From patchwork Fri Jul 26 23:39:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 11062093 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 52E4A13B1 for ; Fri, 26 Jul 2019 23:40:07 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 476B428B20 for ; Fri, 26 Jul 2019 23:40:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3C24128B21; Fri, 26 Jul 2019 23:40:07 +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=ham 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 963EE28B63 for ; Fri, 26 Jul 2019 23:40:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728218AbfGZXkG (ORCPT ); Fri, 26 Jul 2019 19:40:06 -0400 Received: from sonic303-28.consmr.mail.ne1.yahoo.com ([66.163.188.154]:43956 "EHLO sonic303-28.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728189AbfGZXkF (ORCPT ); Fri, 26 Jul 2019 19:40:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1564184403; bh=n9KYhenHMFy6/DvHoF7GAdIedxEuRn1itu30mtANhCU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject; b=On36LP4Slld1mQXLhP4XQTsCH4DtVy6vWuQbqNPssQZo50tBh6hswUX0tQTU94wgK6wF0Fqul8cvyEHqYIyniBR3yeHOaXUXOTMQPLkUFElwy3pClpl1dr5b9RrCmTUiGxgdKI80Iovj5+pSAtE2YoowOPhc4hMmUmJwfycjD2NjmiU4JWeW22+ZP23tTn0nPnovb7lF/mKXXr+uxW9yeGsvYpgN1ffvEo67Uz5O3XNo6iACvCvtM9p5NhocVtQAw2Niu4BFhlv73YZ6QtT3ShOqniGfps1uhPclrVKfS/oZkIprkJnbt9nuna/zVG/wxLUoH6/BCIlLMpm+miX1rQ== X-YMail-OSG: _qKYDBEVM1lB2B0CxbOI4GLTwTJwN5G1DW7gJj3ioR85yEUO_NOVIfD5MmVkysa Czol9HLAhexvWNbN_cMrgJob0nI04ucaN401IrheluokZAxs3tqNNGxk4uS5zNzT.3NB8lEn9mcB 95OGkbz3ALzkrsfuxFBezdz.yACNDm__brFNdflnU.KrKM5wlP__Sv5UnKwPDrt8di_Kwgwu.xak LSN_J0FGiyHZl77cjLthbJ.Xp2W2_D_HrXq2c3E7D30ewNWUmHVNt6uvBXig5mH.PnxBl8FYq1Ux ZFaZrC9mUFOe2g8gmbMLQgbtNoulKY3zlUMkZMgs0dRXhgRhjwl0U0xCyuYxFfzeMpY7FZ4ZtK06 OoVbEnAz2XZq8xmBo7ig.0sAmWsjXnI1TU4XqZvVWmQrLVDGCN97ackLFcSMNIMPQ8X05jPTFJEb FA2VJW.57Hfkt29vjC22_uXWmOBJVhT_ocxFdsHnOh69JOO6DE3.uYG9GQ3lzeRKEKMteYxogoO4 F4uz8AHqz0DhVf_0ltTk6zzX_hfYff3AGq9NwzMpwmTzOx_IBzknhgKA5UN5p8YL.9jiu4mZ3EIr IFoFomrLf1PLHtEOYA9cIaNLa2A9_tmnS08F2AAgqOfg7ipzvDMGcO7swfma3x_NDl7OafmDgDhR Iyy__8UKlrkW1NDp0V8sQLwZ.qPwuGixyVmxk15JxRipDx_poYXVcvVRRplm_U.EE8m73TvPBcfs Qvb2uhhBNj9xoqhxE444wmAgwEWzIj0lkVpKdXDh2kRl1jrDmTrVf8qZ0inQyxTgbz9RIvuy_RxP k_IPje7AAbImDSawK389nD8jWqrBJ4X9zLDt.octHMj3wetqMvkwfj7E7Lupm3zD24CVVYdsjLX. 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Signed-off-by: Casey Schaufler --- 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 29e29c6f4afb..af9a7d1fc069 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -91,7 +91,7 @@ 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 */ @@ -165,7 +165,7 @@ 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 46d7a58babd2..04367c3593e4 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -646,17 +646,15 @@ 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)) { @@ -668,8 +666,7 @@ 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; @@ -937,13 +934,57 @@ 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); @@ -953,15 +994,7 @@ 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); @@ -1187,26 +1220,14 @@ 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, @@ -1347,20 +1368,8 @@ 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) { @@ -1908,17 +1917,13 @@ static inline int audit_copy_fcaps(struct audit_names *name, 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; @@ -2268,14 +2273,11 @@ 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; }