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apparmor: convert change_profile to use fqname later to give better control

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Moving the use of fqname to later allows learning profiles to be based
on the fqname request instead of just the hname. It also allows cleaning
up some of the name parsing and lookup by allowing the use of
the fqlookupn_profile() lib fn.

Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2017-01-16 00:43:06 -08:00
parent c3e1e584ad
commit aa9a39ad8f
5 changed files with 28 additions and 66 deletions
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1
security/apparmor/apparmorfs.c
View file

@ -1052,6 +1052,7 @@ static struct aa_fs_entry aa_fs_entry_domain[] = {
AA_FS_FILE_BOOLEAN("change_onexec", 1),
AA_FS_FILE_BOOLEAN("change_profile", 1),
AA_FS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
AA_FS_FILE_STRING("version", "1.2"),
{ }
};

61
security/apparmor/domain.c
View file

@ -729,8 +729,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
/**
* aa_change_profile - perform a one-way profile transition
* @ns_name: name of the profile namespace to change to (MAYBE NULL)
* @hname: name of profile to change to (MAYBE NULL)
* @fqname: name of profile may include namespace (NOT NULL)
* @onexec: whether this transition is to take place immediately or at exec
* @permtest: true if this is just a permission test
*
@ -742,19 +741,20 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
*
* Returns %0 on success, error otherwise.
*/
int aa_change_profile(const char *ns_name, const char *hname, bool onexec,
bool permtest)
int aa_change_profile(const char *fqname, bool onexec,
bool permtest, bool stack)
{
const struct cred *cred;
struct aa_profile *profile, *target = NULL;
struct aa_ns *ns = NULL;
struct file_perms perms = {};
const char *name = NULL, *info = NULL, *op;
const char *info = NULL, *op;
int error = 0;
u32 request;
if (!hname && !ns_name)
if (!fqname || !*fqname) {
AA_DEBUG("no profile name");
return -EINVAL;
}
if (onexec) {
request = AA_MAY_ONEXEC;
@ -779,44 +779,15 @@ int aa_change_profile(const char *ns_name, const char *hname, bool onexec,
return -EPERM;
}
if (ns_name) {
/* released below */
ns = aa_find_ns(profile->ns, ns_name);
if (!ns) {
/* we don't create new namespace in complain mode */
name = ns_name;
info = "namespace not found";
error = -ENOENT;
goto audit;
}
} else
/* released below */
ns = aa_get_ns(profile->ns);
/* if the name was not specified, use the name of the current profile */
if (!hname) {
if (unconfined(profile))
hname = ns->unconfined->base.hname;
else
hname = profile->base.hname;
}
perms = change_profile_perms(profile, ns, hname, request,
profile->file.start);
if (!(perms.allow & request)) {
error = -EACCES;
goto audit;
}
/* released below */
target = aa_lookup_profile(ns, hname);
target = aa_fqlookupn_profile(profile, fqname, strlen(fqname));
if (!target) {
info = "profile not found";
error = -ENOENT;
if (permtest || !COMPLAIN_MODE(profile))
goto audit;
/* released below */
target = aa_new_null_profile(profile, false, hname, GFP_KERNEL);
target = aa_new_null_profile(profile, false, fqname,
GFP_KERNEL);
if (!target) {
info = "failed null profile create";
error = -ENOMEM;
@ -824,6 +795,13 @@ int aa_change_profile(const char *ns_name, const char *hname, bool onexec,
}
}
perms = change_profile_perms(profile, target->ns, target->base.hname,
request, profile->file.start);
if (!(perms.allow & request)) {
error = -EACCES;
goto audit;
}
/* check if tracing task is allowed to trace target domain */
error = may_change_ptraced_domain(target);
if (error) {
@ -841,10 +819,9 @@ int aa_change_profile(const char *ns_name, const char *hname, bool onexec,
audit:
if (!permtest)
error = aa_audit_file(profile, &perms, op, request, name,
hname, GLOBAL_ROOT_UID, info, error);
error = aa_audit_file(profile, &perms, op, request, NULL,
fqname, GLOBAL_ROOT_UID, info, error);
aa_put_ns(ns);
aa_put_profile(target);
put_cred(cred);

4
security/apparmor/include/domain.h
View file

@ -30,7 +30,7 @@ void apparmor_bprm_committed_creds(struct linux_binprm *bprm);
void aa_free_domain_entries(struct aa_domain *domain);
int aa_change_hat(const char *hats[], int count, u64 token, bool permtest);
int aa_change_profile(const char *ns_name, const char *name, bool onexec,
bool permtest);
int aa_change_profile(const char *fqname, bool onexec, bool permtest,
bool stack);
#endif /* __AA_DOMAIN_H */

12
security/apparmor/lsm.c
View file

@ -543,17 +543,17 @@ static int apparmor_setprocattr(struct task_struct *task, char *name,
error = aa_setprocattr_changehat(args, arg_size,
AA_DO_TEST);
} else if (strcmp(command, "changeprofile") == 0) {
error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
!AA_DO_TEST);
error = aa_change_profile(args, !AA_ONEXEC,
!AA_DO_TEST, false);
} else if (strcmp(command, "permprofile") == 0) {
error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
AA_DO_TEST);
error = aa_change_profile(args, !AA_ONEXEC, AA_DO_TEST,
false);
} else
goto fail;
} else if (strcmp(name, "exec") == 0) {
if (strcmp(command, "exec") == 0)
error = aa_setprocattr_changeprofile(args, AA_ONEXEC,
!AA_DO_TEST);
error = aa_change_profile(args, AA_ONEXEC, !AA_DO_TEST,
false);
else
goto fail;
} else

16
security/apparmor/procattr.c
View file

@ -149,19 +149,3 @@ int aa_setprocattr_changehat(char *args, size_t size, int test)
return aa_change_hat(hats, count, token, test);
}
/**
* aa_setprocattr_changeprofile - handle procattr interface to changeprofile
* @fqname: args received from writting to /proc/<pid>/attr/current (NOT NULL)
* @onexec: true if change_profile should be delayed until exec
* @test: true if this is a test of change_profile permissions
*
* Returns: %0 or error code if change_profile fails
*/
int aa_setprocattr_changeprofile(char *fqname, bool onexec, int test)
{
char *name, *ns_name;
name = aa_split_fqname(fqname, &ns_name);
return aa_change_profile(ns_name, name, onexec, test);
}