From patchwork Tue Dec 17 23:08:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 13912666 Received: from sonic303-28.consmr.mail.ne1.yahoo.com (sonic303-28.consmr.mail.ne1.yahoo.com [66.163.188.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D7AB21F8F10 for ; Tue, 17 Dec 2024 23:10:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=66.163.188.154 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734477049; cv=none; b=d+zObrxzYtomoOMXzeIClx5WG/kWCjy6QICl0zRy2RfxEimudSkSCMIknI9Iz7Rm/SpnoaFwS19rm88L5lQnY24J0f1iyUsQHW+30ect1GTniiv3cfdxLTbIer13GoyKtCw+D7oMZunASX2Shu6wVnebib7h+1Wm1yi+EZGKx0o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734477049; c=relaxed/simple; bh=qX+OFbrUNN8oXf9MBad7xVOOtkZ2I2WKCJ6llialqCo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=osqQZf9KrnXq/s1TyPjG6aqAeWZ/p+uu+1oFdKj6PbR/TV4sf4R0fvwUBGZmwfbo8nWieRVID1TxXIeKRm5qdzE9OvEoi5+Tb+a0pWuz0c8ieNXBDMEJp/8a1l6ZYW3KUDoI585ot4vaM3npdox9WgSW5rsmatOp7anfnP9jIOI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=schaufler-ca.com; spf=none smtp.mailfrom=schaufler-ca.com; dkim=pass (2048-bit key) header.d=yahoo.com header.i=@yahoo.com header.b=lryFGRuY; arc=none smtp.client-ip=66.163.188.154 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=schaufler-ca.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=schaufler-ca.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=yahoo.com header.i=@yahoo.com header.b="lryFGRuY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1734477047; bh=TqGe56loa1w3C+AMDAGOL3FmR+EcN/OyGFaC0qH2kGg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=lryFGRuYjARyaDRF0Q7sXfjNzFKDDX+tjs4zIg0UNheS8/C+xnHqiKGPXlzjs6o4+inCRP+z/PgA8pusCGbgUJ9AelDmdQA9OPnX7sKg3E7Wcisy2lkVpAgj6nd2FPyI0JksMtZ+DpklmLtbFtQ2feZtneUk4u2WyVDf+KBZtxDh3lhaREOhSvGfPnzeeY/9d+UjMVwIwQ//CEachjorzPOoiIneQJ7m0MzvVSNdOldyXssbE3gCwSEVFzXZiAjlkZ4Ab5fB0y2tDVrfA98Eexbu9DH06N9ekvt+cF/h5U7s343ghk/f65eNe4l/FrU+4xWf9Z/HfGfbZQvj7C8JXQ== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1734477047; bh=2T65U/Pcp3lObzK4TINVtYDCSfxL0+DIKPS5Ym5g5ZX=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=ExXLMe7ZyKMiu6FPSBv8TP6Z+OWCdL+W9x/FaTM9oJ0M7RbJhu1rGEN0M9W7YNRQXJLOplA4NaRjbFMH1nwfXrhRvQ9e2mRIIOZTuiEgYNIkLZRUfQ9dzX8y1bhlIhpo0zerv5eRLEs2G5erCRU6mR9JDl9fUUhN81mphpuH3E50100txVAapeXrwnyWl4SvccGZP0ccE/VV/ellJ+ejPSKydiXd5oZRNUOgm+blXW3rZnsMc6xXLJWmADG2Hq5jeBal35ZYw0GZL4cb4dMY1LuGJ8SeFvnF3FuQtg/5ambwYSzuP2DuqE+d4twCHBLaLPDCQPdl+D2DnqqlDl678g== X-YMail-OSG: QM2omh0VM1n6zQysOAWIFWGcOQ3HjOdoplxENQVw4jEUU_96dzjxBgliSIV6ZL0 DqmyudpHpfV5jFoa1Uqj.JxLwCSSkFwo2lZUPgTyyKp9B3IXK98F57xKw_Eu1y07CqsyjXwhiYGc .rvhxGxGBQS_uwXANx4tdQTalukjNjTRJmG7B6BbYN3Gb29vmqg2HbL4GO.BcjLNR1__M1PP_19i KMgx_MgP9dK4tzb0jHvEyDJwmhWuFSTnNZGmPJykoTXXccqUKPMsM18agrB1jsu1S_MM35LYU5p. Eqf92VorCiP2JbnInrqlqQaziJFztKMsRHhppv_1.UrLOtRwKM8ucxvAUQ2kq.jXdXWELa941Rvb k0ipKsZnVEpyGfLUaBF62.OyNBNZsEqBHW3Gah1RpnwTCx7BqQmwO1Bcs_YkMe5UefFNqAsrWfpP HxkXbCep0IoarhuYIGmZlpd7d9C_ZDv3O7Oyu9sCA1oc0iCgkp._P8h_QZz0yHogfNi.5_Lx.YDF rVwZW6VO4nZbMo8B2SqVuoEr6CovRJ2Bc9EoIR7KEEYJzBlokEgxulMy2TvNGMgGCSkIjSdvgiQP JfvQt_ne_xvrBkGV7E2yDQE4DVOUiKI_LsNVtBkUFKOa0.bMYKhf_0btsaIhO6XHQQNuSQYa9big uNU.kt_J4dentAdvClva3jc0BhGX4Qb41jK1G4OrzKeeFkpxp8LOKWYcGTDAnFdZVhZgHfkrmg1J j1l8M2qFcZQKdiO6iR4OLAXQVbWyTtIJEF6U5Bg17acXoMIiznljNNmCid1U9nZ5bnnjSxB2VNC_ hHZbSeoLH7WlVGxH9Z6la9nWRwtOfyDEcpqPGOe4Z_hVIHxVdQunHKadmDVHyGUNf3dGlQrXijDK ajXrCNKpGG8fJqPYdh7MyvxXaxQTKa.SINNH6dspDS75gi7FfJ4BnjT6DfnWkPxFRWVm0vSH0fKs 8leqmPo8yX7ZPuYOQqjw9gyft_4ihGiy1SaXox5EoCK.Xtr50j9Hx0Dy9bMcLPVPJAqWizenRdNE USs3l_fpWSVkXO4w8XCvXKzdpkU8tNL9LKfNFoP22RW5STyyspECAa8vDzVgGIZwIANlDCmeQjyx gl2asIWMgEh14UcpGdi3KbAdjf0MmTq5t__f8qc6DGWzPZKzz4.IW3IlfAQinCdk55xomghznOvR 6pQBo1cC0GZ.YZWyZt14ndOg_VLWMDkTqzO6xq9zVT20jWxmZ_1r6GBXqATHPHfluOEDcx2Xobd6 VPqXWLsaRXc64A6XjXkoEfk8DH_7uLQSo_.P9_U.8iSXlqU9TIVqtSuVYth34rt7AXvK0CkTirim ycFvIaNVfdGBhww5YujDh.bdEjVswQxfI1uvltO0J2I45PeNJInzUPuRpzz8PtVj86FO4c48Xnz5 HptUnu_slMe6n46WibnLRyn_cXEC6iys.nOnXCSllgQ7QW1WdnG.nSSdxBqorDG3G_VKeU0b4Nmm GkUQcYyZ0zIobWQGxcOpGj6G8Bf5TvMb3eIKrGC4JdpBF7rMel03wQQx70mRQAFwIBsQq15fslZS nEO.3XUbE76Xb_ZTGoLieUZbkJp14phxyvH1SHiEFj_zejCHDfCmj020UJSyVsR2tB.VN9LP3Nt2 B5ei58RaQxM8aita3RlZ7s6vM6yt.WwNqPXpa7FHWyHYSyI7AUS3BwaBCUXYEfDhE0oRvptWmp_N jXKXhBCpijuEV2QnxeM2LqJCqAsKsQPCDsYixgE6FEHNe31jLQvVL2kiG8YBJPMczVl9wcH.rPDm 8dTMiGj0YlDpiSFRKiiJBGv2tOMqTu7Q3AWM6QmGzi8W6PqrmE_5wZloQv0OwkcRcP15C9RrNHMH Xp68sbTg25u8eqx0XKYeaRfu3jXY0xMNnzDBbqiyeXPbCAFNP7R0jTCYTQh41QpD5nMUgKFlY7q. txiCqVmI7SwnxXZ2UXuLs6rUHePSpH.CanVhkd5kK9l9HCj5wcr.zUgdp_OJsW.3zblCIIbHQvLt jgABb4TQC2cI4bTjtAofR_FKZvPeyqz9lBIBGeYBugmYBwKSKQyv9PGWsQI8cyit9MkDSVmaKaYu UXH9vExfho8awroNgkjtGTBv_UF1wzVtXFB0tmJZxEpOS8uNylVc2bPiK4hYjiW_ElbElYJ.49gC P5Lt2ik3ayat2cPJE6XSs3uj2VsrWEyOSAqh1zgO094UneRetTWav.qjhvB1_L81DM1zj8gnN8G5 .Tud5jajF9O.IVrxIZ_5k7NK...AgvYHcj1gGxRTe8M3GsRRN4uoUlFEKcq0aTknuE3MIrtxYpYM XpVgZi0zE6nRjyhpJHkd2fMeTqiJC X-Sonic-MF: X-Sonic-ID: caadaba1-6e42-4a81-b642-653891c8820f Received: from sonic.gate.mail.ne1.yahoo.com by sonic303.consmr.mail.ne1.yahoo.com with HTTP; Tue, 17 Dec 2024 23:10:47 +0000 Received: by hermes--production-gq1-5dd4b47f46-5qmz7 (Yahoo Inc. Hermes SMTP Server) with ESMTPA ID 5db27b1e04260d36afba83cfa77500a5; Tue, 17 Dec 2024 23:10:43 +0000 (UTC) From: Casey Schaufler To: casey@schaufler-ca.com, paul@paul-moore.com, eparis@redhat.com, linux-security-module@vger.kernel.org, audit@vger.kernel.org Cc: jmorris@namei.org, serge@hallyn.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org, selinux@vger.kernel.org Subject: [PATCH 6/6] Audit: Add record for multiple object contexts Date: Tue, 17 Dec 2024 15:08:54 -0800 Message-ID: <20241217230854.6588-7-casey@schaufler-ca.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241217230854.6588-1-casey@schaufler-ca.com> References: <20241217230854.6588-1-casey@schaufler-ca.com> Precedence: bulk X-Mailing-List: selinux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Create a new audit record AUDIT_MAC_OBJ_CONTEXTS. An example of the MAC_OBJ_CONTEXTS (1424) record is: type=MAC_OBJ_CONTEXTS[1424] msg=audit(1601152467.009:1050): obj_selinux=unconfined_u:object_r:user_home_t:s0 When an audit event includes a AUDIT_MAC_OBJ_CONTEXTS record the "obj=" field in other records in the event will be "obj=?". An AUDIT_MAC_OBJ_CONTEXTS record is supplied when the system has multiple security modules that may make access decisions based on an object security context. Signed-off-by: Casey Schaufler --- include/linux/audit.h | 7 +++- include/uapi/linux/audit.h | 1 + kernel/audit.c | 51 ++++++++++++++++++++++- kernel/auditsc.c | 85 ++++++++++++-------------------------- 4 files changed, 83 insertions(+), 61 deletions(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index ee3e2ce70c45..16b89cbd6ac7 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -186,8 +186,10 @@ extern void audit_log_path_denied(int type, const char *operation); extern void audit_log_lost(const char *message); +extern void audit_log_object_context(struct audit_buffer *ab, + struct lsm_prop *prop); extern int audit_log_subject_context(struct audit_buffer *ab, - struct lsm_prop *blob); + struct lsm_prop *prop); extern int audit_log_task_context(struct audit_buffer *ab); extern void audit_log_task_info(struct audit_buffer *ab); @@ -248,6 +250,9 @@ static inline void audit_log_key(struct audit_buffer *ab, char *key) { } static inline void audit_log_path_denied(int type, const char *operation) { } +static inline void audit_log_object_context(struct audit_buffer *ab, + struct lsm_prop *prop) +{ } static inline int audit_log_subject_context(struct audit_buffer *ab, struct lsm_prop *prop) { diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h index 49bbae475c35..3e7462f9d80e 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -147,6 +147,7 @@ #define AUDIT_IPE_CONFIG_CHANGE 1421 /* IPE config change */ #define AUDIT_IPE_POLICY_LOAD 1422 /* IPE policy load */ #define AUDIT_MAC_TASK_CONTEXTS 1423 /* Multiple LSM task contexts */ +#define AUDIT_MAC_OBJ_CONTEXTS 1424 /* Multiple LSM objext contexts */ #define AUDIT_FIRST_KERN_ANOM_MSG 1700 #define AUDIT_LAST_KERN_ANOM_MSG 1799 diff --git a/kernel/audit.c b/kernel/audit.c index f58bfa5c9635..62041cea6aba 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1116,7 +1116,6 @@ static int is_audit_feature_set(int i) return af.features & AUDIT_FEATURE_TO_MASK(i); } - static int audit_get_feature(struct sk_buff *skb) { u32 seq; @@ -2302,6 +2301,56 @@ int audit_log_task_context(struct audit_buffer *ab) } EXPORT_SYMBOL(audit_log_task_context); +void audit_log_object_context(struct audit_buffer *ab, struct lsm_prop *prop) +{ + int i; + int error; + bool space = false; + struct lsm_context context; + + if (lsm_prop_cnt < 2) { + error = security_lsmprop_to_secctx(prop, &context, + LSM_ID_UNDEF); + if (error < 0) { + if (error != -EINVAL) + goto error_path; + return; + } + audit_log_format(ab, " obj=%s", context.context); + security_release_secctx(&context); + return; + } + audit_log_format(ab, " obj=?"); + error = audit_buffer_aux_new(ab, AUDIT_MAC_OBJ_CONTEXTS); + if (error) + goto error_path; + + for (i = 0; i < lsm_prop_cnt; i++) { + if (!lsm_idlist[i]->lsmprop) + continue; + error = security_lsmprop_to_secctx(prop, &context, + lsm_idlist[i]->id); + if (error < 0) { + audit_log_format(ab, "%sobj_%s=?", + space ? " " : "", lsm_idlist[i]->name); + if (error != -EINVAL) + audit_panic("error in audit_log_object_context"); + } else { + audit_log_format(ab, "%sobj_%s=%s", + space ? " " : "", lsm_idlist[i]->name, + context.context); + security_release_secctx(&context); + } + space = true; + } + + audit_buffer_aux_end(ab); + return; + +error_path: + audit_panic("error in audit_log_object_context"); +} + void audit_log_d_path_exe(struct audit_buffer *ab, struct mm_struct *mm) { diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 3fbb1578b820..e5faeab03a56 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1092,36 +1092,24 @@ static inline void audit_free_context(struct audit_context *context) kfree(context); } -static int audit_log_pid_context(struct audit_context *context, pid_t pid, - kuid_t auid, kuid_t uid, - unsigned int sessionid, struct lsm_prop *prop, - char *comm) +static void audit_log_pid_context(struct audit_context *context, pid_t pid, + kuid_t auid, kuid_t uid, + unsigned int sessionid, struct lsm_prop *prop, + char *comm) { struct audit_buffer *ab; - struct lsm_context ctx; - int rc = 0; ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); if (!ab) - return rc; + return; 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 (lsmprop_is_set(prop)) { - if (security_lsmprop_to_secctx(prop, &ctx, LSM_ID_UNDEF) < 0) { - audit_log_format(ab, " obj=(none)"); - rc = 1; - } else { - audit_log_format(ab, " obj=%s", ctx.context); - security_release_secctx(&ctx); - } - } - audit_log_format(ab, " ocomm="); - audit_log_untrustedstring(ab, comm); - audit_log_end(ab); + if (lsmprop_is_set(prop)) + audit_log_object_context(ab, prop); - return rc; + return; } static void audit_log_execve_info(struct audit_context *context, @@ -1391,18 +1379,8 @@ static void show_special(struct audit_context *context, int *call_panic) from_kuid(&init_user_ns, context->ipc.uid), from_kgid(&init_user_ns, context->ipc.gid), context->ipc.mode); - if (lsmprop_is_set(&context->ipc.oprop)) { - struct lsm_context lsmctx; - - if (security_lsmprop_to_secctx(&context->ipc.oprop, - &lsmctx, - LSM_ID_UNDEF) < 0) { - *call_panic = 1; - } else { - audit_log_format(ab, " obj=%s", lsmctx.context); - security_release_secctx(&lsmctx); - } - } + if (lsmprop_is_set(&context->ipc.oprop)) + audit_log_object_context(ab, &context->ipc.oprop); if (context->ipc.has_perm) { audit_log_end(ab); ab = audit_log_start(context, GFP_KERNEL, @@ -1558,18 +1536,8 @@ 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 (lsmprop_is_set(&n->oprop)) { - struct lsm_context ctx; - - if (security_lsmprop_to_secctx(&n->oprop, &ctx, - LSM_ID_UNDEF) < 0) { - if (call_panic) - *call_panic = 2; - } else { - audit_log_format(ab, " obj=%s", ctx.context); - security_release_secctx(&ctx); - } - } + if (lsmprop_is_set(&n->oprop)) + audit_log_object_context(ab, &n->oprop); /* log the audit_names record type */ switch (n->type) { @@ -1774,21 +1742,20 @@ static void audit_log_exit(void) struct audit_aux_data_pids *axs = (void *)aux; for (i = 0; i < axs->pid_count; i++) - if (audit_log_pid_context(context, axs->target_pid[i], - axs->target_auid[i], - axs->target_uid[i], - axs->target_sessionid[i], - &axs->target_ref[i], - axs->target_comm[i])) - call_panic = 1; - } - - if (context->target_pid && - audit_log_pid_context(context, context->target_pid, - context->target_auid, context->target_uid, - context->target_sessionid, - &context->target_ref, context->target_comm)) - call_panic = 1; + audit_log_pid_context(context, axs->target_pid[i], + axs->target_auid[i], + axs->target_uid[i], + axs->target_sessionid[i], + &axs->target_ref[i], + axs->target_comm[i]); + } + + if (context->target_pid) + audit_log_pid_context(context, context->target_pid, + context->target_auid, context->target_uid, + context->target_sessionid, + &context->target_ref, + context->target_comm); if (context->pwd.dentry && context->pwd.mnt) { ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);