diff options
Diffstat (limited to 'security/integrity/ima')
| -rw-r--r-- | security/integrity/ima/Makefile | 2 | ||||
| -rw-r--r-- | security/integrity/ima/ima.h | 5 | ||||
| -rw-r--r-- | security/integrity/ima/ima_fs.c | 296 | ||||
| -rw-r--r-- | security/integrity/ima/ima_init.c | 8 | ||||
| -rw-r--r-- | security/integrity/ima/ima_main.c | 5 |
5 files changed, 314 insertions, 2 deletions
diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile index 9d6bf973b9be..787c4cb916cd 100644 --- a/security/integrity/ima/Makefile +++ b/security/integrity/ima/Makefile @@ -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 diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index bfa72ed41b9b..9c280cc73004 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -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. diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c new file mode 100644 index 000000000000..4f25be768b50 --- /dev/null +++ b/security/integrity/ima/ima_fs.c @@ -0,0 +1,296 @@ +/* + * 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); +} diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index e0f02e328d77..cf227dbfac2c 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -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(); } diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 53cee4c512ce..871e356e8d6c 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -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"); |