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Commit ab61d38e authored by Eric Paris's avatar Eric Paris
Browse files

audit: make validity checking generic 



We have 2 interfaces to send audit rules.  Rather than check validity of
things in 2 places make a helper function.

Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent 62062cf8

kernel/auditfilter.c

+70 −76
Original line number Diff line number Diff line
@@ -310,7 +310,7 @@ static u32 audit_to_op(u32 op) 
	return n;

}



/* check if a field is valid for a given list */

/* check if an audit field is valid */

static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)

{

	switch(f->type) {
@@ -320,6 +320,69 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f) 
			return -EINVAL;

		break;

	};



	switch(f->type) {

	default:

		return -EINVAL;

	case AUDIT_UID:

	case AUDIT_EUID:

	case AUDIT_SUID:

	case AUDIT_FSUID:

	case AUDIT_LOGINUID:

	case AUDIT_OBJ_UID:

	case AUDIT_GID:

	case AUDIT_EGID:

	case AUDIT_SGID:

	case AUDIT_FSGID:

	case AUDIT_OBJ_GID:

	case AUDIT_PID:

	case AUDIT_PERS:

	case AUDIT_MSGTYPE:

	case AUDIT_PPID:

	case AUDIT_DEVMAJOR:

	case AUDIT_DEVMINOR:

	case AUDIT_EXIT:

	case AUDIT_SUCCESS:

		/* bit ops are only useful on syscall args */

		if (f->op == Audit_bitmask || f->op == Audit_bittest)

			return -EINVAL;

		break;

	case AUDIT_ARG0:

	case AUDIT_ARG1:

	case AUDIT_ARG2:

	case AUDIT_ARG3:

	case AUDIT_SUBJ_USER:

	case AUDIT_SUBJ_ROLE:

	case AUDIT_SUBJ_TYPE:

	case AUDIT_SUBJ_SEN:

	case AUDIT_SUBJ_CLR:

	case AUDIT_OBJ_USER:

	case AUDIT_OBJ_ROLE:

	case AUDIT_OBJ_TYPE:

	case AUDIT_OBJ_LEV_LOW:

	case AUDIT_OBJ_LEV_HIGH:

	case AUDIT_WATCH:

	case AUDIT_DIR:

	case AUDIT_FILTERKEY:

		break;

	/* arch is only allowed to be = or != */

	case AUDIT_ARCH:

		if (f->op != Audit_not_equal && f->op != Audit_equal)

			return -EINVAL;

		break;

	case AUDIT_PERM:

		if (f->val & ~15)

			return -EINVAL;

		break;

	case AUDIT_FILETYPE:

		if (f->val & ~S_IFMT)

			return -EINVAL;

		break;

	case AUDIT_FIELD_COMPARE:

		if (f->val > AUDIT_MAX_FIELD_COMPARE)

			return -EINVAL;

		break;

	};

	return 0;

}
@@ -361,18 +424,17 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule) 
		if (f->op == Audit_bad)

			goto exit_free;



		switch(f->type) {

		default:

		err = audit_field_valid(entry, f);

		if (err)

			goto exit_free;



		err = -EINVAL;

		switch (f->type) {

		case AUDIT_UID:

		case AUDIT_EUID:

		case AUDIT_SUID:

		case AUDIT_FSUID:

		case AUDIT_LOGINUID:

			/* bit ops not implemented for uid comparisons */

			if (f->op == Audit_bitmask || f->op == Audit_bittest)

				goto exit_free;



			f->uid = make_kuid(current_user_ns(), f->val);

			if (!uid_valid(f->uid))

				goto exit_free;
@@ -381,45 +443,13 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule) 
		case AUDIT_EGID:

		case AUDIT_SGID:

		case AUDIT_FSGID:

			/* bit ops not implemented for gid comparisons */

			if (f->op == Audit_bitmask || f->op == Audit_bittest)

				goto exit_free;



			f->gid = make_kgid(current_user_ns(), f->val);

			if (!gid_valid(f->gid))

				goto exit_free;

			break;

		case AUDIT_PID:

		case AUDIT_PERS:

		case AUDIT_MSGTYPE:

		case AUDIT_PPID:

		case AUDIT_DEVMAJOR:

		case AUDIT_DEVMINOR:

		case AUDIT_EXIT:

		case AUDIT_SUCCESS:

			/* bit ops are only useful on syscall args */

			if (f->op == Audit_bitmask || f->op == Audit_bittest)

				goto exit_free;

			break;

		case AUDIT_ARG0:

		case AUDIT_ARG1:

		case AUDIT_ARG2:

		case AUDIT_ARG3:

			break;

		/* arch is only allowed to be = or != */

		case AUDIT_ARCH:

			if (f->op != Audit_not_equal && f->op != Audit_equal)

				goto exit_free;

			entry->rule.arch_f = f;

			break;

		case AUDIT_PERM:

			if (f->val & ~15)

				goto exit_free;

			break;

		case AUDIT_FILETYPE:

			if (f->val & ~S_IFMT)

				goto exit_free;

			break;

		case AUDIT_INODE:

			err = audit_to_inode(&entry->rule, f);

			if (err)
@@ -477,7 +507,6 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, 
			goto exit_free;



		err = -EINVAL;



		switch (f->type) {

		case AUDIT_UID:

		case AUDIT_EUID:
@@ -485,10 +514,6 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, 
		case AUDIT_FSUID:

		case AUDIT_LOGINUID:

		case AUDIT_OBJ_UID:

			/* bit ops not implemented for uid comparisons */

			if (f->op == Audit_bitmask || f->op == Audit_bittest)

				goto exit_free;



			f->uid = make_kuid(current_user_ns(), f->val);

			if (!uid_valid(f->uid))

				goto exit_free;
@@ -498,27 +523,10 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, 
		case AUDIT_SGID:

		case AUDIT_FSGID:

		case AUDIT_OBJ_GID:

			/* bit ops not implemented for gid comparisons */

			if (f->op == Audit_bitmask || f->op == Audit_bittest)

				goto exit_free;



			f->gid = make_kgid(current_user_ns(), f->val);

			if (!gid_valid(f->gid))

				goto exit_free;

			break;

		case AUDIT_PID:

		case AUDIT_PERS:

		case AUDIT_MSGTYPE:

		case AUDIT_PPID:

		case AUDIT_DEVMAJOR:

		case AUDIT_DEVMINOR:

		case AUDIT_EXIT:

		case AUDIT_SUCCESS:

		case AUDIT_ARG0:

		case AUDIT_ARG1:

		case AUDIT_ARG2:

		case AUDIT_ARG3:

			break;

		case AUDIT_ARCH:

			entry->rule.arch_f = f;

			break;
@@ -589,20 +597,6 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, 
			entry->rule.buflen += f->val;

			entry->rule.filterkey = str;

			break;

		case AUDIT_PERM:

			if (f->val & ~15)

				goto exit_free;

			break;

		case AUDIT_FILETYPE:

			if (f->val & ~S_IFMT)

				goto exit_free;

			break;

		case AUDIT_FIELD_COMPARE:

			if (f->val > AUDIT_MAX_FIELD_COMPARE)

				goto exit_free;

			break;

		default:

			goto exit_free;

		}

	}