Re: [ANNOUNCE] Release Digsig 1.3.1: kernel module for run-time authentication of binaries
From: Makan Pourzandi
Date: Wed Sep 22 2004 - 10:41:09 EST
Hi all,
We integrated Chris's patch to our cvs source code base. There is a new
release 1.3.2 at our sourceforge site:
http://sourceforge.net/projects/disec/.
Best Regards,
Makan
Chris Wright wrote:
* Makan Pourzandi (QB/EMC) (makan.pourzandi@xxxxxxxxxxxx) wrote:
Thanks a lot for your feedback. We'll work on the modifications in
the source code mentioned in your email and send out a new release
hopefully soon.
Here's a patch with a bunch of cleanups:
(sorry it's one big patch, just kept growing...)
- white space and braces cleanups
- NULL pointer checks unified as (!ptr)
- fixup confusion on ERR_PTR vs. NULL (fixes Oopsen)
- cast on kmalloc is unecessary
- make anyting static that can be
- functions
- variables (and remove redundany 0 initialization for static vars)
- use static initializers for things like semaphores, lists, locks
- remove set_digsig_ops/security_set_operations in favor of
statically initiaized digsig_security_ops
- name change digsig_attribute_st -> digsig_attribute
- introduce DIGSIG_ATTR macro, and use for attribute initialization
- change names of sysfs files (in module, and hopefully supporting scripts
and programs)
- digsig_interface -> key
- digsig_revoke -> revoke
- move extern defs to header files
- get ifndef/define header bits correct
- move towards single point of return (goto and error cleanup)
- fixup memory leaks on error return paths
- move towards use of error values rather than just -1
- move ctx cleanup out of digsig_sign_verify_final so that caller is
responsible (less confusion and no chance of double free on error
cleanup)
- mark init functions as __init
- use security_initcall()
- remove unneeded digsig_init_revocation (list statically initialized now)
- remove inline on external functions
- use list_for_each_entry
- collapse 'n' and 'e' cases in digsig_key_store for raw_public_key allocation
- remove redundant file->f_security = NULL after digsig_allow_write_access()
- move list_add_tail() in dsi_sysfs for revoked key into digsig_revocation.c
under helper digsig_add_revoked_sig()
- add revoked_list_lock (used in above helper) for proper list manipulation
- s/SHA1_TFM/sha1_tfm/ ala CodingStyle
- fix bogus ctx==NULL check in digsig_sign_verify_update()
It compiles, and I actually loaded it and ran some tests to make sure
it still works. Seems OK. I didn't work at stressing any of the error
paths, but I think they are cleaner than they were.
thanks,
-chris
diff -paur digsig-1.3.1.orig/digsig.c digsig-1.3.1/digsig.c
--- digsig-1.3.1.orig/digsig.c 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/digsig.c 2004-09-11 11:11:31.000000000 -0700
@@ -60,18 +60,16 @@
#define get_file_security(file) ((unsigned long)(file->f_security))
#define set_file_security(file,val) (file->f_security = (void *)val)
-extern MPI digsig_public_key[2]; /* dsi_sig_verify.c */
-
unsigned long int total_jiffies = 0;
/* Allocate and free functions for each kind of security blob. */
-static struct semaphore digsig_sem;
+static DECLARE_MUTEX(digsig_sem);
/* Indicate if module as key or not */
int g_init = 0;
/* Keep track of how we are registered */
-int secondary = 0;
+static int secondary;
#ifdef DIGSIG_LOG
int DigsigDebugLevel = DEBUG_INIT | DEBUG_SIGN;
@@ -84,9 +82,6 @@ int digsig_max_cached_sigs = 512;
module_param(digsig_max_cached_sigs, int, 0);
MODULE_PARM_DESC(digsig_max_cached_sigs, "Number of signatures to keep cached\n");
-/* Number of signature validations cached so far */
-int digsig_num_cached_sigs = 0;
-
/******************************************************************************
Description :
* For a file being opened for write, check:
@@ -141,13 +136,6 @@ digsig_inode_unlink(struct inode *dir, s
return 0;
}
-struct security_operations digsig_security_ops;
-
-#define set_digsig_ops(ops, function) \
- if (!ops->function) { \
- ops->function = digsig_##function; \
- }
-
static int
digsig_verify_signature(Elf32_Shdr * elf_shdata,
char *sig_orig, struct file *file, int sh_offset);
@@ -195,7 +183,7 @@ static char *digsig_find_signature(struc
return NULL;
}
- buffer = (char *) kmalloc(DIGSIG_ELF_SIG_SIZE, DIGSIG_SAFE_ALLOC);
+ buffer = kmalloc(DIGSIG_ELF_SIG_SIZE, DIGSIG_SAFE_ALLOC);
if (!buffer) {
DSM_ERROR ("kmalloc failed in %s for buffer.\n", __FUNCTION__);
return NULL;
@@ -231,62 +219,50 @@ static int
digsig_verify_signature(Elf32_Shdr * elf_shdata,
char *sig_orig, struct file *file, int sh_offset)
{
- char *sig_result, *read_blocks;
- int retval, offset;
- unsigned int size;
+ char *sig_result = NULL, *read_blocks = NULL;
+ int retval = -EPERM, offset;
unsigned int lower, upper;
- SIGCTX *ctx;
+ loff_t i_size;
+ SIGCTX *ctx = NULL;
down (&digsig_sem);
if (digsig_is_revoked_sig(sig_orig)) {
DSM_ERROR("%s: Refusing attempt to load an ELF file with"
" a revoked signature.\n", __FUNCTION__);
- up (&digsig_sem);
- return -EPERM;
+ goto out;
}
- if ((ctx = digsig_sign_verify_init(HASH_SHA1, SIGN_RSA)) == NULL) {
+ retval = -ENOMEM;
+ ctx = digsig_sign_verify_init(HASH_SHA1, SIGN_RSA);
+ if (!ctx ) {
DSM_PRINT(DEBUG_SIGN,
"%s: Cannot allocate crypto context.\n", __FUNCTION__);
- up (&digsig_sem);
- return -ENOMEM;
+ goto out;
}
- sig_result = (char *) kmalloc(DIGSIG_ELF_SIG_SIZE, DIGSIG_SAFE_ALLOC);
+ sig_result = kmalloc(DIGSIG_ELF_SIG_SIZE, DIGSIG_SAFE_ALLOC);
if (!sig_result) {
DSM_ERROR ("kmalloc failed in %s for sig_result.\n", __FUNCTION__);
- kfree (ctx->tvmem);
- kfree (ctx);
- up (&digsig_sem);
- return -ENOMEM;
+ goto out;
}
- read_blocks = (char *) kmalloc(DIGSIG_ELF_READ_BLOCK_SIZE, DIGSIG_SAFE_ALLOC);
+ read_blocks = kmalloc(DIGSIG_ELF_READ_BLOCK_SIZE, DIGSIG_SAFE_ALLOC);
if (!read_blocks) {
DSM_ERROR ("kmalloc failed in %s for read_block.\n", __FUNCTION__);
- kfree (ctx->tvmem);
- kfree (ctx);
- kfree (sig_result);
- up (&digsig_sem);
- return -ENOMEM;
+ goto out;
}
memset(sig_result, 0, DIGSIG_ELF_SIG_SIZE);
- for (offset = 0; offset < file->f_dentry->d_inode->i_size;
- offset += DIGSIG_ELF_READ_BLOCK_SIZE) {
+ i_size = i_size_read(file->f_dentry->d_inode);
+ for (offset = 0; offset < i_size; offset += DIGSIG_ELF_READ_BLOCK_SIZE){
- size = kernel_read(file, offset, (char *) read_blocks,
+ retval = kernel_read(file, offset, (char *) read_blocks,
DIGSIG_ELF_READ_BLOCK_SIZE);
- if (size <= 0) {
+ if (retval <= 0) {
DSM_PRINT(DEBUG_SIGN,
"%s: Unable to read signature in blocks: %d\n",
- __FUNCTION__, size);
- kfree(sig_result);
- kfree(read_blocks);
- kfree(ctx->tvmem);
- kfree(ctx);
- up (&digsig_sem);
- return -1;
+ __FUNCTION__, retval);
+ goto out;
}
/* Makan: This is in order to avoid building a buffer
@@ -308,31 +284,32 @@ digsig_verify_signature(Elf32_Shdr * elf
}
/* continue verification loop */
- if (digsig_sign_verify_update(ctx, read_blocks, size) != 0) {
+ retval = digsig_sign_verify_update(ctx, read_blocks, retval);
+ if (retval < 0) {
DSM_PRINT(DEBUG_SIGN,
"%s: Error updating crypto verification\n", __FUNCTION__);
- kfree(sig_result);
- kfree(read_blocks);
- kfree(ctx->tvmem);
- kfree(ctx);
- up (&digsig_sem);
- return -1;
+ goto out;
}
}
/* A bit of bsign formatting else hashes won't match, works with bsign v0.4.4 */
- if ((retval = digsig_sign_verify_final(ctx, sig_result, DIGSIG_ELF_SIG_SIZE,
- sig_orig + DIGSIG_BSIGN_INFOS)) < 0) {
+ retval = digsig_sign_verify_final(ctx, sig_result, DIGSIG_ELF_SIG_SIZE,
+ sig_orig + DIGSIG_BSIGN_INFOS);
+ if (retval < 0) {
DSM_PRINT(DEBUG_SIGN,
"%s: Error calculating final crypto verification\n", __FUNCTION__);
- kfree(sig_result);
- kfree(read_blocks);
- up (&digsig_sem);
- return -1;
+ goto out;
}
+ retval = 0;
+
+out:
kfree(sig_result);
kfree(read_blocks);
+ if (ctx) {
+ kfree(ctx->tvmem);
+ kfree(ctx);
+ }
up (&digsig_sem);
return retval;
}
@@ -382,7 +359,7 @@ static void digsig_allow_write_access(st
* file->f_security>0, and we decrement the inode usage count to
* show that we are done with it.
*/
-void digsig_file_free_security(struct file *file)
+static void digsig_file_free_security(struct file *file)
{
if (file->f_security) {
digsig_allow_write_access(file);
@@ -426,18 +403,17 @@ static inline struct elfhdr *read_elf_he
{
struct elfhdr *elf_ex;
- elf_ex =
- (struct elfhdr *)kmalloc(sizeof(struct elfhdr), DIGSIG_SAFE_ALLOC);
+ elf_ex = kmalloc(sizeof(struct elfhdr), DIGSIG_SAFE_ALLOC);
if (!elf_ex) {
DSM_ERROR ("%s: kmalloc failed for elf_ex\n", __FUNCTION__);
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
kernel_read(file, 0, (char *)elf_ex, sizeof(struct elfhdr));
if (elf_sanity_check(elf_ex)) {
kfree(elf_ex);
- return NULL;
+ return ERR_PTR(-EINVAL);
}
return elf_ex;
@@ -449,7 +425,7 @@ read_section_header(struct file *file, i
Elf32_Shdr *elf_shdata;
int retval;
- elf_shdata = (Elf32_Shdr *) kmalloc(sh_size, DIGSIG_SAFE_ALLOC);
+ elf_shdata = kmalloc(sh_size, DIGSIG_SAFE_ALLOC);
if (!elf_shdata) {
DSM_ERROR("%s: Cannot allocate memory to read Section Header\n",
__FUNCTION__);
@@ -493,7 +469,7 @@ static inline int is_unprotected_file(st
__FUNCTION__, file->f_dentry->d_name.name, exec_time); \
}
-int digsig_file_mmap(struct file * file, unsigned long prot, unsigned long flags)
+static int digsig_file_mmap(struct file * file, unsigned long prot, unsigned long flags)
{
struct elfhdr *elf_ex;
int retval, sh_offset;
@@ -566,7 +542,7 @@ int digsig_file_mmap(struct file * file,
}
/* Verify binary's signature */
- retval = digsig_verify_signature (elf_shdata, sig_orig, file, sh_offset);
+ retval = digsig_verify_signature(elf_shdata, sig_orig, file, sh_offset);
if (!retval) {
DSM_PRINT(DEBUG_SIGN,
@@ -587,71 +563,67 @@ int digsig_file_mmap(struct file * file,
kfree (sig_orig);
out_free_shdata:
kfree (elf_shdata);
-
out_with_file:
kfree (elf_ex);
out_file_no_buf:
- if (allow_write_on_exit) {
+ if (allow_write_on_exit)
digsig_allow_write_access(file);
- file->f_security = NULL;
- }
end_digsig_bench;
return retval;
}
-void security_set_operations(struct security_operations *ops)
-{
- set_digsig_ops(ops, file_mmap);
- set_digsig_ops(ops, file_free_security);
- set_digsig_ops(ops, inode_permission);
- set_digsig_ops(ops, inode_unlink);
-}
+static struct security_operations digsig_security_ops = {
+ .file_mmap = digsig_file_mmap,
+ .file_free_security = digsig_file_free_security,
+ .inode_permission = digsig_inode_permission,
+ .inode_unlink = digsig_inode_unlink,
+};
static int __init digsig_init_module(void)
{
+ int ret = -ENOMEM;
DSM_PRINT(DEBUG_INIT, "Initializing module\n");
/* initialize caching mechanisms */
- if (digsig_init_caching()){
- return -ENOMEM;
- }
- digsig_init_revocation();
+ if (digsig_init_caching())
+ goto out;
- /* initialize DigSig's hooks */
- security_set_operations(&digsig_security_ops);
+ ret = -EINVAL;
+ if (digsig_init_sysfs()) {
+ DSM_ERROR("Error setting up sysfs for DigSig\n");
+ goto out_cache;
+ }
/* register */
- if (register_security (&digsig_security_ops)) {
- DSM_ERROR ("%s: Failure registering DigSig as primairy security module\n", __FUNCTION__);
- if (mod_reg_security ("digsig_verif", &digsig_security_ops)) {
- DSM_ERROR ("%s: Failure registering DigSig as secondary module\n", __FUNCTION__);
- return -EINVAL;
+ if (register_security(&digsig_security_ops)) {
+ DSM_ERROR("%s: Failure registering DigSig as primairy security module\n", __FUNCTION__);
+ if (mod_reg_security("digsig_verif", &digsig_security_ops)) {
+ DSM_ERROR("%s: Failure registering DigSig as secondary module\n", __FUNCTION__);
+ goto out_sysfs;
}
- DSM_PRINT (DEBUG_INIT, "Registered as secondary module\n");
+ DSM_PRINT(DEBUG_INIT, "Registered as secondary module\n");
secondary = 1;
}
-
- init_MUTEX (&digsig_sem);
-
- if (digsig_init_sysfs()) {
- DSM_ERROR("Error setting up sysfs for DigSig\n");
- return -EINVAL;
- }
-
return 0;
+out_sysfs:
+ digsig_cleanup_sysfs();
+out_cache:
+ digsig_cache_cleanup();
+out:
+ return ret;
}
static void __exit digsig_exit_module(void)
{
DSM_PRINT (DEBUG_INIT, "Deinitializing module\n");
g_init = 0;
- digsig_sign_verify_free ();
- digsig_cleanup_sysfs ();
- digsig_cleanup_revocation ();
- digsig_cache_cleanup ();
+ digsig_sign_verify_free();
+ digsig_cleanup_sysfs();
+ digsig_cleanup_revocation();
+ digsig_cache_cleanup();
mpi_free(digsig_public_key[0]);
mpi_free(digsig_public_key[1]);
if (secondary) {
@@ -666,7 +638,7 @@ static void __exit digsig_exit_module(vo
}
}
-module_init(digsig_init_module);
+security_initcall(digsig_init_module);
module_exit(digsig_exit_module);
/* see linux/module.h */
diff -paur digsig-1.3.1.orig/digsig_cache.c digsig-1.3.1/digsig_cache.c
--- digsig-1.3.1.orig/digsig_cache.c 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/digsig_cache.c 2004-09-11 09:11:01.000000000 -0700
@@ -33,10 +33,9 @@
#define DIGSIG_BENCH 0
#endif
-extern int DigsigDebugLevel;
-
-extern int digsig_max_cached_sigs, digsig_num_cached_sigs;
-extern int g_init;
+extern int digsig_max_cached_sigs;
+/* Number of signature validations cached so far */
+static int digsig_num_cached_sigs;
/*
* digsig_hash_table:
@@ -71,8 +70,8 @@ struct digsig_hash_table {
struct digsig_hash_table *prev; /* only set if dynamically alloced */
};
-static struct digsig_hash_table *sig_cache = NULL;
-static struct list_head sig_cache_lru;
+static struct digsig_hash_table *sig_cache;
+static LIST_HEAD(sig_cache_lru);
static spinlock_t sig_cache_spinlock = SPIN_LOCK_UNLOCKED;
/******************************************************************************
@@ -177,7 +176,7 @@ Description :
Parameters : @num: number of cached sig validation entries to clear.
Return value: number of entries actually deleted.
******************************************************************************/
-int digsig_purge_cache(int num)
+static int digsig_purge_cache(int num)
{
int i=0;
struct digsig_hash_table *tmph, *del;
@@ -313,7 +312,7 @@ Description : Initialize caching
Parameters : none
Return value: 0 on success, 1 on failure.
******************************************************************************/
-int digsig_init_caching(void)
+int __init digsig_init_caching(void)
{
int tmp;
@@ -321,7 +320,7 @@ int digsig_init_caching(void)
sizeof(struct digsig_hash_table), GFP_ATOMIC);
/* GFP_KERNEL); */
- if (IS_ERR(sig_cache)) {
+ if (!sig_cache) {
DSM_PRINT(DEBUG_ERROR, "No memory to initialize digsig cache.\n");
return 1;
}
@@ -333,10 +332,7 @@ int digsig_init_caching(void)
sig_cache[tmp].orig = 1;
}
- INIT_LIST_HEAD(&sig_cache_lru);
-
return 0;
-
}
/*
diff -paur digsig-1.3.1.orig/digsig_cache.h digsig-1.3.1/digsig_cache.h
--- digsig-1.3.1.orig/digsig_cache.h 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/digsig_cache.h 2004-09-11 10:53:49.000000000 -0700
@@ -15,16 +15,17 @@
*
*/
-#ifndef __DSI_CACHE_H
+#ifndef _DSI_CACHE_H
+#define _DSI_CACHE_H
#include <linux/fs.h>
#include "gnupg/mpi/mpi.h"
int is_cached_signature(struct inode *inode);
void remove_signature(struct inode *inode);
-int digsig_purge_cache(int num);
void digsig_cache_signature(struct inode *inode);
int digsig_init_caching(void);
void digsig_cache_cleanup(void);
-#endif
+#endif /* _DSI_CACHE_H */
+
diff -paur digsig-1.3.1.orig/digsig.init digsig-1.3.1/digsig.init
--- digsig-1.3.1.orig/digsig.init 2004-04-27 06:49:36.000000000 -0700
+++ digsig-1.3.1/digsig.init 2004-09-11 11:55:40.000000000 -0700
@@ -47,7 +47,7 @@ case "$1" in
echo "Catting revoked sigs into revocation list"
if [ -d $REVKEY_DIR ]; then
for name in `/bin/ls $REVKEY_DIR`; do
- /bin/cat $REVKEY_DIR/$name > /sys/digsig/digsig_revoke
+ /bin/cat $REVKEY_DIR/$name > /sys/digsig/revoke
done
fi
echo "Loading public key."
diff -paur digsig-1.3.1.orig/digsig_revocation.c digsig-1.3.1/digsig_revocation.c
--- digsig-1.3.1.orig/digsig_revocation.c 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/digsig_revocation.c 2004-09-11 12:09:25.558845224 -0700
@@ -34,10 +34,8 @@
#define DIGSIG_BENCH 0
#endif
-extern int DigsigDebugLevel;
-
-extern int digsig_max_hashed_sigs, digsig_num_hashed_sigs;
-struct list_head digsig_revoked_sigs;
+static LIST_HEAD(digsig_revoked_sigs);
+static spinlock_t revoked_list_lock = SPIN_LOCK_UNLOCKED;
/*
* Description: Called at module unload to free the list of revoked
@@ -48,6 +46,7 @@ void digsig_free_revoked_sigs(void)
struct list_head *tmp;
struct revoked_sig *rsig;
+ spin_lock(&revoked_list_lock);
while (!list_empty(&digsig_revoked_sigs)) {
tmp = digsig_revoked_sigs.next;
if (tmp != &digsig_revoked_sigs) {
@@ -57,9 +56,10 @@ void digsig_free_revoked_sigs(void)
kfree(rsig);
} else {
DSM_ERROR("major list screwyness\n");
- return;
+ break;
}
}
+ spin_unlock(&revoked_list_lock);
}
/*
@@ -70,33 +70,34 @@ void digsig_free_revoked_sigs(void)
#ifdef DIGSIG_REVOCATION
int digsig_is_revoked_sig(char *buffer)
{
- struct list_head *tmp;
struct revoked_sig *rsig;
char *tmp1 = buffer + DIGSIG_BSIGN_INFOS + DIGSIG_RSA_DATA_OFFSET;
int count = DIGSIG_ELF_SIG_SIZE - DIGSIG_BSIGN_INFOS - DIGSIG_RSA_DATA_OFFSET;
int ret = 0;
MPI file_sig = mpi_read_from_buffer(tmp1, &count, 0);
- list_for_each(tmp, &digsig_revoked_sigs) {
- rsig = list_entry(tmp, struct revoked_sig, next);
+ spin_lock(&revoked_list_lock);
+ list_for_each_entry(rsig, &digsig_revoked_sigs, next) {
if (mpi_cmp(file_sig, rsig->sig) == 0) {
ret = 1;
goto out;
}
}
-
out:
+ spin_unlock(&revoked_list_lock);
mpi_free(file_sig);
return ret;
}
#endif
-inline void digsig_init_revocation()
+void digsig_add_revoked_sig(struct revoked_sig *sig)
{
- INIT_LIST_HEAD(&digsig_revoked_sigs);
+ spin_lock(&revoked_list_lock);
+ list_add_tail(&sig->next, &digsig_revoked_sigs);
+ spin_unlock(&revoked_list_lock);
}
-inline void digsig_cleanup_revocation()
+void digsig_cleanup_revocation(void)
{
digsig_free_revoked_sigs();
}
diff -paur digsig-1.3.1.orig/digsig_revocation.h digsig-1.3.1/digsig_revocation.h
--- digsig-1.3.1.orig/digsig_revocation.h 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/digsig_revocation.h 2004-09-11 10:54:03.000000000 -0700
@@ -15,19 +15,12 @@
*
*/
-#ifndef __DSI_REVOKE_H
+#ifndef _DSI_REVOKE_H
+#define _DSI_REVOKE_H
#include <linux/fs.h>
#include "gnupg/mpi/mpi.h"
-void digsig_init_revocation(void);
-void digsig_cleanup_revocation(void);
-#ifdef DIGSIG_REVOCATION
-int digsig_is_revoked_sig(char *buffer);
-#else
-#define digsig_is_revoked_sig(x) 0
-#endif
-
/*
* A linear array of revoked signatures.
*
@@ -39,4 +32,14 @@ struct revoked_sig {
MPI sig;
};
+void digsig_init_revocation(void);
+void digsig_cleanup_revocation(void);
+void digsig_add_revoked_sig(struct revoked_sig *sig);
+#ifdef DIGSIG_REVOCATION
+int digsig_is_revoked_sig(char *buffer);
+#else
+#define digsig_is_revoked_sig(x) 0
#endif
+
+#endif /* _DSI_REVOKE_H */
+
diff -paur digsig-1.3.1.orig/dsi_debug.h digsig-1.3.1/dsi_debug.h
--- digsig-1.3.1.orig/dsi_debug.h 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/dsi_debug.h 2004-09-11 10:56:06.000000000 -0700
@@ -18,8 +18,8 @@
*/
-#ifndef __DSI_DEBUG_H
-#define __DSI_DEBUG_H
+#ifndef _DSI_DEBUG_H
+#define _DSI_DEBUG_H
#define DIGSIG_MODULE_NAME "DIGSIG MODULE"
@@ -63,4 +63,4 @@ extern int DigsigDebugLevel;
#define DSM_PRINT_NO_PREFIX(dbg,fmt,arg...) \
if (dbg & DigsigDebugLevel) printk(fmt,##arg)
-#endif /* __DSI_DEBUG_H */
+#endif /* _DSI_DEBUG_H */
diff -paur digsig-1.3.1.orig/dsi.h digsig-1.3.1/dsi.h
--- digsig-1.3.1.orig/dsi.h 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/dsi.h 2004-09-11 10:56:12.000000000 -0700
@@ -20,8 +20,8 @@
*/
-#ifndef __DSI_H
-#define __DSI_H
+#ifndef _DSI_H
+#define _DSI_H
#ifdef MODULE
#include <linux/kernel.h>
@@ -49,4 +49,6 @@
#endif /* MODULE */
-#endif
+extern int g_init;
+
+#endif /* _DSI_H */
diff -paur digsig-1.3.1.orig/dsi_sig_verify.c digsig-1.3.1/dsi_sig_verify.c
--- digsig-1.3.1.orig/dsi_sig_verify.c 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/dsi_sig_verify.c 2004-09-11 11:21:59.000000000 -0700
@@ -33,12 +33,10 @@
* n bytes: MPI (ie. 0x29)
*/
-extern int DigsigDebugLevel;
-
#define TVMEMSIZE 4096
int gDigestLength[] = { /* SHA-1 */ 0x14 };
-static struct crypto_tfm *SHA1_TFM = NULL;
+static struct crypto_tfm *sha1_tfm;
MPI digsig_public_key[] = {MPI_NULL, MPI_NULL};
@@ -70,17 +68,16 @@ SIGCTX *digsig_sign_verify_init(int hash
SIGCTX *ctx;
/* allocating signature context */
- ctx = (SIGCTX *) kmalloc(sizeof(SIGCTX), GFP_KERNEL);
- if (ctx == NULL) {
+ ctx = kmalloc(sizeof(SIGCTX), GFP_KERNEL);
+ if (!ctx) {
DSM_ERROR("Cannot allocate ctx\n");
- return NULL;
+ goto err;
}
ctx->tvmem = kmalloc(TVMEMSIZE, GFP_KERNEL);
- if (ctx->tvmem == NULL) {
- kfree(ctx);
+ if (!ctx->tvmem) {
DSM_ERROR("Cannot allocate plaintext buffer\n");
- return NULL;
+ goto err;
}
/* checking hash algorithm is known */
@@ -88,16 +85,12 @@ SIGCTX *digsig_sign_verify_init(int hash
case HASH_SHA1:
if (digsig_sha1_init(ctx)) {
DSM_ERROR("Initializing SHA1 failed\n");
- kfree(ctx->tvmem);
- kfree(ctx);
- return NULL;
+ goto err;
}
break;
default:
DSM_ERROR("Unknown hash algo\n");
- kfree(ctx->tvmem);
- kfree(ctx);
- return NULL;
+ goto err;
}
/* checking sign algo is known */
@@ -106,13 +99,18 @@ SIGCTX *digsig_sign_verify_init(int hash
break;
default:
DSM_ERROR("Unknown sign algo\n");
- kfree(ctx->tvmem);
- kfree(ctx);
- return NULL;
+ goto err;
}
ctx->digestAlgo = hashalgo;
ctx->signAlgo = signalgo;
return ctx;
+
+err:
+ if (ctx) {
+ kfree(ctx->tvmem);
+ kfree(ctx);
+ }
+ return NULL;
}
/******************************************************************************
@@ -125,17 +123,16 @@ Return value: 0 normally
******************************************************************************/
int digsig_sign_verify_update(SIGCTX * ctx, char *buf, int buflen)
{
+ if (ctx == NULL)
+ return -EINVAL;
+
switch (ctx->digestAlgo) {
case HASH_SHA1:
- if (ctx == NULL) {
- return -1;
- }
-
digsig_sha1_update(ctx, buf, buflen);
break;
default:
DSM_ERROR("%s: Unknown hash algo\n", __FUNCTION__);
- return -1;
+ return -EINVAL;
}
return 0;
@@ -151,30 +148,24 @@ digsig_sign_verify_final(SIGCTX * ctx, c
unsigned char *signed_hash)
{
char *digest;
- int rc = -1;
+ int rc = -ENOMEM;
digest = kmalloc (gDigestLength[ctx->digestAlgo], DIGSIG_SAFE_ALLOC);
if (!digest) {
DSM_ERROR ("kmalloc failed in %s for digest\n", __FUNCTION__);
- return -ENOMEM;
+ goto err;
}
/* TO DO: check the length of the signature: it should be equal to the length
of the modulus */
if ((rc = digsig_sha1_final(ctx, digest)) < 0) {
DSM_ERROR
("%s: Cannot finalize hash algorithm\n", __FUNCTION__);
- kfree(ctx->tvmem);
- kfree(ctx);
- kfree (digest);
- return rc;
+ goto err;
}
- if (siglen < gDigestLength[ctx->digestAlgo]) {
- kfree(ctx->tvmem);
- kfree(ctx);
- kfree (digest);
- return -2;
- }
+ rc = -EINVAL;
+ if (siglen < gDigestLength[ctx->digestAlgo])
+ goto err;
memcpy(sig, digest, gDigestLength[ctx->digestAlgo]);
switch (ctx->digestAlgo) {
@@ -190,8 +181,7 @@ digsig_sign_verify_final(SIGCTX * ctx, c
/* free everything */
/* do not free SHA1-TFM. For optimization, we choose always to use the same one */
- kfree(ctx->tvmem);
- kfree(ctx);
+err:
kfree (digest);
return rc;
}
@@ -203,11 +193,11 @@ Description :
Parameters :
Return value:
******************************************************************************/
-void digsig_sign_verify_free()
+void digsig_sign_verify_free(void)
{
- if (SHA1_TFM) {
- crypto_free_tfm(SHA1_TFM);
- SHA1_TFM = NULL;
+ if (sha1_tfm) {
+ crypto_free_tfm(sha1_tfm);
+ sha1_tfm = NULL;
}
/* this might cause unpredictable behavior if structures are refering to this,
their pointer might suddenly become NULL, might need a usage count associated */
@@ -252,7 +242,7 @@ Return value: 0 - RSA signature is valid
-1 - an error occured
******************************************************************************/
-int digsig_rsa_bsign_verify(unsigned char *hash_format, int length,
+static int digsig_rsa_bsign_verify(unsigned char *hash_format, int length,
unsigned char *signed_hash)
{
int rc = 0;
@@ -265,7 +255,7 @@ int digsig_rsa_bsign_verify(unsigned cha
SIGCTX *ctx = NULL;
unsigned char *new_sig;
- new_sig = kmalloc (gDigestLength[HASH_SHA1], DIGSIG_SAFE_ALLOC);
+ new_sig = kmalloc(gDigestLength[HASH_SHA1], DIGSIG_SAFE_ALLOC);
if (!new_sig) {
DSM_ERROR ("kmalloc failed in %s for new_sig\n", __FUNCTION__);
return -ENOMEM;
@@ -274,18 +264,20 @@ int digsig_rsa_bsign_verify(unsigned cha
/* Get MPI of signed data from .sig file/section */
nread = DIGSIG_ELF_SIG_SIZE;
- data = mpi_read_from_buffer(signed_hash + DIGSIG_RSA_DATA_OFFSET, &nread,
- 0);
- if (!data)
+ data = mpi_read_from_buffer(signed_hash + DIGSIG_RSA_DATA_OFFSET,
+ &nread, 0);
+ if (!data) {
+ kfree(new_sig);
return -EINVAL;
+ }
/* Get MPI for hash */
/* bsign modif - file hash - gpg modif */
/* bsign modif: add bsign greet at beginning */
/* gpg modif: add class and timestamp at end */
- ctx = (SIGCTX *) kmalloc(sizeof(SIGCTX), GFP_KERNEL);
- if (ctx == NULL) {
+ ctx = kmalloc(sizeof(SIGCTX), GFP_KERNEL);
+ if (!ctx) {
DSM_ERROR("Cannot allocate ctx\n");
mpi_free (data);
kfree (new_sig);
@@ -293,7 +285,7 @@ int digsig_rsa_bsign_verify(unsigned cha
}
ctx->tvmem = kmalloc(TVMEMSIZE, GFP_KERNEL);
- if (ctx->tvmem == NULL) {
+ if (!ctx->tvmem) {
kfree (ctx);
mpi_free(data);
kfree (new_sig);
@@ -356,9 +348,9 @@ static int digsig_sha1_init(SIGCTX * ctx
if (ctx == NULL)
return -1;
- if (SHA1_TFM == NULL)
- SHA1_TFM = crypto_alloc_tfm("sha1", 0);
- ctx->tfm = SHA1_TFM;
+ if (sha1_tfm == NULL)
+ sha1_tfm = crypto_alloc_tfm("sha1", 0);
+ ctx->tfm = sha1_tfm;
if (ctx->tfm == NULL) {
DSM_ERROR("tfm allocation failed\n");
return -1;
@@ -392,7 +384,7 @@ static void digsig_sha1_update(SIGCTX *
/******************************************************************************
Description : Portability layer function.
Parameters :
-Return value: 0 for successful allocation, -1 for failed
+Return value: 0 for successful allocation, -EINVAL for failed
******************************************************************************/
static int digsig_sha1_final(SIGCTX * ctx, char *digest)
@@ -401,7 +393,7 @@ static int digsig_sha1_final(SIGCTX * ct
of the modulus */
if (ctx == NULL)
- return -1;
+ return -EINVAL;
crypto_digest_final(ctx->tfm, digest);
return 0;
diff -paur digsig-1.3.1.orig/dsi_sig_verify.h digsig-1.3.1/dsi_sig_verify.h
--- digsig-1.3.1.orig/dsi_sig_verify.h 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/dsi_sig_verify.h 2004-09-11 10:52:10.000000000 -0700
@@ -14,8 +14,8 @@
* David Gordon
*/
-#ifndef _DSI_SIG_VERIFY_H_
-#define _DSI_SIG_VERIFY_H_
+#ifndef _DSI_SIG_VERIFY_H
+#define _DSI_SIG_VERIFY_H
#include <linux/crypto.h>
#include <asm/scatterlist.h>
@@ -79,6 +79,7 @@ typedef struct sig_ctx_st {
} SIGCTX;
extern int gDigestLength[1];
+extern MPI digsig_public_key[];
SIGCTX *digsig_sign_verify_init(int hashalgo, int signalgo);
int digsig_sign_verify_update(SIGCTX * ctx, char *buf, int buflen);
@@ -90,4 +91,4 @@ int digsig_init_pkey(const char read_par
-#endif
+#endif /* _DSI_SIG_VERIFY_H */
diff -paur digsig-1.3.1.orig/dsi_sysfs.c digsig-1.3.1/dsi_sysfs.c
--- digsig-1.3.1.orig/dsi_sysfs.c 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/dsi_sysfs.c 2004-09-11 11:55:15.000000000 -0700
@@ -47,31 +47,26 @@
#define DIGSIG_KEY_OFFSET 1
#endif
-extern int g_init; /* digsig.c */
extern long int total_jiffies; /* digsig.c */
-extern MPI digsig_public_key[2]; /* dsi_sig_verify.c */
-extern struct list_head digsig_revoked_sigs; /* dsi_cache.c */
-
-struct digsig_attribute_st {
+struct digsig_attribute {
struct attribute attr;
ssize_t (*show)(struct kobject *, struct attribute *attr, char *);
ssize_t (*store)(struct kobject *, struct attribute *attr, const char *, size_t);
};
-/* from digsig_cache.c */
-extern struct list_head digsig_revoked_sigs;
+#define DIGSIG_ATTR(_name, _mode, _show, _store) \
+struct digsig_attribute digsig_attr_##_name = __ATTR(_name,_mode,_show,_store)
/*
* These are the show/hide prototypes and attribute for the
- * /sys/digsig/digsig_interface file, which is used to tell digsig the
+ * /sys/digsig/key file, which is used to tell digsig the
* public key to use to verify ELF file signatures.
*/
static ssize_t digsig_key_show (struct kobject *obj, struct attribute *attr,
char *buff);
static ssize_t digsig_key_store (struct kobject *obj, struct attribute *attr,
const char *buff, size_t count);
-char digsig_file_name[] = "digsig_interface";
/*
* For the curious, notice what's going on: We create a structure which
* contains .attr . This .attr is what we pass into sysfs_create_file
@@ -82,39 +77,26 @@ char digsig_file_name[] = "digsig_interf
* subtracting that from the address we were sent, which is what container_of
* in digsig_store and digsig_show (just a few definitions below) do.
*/
-static struct digsig_attribute_st digsig_attribute = {
- .attr = {.name = digsig_file_name,
- .owner = THIS_MODULE,
- .mode = S_IRUSR | S_IWUSR},
- .show = digsig_key_show,
- .store = digsig_key_store
-};
+static DIGSIG_ATTR(key, 0600, digsig_key_show, digsig_key_store);
/*
* These are the show/hide prototypes and attribute for the
- * /sys/digsig/digsig_revoke file, which is used to tell digsig the
+ * /sys/digsig/revoke file, which is used to tell digsig the
* ELF file signatures which are revoked. Digsig will not allow
* loading any files which carry one of these signatures.
*/
-static ssize_t digsig_revoked_list_show (struct kobject *obj,
+static ssize_t digsig_revoked_show (struct kobject *obj,
struct attribute *attr, char *buff);
-static ssize_t digsig_revoked_list_store (struct kobject *obj,
+static ssize_t digsig_revoked_store (struct kobject *obj,
struct attribute *attr, const char *buff, size_t count);
-char digsig_r_file_name[] = "digsig_revoke";
-static struct digsig_attribute_st digsig_r_attribute = {
- .attr = {.name = digsig_r_file_name,
- .owner = THIS_MODULE,
- .mode = S_IRUSR | S_IWUSR},
- .show = digsig_revoked_list_show,
- .store = digsig_revoked_list_store
-};
+static DIGSIG_ATTR(revoke, 0600, digsig_revoked_show, digsig_revoked_store);
/*
* Next are the digsig sysfs file operations. These are assigned to
- * the files under /sys/digsig. They will use the digsig_attribute_st
+ * the files under /sys/digsig. They will use the digsig_attribute
* struct defined above to find the function which should actually be
* called for read/write. The attr argument to these functions is a
- * member of the digsig_attribute_st struct we defined, so we use its
+ * member of the digsig_attribute struct we defined, so we use its
* offset to find our structure, which in turn contains the read and
* write operations we actually want to perform.
*/
@@ -122,8 +104,8 @@ static ssize_t
digsig_store(struct kobject *kobj, struct attribute *attr, const char *buf,
size_t len)
{
- struct digsig_attribute_st *attribute = container_of(attr,
- struct digsig_attribute_st, attr);
+ struct digsig_attribute *attribute = container_of(attr,
+ struct digsig_attribute, attr);
return attribute->store ? attribute->store(kobj, attr, buf, len) : 0;
}
@@ -131,8 +113,8 @@ digsig_store(struct kobject *kobj, struc
static ssize_t
digsig_show(struct kobject *kobj, struct attribute *attr, char *buf)
{
- struct digsig_attribute_st *attribute = container_of(attr,
- struct digsig_attribute_st, attr);
+ struct digsig_attribute *attribute = container_of(attr,
+ struct digsig_attribute, attr);
return attribute->show ? attribute->show(kobj, attr, buf) : 0;
}
@@ -161,28 +143,34 @@ static struct kobject digsig_kobject = {
/*
* init and cleanup functions for the /sys/digsig directory.
*/
-int digsig_init_sysfs(void)
+int __init digsig_init_sysfs(void)
{
if (kobject_register (&digsig_kobject) != 0) {
DSM_ERROR ("Digsig key failed to register properly\n");
- return -1;
+ goto err;
}
- if (sysfs_create_file(&digsig_kobject, &digsig_attribute.attr) != 0) {
+ if (sysfs_create_file(&digsig_kobject, &digsig_attr_key.attr) != 0) {
DSM_ERROR ("Create file failed\n");
- return -1;
+ goto create_key;
}
- if (sysfs_create_file(&digsig_kobject, &digsig_r_attribute.attr) != 0) {
+ if (sysfs_create_file(&digsig_kobject, &digsig_attr_revoke.attr) != 0) {
DSM_ERROR ("Create revocation file failed\n");
- return -1;
+ goto create_revoke;
}
-
return 0;
+
+create_revoke:
+ sysfs_remove_file (&digsig_kobject, &digsig_attr_key.attr);
+create_key:
+ kobject_unregister (&digsig_kobject);
+err:
+ return -1;
}
void digsig_cleanup_sysfs(void)
{
- sysfs_remove_file (&digsig_kobject, &digsig_attribute.attr);
- sysfs_remove_file (&digsig_kobject, &digsig_r_attribute.attr);
+ sysfs_remove_file (&digsig_kobject, &digsig_attr_key.attr);
+ sysfs_remove_file (&digsig_kobject, &digsig_attr_revoke.attr);
kobject_unregister (&digsig_kobject);
}
@@ -219,28 +207,17 @@ digsig_key_store (struct kobject *obj, s
return -1;
switch (buff[0]) {
-
case 'n':
- raw_public_key =
- (unsigned char *) kmalloc(count - DIGSIG_KEY_OFFSET, DIGSIG_SAFE_ALLOC);
- if (!raw_public_key) {
- DSM_ERROR("kmalloc fail for n in %s\n", __FUNCTION__);
- return -ENOMEM;
- }
- memcpy(raw_public_key, &buff[DIGSIG_KEY_OFFSET], count - DIGSIG_KEY_OFFSET);
- mpi_size = count - DIGSIG_KEY_OFFSET;
- DSM_PRINT(DEBUG_DEV, "pkey->n size is %i\n", mpi_size);
- break;
case 'e':
raw_public_key =
- (unsigned char *) kmalloc(count - DIGSIG_KEY_OFFSET, DIGSIG_SAFE_ALLOC);
+ kmalloc(count - DIGSIG_KEY_OFFSET, DIGSIG_SAFE_ALLOC);
if (!raw_public_key) {
- DSM_ERROR("kmalloc fail for e in %s\n", __FUNCTION__);
+ DSM_ERROR("kmalloc fail for %c in %s\n", buff[0], __FUNCTION__);
return -ENOMEM;
}
memcpy(raw_public_key, &buff[DIGSIG_KEY_OFFSET], count - DIGSIG_KEY_OFFSET);
mpi_size = count - DIGSIG_KEY_OFFSET;
- DSM_PRINT(DEBUG_DEV, "pkey->e size is %i\n", mpi_size);
+ DSM_PRINT(DEBUG_DEV, "pkey->%c size is %i\n", buff[0], mpi_size);
break;
default:
return -EINVAL;
@@ -265,12 +242,12 @@ digsig_key_show (struct kobject *obj, st
}
/*
- * callbacks for read/write to /sys/digsig/digsig_revoke file
+ * callbacks for read/write to /sys/digsig/revoke file
*/
static ssize_t
-digsig_revoked_list_store (struct kobject *obj, struct attribute *attr, const char *buff, size_t count)
+digsig_revoked_store (struct kobject *obj, struct attribute *attr, const char *buff, size_t count)
{
- struct revoked_sig *tmp;
+ struct revoked_sig *sig;
int rcount = DIGSIG_ELF_SIG_SIZE - DIGSIG_BSIGN_INFOS - DIGSIG_RSA_DATA_OFFSET;
if (g_init)
@@ -282,22 +259,22 @@ digsig_revoked_list_store (struct kobjec
return -EINVAL;
}
- tmp = kmalloc(sizeof(struct revoked_sig), GFP_KERNEL);
- if (!tmp)
+ sig = kmalloc(sizeof(struct revoked_sig), GFP_KERNEL);
+ if (!sig)
return -ENOMEM;
- memset(tmp, 0, sizeof(struct revoked_sig));
- tmp->sig = mpi_read_from_buffer(
+ memset(sig, 0, sizeof(struct revoked_sig));
+ sig->sig = mpi_read_from_buffer(
buff + DIGSIG_BSIGN_INFOS + DIGSIG_RSA_DATA_OFFSET,
&rcount, 0);
- list_add_tail(&tmp->next, &digsig_revoked_sigs);
+ digsig_add_revoked_sig(sig);
DSM_PRINT(DEBUG_SIGN, "Added a revoked sig.\n");
return count;
}
static ssize_t
-digsig_revoked_list_show (struct kobject *obj, struct attribute *attr, char *buff)
+digsig_revoked_show (struct kobject *obj, struct attribute *attr, char *buff)
{
return 0;
diff -paur digsig-1.3.1.orig/dsi_sysfs.h digsig-1.3.1/dsi_sysfs.h
--- digsig-1.3.1.orig/dsi_sysfs.h 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/dsi_sysfs.h 2004-09-11 10:55:08.000000000 -0700
@@ -14,8 +14,8 @@
*
* Vincent Roy
*/
-#ifndef __DSI_SYSFS_H
-#define __DSI_SYSFS_H
+#ifndef _DSI_SYSFS_H
+#define _DSI_SYSFS_H
ssize_t digsig_store (struct kobject *obj, struct attribute *attr, const char *buff, size_t count);
ssize_t digsig_show (struct kobject *obj, struct attribute *attr, char *buff);
@@ -26,4 +26,4 @@ ssize_t digsig_rev_list_show (struct kob
int digsig_init_sysfs(void);
void digsig_cleanup_sysfs(void);
-#endif
+#endif /* _DSI_SYSFS_H */
diff -paur digsig-1.3.1.orig/tools/extract_pkey.c digsig-1.3.1/tools/extract_pkey.c
--- digsig-1.3.1.orig/tools/extract_pkey.c 2004-09-03 05:31:19.000000000 -0700
+++ digsig-1.3.1/tools/extract_pkey.c 2004-09-11 11:53:37.000000000 -0700
@@ -53,7 +53,7 @@ int main(int argc, char **argv)
printf ("Unable to open pkey_file %s %s\n", argv[1], strerror(errno));
return -1;
}
- module_file = open ("/sys/digsig/digsig_interface", O_WRONLY);
+ module_file = open ("/sys/digsig/key", O_WRONLY);
if (!module_file) {
printf ("Unable to open module char device %s\n", strerror(errno));
return -1;
--
Makan Pourzandi, Open Systems Lab
Ericsson Research, Montreal, Canada
*This email does not represent or express the opinions of Ericsson Inc.*
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/