4d7aeee73f
This patch adds support for the new template 'ima-ng', whose format is defined as 'd-ng|n-ng'. These new field definitions remove the size limitations of the original 'ima' template. Further, the 'd-ng' field prefixes the inode digest with the hash algorithim, when displaying the new larger digest sizes. Change log: - scripts/Lindent fixes - Mimi - "always true comparison" - reported by Fengguang Wu, resolved Dmitry - initialize hash_algo variable to HASH_ALGO__LAST - always prefix digest with hash algorithm - Mimi Signed-off-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/*
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* Copyright (C) 2013 Politecnico di Torino, Italy
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* TORSEC group -- http://security.polito.it
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*
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* Author: Roberto Sassu <roberto.sassu@polito.it>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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* File: ima_template.c
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* Helpers to manage template descriptors.
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*/
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#include "ima.h"
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#include "ima_template_lib.h"
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static struct ima_template_desc defined_templates[] = {
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{.name = IMA_TEMPLATE_IMA_NAME, .fmt = IMA_TEMPLATE_IMA_FMT},
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{.name = "ima-ng",.fmt = "d-ng|n-ng"},
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};
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static struct ima_template_field supported_fields[] = {
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{.field_id = "d",.field_init = ima_eventdigest_init,
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.field_show = ima_show_template_digest},
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{.field_id = "n",.field_init = ima_eventname_init,
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.field_show = ima_show_template_string},
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{.field_id = "d-ng",.field_init = ima_eventdigest_ng_init,
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.field_show = ima_show_template_digest_ng},
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{.field_id = "n-ng",.field_init = ima_eventname_ng_init,
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.field_show = ima_show_template_string},
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};
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static struct ima_template_field *lookup_template_field(const char *field_id)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(supported_fields); i++)
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if (strncmp(supported_fields[i].field_id, field_id,
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IMA_TEMPLATE_FIELD_ID_MAX_LEN) == 0)
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return &supported_fields[i];
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return NULL;
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}
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static int template_fmt_size(char *template_fmt)
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{
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char c;
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int template_fmt_len = strlen(template_fmt);
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int i = 0, j = 0;
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while (i < template_fmt_len) {
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c = template_fmt[i];
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if (c == '|')
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j++;
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i++;
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}
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return j + 1;
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}
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static int template_desc_init_fields(char *template_fmt,
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struct ima_template_field ***fields,
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int *num_fields)
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{
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char *c, *template_fmt_ptr = template_fmt;
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int template_num_fields = template_fmt_size(template_fmt);
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int i, result = 0;
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if (template_num_fields > IMA_TEMPLATE_NUM_FIELDS_MAX)
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return -EINVAL;
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*fields = kzalloc(template_num_fields * sizeof(*fields), GFP_KERNEL);
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if (*fields == NULL) {
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result = -ENOMEM;
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goto out;
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}
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for (i = 0; (c = strsep(&template_fmt_ptr, "|")) != NULL &&
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i < template_num_fields; i++) {
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struct ima_template_field *f = lookup_template_field(c);
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if (!f) {
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result = -ENOENT;
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goto out;
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}
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(*fields)[i] = f;
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}
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*num_fields = i;
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return 0;
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out:
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kfree(*fields);
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*fields = NULL;
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return result;
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}
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static int init_defined_templates(void)
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{
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int i = 0;
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int result = 0;
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/* Init defined templates. */
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for (i = 0; i < ARRAY_SIZE(defined_templates); i++) {
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struct ima_template_desc *template = &defined_templates[i];
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result = template_desc_init_fields(template->fmt,
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&(template->fields),
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&(template->num_fields));
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if (result < 0)
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return result;
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}
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return result;
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}
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int ima_init_template(void)
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{
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int result;
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result = init_defined_templates();
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if (result < 0)
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return result;
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return 0;
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}
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