提交 c2b095cc 编写于 作者: K Krzysztof Struczynski 提交者: Zheng Zengkai

ima: Add ima namespace to the ima subsystem APIs

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I49KW1
CVE: NA

--------------------------------

Add ima namespace pointer to the input parameters of the relevant
functions. This is a preparation for the policy namespacing, more
functions may be modified later, when other aspects of the ima are
namespaced.
Signed-off-by: NKrzysztof Struczynski <krzysztof.struczynski@huawei.com>
Reviewed-by: NZhang Tianxing <zhangtianxing3@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
上级 dcc22cdd
......@@ -152,7 +152,7 @@ static inline void ima_post_key_create_or_update(struct key *keyring,
#endif /* CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS */
#ifdef CONFIG_IMA_APPRAISE
extern bool is_ima_appraise_enabled(void);
extern bool is_ima_appraise_enabled(const struct ima_namespace *ima_ns);
extern void ima_inode_post_setattr(struct dentry *dentry);
extern int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
const void *xattr_value, size_t xattr_value_len);
......@@ -164,7 +164,7 @@ extern int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name);
extern void ima_inode_post_removexattr(struct dentry *dentry,
const char *xattr_name);
#else
static inline bool is_ima_appraise_enabled(void)
static inline bool is_ima_appraise_enabled(const struct ima_namespace *ima_ns)
{
return 0;
}
......
......@@ -268,7 +268,8 @@ static inline void ima_process_queued_keys(void) {}
int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
int mask, enum ima_hooks func, int *pcr,
struct ima_template_desc **template_desc,
const char *keyring);
const char *keyring,
struct ima_namespace *ima_ns);
int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
int ima_collect_measurement(struct integrity_iint_cache *iint,
struct file *file, void *buf, loff_t size,
......@@ -278,10 +279,12 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
struct evm_ima_xattr_data *xattr_value,
int xattr_len, const struct modsig *modsig, int pcr,
struct ima_template_desc *template_desc,
struct ima_digest *digest);
struct ima_digest *digest,
struct ima_namespace *ima_ns);
void process_buffer_measurement(struct inode *inode, const void *buf, int size,
const char *eventname, enum ima_hooks func,
int pcr, const char *keyring);
int pcr, const char *keyring,
struct ima_namespace *ima_ns);
void ima_audit_measurement(struct integrity_iint_cache *iint,
const unsigned char *filename);
int ima_alloc_init_template(struct ima_event_data *event_data,
......@@ -297,15 +300,16 @@ const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
enum ima_hooks func, int mask, int flags, int *pcr,
struct ima_template_desc **template_desc,
const char *keyring);
const char *keyring,
struct ima_namespace *ima_ns);
void ima_init_policy(void);
void ima_init_ns_policy(struct ima_namespace *ima_ns,
const struct ima_policy_setup_data *policy_setup_data);
void ima_update_policy(void);
void ima_update_policy_flag(void);
void ima_update_policy_flag(struct ima_namespace *ima_ns);
ssize_t ima_parse_add_rule(char *);
void ima_delete_rules(void);
int ima_check_policy(void);
int ima_check_policy(const struct ima_namespace *ima_ns);
void *ima_policy_start(struct seq_file *m, loff_t *pos);
void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
void ima_policy_stop(struct seq_file *m, void *v);
......@@ -333,20 +337,23 @@ int ima_default_appraise_setup(const char *str,
#ifdef CONFIG_IMA_APPRAISE
int ima_check_blacklist(struct integrity_iint_cache *iint,
const struct modsig *modsig, int pcr);
const struct modsig *modsig, int pcr,
struct ima_namespace *ima_ns);
int ima_appraise_measurement(enum ima_hooks func,
struct integrity_iint_cache *iint,
struct file *file, const unsigned char *filename,
struct evm_ima_xattr_data *xattr_value,
int xattr_len, const struct modsig *modsig,
struct ima_digest *found_digest);
int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func);
int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func,
struct ima_namespace *ima_ns);
void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
enum ima_hooks func);
#else
static inline int ima_check_blacklist(struct integrity_iint_cache *iint,
const struct modsig *modsig, int pcr)
const struct modsig *modsig, int pcr,
struct ima_namespace *ima_ns)
{
return 0;
}
......@@ -364,7 +371,8 @@ static inline int ima_appraise_measurement(enum ima_hooks func,
}
static inline int ima_must_appraise(struct inode *inode, int mask,
enum ima_hooks func)
enum ima_hooks func,
struct ima_namespace *ima_ns)
{
return 0;
}
......
......@@ -191,6 +191,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
* @pcr: pointer filled in if matched measure policy sets pcr=
* @template_desc: pointer filled in if matched measure policy sets template=
* @keyring: keyring name used to determine the action
* @ima_ns: ima namespace whose policy data will be used
*
* The policy is defined in terms of keypairs:
* subj=, obj=, type=, func=, mask=, fsmagic=
......@@ -206,14 +207,15 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
int mask, enum ima_hooks func, int *pcr,
struct ima_template_desc **template_desc,
const char *keyring)
const char *keyring,
struct ima_namespace *ima_ns)
{
int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE | IMA_HASH;
flags &= ima_policy_flag;
return ima_match_policy(inode, cred, secid, func, mask, flags, pcr,
template_desc, keyring);
template_desc, keyring, ima_ns);
}
/*
......@@ -318,7 +320,8 @@ void ima_store_measurement(struct integrity_iint_cache *iint,
struct evm_ima_xattr_data *xattr_value,
int xattr_len, const struct modsig *modsig, int pcr,
struct ima_template_desc *template_desc,
struct ima_digest *digest)
struct ima_digest *digest,
struct ima_namespace *ima_ns)
{
static const char op[] = "add_template_measure";
static const char audit_cause[] = "ENOMEM";
......
......@@ -81,10 +81,11 @@ __setup("ima_appraise_digest_list=", appraise_digest_list_setup);
/*
* is_ima_appraise_enabled - return appraise status
* @ima_ns: pointer to the ima namespace being checked
*
* Only return enabled, if not in ima_appraise="fix" or "log" modes.
*/
bool is_ima_appraise_enabled(void)
bool is_ima_appraise_enabled(const struct ima_namespace *ima_ns)
{
return ima_appraise & IMA_APPRAISE_ENFORCE;
}
......@@ -94,7 +95,8 @@ bool is_ima_appraise_enabled(void)
*
* Return 1 to appraise or hash
*/
int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func)
int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func,
struct ima_namespace *ima_ns)
{
u32 secid;
......@@ -103,7 +105,8 @@ int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func)
security_task_getsecid(current, &secid);
return ima_match_policy(inode, current_cred(), secid, func, mask,
IMA_APPRAISE | IMA_HASH, NULL, NULL, NULL);
IMA_APPRAISE | IMA_HASH, NULL, NULL, NULL,
NULL);
}
static int ima_fix_xattr(struct dentry *dentry,
......@@ -331,7 +334,8 @@ static int modsig_verify(enum ima_hooks func, const struct modsig *modsig,
* Returns -EPERM if the hash is blacklisted.
*/
int ima_check_blacklist(struct integrity_iint_cache *iint,
const struct modsig *modsig, int pcr)
const struct modsig *modsig, int pcr,
struct ima_namespace *ima_ns)
{
enum hash_algo hash_algo;
const u8 *digest = NULL;
......@@ -348,7 +352,7 @@ int ima_check_blacklist(struct integrity_iint_cache *iint,
if ((rc == -EPERM) && (iint->flags & IMA_MEASURE))
process_buffer_measurement(NULL, digest, digestsize,
"blacklisted-hash", NONE,
pcr, NULL);
pcr, NULL, NULL);
}
return rc;
......@@ -575,7 +579,7 @@ void ima_inode_post_setattr(struct dentry *dentry)
|| !(inode->i_opflags & IOP_XATTR))
return;
action = ima_must_appraise(inode, MAY_ACCESS, POST_SETATTR);
action = ima_must_appraise(inode, MAY_ACCESS, POST_SETATTR, NULL);
iint = integrity_iint_find(inode);
if (iint) {
set_bit(IMA_CHANGE_ATTR, &iint->atomic_flags);
......
......@@ -60,5 +60,6 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key,
*/
process_buffer_measurement(NULL, payload, payload_len,
keyring->description, KEY_CHECK, 0,
keyring->description);
keyring->description,
NULL);
}
......@@ -527,7 +527,7 @@ static int ima_release_data_upload(struct inode *inode, struct file *file)
return 0;
}
if (valid_policy && ima_check_policy() < 0) {
if (valid_policy && ima_check_policy(NULL) < 0) {
cause = "failed";
valid_policy = 0;
}
......
......@@ -124,7 +124,8 @@ static void ima_rdwr_violation_check(struct file *file,
int must_measure,
char **pathbuf,
const char **pathname,
char *filename)
char *filename,
struct ima_namespace *ima_ns)
{
struct inode *inode = file_inode(file);
fmode_t mode = file->f_mode;
......@@ -294,7 +295,8 @@ void ima_file_free(struct file *file)
static int process_measurement(struct file *file, const struct cred *cred,
u32 secid, char *buf, loff_t size, int mask,
enum ima_hooks func)
enum ima_hooks func,
struct ima_namespace *ima_ns)
{
struct inode *inode = file_inode(file);
struct integrity_iint_cache *iint = NULL;
......@@ -319,7 +321,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
* Included is the appraise submask.
*/
action = ima_get_action(inode, cred, secid, mask, func, &pcr,
&template_desc, NULL);
&template_desc, NULL, ima_ns);
violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) &&
(ima_policy_flag & IMA_MEASURE));
if (!action && !violation_check)
......@@ -341,7 +343,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
if (!rc && violation_check)
ima_rdwr_violation_check(file, iint, action & IMA_MEASURE,
&pathbuf, &pathname, filename);
&pathbuf, &pathname, filename, ima_ns);
inode_unlock(inode);
......@@ -442,10 +444,11 @@ static int process_measurement(struct file *file, const struct cred *cred,
xattr_value, xattr_len, modsig, pcr,
template_desc,
ima_digest_allow(found_digest,
IMA_MEASURE));
IMA_MEASURE),
ima_ns);
if (rc == 0 && (action & IMA_APPRAISE_SUBMASK)) {
rc = ima_check_blacklist(iint, modsig, pcr);
rc = ima_check_blacklist(iint, modsig, pcr, ima_ns);
if (rc != -EPERM) {
inode_lock(inode);
rc = ima_appraise_measurement(func, iint, file,
......@@ -501,7 +504,7 @@ int ima_file_mmap(struct file *file, unsigned long prot)
if (file && (prot & PROT_EXEC)) {
security_task_getsecid(current, &secid);
return process_measurement(file, current_cred(), secid, NULL,
0, MAY_EXEC, MMAP_CHECK);
0, MAY_EXEC, MMAP_CHECK, NULL);
}
return 0;
......@@ -540,7 +543,7 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
security_task_getsecid(current, &secid);
inode = file_inode(vma->vm_file);
action = ima_get_action(inode, current_cred(), secid, MAY_EXEC,
MMAP_CHECK, &pcr, &template, 0);
MMAP_CHECK, &pcr, &template, 0, NULL);
/* Is the mmap'ed file in policy? */
if (!(action & (IMA_MEASURE | IMA_APPRAISE_SUBMASK)))
......@@ -579,13 +582,13 @@ int ima_bprm_check(struct linux_binprm *bprm)
security_task_getsecid(current, &secid);
ret = process_measurement(bprm->file, current_cred(), secid, NULL, 0,
MAY_EXEC, BPRM_CHECK);
MAY_EXEC, BPRM_CHECK, NULL);
if (ret)
return ret;
security_cred_getsecid(bprm->cred, &secid);
return process_measurement(bprm->file, bprm->cred, secid, NULL, 0,
MAY_EXEC, CREDS_CHECK);
MAY_EXEC, CREDS_CHECK, NULL);
}
/**
......@@ -606,7 +609,7 @@ int ima_file_check(struct file *file, int mask)
security_task_getsecid(current, &secid);
rc = process_measurement(file, current_cred(), secid, NULL, 0,
mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
MAY_APPEND), FILE_CHECK);
MAY_APPEND), FILE_CHECK, NULL);
if (ima_current_is_parser() && !rc)
ima_check_measured_appraised(file);
return rc;
......@@ -685,7 +688,7 @@ void ima_post_create_tmpfile(struct inode *inode)
struct integrity_iint_cache *iint;
int must_appraise;
must_appraise = ima_must_appraise(inode, MAY_ACCESS, FILE_CHECK);
must_appraise = ima_must_appraise(inode, MAY_ACCESS, FILE_CHECK, NULL);
if (!must_appraise)
return;
......@@ -712,7 +715,7 @@ void ima_post_path_mknod(struct dentry *dentry)
struct inode *inode = dentry->d_inode;
int must_appraise;
must_appraise = ima_must_appraise(inode, MAY_ACCESS, FILE_CHECK);
must_appraise = ima_must_appraise(inode, MAY_ACCESS, FILE_CHECK, NULL);
if (!must_appraise)
return;
......@@ -763,7 +766,7 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
func = read_idmap[read_id] ?: FILE_CHECK;
security_task_getsecid(current, &secid);
return process_measurement(file, current_cred(), secid, NULL,
0, MAY_READ, func);
0, MAY_READ, func, NULL);
}
const int read_idmap[READING_MAX_ID] = {
......@@ -807,7 +810,7 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
func = read_idmap[read_id] ?: FILE_CHECK;
security_task_getsecid(current, &secid);
return process_measurement(file, current_cred(), secid, buf, size,
MAY_READ, func);
MAY_READ, func, NULL);
}
/**
......@@ -905,7 +908,8 @@ int ima_post_load_data(char *buf, loff_t size,
*/
void process_buffer_measurement(struct inode *inode, const void *buf, int size,
const char *eventname, enum ima_hooks func,
int pcr, const char *keyring)
int pcr, const char *keyring,
struct ima_namespace *ima_ns)
{
int ret = 0;
const char *audit_cause = "ENOMEM";
......@@ -937,7 +941,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size,
if (func) {
security_task_getsecid(current, &secid);
action = ima_get_action(inode, current_cred(), secid, 0, func,
&pcr, &template, keyring);
&pcr, &template, keyring, NULL);
if (!(action & IMA_MEASURE))
return;
}
......@@ -1009,7 +1013,8 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size)
return;
process_buffer_measurement(file_inode(f.file), buf, size,
"kexec-cmdline", KEXEC_CMDLINE, 0, NULL);
"kexec-cmdline", KEXEC_CMDLINE, 0, NULL,
NULL);
fdput(f);
}
......@@ -1038,7 +1043,7 @@ static int __init init_ima(void)
pr_warn("Couldn't register LSM notifier, error %d\n", error);
if (!error)
ima_update_policy_flag();
ima_update_policy_flag(&init_ima_ns);
return error;
}
......
......@@ -692,6 +692,7 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
* @template_desc: the template that should be used for this rule
* @keyring: the keyring name, if given, to be used to check in the policy.
* keyring can be NULL if func is anything other than KEY_CHECK.
* @ima_ns: IMA namespace whose policies are being checked
*
* Measure decision based on func/mask/fsmagic and LSM(subj/obj/type)
* conditions.
......@@ -703,7 +704,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
enum ima_hooks func, int mask, int flags, int *pcr,
struct ima_template_desc **template_desc,
const char *keyring)
const char *keyring,
struct ima_namespace *ima_ns)
{
struct ima_rule_entry *entry;
int action = 0, actmask = flags | (flags << 1);
......@@ -756,8 +758,9 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
* loaded policy. Based on this flag, the decision to short circuit
* out of a function or not call the function in the first place
* can be made earlier.
* @ima_ns: pointer to the ima namespace whose policy flag is updated
*/
void ima_update_policy_flag(void)
void ima_update_policy_flag(struct ima_namespace *ima_ns)
{
struct ima_rule_entry *entry;
......@@ -786,7 +789,8 @@ static int ima_appraise_flag(enum ima_hooks func)
return 0;
}
static void __init add_rules(struct ima_rule_entry *entries, int count,
static void __init add_rules(struct ima_policy_data *policy_data,
struct ima_rule_entry *entries, int count,
enum policy_rule_list policy_rule)
{
int i = 0;
......@@ -914,19 +918,20 @@ void __init ima_init_policy(void)
/* if !ima_policy, we load NO default rules */
if (ima_policy)
add_rules(dont_measure_rules, ARRAY_SIZE(dont_measure_rules),
add_rules(NULL,
dont_measure_rules, ARRAY_SIZE(dont_measure_rules),
IMA_DEFAULT_POLICY);
switch (ima_policy) {
case ORIGINAL_TCB:
add_rules(original_measurement_rules,
add_rules(NULL, original_measurement_rules,
ARRAY_SIZE(original_measurement_rules),
IMA_DEFAULT_POLICY);
break;
case EXEC_TCB:
fallthrough;
case DEFAULT_TCB:
add_rules(default_measurement_rules,
add_rules(NULL, default_measurement_rules,
ARRAY_SIZE(default_measurement_rules),
IMA_DEFAULT_POLICY);
default:
......@@ -934,7 +939,7 @@ void __init ima_init_policy(void)
}
if (ima_policy)
add_rules(&ima_parser_measure_rule, 1, IMA_DEFAULT_POLICY);
add_rules(NULL, &ima_parser_measure_rule, 1, IMA_DEFAULT_POLICY);
/*
* Based on runtime secure boot flags, insert arch specific measurement
......@@ -946,7 +951,7 @@ void __init ima_init_policy(void)
if (!arch_entries)
pr_info("No architecture policies found\n");
else
add_rules(arch_policy_entry, arch_entries,
add_rules(NULL, arch_policy_entry, arch_entries,
IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY);
/*
......@@ -954,7 +959,8 @@ void __init ima_init_policy(void)
* signatures, prior to other appraise rules.
*/
if (ima_use_secure_boot || ima_use_appraise_exec_tcb)
add_rules(secure_boot_rules, ARRAY_SIZE(secure_boot_rules),
add_rules(NULL,
secure_boot_rules, ARRAY_SIZE(secure_boot_rules),
IMA_DEFAULT_POLICY);
/*
......@@ -966,32 +972,34 @@ void __init ima_init_policy(void)
build_appraise_entries = ARRAY_SIZE(build_appraise_rules);
if (build_appraise_entries) {
if (ima_use_secure_boot)
add_rules(build_appraise_rules, build_appraise_entries,
add_rules(NULL,
build_appraise_rules, build_appraise_entries,
IMA_CUSTOM_POLICY);
else
add_rules(build_appraise_rules, build_appraise_entries,
add_rules(NULL,
build_appraise_rules, build_appraise_entries,
IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY);
}
if (ima_use_appraise_tcb || ima_use_appraise_exec_tcb)
add_rules(default_appraise_rules,
add_rules(NULL, default_appraise_rules,
ARRAY_SIZE(default_appraise_rules),
IMA_DEFAULT_POLICY);
if (ima_use_appraise_exec_tcb)
add_rules(appraise_exec_rules,
add_rules(NULL, appraise_exec_rules,
ARRAY_SIZE(appraise_exec_rules),
IMA_DEFAULT_POLICY);
if (ima_use_secure_boot || ima_use_appraise_tcb ||
ima_use_appraise_exec_tcb)
add_rules(&ima_parser_appraise_rule, 1, IMA_DEFAULT_POLICY);
add_rules(NULL, &ima_parser_appraise_rule, 1, IMA_DEFAULT_POLICY);
ima_update_policy_flag();
ima_update_policy_flag(NULL);
}
/* Make sure we have a valid policy, at least containing some rules. */
int ima_check_policy(void)
int ima_check_policy(const struct ima_namespace *ima_ns)
{
if (list_empty(&ima_temp_rules))
return -EINVAL;
......@@ -1027,7 +1035,7 @@ void ima_update_policy(void)
*/
kfree(arch_policy_entry);
}
ima_update_policy_flag();
ima_update_policy_flag(NULL);
/* Custom IMA policy has been loaded */
ima_process_queued_keys();
......
......@@ -162,7 +162,8 @@ void ima_process_queued_keys(void)
entry->payload_len,
entry->keyring_name,
KEY_CHECK, 0,
entry->keyring_name);
entry->keyring_name,
NULL);
list_del(&entry->list);
ima_free_key_entry(entry);
}
......
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