integrity: IMA display (bab73937) · Commits · e / devices / android_kernel_fairphone_FP5

security/integrity/ima/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -5,5 +5,5 @@

		obj-$(CONFIG_IMA) += ima.o

		ima-y := ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
		ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
		ima_policy.o ima_iint.o ima_audit.o

security/integrity/ima/ima.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -67,6 +67,9 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
		/* Internal IMA function definitions */
		void ima_iintcache_init(void);
		int ima_init(void);
		void ima_cleanup(void);
		int ima_fs_init(void);
		void ima_fs_cleanup(void);
		int ima_add_template_entry(struct ima_template_entry *entry, int violation,
		const char op, struct inode inode);
		int ima_calc_hash(struct file file, char digest);
		@@ -115,6 +118,8 @@ void ima_store_measurement(struct ima_iint_cache iint, struct file file,
		const unsigned char *filename);
		int ima_store_template(struct ima_template_entry *entry, int violation,
		struct inode *inode);
		void ima_template_show(struct seq_file m, void e,
		enum ima_show_type show);

		/* radix tree calls to lookup, insert, delete
		* integrity data associated with an inode.

security/integrity/ima/ima_fs.c

0 → 100644

+296 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2005,2006,2007,2008 IBM Corporation
		*
		* Authors:
		* Kylene Hall <kjhall@us.ibm.com>
		* Reiner Sailer <sailer@us.ibm.com>
		* Mimi Zohar <zohar@us.ibm.com>
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License as
		* published by the Free Software Foundation, version 2 of the
		* License.
		*
		* File: ima_fs.c
		* implemenents security file system for reporting
		* current measurement list and IMA statistics
		*/
		#include <linux/module.h>
		#include <linux/seq_file.h>
		#include <linux/rculist.h>
		#include <linux/rcupdate.h>

		#include "ima.h"

		#define TMPBUFLEN 12
		static ssize_t ima_show_htable_value(char __user *buf, size_t count,
		loff_t ppos, atomic_long_t val)
		{
		char tmpbuf[TMPBUFLEN];
		ssize_t len;

		len = scnprintf(tmpbuf, TMPBUFLEN, "%li\n", atomic_long_read(val));
		return simple_read_from_buffer(buf, count, ppos, tmpbuf, len);
		}

		static ssize_t ima_show_htable_violations(struct file *filp,
		char __user *buf,
		size_t count, loff_t *ppos)
		{
		return ima_show_htable_value(buf, count, ppos, &ima_htable.violations);
		}

		static struct file_operations ima_htable_violations_ops = {
		.read = ima_show_htable_violations
		};

		static ssize_t ima_show_measurements_count(struct file *filp,
		char __user *buf,
		size_t count, loff_t *ppos)
		{
		return ima_show_htable_value(buf, count, ppos, &ima_htable.len);

		}

		static struct file_operations ima_measurements_count_ops = {
		.read = ima_show_measurements_count
		};

		/* returns pointer to hlist_node */
		static void ima_measurements_start(struct seq_file m, loff_t *pos)
		{
		loff_t l = *pos;
		struct ima_queue_entry *qe;

		/* we need a lock since pos could point beyond last element */
		rcu_read_lock();
		list_for_each_entry_rcu(qe, &ima_measurements, later) {
		if (!l--) {
		rcu_read_unlock();
		return qe;
		}
		}
		rcu_read_unlock();
		return NULL;
		}

		static void ima_measurements_next(struct seq_file m, void v, loff_t pos)
		{
		struct ima_queue_entry *qe = v;

		/* lock protects when reading beyond last element
		* against concurrent list-extension
		*/
		rcu_read_lock();
		qe = list_entry(rcu_dereference(qe->later.next),
		struct ima_queue_entry, later);
		rcu_read_unlock();
		(*pos)++;

		return (&qe->later == &ima_measurements) ? NULL : qe;
		}

		static void ima_measurements_stop(struct seq_file m, void v)
		{
		}

		static void ima_putc(struct seq_file m, void data, int datalen)
		{
		while (datalen--)
		seq_putc(m, (char )data++);
		}

		/* print format:
		* 32bit-le=pcr#
		* char[20]=template digest
		* 32bit-le=template name size
		* char[n]=template name
		* eventdata[n]=template specific data
		*/
		static int ima_measurements_show(struct seq_file m, void v)
		{
		/* the list never shrinks, so we don't need a lock here */
		struct ima_queue_entry *qe = v;
		struct ima_template_entry *e;
		int namelen;
		u32 pcr = CONFIG_IMA_MEASURE_PCR_IDX;

		/* get entry */
		e = qe->entry;
		if (e == NULL)
		return -1;

		/*
		* 1st: PCRIndex
		* PCR used is always the same (config option) in
		* little-endian format
		*/
		ima_putc(m, &pcr, sizeof pcr);

		/* 2nd: template digest */
		ima_putc(m, e->digest, IMA_DIGEST_SIZE);

		/* 3rd: template name size */
		namelen = strlen(e->template_name);
		ima_putc(m, &namelen, sizeof namelen);

		/* 4th: template name */
		ima_putc(m, e->template_name, namelen);

		/* 5th: template specific data */
		ima_template_show(m, (struct ima_template_data *)&e->template,
		IMA_SHOW_BINARY);
		return 0;
		}

		static struct seq_operations ima_measurments_seqops = {
		.start = ima_measurements_start,
		.next = ima_measurements_next,
		.stop = ima_measurements_stop,
		.show = ima_measurements_show
		};

		static int ima_measurements_open(struct inode inode, struct file file)
		{
		return seq_open(file, &ima_measurments_seqops);
		}

		static struct file_operations ima_measurements_ops = {
		.open = ima_measurements_open,
		.read = seq_read,
		.llseek = seq_lseek,
		.release = seq_release,
		};

		static void ima_print_digest(struct seq_file m, u8 digest)
		{
		int i;

		for (i = 0; i < IMA_DIGEST_SIZE; i++)
		seq_printf(m, "%02x", *(digest + i));
		}

		void ima_template_show(struct seq_file m, void e, enum ima_show_type show)
		{
		struct ima_template_data *entry = e;
		int namelen;

		switch (show) {
		case IMA_SHOW_ASCII:
		ima_print_digest(m, entry->digest);
		seq_printf(m, " %s\n", entry->file_name);
		break;
		case IMA_SHOW_BINARY:
		ima_putc(m, entry->digest, IMA_DIGEST_SIZE);

		namelen = strlen(entry->file_name);
		ima_putc(m, &namelen, sizeof namelen);
		ima_putc(m, entry->file_name, namelen);
		default:
		break;
		}
		}

		/* print in ascii */
		static int ima_ascii_measurements_show(struct seq_file m, void v)
		{
		/* the list never shrinks, so we don't need a lock here */
		struct ima_queue_entry *qe = v;
		struct ima_template_entry *e;

		/* get entry */
		e = qe->entry;
		if (e == NULL)
		return -1;

		/* 1st: PCR used (config option) */
		seq_printf(m, "%2d ", CONFIG_IMA_MEASURE_PCR_IDX);

		/* 2nd: SHA1 template hash */
		ima_print_digest(m, e->digest);

		/* 3th: template name */
		seq_printf(m, " %s ", e->template_name);

		/* 4th: template specific data */
		ima_template_show(m, (struct ima_template_data *)&e->template,
		IMA_SHOW_ASCII);
		return 0;
		}

		static struct seq_operations ima_ascii_measurements_seqops = {
		.start = ima_measurements_start,
		.next = ima_measurements_next,
		.stop = ima_measurements_stop,
		.show = ima_ascii_measurements_show
		};

		static int ima_ascii_measurements_open(struct inode inode, struct file file)
		{
		return seq_open(file, &ima_ascii_measurements_seqops);
		}

		static struct file_operations ima_ascii_measurements_ops = {
		.open = ima_ascii_measurements_open,
		.read = seq_read,
		.llseek = seq_lseek,
		.release = seq_release,
		};

		static struct dentry *ima_dir;
		static struct dentry *binary_runtime_measurements;
		static struct dentry *ascii_runtime_measurements;
		static struct dentry *runtime_measurements_count;
		static struct dentry *violations;

		int ima_fs_init(void)
		{
		ima_dir = securityfs_create_dir("ima", NULL);
		if (IS_ERR(ima_dir))
		return -1;

		binary_runtime_measurements =
		securityfs_create_file("binary_runtime_measurements",
		S_IRUSR \| S_IRGRP, ima_dir, NULL,
		&ima_measurements_ops);
		if (IS_ERR(binary_runtime_measurements))
		goto out;

		ascii_runtime_measurements =
		securityfs_create_file("ascii_runtime_measurements",
		S_IRUSR \| S_IRGRP, ima_dir, NULL,
		&ima_ascii_measurements_ops);
		if (IS_ERR(ascii_runtime_measurements))
		goto out;

		runtime_measurements_count =
		securityfs_create_file("runtime_measurements_count",
		S_IRUSR \| S_IRGRP, ima_dir, NULL,
		&ima_measurements_count_ops);
		if (IS_ERR(runtime_measurements_count))
		goto out;

		violations =
		securityfs_create_file("violations", S_IRUSR \| S_IRGRP,
		ima_dir, NULL, &ima_htable_violations_ops);
		if (IS_ERR(violations))
		goto out;

		return 0;

		out:
		securityfs_remove(runtime_measurements_count);
		securityfs_remove(ascii_runtime_measurements);
		securityfs_remove(binary_runtime_measurements);
		securityfs_remove(ima_dir);
		return -1;
		}

		void __exit ima_fs_cleanup(void)
		{
		securityfs_remove(violations);
		securityfs_remove(runtime_measurements_count);
		securityfs_remove(ascii_runtime_measurements);
		securityfs_remove(binary_runtime_measurements);
		securityfs_remove(ima_dir);
		}

security/integrity/ima/ima_init.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -86,5 +86,11 @@ int ima_init(void)

		ima_add_boot_aggregate(); /* boot aggregate must be first entry */
		ima_init_policy();
		return 0;

		return ima_fs_init();
		}

		void __exit ima_cleanup(void)
		{
		ima_fs_cleanup();
		}

security/integrity/ima/ima_main.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -274,6 +274,11 @@ static int __init init_ima(void)
		return error;
		}

		static void __exit cleanup_ima(void)
		{
		ima_cleanup();
		}

		late_initcall(init_ima); /* Start IMA after the TPM is available */

		MODULE_DESCRIPTION("Integrity Measurement Architecture");