hdr->count = le32_to_cpu(hdr->count); + hdr->datalen = le32_to_cpu(hdr->datalen); + } + + if (hdr->entry_id != COMPACT_LIST_ID_DIGEST) { + pr_err("compact list, invalid data type\n"); + return -EINVAL; + } + + bufp += sizeof(*hdr); + + for (i = 0; i < hdr->count && + bufp + digest_len <= bufendp; i++) { + ret = ima_add_digest_data_entry(bufp); + if (ret < 0 && ret != -EEXIST) + return ret; + + bufp += digest_len; + } + + if (i != hdr->count || + bufp != (void *)hdr + sizeof(*hdr) + hdr->datalen) { + pr_err("compact list, invalid data\n"); + return -EINVAL; + } + } + + return 0; +} + static int ima_parse_digest_list_data(struct ima_field_data *data) { void *digest_list; @@ -47,6 +104,9 @@ static int ima_parse_digest_list_data(struct ima_field_data *data) } switch (data_type) { + case DATA_TYPE_COMPACT_LIST: + ret = ima_parse_compact_list(digest_list_size, digest_list); + break; default: pr_err("Parser for data type %d not implemented\n", data_type); ret = -EINVAL; -- 2.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2017-07-25 15:51 UTC|newest] Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-07-25 15:44 [PATCH 00/12] ima: measure digest lists instead of individual files Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-25 15:44 ` [PATCH 01/12] ima: generalize ima_read_policy() Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-25 15:44 ` [PATCH 02/12] ima: generalize ima_write_policy() Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-25 15:44 ` [PATCH 03/12] ima: generalize policy file operations Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-25 15:44 ` [PATCH 04/12] ima: use ima_show_htable_value to show hash table data Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-25 15:44 ` [PATCH 05/12] ima: add functions to manage digest lists Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-25 15:44 ` [PATCH 06/12] ima: added parser of digest lists metadata Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-27 5:15 ` kbuild test robot 2017-07-27 5:15 ` kbuild test robot 2017-08-01 10:17 ` [PATCH, RESEND " Roberto Sassu 2017-08-01 10:17 ` Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu [this message] 2017-07-25 15:44 ` [PATCH 07/12] ima: added parser for compact digest list Roberto Sassu 2017-07-25 15:44 ` [PATCH 08/12] ima: added parser for RPM data type Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-27 5:03 ` kbuild test robot 2017-07-27 5:03 ` kbuild test robot 2017-08-01 10:20 ` [PATCH, RESEND " Roberto Sassu 2017-08-01 10:20 ` Roberto Sassu 2017-08-01 10:27 ` Christoph Hellwig 2017-08-01 10:27 ` Christoph Hellwig 2017-08-01 10:58 ` Roberto Sassu 2017-08-01 10:58 ` Roberto Sassu 2017-08-01 10:58 ` Roberto Sassu 2017-08-02 7:22 ` [Linux-ima-devel] " James Morris 2017-08-02 7:22 ` James Morris 2017-08-02 7:22 ` James Morris 2017-08-02 11:22 ` Roberto Sassu 2017-08-02 11:22 ` Roberto Sassu 2017-08-02 11:22 ` Roberto Sassu 2017-08-09 9:15 ` Roberto Sassu 2017-08-09 9:15 ` Roberto Sassu 2017-08-09 9:15 ` Roberto Sassu 2017-08-09 14:30 ` Mimi Zohar 2017-08-09 14:30 ` Mimi Zohar 2017-08-09 14:30 ` Mimi Zohar 2017-08-09 17:18 ` Roberto Sassu 2017-08-09 17:18 ` Roberto Sassu 2017-08-09 17:18 ` Roberto Sassu 2017-08-10 13:12 ` Mimi Zohar 2017-08-10 13:12 ` Mimi Zohar 2017-08-10 13:12 ` Mimi Zohar 2017-08-17 9:15 ` Roberto Sassu 2017-08-17 9:15 ` Roberto Sassu 2017-08-17 9:15 ` Roberto Sassu 2017-07-25 15:44 ` [PATCH 09/12] ima: introduce securityfs interfaces for digest lists Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-27 5:38 ` kbuild test robot 2017-07-27 5:38 ` kbuild test robot 2017-07-25 15:44 ` [PATCH 10/12] ima: disable digest lookup if digest lists are not measured Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-07-25 15:44 ` [PATCH 11/12] ima: don't report measurements if digests are included in the loaded lists Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-08-09 20:36 ` [Linux-ima-devel] " Ken Goldman 2017-08-09 20:36 ` Ken Goldman 2017-08-17 8:32 ` Roberto Sassu 2017-08-17 8:32 ` Roberto Sassu 2017-07-25 15:44 ` [PATCH 12/12] ima: added Documentation/security/IMA-digest-lists.txt Roberto Sassu 2017-07-25 15:44 ` Roberto Sassu 2017-12-05 22:28 ` [Linux-ima-devel] " Ken Goldman 2017-12-06 9:22 ` Roberto Sassu 2017-12-06 9:22 ` Roberto Sassu 2017-07-26 21:54 ` [PATCH 00/12] ima: measure digest lists instead of individual files Mimi Zohar 2017-07-26 21:54 ` Mimi Zohar
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