From f3f8771420737004da55159c2f2dc0b6f483a4ef Mon Sep 17 00:00:00 2001 From: Darrel Goeddel Date: Mon, 25 Sep 2006 23:31:59 -0700 Subject: [PATCH] selinux: add support for range transitions on object classes Introduces support for policy version 21. This version of the binary kernel policy allows for defining range transitions on security classes other than the process security class. As always, backwards compatibility for older formats is retained. The security class is read in as specified when using the new format, while the "process" security class is assumed when using an older policy format. Signed-off-by: Darrel Goeddel Signed-off-by: Stephen Smalley Acked-by: James Morris Acked-by: Eric Paris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- security/selinux/ss/mls.c | 21 ++++++++++----------- security/selinux/ss/policydb.c | 27 ++++++++++++++++++++------- security/selinux/ss/policydb.h | 7 ++++--- 3 files changed, 34 insertions(+), 21 deletions(-) (limited to 'security/selinux/ss') diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c index 119bd60..c713af2 100644 --- a/security/selinux/ss/mls.c +++ b/security/selinux/ss/mls.c @@ -530,22 +530,21 @@ int mls_compute_sid(struct context *scontext, u32 specified, struct context *newcontext) { + struct range_trans *rtr; + if (!selinux_mls_enabled) return 0; switch (specified) { case AVTAB_TRANSITION: - if (tclass == SECCLASS_PROCESS) { - struct range_trans *rangetr; - /* Look for a range transition rule. */ - for (rangetr = policydb.range_tr; rangetr; - rangetr = rangetr->next) { - if (rangetr->dom == scontext->type && - rangetr->type == tcontext->type) { - /* Set the range from the rule */ - return mls_range_set(newcontext, - &rangetr->range); - } + /* Look for a range transition rule. */ + for (rtr = policydb.range_tr; rtr; rtr = rtr->next) { + if (rtr->source_type == scontext->type && + rtr->target_type == tcontext->type && + rtr->target_class == tclass) { + /* Set the range from the rule */ + return mls_range_set(newcontext, + &rtr->target_range); } } /* Fallthrough */ diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index f03960e..b188953 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -96,6 +96,11 @@ static struct policydb_compat_info policydb_compat[] = { .sym_num = SYM_NUM, .ocon_num = OCON_NUM, }, + { + .version = POLICYDB_VERSION_RANGETRANS, + .sym_num = SYM_NUM, + .ocon_num = OCON_NUM, + }, }; static struct policydb_compat_info *policydb_lookup_compat(int version) @@ -645,15 +650,15 @@ void policydb_destroy(struct policydb *p) for (rt = p->range_tr; rt; rt = rt -> next) { if (lrt) { - ebitmap_destroy(&lrt->range.level[0].cat); - ebitmap_destroy(&lrt->range.level[1].cat); + ebitmap_destroy(&lrt->target_range.level[0].cat); + ebitmap_destroy(&lrt->target_range.level[1].cat); kfree(lrt); } lrt = rt; } if (lrt) { - ebitmap_destroy(&lrt->range.level[0].cat); - ebitmap_destroy(&lrt->range.level[1].cat); + ebitmap_destroy(&lrt->target_range.level[0].cat); + ebitmap_destroy(&lrt->target_range.level[1].cat); kfree(lrt); } @@ -1829,6 +1834,7 @@ int policydb_read(struct policydb *p, void *fp) } if (p->policyvers >= POLICYDB_VERSION_MLS) { + int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS; rc = next_entry(buf, fp, sizeof(u32)); if (rc < 0) goto bad; @@ -1847,9 +1853,16 @@ int policydb_read(struct policydb *p, void *fp) rc = next_entry(buf, fp, (sizeof(u32) * 2)); if (rc < 0) goto bad; - rt->dom = le32_to_cpu(buf[0]); - rt->type = le32_to_cpu(buf[1]); - rc = mls_read_range_helper(&rt->range, fp); + rt->source_type = le32_to_cpu(buf[0]); + rt->target_type = le32_to_cpu(buf[1]); + if (new_rangetr) { + rc = next_entry(buf, fp, sizeof(u32)); + if (rc < 0) + goto bad; + rt->target_class = le32_to_cpu(buf[0]); + } else + rt->target_class = SECCLASS_PROCESS; + rc = mls_read_range_helper(&rt->target_range, fp); if (rc) goto bad; lrt = rt; diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h index b134071..8319d5f 100644 --- a/security/selinux/ss/policydb.h +++ b/security/selinux/ss/policydb.h @@ -106,9 +106,10 @@ struct cat_datum { }; struct range_trans { - u32 dom; /* current process domain */ - u32 type; /* program executable type */ - struct mls_range range; /* new range */ + u32 source_type; + u32 target_type; + u32 target_class; + struct mls_range target_range; struct range_trans *next; }; -- cgit v1.1