From patchwork Mon Dec 16 22:36:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 11296163 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 13CE5112B for ; Mon, 16 Dec 2019 22:38:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DBA1121835 for ; Mon, 16 Dec 2019 22:38:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=yahoo.com header.i=@yahoo.com header.b="fam9OwUz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727876AbfLPWi0 (ORCPT ); Mon, 16 Dec 2019 17:38:26 -0500 Received: from sonic306-28.consmr.mail.ne1.yahoo.com ([66.163.189.90]:43723 "EHLO sonic306-28.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727866AbfLPWi0 (ORCPT ); Mon, 16 Dec 2019 17:38:26 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1576535904; bh=AqABZKrHoJ2O/YxWBBlyrWT0dGVssWeBH837HbXrHjo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject; b=fam9OwUzaNvMcgF1Nokg58E4KBQQX8hiXlQ0gpFeLwrQ2jwH28ESrr3ud6ghTvB5b4QO16tJwmVAXJ1hL9YTYY8ohZgMjX1uN3CqZs/GJuaBihn/5Swt0VBUrelA7IoHxphS8n25f7E5TJ6mty6NZ3fyxmuII9KrnQOLGAJx50p2nSYuEeXoL/+n9EZ+7Crt0F4XGOAglElHphmz5rf1A7T8uq4mI15CFmYRQa/xYsaGY3PJ24Nx+VKK1UXjI4rUA5pK4jy9qQ4rr5SJa8MNbgsjlM226u414xwf7C3ZpBX8FcmCT8O3OQHIAPR8KDgL7+bPYTYXPizZUNA6nX5I4w== X-YMail-OSG: H50dCtEVM1mItH4NRPva5huSUQwwg1oJhtQC8WKhDMCSRoUaS29rLJlL7Sh7ZIU 3HOGC3Wms5Qzj1Q5McMH4fl1b6TVtqUwdNbPacLnqbww54ovJZRILqSkWTC9QMu6zYDzg1fq0oGU 3CzE_3jHvjzv2lMDvegq8nU7iwN7.MwI2ZpWBuEgxltZBbUwHeTEu0e7VwhP_3rS0yUKiABRJUxN dhQZS8Zg294gW1s1a9VN1lOZynwJrD8izi2GCcwe03.dCLxJRvGaEK3ssROv6Nvr0u9hCqbDd9hz be5BbBBwb_m0fnd2sSwjGcIr8A_GeYIu7uKPo6sFqlihcon7lvrHhc3tsC72HP61_ryDZ4xppY9V jQeEQBEffra.X1NSU1J7PXmXZLmZZoBzEGwnF8NNnxjORlTNYG3xgSifDUJJqpG_eNgOrdFFLAxL wRZG8IKSBvasqw.RrUVMoYzRwjV38TXhQEQCM0llNDuZICNoRpwB5aVv0SZ4b08x875Cy0yYeley ssVL_NUJNh5uoSsmyb.n3vxNHYOb3qKZI9gRYjxGQSmWYizLHhXBafqmVzx0JiUBEE0ZZsc7fQ1M AIzU5MjqN0k.2LHGe3TxuFLizM.9Al6H.r9ZqwmyizxLMBxM5Atl3ioWOzuzh6OCqR8VE0gpAFRH SyhiFl8Zg9C0uLsXSYJ1v08PSjPvI_N61IwY2Pdcq_Igvf5DEFqYxfdihmqMwJDPIxKN2.FmZ2.d o7havt819rbCujAizbngI5sT7r5qnxvpXUXNuDpOWhPak8f_BOQF2PwNvE2FQNOogwpbzhYLj3xA vZtmla003ftAcw7ZSSIeP78MeG3UPm0DpVe2GlaVEYFf4tlmLyoh0x1JTz_kLnkT3jxouaB95mdZ VPFKC_FDyj6rXTPQdLPLXevfOMami4G1RVeoWae0_gjwwQh04TBg7v8jkQH8aKdpVX57wkRwNyak oUiuBdtr3sye.J1cURzI.q2NeqNlupiHTT765szms.HLxuUQ60GMTHUbdLws99LrtWdIHcGFv32u JhZbZV0c3YaIPABtH1fx5wdcnvMXfBFjqcOsN1M40GW7hbPQjMZgXv.vf9A0garycUp0f6QBzhxE g77noYAZNUQtsrBDk9w_yBJxQJpeXav5AQEquZgG0ckLjle1HJYTaiLzf4XXzI6CpU4VnfGsY1Ck 7ulqc3YXrIZwnVdsNLGk5o96q.v7xpfWNohdqeuhr.VjbTC0WM1G35.0gNNni.H35lnQLIICC.XN seE.JxAHmsT9kEarkGnA9W8D.fm_z7ZWMn8sxrBbhsloZzzYT6Vt0wqke7xTQnx3D15XdEKtRdD2 FNOIFDeZpNqfQ0JYIjLKuMIELIQyXdoiPpyFaDWXGQYaMXb._liknOjPl3DcWzNuA.NfOCFmlHav ZTN38Zbqki9IZZ6uZQKYqH5mejaA_c351AkIJBuBSEv2wAiHM4jjCkYof1IE- Received: from sonic.gate.mail.ne1.yahoo.com by sonic306.consmr.mail.ne1.yahoo.com with HTTP; Mon, 16 Dec 2019 22:38:24 +0000 Received: by smtp411.mail.ne1.yahoo.com (Oath Hermes SMTP Server) with ESMTPA ID 93195002d59abd5bf2e6730fba371f7f; Mon, 16 Dec 2019 22:38:22 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov Subject: [PATCH v12 22/25] Audit: Include object data for all security modules Date: Mon, 16 Dec 2019 14:36:18 -0800 Message-Id: <20191216223621.5127-23-casey@schaufler-ca.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191216223621.5127-1-casey@schaufler-ca.com> References: <20191216223621.5127-1-casey@schaufler-ca.com> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: When there is more than one context displaying security module extend what goes into the audit record by supplimenting the "obj=" with an "obj_=" for each such security module. Signed-off-by: Casey Schaufler Acked-by: Stephen Smalley --- kernel/audit.h | 4 +- kernel/auditsc.c | 110 ++++++++++++++++++++++++----------------------- 2 files changed, 58 insertions(+), 56 deletions(-) diff --git a/kernel/audit.h b/kernel/audit.h index af9bc09e656c..c9f1e1641542 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -78,7 +78,7 @@ struct audit_names { kuid_t uid; kgid_t gid; dev_t rdev; - u32 osid; + struct lsmblob oblob; struct audit_cap_data fcap; unsigned int fcap_ver; unsigned char type; /* record type */ @@ -152,7 +152,7 @@ struct audit_context { kuid_t uid; kgid_t gid; umode_t mode; - u32 osid; + struct lsmblob oblob; int has_perm; uid_t perm_uid; gid_t perm_gid; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index e0dd643e9b13..0c071947c2b3 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -659,17 +659,15 @@ static int audit_filter_rules(struct task_struct *tsk, if (f->lsm_rule) { /* Find files that match */ if (name) { - lsmblob_init(&blob, name->osid); result = security_audit_rule_match( - &blob, + &name->oblob, f->type, f->op, f->lsm_rule); } else if (ctx) { list_for_each_entry(n, &ctx->names_list, list) { - lsmblob_init(&blob, n->osid); if (security_audit_rule_match( - &blob, + &n->oblob, f->type, f->op, f->lsm_rule)) { @@ -681,8 +679,7 @@ static int audit_filter_rules(struct task_struct *tsk, /* Find ipc objects that match */ if (!ctx || ctx->type != AUDIT_IPC) break; - lsmblob_init(&blob, ctx->ipc.osid); - if (security_audit_rule_match(&blob, + if (security_audit_rule_match(&ctx->ipc.oblob, f->type, f->op, f->lsm_rule)) ++result; @@ -956,13 +953,57 @@ static inline void audit_free_context(struct audit_context *context) kfree(context); } +static int audit_log_object_context(struct audit_buffer *ab, + struct lsmblob *blob) +{ + struct lsmcontext context; + const char *lsm; + int i; + + /* + * None of the installed modules have object labels. + */ + if (security_lsm_slot_name(0) == NULL) + return 0; + + if (blob->secid[0] != 0) { + if (security_secid_to_secctx(blob, &context, 0)) { + audit_log_format(ab, " obj=?"); + return 1; + } + audit_log_format(ab, " obj=%s", context.context); + security_release_secctx(&context); + } + + /* + * Don't do anything more unless there is more than one LSM + * with a security context to report. + */ + if (security_lsm_slot_name(1) == NULL) + return 0; + + for (i = 0; i < LSMBLOB_ENTRIES; i++) { + lsm = security_lsm_slot_name(i); + if (lsm == NULL) + break; + if (blob->secid[i] == 0) + continue; + if (security_secid_to_secctx(blob, &context, i)) { + audit_log_format(ab, " obj_%s=?", lsm); + continue; + } + audit_log_format(ab, " obj_%s=%s", lsm, context.context); + security_release_secctx(&context); + } + return 0; +} + static int audit_log_pid_context(struct audit_context *context, pid_t pid, kuid_t auid, kuid_t uid, unsigned int sessionid, struct lsmblob *blob, char *comm) { struct audit_buffer *ab; - struct lsmcontext lsmctx; int rc = 0; ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); @@ -972,15 +1013,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid, audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", 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, LSMBLOB_FIRST)) { - audit_log_format(ab, " obj=(none)"); - rc = 1; - } else { - audit_log_format(ab, " obj=%s", lsmctx.context); - security_release_secctx(&lsmctx); - } - } + rc = audit_log_object_context(ab, blob); audit_log_format(ab, " ocomm="); audit_log_untrustedstring(ab, comm); audit_log_end(ab); @@ -1207,26 +1240,14 @@ static void show_special(struct audit_context *context, int *call_panic) context->socketcall.args[i]); break; } case AUDIT_IPC: { - u32 osid = context->ipc.osid; + struct lsmblob *oblob = & context->ipc.oblob; audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", from_kuid(&init_user_ns, context->ipc.uid), from_kgid(&init_user_ns, context->ipc.gid), context->ipc.mode); - if (osid) { - struct lsmcontext lsmcxt; - struct lsmblob blob; - - lsmblob_init(&blob, osid); - if (security_secid_to_secctx(&blob, &lsmcxt, - LSMBLOB_FIRST)) { - audit_log_format(ab, " osid=%u", osid); - *call_panic = 1; - } else { - audit_log_format(ab, " obj=%s", lsmcxt.context); - security_release_secctx(&lsmcxt); - } - } + if (audit_log_object_context(ab, oblob)) + *call_panic = 1; if (context->ipc.has_perm) { audit_log_end(ab); ab = audit_log_start(context, GFP_KERNEL, @@ -1366,20 +1387,8 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n, from_kgid(&init_user_ns, n->gid), MAJOR(n->rdev), MINOR(n->rdev)); - if (n->osid != 0) { - struct lsmblob blob; - struct lsmcontext lsmctx; - - lsmblob_init(&blob, n->osid); - if (security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_FIRST)) { - audit_log_format(ab, " osid=%u", n->osid); - if (call_panic) - *call_panic = 2; - } else { - audit_log_format(ab, " obj=%s", lsmctx.context); - security_release_secctx(&lsmctx); - } - } + if (audit_log_object_context(ab, &n->oblob) && call_panic) + *call_panic = 2; /* log the audit_names record type */ switch (n->type) { @@ -1929,17 +1938,13 @@ static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, struct inode *inode, unsigned int flags) { - struct lsmblob blob; - name->ino = inode->i_ino; name->dev = inode->i_sb->s_dev; name->mode = inode->i_mode; name->uid = inode->i_uid; name->gid = inode->i_gid; name->rdev = inode->i_rdev; - security_inode_getsecid(inode, &blob); - /* scaffolding until osid is updated */ - name->osid = blob.secid[0]; + security_inode_getsecid(inode, &name->oblob); if (flags & AUDIT_INODE_NOEVAL) { name->fcap_ver = -1; return; @@ -2285,14 +2290,11 @@ void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) void __audit_ipc_obj(struct kern_ipc_perm *ipcp) { struct audit_context *context = audit_context(); - struct lsmblob blob; context->ipc.uid = ipcp->uid; context->ipc.gid = ipcp->gid; context->ipc.mode = ipcp->mode; context->ipc.has_perm = 0; - security_ipc_getsecid(ipcp, &blob); - /* scaffolding on the [0] - change "osid" to a lsmblob */ - context->ipc.osid = blob.secid[0]; + security_ipc_getsecid(ipcp, &context->ipc.oblob); context->type = AUDIT_IPC; }