[v37,22/33] LSM: security_secid_to_secctx module selection

Message ID	20220628005611.13106-23-casey@schaufler-ca.com (mailing list archive)
State	Handled Elsewhere
Delegated to:	Paul Moore
Headers	show Return-Path: <selinux-owner@kernel.org> From: Casey Schaufler <casey@schaufler-ca.com> To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, linux-audit@redhat.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org Subject: [PATCH v37 22/33] LSM: security_secid_to_secctx module selection Date: Mon, 27 Jun 2022 17:56:00 -0700 Message-Id: <20220628005611.13106-23-casey@schaufler-ca.com> In-Reply-To: <20220628005611.13106-1-casey@schaufler-ca.com> References: <20220628005611.13106-1-casey@schaufler-ca.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	[v37,01/33] integrity: disassociate ima_filter_rule from security_audit_rule \| expand [v37,01/33] integrity: disassociate ima_filter_rule from security_audit_rule [v37,02/33] LSM: Infrastructure management of the sock security [v37,03/33] LSM: Add the lsmblob data structure. [v37,04/33] LSM: provide lsm name and id slot mappings [v37,05/33] IMA: avoid label collisions with stacked LSMs [v37,06/33] LSM: Use lsmblob in security_audit_rule_match [v37,07/33] LSM: Use lsmblob in security_kernel_act_as [v37,08/33] LSM: Use lsmblob in security_secctx_to_secid [v37,09/33] LSM: Use lsmblob in security_secid_to_secctx [v37,10/33] LSM: Use lsmblob in security_ipc_getsecid [v37,11/33] LSM: Use lsmblob in security_current_getsecid [v37,12/33] LSM: Use lsmblob in security_inode_getsecid [v37,13/33] LSM: Use lsmblob in security_cred_getsecid [v37,14/33] LSM: Specify which LSM to display [v37,15/33] LSM: Ensure the correct LSM context releaser [v37,16/33] LSM: Use lsmcontext in security_secid_to_secctx [v37,17/33] LSM: Use lsmcontext in security_inode_getsecctx [v37,18/33] LSM: Use lsmcontext in security_dentry_init_security [v37,19/33] LSM: security_secid_to_secctx in netlink netfilter [v37,20/33] NET: Store LSM netlabel data in a lsmblob [v37,21/33] binder: Pass LSM identifier for confirmation [v37,22/33] LSM: security_secid_to_secctx module selection [v37,23/33] Audit: Keep multiple LSM data in audit_names [v37,24/33] Audit: Create audit_stamp structure [v37,25/33] LSM: Add a function to report multiple LSMs [v37,26/33] Audit: Allow multiple records in an audit_buffer [v37,27/33] Audit: Add record for multiple task security contexts [v37,28/33] audit: multiple subject lsm values for netlabel [v37,29/33] Audit: Add record for multiple object contexts [v37,30/33] netlabel: Use a struct lsmblob in audit data [v37,31/33] LSM: Removed scaffolding function lsmcontext_init [v37,32/33] LSM: Add /proc attr entry for full LSM context [v37,33/33] AppArmor: Remove the exclusive flag

diff --git a/drivers/android/binder.c b/drivers/android/binder.c index f2a0faf6d9c6..06c9263108a8 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3057,7 +3057,7 @@ static void binder_transaction(struct binder_proc *proc, size_t added_size; security_cred_getsecid(proc->cred, &blob); - ret = security_secid_to_secctx(&blob, &lsmctx); + ret = security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_DISPLAY); if (ret) { binder_txn_error("%d:%d failed to get security context\n", thread->pid, proc->pid); diff --git a/include/linux/security.h b/include/linux/security.h index a4d08b47cbc3..5ebc3ec6948c 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -186,6 +186,8 @@ struct lsmblob { #define LSMBLOB_INVALID -1 /* Not a valid LSM slot number */ #define LSMBLOB_NEEDED -2 /* Slot requested on initialization */ #define LSMBLOB_NOT_NEEDED -3 /* Slot not requested */ +#define LSMBLOB_DISPLAY -4 /* Use the "interface_lsm" slot */ +#define LSMBLOB_FIRST -5 /* Use the first slot */ /** * lsmblob_init - initialize a lsmblob structure @@ -628,7 +630,8 @@ int security_setprocattr(const char *lsm, const char *name, void *value, size_t size); int security_netlink_send(struct sock *sk, struct sk_buff *skb); int security_ismaclabel(const char *name); -int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp); +int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp, + int ilsm); int security_secctx_to_secid(const char *secdata, u32 seclen, struct lsmblob *blob); void security_release_secctx(struct lsmcontext *cp); @@ -1482,7 +1485,7 @@ static inline int security_ismaclabel(const char *name) } static inline int security_secid_to_secctx(struct lsmblob *blob, - struct lsmcontext *cp) + struct lsmcontext *cp, int ilsm) { return -EOPNOTSUPP; } diff --git a/include/net/scm.h b/include/net/scm.h index b77a52f93389..f4d567d4885e 100644 --- a/include/net/scm.h +++ b/include/net/scm.h @@ -101,7 +101,7 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc * and the infrastructure will know which it is. */ lsmblob_init(&lb, scm->secid); - err = security_secid_to_secctx(&lb, &context); + err = security_secid_to_secctx(&lb, &context, LSMBLOB_DISPLAY); if (!err) { put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, context.len, diff --git a/kernel/audit.c b/kernel/audit.c index 6500d97ce9ad..99439dcc75fc 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1464,7 +1464,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) if (lsmblob_is_set(&audit_sig_lsm)) { err = security_secid_to_secctx(&audit_sig_lsm, - &context); + &context, LSMBLOB_FIRST); if (err) return err; } @@ -2176,7 +2176,7 @@ int audit_log_task_context(struct audit_buffer *ab) if (!lsmblob_is_set(&blob)) return 0; - error = security_secid_to_secctx(&blob, &context); + error = security_secid_to_secctx(&blob, &context, LSMBLOB_FIRST); if (error) { if (error != -EINVAL) diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 25a6c2a5b4b3..318529b1f930 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1132,7 +1132,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid, from_kuid(&init_user_ns, auid), from_kuid(&init_user_ns, uid), sessionid); if (lsmblob_is_set(blob)) { - if (security_secid_to_secctx(blob, &lsmctx)) { + if (security_secid_to_secctx(blob, &lsmctx, LSMBLOB_FIRST)) { audit_log_format(ab, " obj=(none)"); rc = 1; } else { @@ -1425,7 +1425,8 @@ static void show_special(struct audit_context *context, int *call_panic) struct lsmblob blob; lsmblob_init(&blob, osid); - if (security_secid_to_secctx(&blob, &lsmcxt)) { + if (security_secid_to_secctx(&blob, &lsmcxt, + LSMBLOB_FIRST)) { audit_log_format(ab, " osid=%u", osid); *call_panic = 1; } else { @@ -1593,7 +1594,7 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n, struct lsmcontext lsmctx; lsmblob_init(&blob, n->osid); - if (security_secid_to_secctx(&blob, &lsmctx)) { + if (security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_FIRST)) { audit_log_format(ab, " osid=%u", n->osid); if (call_panic) *call_panic = 2; diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index ad5be7707bca..9b5c44dec1e9 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -140,7 +140,7 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) return; lsmblob_init(&lb, secid); - err = security_secid_to_secctx(&lb, &context); + err = security_secid_to_secctx(&lb, &context, LSMBLOB_DISPLAY); if (err) return; diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index 8bd6ce5f9e93..14d0d4f705eb 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -353,7 +353,7 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) * security_secid_to_secctx() will know which security module * to use to create the secctx. */ lsmblob_init(&blob, ct->secmark); - ret = security_secid_to_secctx(&blob, &context); + ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY); if (ret) return 0; @@ -663,7 +663,7 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct) int len; struct lsmblob blob; - len = security_secid_to_secctx(&blob, NULL); + len = security_secid_to_secctx(&blob, NULL, LSMBLOB_DISPLAY); if (len <= 0) return 0; diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c index 5003acf79794..8921e269c381 100644 --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -180,7 +180,7 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) struct lsmcontext context; lsmblob_init(&blob, ct->secmark); - ret = security_secid_to_secctx(&blob, &context); + ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY); if (ret) return; diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index f60a0b6240ff..844955b2e163 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -316,7 +316,7 @@ static void nfqnl_get_sk_secctx(struct sk_buff *skb, struct lsmcontext *context) * blob. security_secid_to_secctx() will know which security * module to use to create the secctx. */ lsmblob_init(&blob, skb->secmark); - security_secid_to_secctx(&blob, context); + security_secid_to_secctx(&blob, context, LSMBLOB_DISPLAY); } read_unlock_bh(&skb->sk->sk_callback_lock); diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c index 910a03f15b0d..8deee7e176a9 100644 --- a/net/netlabel/netlabel_unlabeled.c +++ b/net/netlabel/netlabel_unlabeled.c @@ -437,7 +437,8 @@ int netlbl_unlhsh_add(struct net *net, unlhsh_add_return: rcu_read_unlock(); if (audit_buf != NULL) { - if (security_secid_to_secctx(lsmblob, &context) == 0) { + if (security_secid_to_secctx(lsmblob, &context, + LSMBLOB_FIRST) == 0) { audit_log_format(audit_buf, " sec_obj=%s", context.context); security_release_secctx(&context); @@ -491,7 +492,8 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, addr->s_addr, mask->s_addr); dev_put(dev); if (entry != NULL && - security_secid_to_secctx(&entry->lsmblob, &context) == 0) { + security_secid_to_secctx(&entry->lsmblob, &context, + LSMBLOB_FIRST) == 0) { audit_log_format(audit_buf, " sec_obj=%s", context.context); security_release_secctx(&context); @@ -550,7 +552,8 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, addr, mask); dev_put(dev); if (entry != NULL && - security_secid_to_secctx(&entry->lsmblob, &context) == 0) { + security_secid_to_secctx(&entry->lsmblob, &context, + LSMBLOB_FIRST) == 0) { audit_log_format(audit_buf, " sec_obj=%s", context.context); security_release_secctx(&context); @@ -1120,7 +1123,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, lsmb = (struct lsmblob *)&addr6->lsmblob; } - ret_val = security_secid_to_secctx(lsmb, &context); + ret_val = security_secid_to_secctx(lsmb, &context, LSMBLOB_FIRST); if (ret_val != 0) goto list_cb_failure; ret_val = nla_put(cb_arg->skb, diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c index 951ba0639d20..1941877fd16f 100644 --- a/net/netlabel/netlabel_user.c +++ b/net/netlabel/netlabel_user.c @@ -100,7 +100,7 @@ struct audit_buffer *netlbl_audit_start_common(int type, lsmblob_init(&blob, audit_info->secid); if (audit_info->secid != 0 && - security_secid_to_secctx(&blob, &context) == 0) { + security_secid_to_secctx(&blob, &context, LSMBLOB_FIRST) == 0) { audit_log_format(audit_buf, " subj=%s", context.context); security_release_secctx(&context); } diff --git a/security/security.c b/security/security.c index 96a89fd5802b..a9a56be58e73 100644 --- a/security/security.c +++ b/security/security.c @@ -2353,20 +2353,36 @@ EXPORT_SYMBOL(security_ismaclabel); * security_secid_to_secctx - convert secid to secctx * @blob: set of secids * @cp: lsm context into which result is put + * @ilsm: which security module to report * * Translate secid information into a secctx string. * Return a negative value on error. * If cp is NULL return the length of the string. * Otherwise, return 0. */ -int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp) +int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp, + int ilsm) { struct security_hook_list *hp; - int ilsm = lsm_task_ilsm(current); if (cp) memset(cp, 0, sizeof(*cp)); + /* + * ilsm either is the slot number use for formatting + * or an instruction on which relative slot to use. + */ + if (ilsm == LSMBLOB_DISPLAY) + ilsm = lsm_task_ilsm(current); + else if (ilsm == LSMBLOB_FIRST) + ilsm = LSMBLOB_INVALID; + else if (ilsm < 0) { + WARN_ONCE(true, "LSM: %s unknown interface LSM\n", __func__); + ilsm = LSMBLOB_INVALID; + } else if (ilsm >= lsm_slot) { + WARN_ONCE(true, "LSM: %s invalid interface LSM\n", __func__); + ilsm = LSMBLOB_INVALID; + } hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) { if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) continue;

[v37,22/33] LSM: security_secid_to_secctx module selection

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