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Message-Id: <20220325223824.310119-3-zohar@linux.ibm.com>
Date: Fri, 25 Mar 2022 18:38:21 -0400
From: Mimi Zohar <zohar@...ux.ibm.com>
To: linux-integrity@...r.kernel.org
Cc: Mimi Zohar <zohar@...ux.ibm.com>,
Eric Biggers <ebiggers@...nel.org>,
Stefan Berger <stefanb@...ux.ibm.com>,
linux-fscrypt@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v7 2/5] ima: define a new template field named 'd-ngv2' and templates
In preparation to differentiate between unsigned regular IMA file
hashes and fs-verity's file digests in the IMA measurement list,
define a new template field named 'd-ngv2'.
Also define two new templates named 'ima-ngv2' and 'ima-sigv2', which
include the new 'd-ngv2' field.
Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
---
.../admin-guide/kernel-parameters.txt | 3 +-
security/integrity/ima/ima_template.c | 4 +
security/integrity/ima/ima_template_lib.c | 78 ++++++++++++++++---
security/integrity/ima/ima_template_lib.h | 4 +
4 files changed, 79 insertions(+), 10 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f5a27f067db9..47386ac10471 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1876,7 +1876,8 @@
ima_template= [IMA]
Select one of defined IMA measurements template formats.
- Formats: { "ima" | "ima-ng" | "ima-sig" }
+ Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
+ "ima-sigv2" }
Default: "ima-ng"
ima_template_fmt=
diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index db1ad6d7a57f..c25079faa208 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -20,6 +20,8 @@ static struct ima_template_desc builtin_templates[] = {
{.name = IMA_TEMPLATE_IMA_NAME, .fmt = IMA_TEMPLATE_IMA_FMT},
{.name = "ima-ng", .fmt = "d-ng|n-ng"},
{.name = "ima-sig", .fmt = "d-ng|n-ng|sig"},
+ {.name = "ima-ngv2", .fmt = "d-ngv2|n-ng"},
+ {.name = "ima-sigv2", .fmt = "d-ngv2|n-ng|sig"},
{.name = "ima-buf", .fmt = "d-ng|n-ng|buf"},
{.name = "ima-modsig", .fmt = "d-ng|n-ng|sig|d-modsig|modsig"},
{.name = "evm-sig",
@@ -38,6 +40,8 @@ static const struct ima_template_field supported_fields[] = {
.field_show = ima_show_template_string},
{.field_id = "d-ng", .field_init = ima_eventdigest_ng_init,
.field_show = ima_show_template_digest_ng},
+ {.field_id = "d-ngv2", .field_init = ima_eventdigest_ngv2_init,
+ .field_show = ima_show_template_digest_ngv2},
{.field_id = "n-ng", .field_init = ima_eventname_ng_init,
.field_show = ima_show_template_string},
{.field_id = "sig", .field_init = ima_eventsig_init,
diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c
index 7155d17a3b75..af269b94b369 100644
--- a/security/integrity/ima/ima_template_lib.c
+++ b/security/integrity/ima/ima_template_lib.c
@@ -24,11 +24,22 @@ static bool ima_template_hash_algo_allowed(u8 algo)
enum data_formats {
DATA_FMT_DIGEST = 0,
DATA_FMT_DIGEST_WITH_ALGO,
+ DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO,
DATA_FMT_STRING,
DATA_FMT_HEX,
DATA_FMT_UINT
};
+enum digest_type {
+ DIGEST_TYPE_IMA,
+ DIGEST_TYPE__LAST
+};
+
+#define DIGEST_TYPE_NAME_LEN_MAX 4 /* including NULL */
+static const char * const digest_type_name[DIGEST_TYPE__LAST] = {
+ [DIGEST_TYPE_IMA] = "ima"
+};
+
static int ima_write_template_field_data(const void *data, const u32 datalen,
enum data_formats datafmt,
struct ima_field_data *field_data)
@@ -72,8 +83,9 @@ static void ima_show_template_data_ascii(struct seq_file *m,
u32 buflen = field_data->len;
switch (datafmt) {
+ case DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO:
case DATA_FMT_DIGEST_WITH_ALGO:
- buf_ptr = strnchr(field_data->data, buflen, ':');
+ buf_ptr = strrchr(field_data->data, ':');
if (buf_ptr != field_data->data)
seq_printf(m, "%s", field_data->data);
@@ -178,6 +190,14 @@ void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show,
field_data);
}
+void ima_show_template_digest_ngv2(struct seq_file *m, enum ima_show_type show,
+ struct ima_field_data *field_data)
+{
+ ima_show_template_field_data(m, show,
+ DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO,
+ field_data);
+}
+
void ima_show_template_string(struct seq_file *m, enum ima_show_type show,
struct ima_field_data *field_data)
{
@@ -265,26 +285,39 @@ int ima_parse_buf(void *bufstartp, void *bufendp, void **bufcurp,
}
static int ima_eventdigest_init_common(const u8 *digest, u32 digestsize,
- u8 hash_algo,
+ u8 digest_type, u8 hash_algo,
struct ima_field_data *field_data)
{
/*
* digest formats:
* - DATA_FMT_DIGEST: digest
* - DATA_FMT_DIGEST_WITH_ALGO: [<hash algo>] + ':' + '\0' + digest,
+ * - DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO:
+ * [<digest type> + ':' + <hash algo>] + ':' + '\0' + digest,
+ * where <hash type> is either "ima" or "verity",
* where <hash algo> is provided if the hash algorithm is not
* SHA1 or MD5
*/
- u8 buffer[CRYPTO_MAX_ALG_NAME + 2 + IMA_MAX_DIGEST_SIZE] = { 0 };
+ u8 buffer[DIGEST_TYPE_NAME_LEN_MAX + CRYPTO_MAX_ALG_NAME + 2 +
+ IMA_MAX_DIGEST_SIZE] = { 0 };
enum data_formats fmt = DATA_FMT_DIGEST;
u32 offset = 0;
- if (hash_algo < HASH_ALGO__LAST) {
- fmt = DATA_FMT_DIGEST_WITH_ALGO;
- offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1, "%s",
+ if (digest_type < DIGEST_TYPE__LAST && hash_algo < HASH_ALGO__LAST) {
+ fmt = DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO;
+ offset += snprintf(buffer, DIGEST_TYPE_NAME_LEN_MAX +
+ CRYPTO_MAX_ALG_NAME + 1, "%*s:%s",
+ (int)strlen(digest_type_name[digest_type]),
+ digest_type_name[digest_type],
hash_algo_name[hash_algo]);
buffer[offset] = ':';
offset += 2;
+ } else if (hash_algo < HASH_ALGO__LAST) {
+ fmt = DATA_FMT_DIGEST_WITH_ALGO;
+ offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1,
+ "%s", hash_algo_name[hash_algo]);
+ buffer[offset] = ':';
+ offset += 2;
}
if (digest)
@@ -359,7 +392,8 @@ int ima_eventdigest_init(struct ima_event_data *event_data,
cur_digestsize = hash.hdr.length;
out:
return ima_eventdigest_init_common(cur_digest, cur_digestsize,
- HASH_ALGO__LAST, field_data);
+ DIGEST_TYPE__LAST, HASH_ALGO__LAST,
+ field_data);
}
/*
@@ -380,7 +414,32 @@ int ima_eventdigest_ng_init(struct ima_event_data *event_data,
hash_algo = event_data->iint->ima_hash->algo;
out:
return ima_eventdigest_init_common(cur_digest, cur_digestsize,
- hash_algo, field_data);
+ DIGEST_TYPE__LAST, hash_algo,
+ field_data);
+}
+
+/*
+ * This function writes the digest of an event (without size limit),
+ * prefixed with both the hash type and algorithm.
+ */
+int ima_eventdigest_ngv2_init(struct ima_event_data *event_data,
+ struct ima_field_data *field_data)
+{
+ u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
+ u32 cur_digestsize = 0;
+ u8 digest_type = DIGEST_TYPE_IMA;
+
+ if (event_data->violation) /* recording a violation. */
+ goto out;
+
+ cur_digest = event_data->iint->ima_hash->digest;
+ cur_digestsize = event_data->iint->ima_hash->length;
+
+ hash_algo = event_data->iint->ima_hash->algo;
+out:
+ return ima_eventdigest_init_common(cur_digest, cur_digestsize,
+ digest_type, hash_algo,
+ field_data);
}
/*
@@ -415,7 +474,8 @@ int ima_eventdigest_modsig_init(struct ima_event_data *event_data,
}
return ima_eventdigest_init_common(cur_digest, cur_digestsize,
- hash_algo, field_data);
+ DIGEST_TYPE__LAST, hash_algo,
+ field_data);
}
static int ima_eventname_init_common(struct ima_event_data *event_data,
diff --git a/security/integrity/ima/ima_template_lib.h b/security/integrity/ima/ima_template_lib.h
index c71f1de95753..9f7c335f304f 100644
--- a/security/integrity/ima/ima_template_lib.h
+++ b/security/integrity/ima/ima_template_lib.h
@@ -21,6 +21,8 @@ void ima_show_template_digest(struct seq_file *m, enum ima_show_type show,
struct ima_field_data *field_data);
void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show,
struct ima_field_data *field_data);
+void ima_show_template_digest_ngv2(struct seq_file *m, enum ima_show_type show,
+ struct ima_field_data *field_data);
void ima_show_template_string(struct seq_file *m, enum ima_show_type show,
struct ima_field_data *field_data);
void ima_show_template_sig(struct seq_file *m, enum ima_show_type show,
@@ -38,6 +40,8 @@ int ima_eventname_init(struct ima_event_data *event_data,
struct ima_field_data *field_data);
int ima_eventdigest_ng_init(struct ima_event_data *event_data,
struct ima_field_data *field_data);
+int ima_eventdigest_ngv2_init(struct ima_event_data *event_data,
+ struct ima_field_data *field_data);
int ima_eventdigest_modsig_init(struct ima_event_data *event_data,
struct ima_field_data *field_data);
int ima_eventname_ng_init(struct ima_event_data *event_data,
--
2.27.0
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