Message ID | cc924bc23937ea3d65b4b2b625796ee61a5fb4da.1528304204.git.rgb@redhat.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
On Wed, Jun 6, 2018 at 1:03 PM Richard Guy Briggs <rgb@redhat.com> wrote: > Implement audit container identifier filtering using the AUDIT_CONTID > field name to send an 8-character string representing a u64 since the > value field is only u32. > > Sending it as two u32 was considered, but gathering and comparing two > fields was more complex. > > The feature indicator is AUDIT_FEATURE_BITMAP_CONTAINERID_FILTER. We've had some discussions about starting to be a bit more "stingy" with our feature bitmap fields, and normally I'm not sure I would want to burn one on a new filter (we should be able to fail safely here), but considering the significance of the audit container ID work I think it might be okay to burn a bit :) How about renaming this to just AUDIT_FEATURE_BITMAP_CONTAINERID? > See: https://github.com/linux-audit/audit-kernel/issues/91 > See: https://github.com/linux-audit/audit-userspace/issues/40 > See: https://github.com/linux-audit/audit-testsuite/issues/64 > See: https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID > Signed-off-by: Richard Guy Briggs <rgb@redhat.com> > --- > include/linux/audit.h | 1 + > include/uapi/linux/audit.h | 5 ++++- > kernel/audit.h | 1 + > kernel/auditfilter.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++ > kernel/auditsc.c | 3 +++ > 5 files changed, 56 insertions(+), 1 deletion(-) > > diff --git a/include/linux/audit.h b/include/linux/audit.h > index f549121..1e37abf 100644 > --- a/include/linux/audit.h > +++ b/include/linux/audit.h > @@ -76,6 +76,7 @@ struct audit_field { > u32 type; > union { > u32 val; > + u64 val64; > kuid_t uid; > kgid_t gid; > struct { > diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h > index 469ab25..b440558 100644 > --- a/include/uapi/linux/audit.h > +++ b/include/uapi/linux/audit.h > @@ -262,6 +262,7 @@ > #define AUDIT_LOGINUID_SET 24 > #define AUDIT_SESSIONID 25 /* Session ID */ > #define AUDIT_FSTYPE 26 /* FileSystem Type */ > +#define AUDIT_CONTID 27 /* Container ID */ > > /* These are ONLY useful when checking > * at syscall exit time (AUDIT_AT_EXIT). */ > @@ -342,6 +343,7 @@ enum { > #define AUDIT_FEATURE_BITMAP_SESSIONID_FILTER 0x00000010 > #define AUDIT_FEATURE_BITMAP_LOST_RESET 0x00000020 > #define AUDIT_FEATURE_BITMAP_FILTER_FS 0x00000040 > +#define AUDIT_FEATURE_BITMAP_CONTAINERID_FILTER 0x00000080 > > #define AUDIT_FEATURE_BITMAP_ALL (AUDIT_FEATURE_BITMAP_BACKLOG_LIMIT | \ > AUDIT_FEATURE_BITMAP_BACKLOG_WAIT_TIME | \ > @@ -349,7 +351,8 @@ enum { > AUDIT_FEATURE_BITMAP_EXCLUDE_EXTEND | \ > AUDIT_FEATURE_BITMAP_SESSIONID_FILTER | \ > AUDIT_FEATURE_BITMAP_LOST_RESET | \ > - AUDIT_FEATURE_BITMAP_FILTER_FS) > + AUDIT_FEATURE_BITMAP_FILTER_FS | \ > + AUDIT_FEATURE_BITMAP_CONTAINERID_FILTER) > > /* deprecated: AUDIT_VERSION_* */ > #define AUDIT_VERSION_LATEST AUDIT_FEATURE_BITMAP_ALL > diff --git a/kernel/audit.h b/kernel/audit.h > index 1cf1c35..743d445 100644 > --- a/kernel/audit.h > +++ b/kernel/audit.h > @@ -235,6 +235,7 @@ static inline int audit_hash_ino(u32 ino) > > extern int audit_match_class(int class, unsigned syscall); > extern int audit_comparator(const u32 left, const u32 op, const u32 right); > +extern int audit_comparator64(const u64 left, const u32 op, const u64 right); > extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); > extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); > extern int parent_len(const char *path); > diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c > index eaa3201..a5f60ce 100644 > --- a/kernel/auditfilter.c > +++ b/kernel/auditfilter.c > @@ -410,6 +410,7 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f) > /* FALL THROUGH */ > case AUDIT_ARCH: > case AUDIT_FSTYPE: > + case AUDIT_CONTID: > if (f->op != Audit_not_equal && f->op != Audit_equal) > return -EINVAL; > break; > @@ -584,6 +585,14 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, > } > entry->rule.exe = audit_mark; > break; > + case AUDIT_CONTID: > + if (f->val != sizeof(u64)) > + goto exit_free; > + str = audit_unpack_string(&bufp, &remain, f->val); > + if (IS_ERR(str)) > + goto exit_free; > + f->val64 = ((u64 *)str)[0]; > + break; > } > } > > @@ -666,6 +675,11 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule) > data->buflen += data->values[i] = > audit_pack_string(&bufp, audit_mark_path(krule->exe)); > break; > + case AUDIT_CONTID: > + data->buflen += data->values[i] = sizeof(u64); > + for (i = 0; i < sizeof(u64); i++) > + ((char *)bufp)[i] = ((char *)&f->val64)[i]; > + break; > case AUDIT_LOGINUID_SET: > if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) { > data->fields[i] = AUDIT_LOGINUID; > @@ -752,6 +766,10 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b) > if (!gid_eq(a->fields[i].gid, b->fields[i].gid)) > return 1; > break; > + case AUDIT_CONTID: > + if (a->fields[i].val64 != b->fields[i].val64) > + return 1; > + break; > default: > if (a->fields[i].val != b->fields[i].val) > return 1; > @@ -1208,6 +1226,31 @@ int audit_comparator(u32 left, u32 op, u32 right) > } > } > > +int audit_comparator64(u64 left, u32 op, u64 right) > +{ > + switch (op) { > + case Audit_equal: > + return (left == right); > + case Audit_not_equal: > + return (left != right); > + case Audit_lt: > + return (left < right); > + case Audit_le: > + return (left <= right); > + case Audit_gt: > + return (left > right); > + case Audit_ge: > + return (left >= right); > + case Audit_bitmask: > + return (left & right); > + case Audit_bittest: > + return ((left & right) == right); > + default: > + BUG(); > + return 0; > + } > +} > + > int audit_uid_comparator(kuid_t left, u32 op, kuid_t right) > { > switch (op) { > @@ -1346,6 +1389,10 @@ int audit_filter(int msgtype, unsigned int listtype) > result = audit_comparator(audit_loginuid_set(current), > f->op, f->val); > break; > + case AUDIT_CONTID: > + result = audit_comparator64(audit_get_contid(current), > + f->op, f->val64); > + break; > case AUDIT_MSGTYPE: > result = audit_comparator(msgtype, f->op, f->val); > break; > diff --git a/kernel/auditsc.c b/kernel/auditsc.c > index 81c9765..ea1ee35 100644 > --- a/kernel/auditsc.c > +++ b/kernel/auditsc.c > @@ -622,6 +622,9 @@ static int audit_filter_rules(struct task_struct *tsk, > case AUDIT_LOGINUID_SET: > result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val); > break; > + case AUDIT_CONTID: > + result = audit_comparator64(audit_get_contid(tsk), f->op, f->val64); > + break; > case AUDIT_SUBJ_USER: > case AUDIT_SUBJ_ROLE: > case AUDIT_SUBJ_TYPE: > -- > 1.8.3.1 > > -- > Linux-audit mailing list > Linux-audit@redhat.com > https://www.redhat.com/mailman/listinfo/linux-audit -- paul moore www.paul-moore.com
diff --git a/include/linux/audit.h b/include/linux/audit.h index f549121..1e37abf 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -76,6 +76,7 @@ struct audit_field { u32 type; union { u32 val; + u64 val64; kuid_t uid; kgid_t gid; struct { diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h index 469ab25..b440558 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -262,6 +262,7 @@ #define AUDIT_LOGINUID_SET 24 #define AUDIT_SESSIONID 25 /* Session ID */ #define AUDIT_FSTYPE 26 /* FileSystem Type */ +#define AUDIT_CONTID 27 /* Container ID */ /* These are ONLY useful when checking * at syscall exit time (AUDIT_AT_EXIT). */ @@ -342,6 +343,7 @@ enum { #define AUDIT_FEATURE_BITMAP_SESSIONID_FILTER 0x00000010 #define AUDIT_FEATURE_BITMAP_LOST_RESET 0x00000020 #define AUDIT_FEATURE_BITMAP_FILTER_FS 0x00000040 +#define AUDIT_FEATURE_BITMAP_CONTAINERID_FILTER 0x00000080 #define AUDIT_FEATURE_BITMAP_ALL (AUDIT_FEATURE_BITMAP_BACKLOG_LIMIT | \ AUDIT_FEATURE_BITMAP_BACKLOG_WAIT_TIME | \ @@ -349,7 +351,8 @@ enum { AUDIT_FEATURE_BITMAP_EXCLUDE_EXTEND | \ AUDIT_FEATURE_BITMAP_SESSIONID_FILTER | \ AUDIT_FEATURE_BITMAP_LOST_RESET | \ - AUDIT_FEATURE_BITMAP_FILTER_FS) + AUDIT_FEATURE_BITMAP_FILTER_FS | \ + AUDIT_FEATURE_BITMAP_CONTAINERID_FILTER) /* deprecated: AUDIT_VERSION_* */ #define AUDIT_VERSION_LATEST AUDIT_FEATURE_BITMAP_ALL diff --git a/kernel/audit.h b/kernel/audit.h index 1cf1c35..743d445 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -235,6 +235,7 @@ static inline int audit_hash_ino(u32 ino) extern int audit_match_class(int class, unsigned syscall); extern int audit_comparator(const u32 left, const u32 op, const u32 right); +extern int audit_comparator64(const u64 left, const u32 op, const u64 right); extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); extern int parent_len(const char *path); diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index eaa3201..a5f60ce 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -410,6 +410,7 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f) /* FALL THROUGH */ case AUDIT_ARCH: case AUDIT_FSTYPE: + case AUDIT_CONTID: if (f->op != Audit_not_equal && f->op != Audit_equal) return -EINVAL; break; @@ -584,6 +585,14 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, } entry->rule.exe = audit_mark; break; + case AUDIT_CONTID: + if (f->val != sizeof(u64)) + goto exit_free; + str = audit_unpack_string(&bufp, &remain, f->val); + if (IS_ERR(str)) + goto exit_free; + f->val64 = ((u64 *)str)[0]; + break; } } @@ -666,6 +675,11 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule) data->buflen += data->values[i] = audit_pack_string(&bufp, audit_mark_path(krule->exe)); break; + case AUDIT_CONTID: + data->buflen += data->values[i] = sizeof(u64); + for (i = 0; i < sizeof(u64); i++) + ((char *)bufp)[i] = ((char *)&f->val64)[i]; + break; case AUDIT_LOGINUID_SET: if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) { data->fields[i] = AUDIT_LOGINUID; @@ -752,6 +766,10 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b) if (!gid_eq(a->fields[i].gid, b->fields[i].gid)) return 1; break; + case AUDIT_CONTID: + if (a->fields[i].val64 != b->fields[i].val64) + return 1; + break; default: if (a->fields[i].val != b->fields[i].val) return 1; @@ -1208,6 +1226,31 @@ int audit_comparator(u32 left, u32 op, u32 right) } } +int audit_comparator64(u64 left, u32 op, u64 right) +{ + switch (op) { + case Audit_equal: + return (left == right); + case Audit_not_equal: + return (left != right); + case Audit_lt: + return (left < right); + case Audit_le: + return (left <= right); + case Audit_gt: + return (left > right); + case Audit_ge: + return (left >= right); + case Audit_bitmask: + return (left & right); + case Audit_bittest: + return ((left & right) == right); + default: + BUG(); + return 0; + } +} + int audit_uid_comparator(kuid_t left, u32 op, kuid_t right) { switch (op) { @@ -1346,6 +1389,10 @@ int audit_filter(int msgtype, unsigned int listtype) result = audit_comparator(audit_loginuid_set(current), f->op, f->val); break; + case AUDIT_CONTID: + result = audit_comparator64(audit_get_contid(current), + f->op, f->val64); + break; case AUDIT_MSGTYPE: result = audit_comparator(msgtype, f->op, f->val); break; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 81c9765..ea1ee35 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -622,6 +622,9 @@ static int audit_filter_rules(struct task_struct *tsk, case AUDIT_LOGINUID_SET: result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val); break; + case AUDIT_CONTID: + result = audit_comparator64(audit_get_contid(tsk), f->op, f->val64); + break; case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE:
Implement audit container identifier filtering using the AUDIT_CONTID field name to send an 8-character string representing a u64 since the value field is only u32. Sending it as two u32 was considered, but gathering and comparing two fields was more complex. The feature indicator is AUDIT_FEATURE_BITMAP_CONTAINERID_FILTER. See: https://github.com/linux-audit/audit-kernel/issues/91 See: https://github.com/linux-audit/audit-userspace/issues/40 See: https://github.com/linux-audit/audit-testsuite/issues/64 See: https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID Signed-off-by: Richard Guy Briggs <rgb@redhat.com> --- include/linux/audit.h | 1 + include/uapi/linux/audit.h | 5 ++++- kernel/audit.h | 1 + kernel/auditfilter.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++ kernel/auditsc.c | 3 +++ 5 files changed, 56 insertions(+), 1 deletion(-)