Messages in this thread | | | From | Paul Moore <> | Subject | Re: [PATCH 6/9] LSM/Audit: Introduce generic Audit LSM hooks | Date | Mon, 3 Mar 2008 18:36:15 -0500 |
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On Saturday 01 March 2008 3:00:05 pm Ahmed S. Darwish wrote: > Introduce a generic Audit interface for security modules > by adding the following new LSM hooks: > > audit_rule_init(field, op, rulestr, lsmrule) > audit_rule_known(krule) > audit_rule_match(secid, field, op, rule, actx) > audit_rule_free(rule) > > Those hooks are only available if CONFIG_AUDIT is enabled. > > Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> > Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
Reviewed-by: Paul Moore <paul.moore@hp.com>
> --- > > include/linux/security.h | 72 > +++++++++++++++++++++++++++++++++++++++++++++++ security/dummy.c > | 31 +++++++++++++++++++- > security/security.c | 25 ++++++++++++++++ > 3 files changed, 127 insertions(+), 1 deletion(-) > > diff --git a/include/linux/security.h b/include/linux/security.h > index b5d1ad7..eb663e5 100644 > --- a/include/linux/security.h > +++ b/include/linux/security.h > @@ -43,6 +43,7 @@ > extern unsigned securebits; > > struct ctl_table; > +struct audit_krule; > > /* > * These functions are in security/capability.c and are used > @@ -1227,6 +1228,37 @@ struct request_sock; > * @secdata contains the security context. > * @seclen contains the length of the security context. > * > + * Security hooks for Audit > + * > + * @audit_rule_init: > + * Allocate and initialize an LSM audit rule structure. > + * @field contains the required Audit action. Fields flags are > defined in include/linux/audit.h + * @op contains the operator the > rule uses. > + * @rulestr contains the context where the rule will be applied to. > + * @lsmrule contains a pointer to receive the result. > + * Return 0 if @lsmrule has been successfully set, > + * -EINVAL in case of an invalid rule. > + * > + * @audit_rule_known: > + * Specifies whether given @rule contains any fields related to > current LSM. + * @rule contains the audit rule of interest. > + * Return 1 in case of relation found, 0 otherwise. > + * > + * @audit_rule_match: > + * Determine if given @secid matches a rule previously approved > + * by @audit_rule_known. > + * @secid contains the security id in question. > + * @field contains the field which relates to current LSM. > + * @op contains the operator that will be used for matching. > + * @rule points to the audit rule that will be checked against. > + * @actx points to the audit context associated with the check. > + * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on > failure. + * > + * @audit_rule_free: > + * Deallocate the LSM audit rule structure previously allocated by > + * audit_rule_init. > + * @rule contains the allocated rule > + * > * This is the main security structure. > */ > struct security_operations { > @@ -1487,6 +1519,13 @@ struct security_operations { > int (*key_getsecurity)(struct key *key, char **_buffer); > #endif /* CONFIG_KEYS */ > > +#ifdef CONFIG_AUDIT > + int (*audit_rule_init)(u32 field, u32 op, char *rulestr, void > **lsmrule); + int (*audit_rule_known)(struct audit_krule *krule); > + int (*audit_rule_match)(u32 secid, u32 field, u32 op, void > *lsmrule, + struct audit_context *actx); > + void (*audit_rule_free)(void *lsmrule); > +#endif /* CONFIG_AUDIT */ > }; > > /* prototypes */ > @@ -2670,5 +2709,38 @@ static inline int > security_key_getsecurity(struct key *key, char **_buffer) #endif > #endif /* CONFIG_KEYS */ > > +#ifdef CONFIG_AUDIT > +#ifdef CONFIG_SECURITY > +int security_audit_rule_init(u32 field, u32 op, char *rulestr, void > **lsmrule); +int security_audit_rule_known(struct audit_krule > *krule); > +int security_audit_rule_match(u32 secid, u32 field, u32 op, void > *lsmrule, + struct audit_context *actx); > +void security_audit_rule_free(void *lsmrule); > + > +#else > + > +static inline int security_audit_rule_init(u32 field, u32 op, char > *rulestr, + void **lsmrule) > +{ > + return 0; > +} > + > +static inline int security_audit_rule_known(struct audit_krule > *krule) +{ > + return 0; > +} > + > +static inline int security_audit_rule_match(u32 secid, u32 field, > u32 op, + void *lsmrule, struct audit_context *actx) > +{ > + return 0; > +} > + > +static inline void security_audit_rule_free(void *lsmrule) > +{ } > + > +#endif /* CONFIG_SECURITY */ > +#endif /* CONFIG_AUDIT */ > + > #endif /* ! __LINUX_SECURITY_H */ > > diff --git a/security/dummy.c b/security/dummy.c > index b4967f4..241ab20 100644 > --- a/security/dummy.c > +++ b/security/dummy.c > @@ -998,6 +998,30 @@ static int dummy_key_getsecurity(struct key > *key, char **_buffer) > > #endif /* CONFIG_KEYS */ > > +#ifdef CONFIG_AUDIT > +static inline int dummy_audit_rule_init(u32 field, u32 op, char > *rulestr, + void **lsmrule) > +{ > + return 0; > +} > + > +static inline int dummy_audit_rule_known(struct audit_krule *krule) > +{ > + return 0; > +} > + > +static inline int dummy_audit_rule_match(u32 secid, u32 field, u32 > op, + void *lsmrule, > + struct audit_context *actx) > +{ > + return 0; > +} > + > +static inline void dummy_audit_rule_free(void *lsmrule) > +{ } > + > +#endif /* CONFIG_AUDIT */ > + > struct security_operations dummy_security_ops; > > #define set_to_dummy_if_null(ops, function) \ > @@ -1187,6 +1211,11 @@ void security_fixup_ops (struct > security_operations *ops) set_to_dummy_if_null(ops, key_permission); > set_to_dummy_if_null(ops, key_getsecurity); > #endif /* CONFIG_KEYS */ > - > +#ifdef CONFIG_AUDIT > + set_to_dummy_if_null(ops, audit_rule_init); > + set_to_dummy_if_null(ops, audit_rule_known); > + set_to_dummy_if_null(ops, audit_rule_match); > + set_to_dummy_if_null(ops, audit_rule_free); > +#endif > } > > diff --git a/security/security.c b/security/security.c > index 1748329..1bf2ee4 100644 > --- a/security/security.c > +++ b/security/security.c > @@ -1118,3 +1118,28 @@ int security_key_getsecurity(struct key *key, > char **_buffer) } > > #endif /* CONFIG_KEYS */ > + > +#ifdef CONFIG_AUDIT > + > +int security_audit_rule_init(u32 field, u32 op, char *rulestr, void > **lsmrule) +{ > + return security_ops->audit_rule_init(field, op, rulestr, lsmrule); > +} > + > +int security_audit_rule_known(struct audit_krule *krule) > +{ > + return security_ops->audit_rule_known(krule); > +} > + > +void security_audit_rule_free(void *lsmrule) > +{ > + security_ops->audit_rule_free(lsmrule); > +} > + > +int security_audit_rule_match(u32 secid, u32 field, u32 op, void > *lsmrule, + struct audit_context *actx) > +{ > + return security_ops->audit_rule_match(secid, field, op, lsmrule, > actx); +} > + > +#endif /* CONFIG_AUDIT */
-- paul moore linux security @ hp
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