| Message ID | 20200730034724.3298-3-nramas@linux.microsoft.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | LSM: Measure security module data | expand |
On 2020-07-29 20:47:22, Lakshmi Ramasubramanian wrote: > IMA subsystem needs to define IMA hooks that the security modules can > call to measure state and policy data. > > Define two new IMA hooks, namely ima_lsm_state() and ima_lsm_policy(), > that the security modules can call to measure LSM state and LSM policy > respectively. Return the status of the measurement operation from these > two IMA hooks. > > Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com> Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com> Tyler > --- > include/linux/ima.h | 14 +++++++++ > security/integrity/ima/ima.h | 6 ++-- > security/integrity/ima/ima_main.c | 50 ++++++++++++++++++++++++++----- > 3 files changed, 60 insertions(+), 10 deletions(-) > > diff --git a/include/linux/ima.h b/include/linux/ima.h > index d15100de6cdd..442ca0dce3c8 100644 > --- a/include/linux/ima.h > +++ b/include/linux/ima.h > @@ -26,6 +26,10 @@ extern int ima_post_read_file(struct file *file, void *buf, loff_t size, > extern void ima_post_path_mknod(struct dentry *dentry); > extern int ima_file_hash(struct file *file, char *buf, size_t buf_size); > extern void ima_kexec_cmdline(int kernel_fd, const void *buf, int size); > +extern int ima_measure_lsm_state(const char *lsm_event_name, const void *buf, > + int size); > +extern int ima_measure_lsm_policy(const char *lsm_event_name, const void *buf, > + int size); > > #ifdef CONFIG_IMA_KEXEC > extern void ima_add_kexec_buffer(struct kimage *image); > @@ -104,6 +108,16 @@ static inline int ima_file_hash(struct file *file, char *buf, size_t buf_size) > } > > static inline void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) {} > +static inline int ima_measure_lsm_state(const char *lsm_event_name, > + const void *buf, int size) > +{ > + return -EOPNOTSUPP; > +} > +static inline int ima_measure_lsm_policy(const char *lsm_event_name, > + const void *buf, int size) > +{ > + return -EOPNOTSUPP; > +} > #endif /* CONFIG_IMA */ > > #ifndef CONFIG_IMA_KEXEC > diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h > index 1b5f4b2f17d0..8ed9f5e1dd40 100644 > --- a/security/integrity/ima/ima.h > +++ b/security/integrity/ima/ima.h > @@ -267,9 +267,9 @@ 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); > -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 process_buffer_measurement(struct inode *inode, const void *buf, int size, > + const char *eventname, enum ima_hooks func, > + int pcr, const char *keyring); > void ima_audit_measurement(struct integrity_iint_cache *iint, > const unsigned char *filename); > int ima_alloc_init_template(struct ima_event_data *event_data, > diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c > index 8a91711ca79b..74d421e40c8f 100644 > --- a/security/integrity/ima/ima_main.c > +++ b/security/integrity/ima/ima_main.c > @@ -736,9 +736,9 @@ int ima_load_data(enum kernel_load_data_id id) > * > * Based on policy, the buffer is measured into the ima log. > */ > -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 process_buffer_measurement(struct inode *inode, const void *buf, int size, > + const char *eventname, enum ima_hooks func, > + int pcr, const char *keyring) > { > int ret = 0; > const char *audit_cause = "ENOMEM"; > @@ -758,7 +758,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, > u32 secid; > > if (!ima_policy_flag) > - return; > + return 0; > > /* > * Both LSM hooks and auxilary based buffer measurements are > @@ -772,7 +772,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, > action = ima_get_action(inode, current_cred(), secid, 0, func, > &pcr, &template, keyring); > if (!(action & IMA_MEASURE)) > - return; > + return 0; > } > > if (!pcr) > @@ -787,7 +787,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, > pr_err("template %s init failed, result: %d\n", > (strlen(template->name) ? > template->name : template->fmt), ret); > - return; > + return ret; > } > } > > @@ -819,7 +819,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, > func_measure_str(func), > audit_cause, ret, 0, ret); > > - return; > + return ret; > } > > /** > @@ -846,6 +846,42 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) > fdput(f); > } > > +/** > + * ima_measure_lsm_state - measure LSM specific state > + * @lsm_event_name: LSM event > + * @buf: pointer to buffer containing LSM specific state > + * @size: Number of bytes in buf > + * > + * Buffers can only be measured, not appraised. > + */ > +int ima_measure_lsm_state(const char *lsm_event_name, const void *buf, > + int size) > +{ > + if (!lsm_event_name || !buf || !size) > + return -EINVAL; > + > + return process_buffer_measurement(NULL, buf, size, lsm_event_name, > + LSM_STATE, 0, NULL); > +} > + > +/** > + * ima_measure_lsm_policy - measure LSM specific policy > + * @lsm_event_name: LSM event > + * @buf: pointer to buffer containing LSM specific policy > + * @size: Number of bytes in buf > + * > + * Buffers can only be measured, not appraised. > + */ > +int ima_measure_lsm_policy(const char *lsm_event_name, const void *buf, > + int size) > +{ > + if (!lsm_event_name || !buf || !size) > + return -EINVAL; > + > + return process_buffer_measurement(NULL, buf, size, lsm_event_name, > + LSM_POLICY, 0, NULL); > +} > + > static int __init init_ima(void) > { > int error; > -- > 2.27.0
diff --git a/include/linux/ima.h b/include/linux/ima.h index d15100de6cdd..442ca0dce3c8 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -26,6 +26,10 @@ extern int ima_post_read_file(struct file *file, void *buf, loff_t size, extern void ima_post_path_mknod(struct dentry *dentry); extern int ima_file_hash(struct file *file, char *buf, size_t buf_size); extern void ima_kexec_cmdline(int kernel_fd, const void *buf, int size); +extern int ima_measure_lsm_state(const char *lsm_event_name, const void *buf, + int size); +extern int ima_measure_lsm_policy(const char *lsm_event_name, const void *buf, + int size); #ifdef CONFIG_IMA_KEXEC extern void ima_add_kexec_buffer(struct kimage *image); @@ -104,6 +108,16 @@ static inline int ima_file_hash(struct file *file, char *buf, size_t buf_size) } static inline void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) {} +static inline int ima_measure_lsm_state(const char *lsm_event_name, + const void *buf, int size) +{ + return -EOPNOTSUPP; +} +static inline int ima_measure_lsm_policy(const char *lsm_event_name, + const void *buf, int size) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_IMA */ #ifndef CONFIG_IMA_KEXEC diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 1b5f4b2f17d0..8ed9f5e1dd40 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -267,9 +267,9 @@ 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); -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 process_buffer_measurement(struct inode *inode, const void *buf, int size, + const char *eventname, enum ima_hooks func, + int pcr, const char *keyring); void ima_audit_measurement(struct integrity_iint_cache *iint, const unsigned char *filename); int ima_alloc_init_template(struct ima_event_data *event_data, diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 8a91711ca79b..74d421e40c8f 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -736,9 +736,9 @@ int ima_load_data(enum kernel_load_data_id id) * * Based on policy, the buffer is measured into the ima log. */ -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 process_buffer_measurement(struct inode *inode, const void *buf, int size, + const char *eventname, enum ima_hooks func, + int pcr, const char *keyring) { int ret = 0; const char *audit_cause = "ENOMEM"; @@ -758,7 +758,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, u32 secid; if (!ima_policy_flag) - return; + return 0; /* * Both LSM hooks and auxilary based buffer measurements are @@ -772,7 +772,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, action = ima_get_action(inode, current_cred(), secid, 0, func, &pcr, &template, keyring); if (!(action & IMA_MEASURE)) - return; + return 0; } if (!pcr) @@ -787,7 +787,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, pr_err("template %s init failed, result: %d\n", (strlen(template->name) ? template->name : template->fmt), ret); - return; + return ret; } } @@ -819,7 +819,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, func_measure_str(func), audit_cause, ret, 0, ret); - return; + return ret; } /** @@ -846,6 +846,42 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size) fdput(f); } +/** + * ima_measure_lsm_state - measure LSM specific state + * @lsm_event_name: LSM event + * @buf: pointer to buffer containing LSM specific state + * @size: Number of bytes in buf + * + * Buffers can only be measured, not appraised. + */ +int ima_measure_lsm_state(const char *lsm_event_name, const void *buf, + int size) +{ + if (!lsm_event_name || !buf || !size) + return -EINVAL; + + return process_buffer_measurement(NULL, buf, size, lsm_event_name, + LSM_STATE, 0, NULL); +} + +/** + * ima_measure_lsm_policy - measure LSM specific policy + * @lsm_event_name: LSM event + * @buf: pointer to buffer containing LSM specific policy + * @size: Number of bytes in buf + * + * Buffers can only be measured, not appraised. + */ +int ima_measure_lsm_policy(const char *lsm_event_name, const void *buf, + int size) +{ + if (!lsm_event_name || !buf || !size) + return -EINVAL; + + return process_buffer_measurement(NULL, buf, size, lsm_event_name, + LSM_POLICY, 0, NULL); +} + static int __init init_ima(void) { int error;
IMA subsystem needs to define IMA hooks that the security modules can call to measure state and policy data. Define two new IMA hooks, namely ima_lsm_state() and ima_lsm_policy(), that the security modules can call to measure LSM state and LSM policy respectively. Return the status of the measurement operation from these two IMA hooks. Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com> --- include/linux/ima.h | 14 +++++++++ security/integrity/ima/ima.h | 6 ++-- security/integrity/ima/ima_main.c | 50 ++++++++++++++++++++++++++----- 3 files changed, 60 insertions(+), 10 deletions(-)