From patchwork Fri Jun 21 18:52:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 11010591 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A574514BB for ; Fri, 21 Jun 2019 18:53:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 94B2D28B18 for ; Fri, 21 Jun 2019 18:53:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 88DF528B27; Fri, 21 Jun 2019 18:53:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 228DD28B18 for ; Fri, 21 Jun 2019 18:52:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726311AbfFUSw5 (ORCPT ); Fri, 21 Jun 2019 14:52:57 -0400 Received: from sonic303-28.consmr.mail.ne1.yahoo.com ([66.163.188.154]:42639 "EHLO sonic303-28.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726328AbfFUSw5 (ORCPT ); Fri, 21 Jun 2019 14:52:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1561143175; bh=QQr6277NNTk+shhaSXX7c1Ju3QymsecVJb9B5LUqFj8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject; b=M813M2YQZJ+0JFisOHww2hSGgG5Y0qUdZT1hhoaZGEB5EvjY/OOuuszO6BNHslLRorkHxAryQmx3kkWmiPZQESmnyTPblrt8Tx2oUiYxxavKaZkeIsgNUwyK9ory3eye0aGJ7jCo52u0Mz1XT7+uvfRianiUMsOhN7imA+z2+RBaHpLJ5FE+CkgljbBKo46P55ECQnJxqNddT4WjTrZ33y8obP8yOrX/yQMdnUsdPQcuL+hrKkRdTTLI1BL7NT6Mf3FJ1RvTahA7gYyxyC/bZh37iDhSK/iXsWCM3RJQ1jBmUJXbxSrn3n5v8dj7qbfatln8UyYlV3SFlWDWPSPqOQ== X-YMail-OSG: oBuGAB8VM1lrsDAGM_u0Fx1arVcW7sbkK4uFz7gFcOo_JaaogEE5YQjqsf6_Hq. 7rocCX2.RN81LL_tdq6epTqsB.3nDDlf1Njic5nW0yEwZBSnFlJ5dIdbMhwip3uMoL.PtAl8qlRi hktZdxGM.JuKvKisDcSItnC9twWX1d1HRIf.SK4wH2SVko9H.YKKCF2DxQOm8qwRrLBAx5BYVnoD I2RkdTzLZYGg2jX1iTxo57s3H471bXq3SMaYU60dXyOeq_hsF1zYC4g6ynV._EVpzqZ6pEUUj7it jV_z.2lOQGnToCWrqyTSZWPzbWrBKKqWeQNSGD.W8VVh2GoTN1SzwOJeZL_HTKohuaiHxWLZ8X2G glACTCADa8Aaejs2_i6suktw2Qoxvoo6IAbcQenCg3qvHou7Qzm7oyo56B9sB1TS1k8M49HQSdPB P1_UBIZAY.4BkMByRaiojh0ge5pEDIWec.dcwe8H_K0cJZOrod1dn0s9Mc6mMf56.QbEd6aZz0fU g7Sz7TaceKWIQuOGgLU.Md83ZW6Snf.DLY.GE8r8q7p0p6A5FwKEdrcCAgZMpkJUGJ3mC9tsJsrA LrgQCpOMdbkxUeD649sbbY4KpZJQ5YWy08iWfFeFQQSdTcugVD_xH5T_nv.n5sx3wF4LnmOb1lyX L0rgdf81IL9e.tQHw.ZNY7Iq1JAjBxOpwuiK1RkTQEjtdhp9oRKTjO943BFcPsADJOpZd8kA3qte th6aKboL2C04g9qWzdRxFT65MCQNqB4CKHDWG9sMTrJc1rPWmO.BxpPZH1m5O8wndYlevFAXQ4i_ DDWNY8.r1I1Mq2g1pScWoW0xhZue9wSArhP9kFl8a4L5CQVaOt9GnqIIKld54S07uGMVllZljeUP YNlXcx3QZLHMQ3Sa.1Uykb6Yq2r15yJGehBFCSg7A57cjOJmJTbIqm7bLs2xL9AWBN4L9ozFYKdr dVxV8y4YZgbAei4Hrnhn6hjKFJve0KnYRC_FifcHbejZQZuI6xsORKbpii7MWvB7XWn2e2oVdOnc kGhYzKJE25Xs0zvKk4nS_3jUFSMpwB7M3db3mWWqF637sHV_XkSgiFtqUeEZ6pnY7augK36cyh_c 3EFdbWSUSG45qd1n..D5LomKpozAKH7yVpdfy.dIjH3OfWWOMM3_S3xgqCh7rKsTyIxY_GiAbh8g x8xjszLs2QTJI4UNsBnzr_k1aY3kymzBGzRNFHi6DvT4hyUraNUp7abujAOKT0vcExFsYuragBOy MLsgcjBXQ6JHs1vV4EhHfIFAuZyjxltjRYhvPHyU- Received: from sonic.gate.mail.ne1.yahoo.com by sonic303.consmr.mail.ne1.yahoo.com with HTTP; Fri, 21 Jun 2019 18:52:55 +0000 Received: from c-73-223-4-185.hsd1.ca.comcast.net (EHLO localhost.net) ([73.223.4.185]) by smtp416.mail.ne1.yahoo.com (Oath Hermes SMTP Server) with ESMTPA ID 1d10864c45a2fe45d2b5b4a73ef7e245; Fri, 21 Jun 2019 18:52:54 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov Subject: [PATCH v3 09/24] LSM: Use lsmblob in security_secid_to_secctx Date: Fri, 21 Jun 2019 11:52:18 -0700 Message-Id: <20190621185233.6766-10-casey@schaufler-ca.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190621185233.6766-1-casey@schaufler-ca.com> References: <20190621185233.6766-1-casey@schaufler-ca.com> MIME-Version: 1.0 Sender: selinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Change security_secid_to_secctx() to take a lsmblob as input instead of a u32 secid. It will then call the LSM hooks using the lsmblob element allocated for that module. The callers have been updated as well. This allows for the possibility that more than one module may called upon to translate a secid to a string, as can occur in the audit code. Signed-off-by: Casey Schaufler Reviewed-by: Kees Cook Reviewed-by: John Johansen --- drivers/android/binder.c | 4 +++- include/linux/security.h | 5 +++-- include/net/scm.h | 5 ++--- kernel/audit.c | 9 +++++++-- kernel/auditsc.c | 14 ++++++++++---- net/ipv4/ip_sockglue.c | 3 +-- net/netfilter/nf_conntrack_netlink.c | 8 ++++++-- net/netfilter/nf_conntrack_standalone.c | 4 +++- net/netfilter/nfnetlink_queue.c | 8 ++++++-- net/netlabel/netlabel_unlabeled.c | 18 ++++++++++++++---- net/netlabel/netlabel_user.c | 6 +++--- security/security.c | 14 +++++++++++--- 12 files changed, 69 insertions(+), 29 deletions(-) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 8685882da64c..1962f6b8abd0 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3120,9 +3120,11 @@ static void binder_transaction(struct binder_proc *proc, if (target_node && target_node->txn_security_ctx) { u32 secid; + struct lsmblob blob; security_task_getsecid(proc->tsk, &secid); - ret = security_secid_to_secctx(secid, &secctx, &secctx_sz); + lsmblob_init(&blob, secid); + ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz); if (ret) { return_error = BR_FAILED_REPLY; return_error_param = ret; diff --git a/include/linux/security.h b/include/linux/security.h index b0395d224c43..c6cddeff8a17 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -442,7 +442,7 @@ 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(u32 secid, char **secdata, u32 *seclen); +int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen); int security_secctx_to_secid(const char *secdata, u32 seclen, struct lsmblob *blob); void security_release_secctx(char *secdata, u32 seclen); @@ -1220,7 +1220,8 @@ static inline int security_ismaclabel(const char *name) return 0; } -static inline int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) +static inline int security_secid_to_secctx(struct lsmblob *blob, + char **secdata, u32 *seclen) { return -EOPNOTSUPP; } diff --git a/include/net/scm.h b/include/net/scm.h index e2e71c4bf9d0..31ae605fcc0a 100644 --- a/include/net/scm.h +++ b/include/net/scm.h @@ -97,9 +97,8 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc int err; if (test_bit(SOCK_PASSSEC, &sock->flags)) { - /* Scaffolding - it has to be element 0 for now */ - err = security_secid_to_secctx(scm->lsmblob.secid[0], - &secdata, &seclen); + err = security_secid_to_secctx(&scm->lsmblob, &secdata, + &seclen); if (!err) { put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); diff --git a/kernel/audit.c b/kernel/audit.c index c89ea48c70a6..d0338411d75d 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1430,7 +1430,10 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) case AUDIT_SIGNAL_INFO: len = 0; if (audit_sig_sid) { - err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); + struct lsmblob blob; + + lsmblob_init(&blob, audit_sig_sid); + err = security_secid_to_secctx(&blob, &ctx, &len); if (err) return err; } @@ -2073,12 +2076,14 @@ int audit_log_task_context(struct audit_buffer *ab) unsigned len; int error; u32 sid; + struct lsmblob blob; security_task_getsecid(current, &sid); if (!sid) return 0; - error = security_secid_to_secctx(sid, &ctx, &len); + lsmblob_init(&blob, sid); + error = security_secid_to_secctx(&blob, &ctx, &len); if (error) { if (error != -EINVAL) goto error_path; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 18ee5556c086..d31914088a82 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -947,6 +947,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid, char *ctx = NULL; u32 len; int rc = 0; + struct lsmblob blob; ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); if (!ab) @@ -956,7 +957,8 @@ 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 (sid) { - if (security_secid_to_secctx(sid, &ctx, &len)) { + lsmblob_init(&blob, sid); + if (security_secid_to_secctx(&blob, &ctx, &len)) { audit_log_format(ab, " obj=(none)"); rc = 1; } else { @@ -1198,7 +1200,10 @@ static void show_special(struct audit_context *context, int *call_panic) if (osid) { char *ctx = NULL; u32 len; - if (security_secid_to_secctx(osid, &ctx, &len)) { + struct lsmblob blob; + + lsmblob_init(&blob, osid); + if (security_secid_to_secctx(&blob, &ctx, &len)) { audit_log_format(ab, " osid=%u", osid); *call_panic = 1; } else { @@ -1349,9 +1354,10 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n, if (n->osid != 0) { char *ctx = NULL; u32 len; + struct lsmblob blob; - if (security_secid_to_secctx( - n->osid, &ctx, &len)) { + lsmblob_init(&blob, n->osid); + if (security_secid_to_secctx(&blob, &ctx, &len)) { 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 2a5c868ce135..e05f4ef68bd8 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -139,8 +139,7 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) if (err) return; - /* Scaffolding - it has to be element 0 */ - err = security_secid_to_secctx(lb.secid[0], &secdata, &seclen); + err = security_secid_to_secctx(&lb, &secdata, &seclen); if (err) return; diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index 66c596d287a5..ca0968f13240 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -330,8 +330,10 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) struct nlattr *nest_secctx; int len, ret; char *secctx; + struct lsmblob blob; - ret = security_secid_to_secctx(ct->secmark, &secctx, &len); + lsmblob_init(&blob, ct->secmark); + ret = security_secid_to_secctx(&blob, &secctx, &len); if (ret) return 0; @@ -615,8 +617,10 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct) { #ifdef CONFIG_NF_CONNTRACK_SECMARK int len, ret; + struct lsmblob blob; - ret = security_secid_to_secctx(ct->secmark, NULL, &len); + lsmblob_init(&blob, ct->secmark); + ret = security_secid_to_secctx(&blob, NULL, &len); if (ret) return 0; diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c index c2ae14c720b4..c793103f3cd7 100644 --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -175,8 +175,10 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) int ret; u32 len; char *secctx; + struct lsmblob blob; - ret = security_secid_to_secctx(ct->secmark, &secctx, &len); + lsmblob_init(&blob, ct->secmark); + ret = security_secid_to_secctx(&blob, &secctx, &len); if (ret) return; diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index 0dcc3592d053..59211bff90ab 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -309,13 +309,17 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) { u32 seclen = 0; #if IS_ENABLED(CONFIG_NETWORK_SECMARK) + struct lsmblob blob; + if (!skb || !sk_fullsock(skb->sk)) return 0; read_lock_bh(&skb->sk->sk_callback_lock); - if (skb->secmark) - security_secid_to_secctx(skb->secmark, secdata, &seclen); + if (skb->secmark) { + lsmblob_init(&blob, skb->secmark); + security_secid_to_secctx(&blob, secdata, &seclen); + } read_unlock_bh(&skb->sk->sk_callback_lock); #endif diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c index 2976370e41aa..2d8dd5b84457 100644 --- a/net/netlabel/netlabel_unlabeled.c +++ b/net/netlabel/netlabel_unlabeled.c @@ -389,6 +389,7 @@ int netlbl_unlhsh_add(struct net *net, struct audit_buffer *audit_buf = NULL; char *secctx = NULL; u32 secctx_len; + struct lsmblob blob; if (addr_len != sizeof(struct in_addr) && addr_len != sizeof(struct in6_addr)) @@ -451,7 +452,8 @@ int netlbl_unlhsh_add(struct net *net, unlhsh_add_return: rcu_read_unlock(); if (audit_buf != NULL) { - if (security_secid_to_secctx(secid, + lsmblob_init(&blob, secid); + if (security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " sec_obj=%s", secctx); @@ -488,6 +490,7 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, struct net_device *dev; char *secctx; u32 secctx_len; + struct lsmblob blob; spin_lock(&netlbl_unlhsh_lock); list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, @@ -507,8 +510,10 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, addr->s_addr, mask->s_addr); if (dev != NULL) dev_put(dev); + if (entry != NULL) + lsmblob_init(&blob, entry->secid); if (entry != NULL && - security_secid_to_secctx(entry->secid, + security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " sec_obj=%s", secctx); security_release_secctx(secctx, secctx_len); @@ -550,6 +555,7 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, struct net_device *dev; char *secctx; u32 secctx_len; + struct lsmblob blob; spin_lock(&netlbl_unlhsh_lock); list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); @@ -568,8 +574,10 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, addr, mask); if (dev != NULL) dev_put(dev); + if (entry != NULL) + lsmblob_init(&blob, entry->secid); if (entry != NULL && - security_secid_to_secctx(entry->secid, + security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " sec_obj=%s", secctx); security_release_secctx(secctx, secctx_len); @@ -1090,6 +1098,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, u32 secid; char *secctx; u32 secctx_len; + struct lsmblob blob; data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid, cb_arg->seq, &netlbl_unlabel_gnl_family, @@ -1144,7 +1153,8 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, secid = addr6->secid; } - ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); + lsmblob_init(&blob, secid); + ret_val = security_secid_to_secctx(&blob, &secctx, &secctx_len); 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 4676f5bb16ae..2ccc6567e2a2 100644 --- a/net/netlabel/netlabel_user.c +++ b/net/netlabel/netlabel_user.c @@ -100,6 +100,7 @@ struct audit_buffer *netlbl_audit_start_common(int type, struct audit_buffer *audit_buf; char *secctx; u32 secctx_len; + struct lsmblob blob; if (audit_enabled == AUDIT_OFF) return NULL; @@ -112,10 +113,9 @@ struct audit_buffer *netlbl_audit_start_common(int type, from_kuid(&init_user_ns, audit_info->loginuid), audit_info->sessionid); + lsmblob_init(&blob, audit_info->secid); if (audit_info->secid != 0 && - security_secid_to_secctx(audit_info->secid, - &secctx, - &secctx_len) == 0) { + security_secid_to_secctx(&blob, &secctx, &secctx_len) == 0) { audit_log_format(audit_buf, " subj=%s", secctx); security_release_secctx(secctx, secctx_len); } diff --git a/security/security.c b/security/security.c index cb1545bfe8c5..5ab07631df75 100644 --- a/security/security.c +++ b/security/security.c @@ -1992,10 +1992,18 @@ int security_ismaclabel(const char *name) } EXPORT_SYMBOL(security_ismaclabel); -int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) +int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen) { - return call_int_hook(secid_to_secctx, -EOPNOTSUPP, secid, secdata, - seclen); + struct security_hook_list *hp; + int rc; + + hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) { + rc = hp->hook.secid_to_secctx(blob->secid[hp->slot], + secdata, seclen); + if (rc != 0) + return rc; + } + return 0; } EXPORT_SYMBOL(security_secid_to_secctx);