From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87C37C43461 for ; Thu, 13 May 2021 20:12:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D2C4613B5 for ; Thu, 13 May 2021 20:12:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232553AbhEMUN6 (ORCPT ); Thu, 13 May 2021 16:13:58 -0400 Received: from sonic317-38.consmr.mail.ne1.yahoo.com ([66.163.184.49]:37132 "EHLO sonic317-38.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232540AbhEMUN5 (ORCPT ); Thu, 13 May 2021 16:13:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1620936766; bh=wUB0iYE8Twioo5ZIk6y7nf85VKY6XjvcN02gxsSW0T0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=nSdXTqCUZm1Vp+aW4h4oiIwz+rcxGs57ajQWFQUm6e/+iK8QLXnVgkEkokbgjMI57CrWh/o10ZlfCoKUl6770n/oJN4JIE7zPntl9fcs0917OnGQWJA63SMqEKsNmZejfZwi65rXbdR4HRUoZvgWRz0wtisTJv0Afz72rRn23LwQkUXFWj2ve/7Zr1jmLlpAxw4MZdd5ND9o5a+KvW31kElqX0L6tBedomUvR9J0agkYs1RkOYsXJLpoTH6nWBRfjMjshwSj/wsZyFIiyq9OS26gOlDXw3q+dK5k1hZZdepqhr6EyvPLms/dFyez5XWEAs943wbr21Y9TY0fN70fYw== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1620936766; bh=tEAjkkTzf9hkTGPbh8mdDK6q/4dxkK9cvxYj2wxIlJI=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=VWB6MCYCCCMY28WkQXgTrB0wx7G46dHfsLlDL6RDPSSD31A8fYfJOPx2iXbQT5wXlmgFaoxrD6Vr5vulbfgx2uUH/FzOgDjXpNVDwa+MQDl9ouqCoy6XqXFKeWnRHktjtUV218WV7lRg9Lvn84brcxpqVeJ1sXi+6L+/M72gNl51tQvzGBH8AoG57CL+n8K1Pcq5aqqMSDRqCsjlbxPw/m/cCKRM5K4cK+NSwqXtnYYAHdup1CFD4CSR3Z6A1X0HPy0TtyegaCdsjUjCp/hfCpzuVT4MZg2cb1CjS13Is7IooutR+zRMZbHAsH0uzMM9PG6kAD2FSbITrpopffFbvQ== X-YMail-OSG: 9kXz4IwVM1lE1GhB.wvWjJgckIFxM_gPc9AYuONZkMGTRzYpOWQYGtAAUYsKzH2 TMgqqPM0ZTF0AeDFmG0oIclSJ3d.BGTJaPsaygYuoekw5BgnRvDbFPFzu_3Qd8djSCgyee4UvpJJ YMfGXW0KAcqXv_rE026aSKmgkzs6F4ndAN4ImdTiI2FP5CK47qKaiL0ynxxfHPeUPZ91d4ZmIkau hKsUfOHRqwbZJZiB7ZNOXKC32HIHT0HGfRqX6lKT3Th2HYw_gvzPNs7NqnGoFAL6gthp1iQb5COb SfALF66dmJubwGDISyIbmfkRcYLaKnsJ_4q2aV_urpfSBy.VoAYoh_MRflD1H86CHwDDbr9_oAhg zlFrFLzm0iQQr_BEfh69qAf4nvYckFUsxDxIZ7TkjaJkXkC4_DhwnNVkJhFLQdTnZFsDGK32y7_1 6GVTBiEzWX4v3H1TGaSoImLogjwNEwGUhLlfcGfktDI9DgzGh5Vab69PjfkFJtrzVZD2LtI.w0xo MsJ4Aa9LcRbmvR01Cx3i_LpMs9MjebdHTjQZcSRPkX7SVbLS7FVk8GWVZbZM7fSG_PzZgCpdpAW1 98Au5CBxkZkje94Xn73NKLCL8kPDgXWbGwOQSG8EetFEIfvRjXxoiuNA35TCfm42Q1A7OK.SQJNw jbz9BT31kJwCFFDt6.WZUQrYg1NF6od_DLBZ7Tc0ALmf_ZFk1Naej1ZuiguZTxwY8ZmGq_HgDB_X 4G2whssJpkzMawQ0pcW6W9BbJol9jEff1xdZz4yt1gVQnh7JUDch4fFXzIyp_K_cf_wk_f5DdmVv PO9E.faL_yVsOVQ27dxOMOjLArRosxHQnb5TpN3ID6NM.qZEoFIc1b6OCsVDRQcBoiVAJ0NoKgfm 7OsYaaA90VrWiw3rb.TtDI95m6m2B4jc7.Gl8.0roRbu8VadUlMpPeA9WhVZrwUNr1q8MFoxVeDu a3ZZsxUy73HPuNDMN8ukcRiyEZkHrTP6eM3VvcrBdzJnFTGAYlXzigHXcrtXEN.RvtiHeAoAV4KJ YIQNRF6Nta0Kkl6Kg.0uBoXB7SooIahWXyq6ybgUT455k_kOvM75qlRQZeVui66rHUSrvnpxIqHP GHLVJBcu5f5m1InF5N7wR4Tnm2uKMR235.AiV7__W_ie_OF3FOfBtVEW0UioYmiPFIogdmbHRhhx ewZNEYygSaqrS4IPflNz8CYA6iI7eo4FrjH84h09u8MTA1dfEiohGtj2TQHNJ9RMuea9JA9_gIQb VI.HDCruk2dY9_zr9VNSfVQ75cSXY_MX7ydVv7Kn6TmeFsR8ykE7MoBUQEZANFTBM6bgBYGulbZ0 7LEGc1Kjq1yZWvFGPdNJDyEG0XmPcGSUeqOOkTDHdz6xZSw5KMGW4Pj3dul7Mq4ezpsdoqrRSL5s NtKfak6s2t.GhVQo6CneZGLV5PqCfqSIVqXl3MFSh.J5UhpvhLScLPUHFnLs012VgeB2j8Ra71yq QHf9ca0fTuxMJjo5tB4yyMWxoXfcet0YTs2.vjRjDAdpUwNiKX7lsrctnsDGRLsxQ1zd1_vY4qjG RT2GT.C_u2dubmS_okdIqkk5tQYtU7Z4OL.NXb5gp3VdRJKfAj1Sv9r_1Lj36dUFub8xPcy1tcFF S2NyBOKCxgox1469xaVs0qIyhi66Mmb58iv7A8EbcwdC9wduQjoDSoEUw7NGVEsGChzko8GhLp_x z9b57jhURZMBreywz.L8HhmMdD7CjYkr.f0oFKPUNzxC5uMqMuy_hA34UXjQHDlQfaTiMdRGafZi QZXanTXm_ckw1TlBzPvIWyjQMKIvlEkqrmbGwUIneonUNIJQ67JRoW6XC7JCWUEAdZbSybAo9a5n 8qbGJyEm.90wpspq6ZzO50MAyiV2rEz1CQLtTXJ8lrLkhqVTRDUNAPvkw23_6x629NBCW9kfc52H x6Li.Xnv88k8NtMCenCLsYLDXIwPId7h54D_zVUAJf6CUDIikV2Tbd18wT3_TFkv2g6cwV2Ynl3_ stk_37rYmWdhkZ8iFl6gyhKt84zWRlatfm1TS_QNSH_tbIgXCOlLUiJm8zHnR4AOh8DdHoGEL.5x FDjUSt_qh71IokuO1nNUIfLtYh.zMUs_lVbhCHPowwLt_QDNBxX_yvrm_iEFwgIcODdZaGwYys2k BC5OiqII4IGw033haOZ9RDVPa7LMbRgjQ.lYzJxZZsdmFX9cpC194yjY29JGirSSR41.f6.6jCmZ _TqGkdfxBP67xSRzRWrsMrn5aNO52t3YwWfO0hRjtt8l7QKljRT3aMRxCqjpunKJiUBTR3uSI.HU vi3IKxmLW1BuxAJAaVmU_6muvOp5jXbCN6zQstDwC_0dFPWC1xXyzkzMRWC943PW6PYjt9Kow9rS 5zDX6iZMCB6QgVnUOdW.kqbtRneacpFcwfKBJIQ5eM60jE4fW3OSY7LTLcZ4NMTEB98kTbTvjusb 4fsla5XUH4oEErRdZa.S_2cO9RKH9G9uImsfEl8ofQVCAns7TN4T1MEdD61PoUTcGbCZfRKyI40_ 4aFb66SZvz9w9lxPAoXUCpI1f8QSV.88y76zjE_yuCMoLHayUM20w0.wk46CEa67mJvc27aVEuU7 Y2smNuA91EyY3aW9oMJTUPXKWrwA8m2A.1lobXK9uWDt3wZUjiLsAVS9jQQkkQrkyklskMRWVoji jolNDYFJdFyiRaFxcto1T21BIc1ntJxg_CSL7HgrPYoSOZX1SWuLpbygWh5ZHjM7F_iw66yrQGLi zxZOKDeJ3q8Goxbgek4ONPJUCNcX4JUTKI7bvV22hsJISL558AjMYqfhrMGfX8TwQtSLjerIpoMt 48KexM5znbnrTVFJViizCjtbevkysoXhYY4YT5vWFA6uQYk923rjdlIDFt4QCpp7W3d2ov11MbhR ary_dM_PiIErYEM7l_6iumf4DrSlPuTavvcQ9G5rs_k3.WJ4oGf1YZUafy7dPEj924JIXc4TFKDV xHXSCEjkQDAGFTj5dl3J_kSA6BueQX_CjdhfxAjim6DqAqZjyBOtsgwSJgUqMqe1Np1QDe6rjWeF m35pzAZpJ4LFdbcZ8dTedfnFF.T7s63ZLCTGbzjV638FecSnqPB3c.S1RmgwdGCEdWKJ4nVmsn1H bkbmKN6aBaoOMrbxZc2hYX3BEovRa4bBWQB2Fl2MNKgOQ.qhEXgl9PKcI4TQ- X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic317.consmr.mail.ne1.yahoo.com with HTTP; Thu, 13 May 2021 20:12:46 +0000 Received: by kubenode532.mail-prod1.omega.bf1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 2180a90ee2d0cc9936d3029a48cc28ba; Thu, 13 May 2021 20:12:42 +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, linux-audit@redhat.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov, linux-kernel@vger.kernel.org Subject: [PATCH v26 04/25] IMA: avoid label collisions with stacked LSMs Date: Thu, 13 May 2021 13:07:46 -0700 Message-Id: <20210513200807.15910-5-casey@schaufler-ca.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210513200807.15910-1-casey@schaufler-ca.com> References: <20210513200807.15910-1-casey@schaufler-ca.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Integrity measurement may filter on security module information and needs to be clear in the case of multiple active security modules which applies. Provide a boot option ima_rules_lsm= to allow the user to specify an active securty module to apply filters to. If not specified, use the first registered module that supports the audit_rule_match() LSM hook. Allow the user to specify in the IMA policy an lsm= option to specify the security module to use for a particular rule. Signed-off-by: Casey Schaufler To: Mimi Zohar To: linux-integrity@vger.kernel.org --- Documentation/ABI/testing/ima_policy | 8 ++- security/integrity/ima/ima_policy.c | 77 ++++++++++++++++++++-------- 2 files changed, 62 insertions(+), 23 deletions(-) diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy index 070779e8d836..84dd19bc4344 100644 --- a/Documentation/ABI/testing/ima_policy +++ b/Documentation/ABI/testing/ima_policy @@ -25,7 +25,7 @@ Description: base: [[func=] [mask=] [fsmagic=] [fsuuid=] [uid=] [euid=] [fowner=] [fsname=]] lsm: [[subj_user=] [subj_role=] [subj_type=] - [obj_user=] [obj_role=] [obj_type=]] + [obj_user=] [obj_role=] [obj_type=] [lsm=]] option: [[appraise_type=]] [template=] [permit_directio] [appraise_flag=] [keyrings=] base: @@ -117,6 +117,12 @@ Description: measure subj_user=_ func=FILE_CHECK mask=MAY_READ + It is possible to explicitly specify which security + module a rule applies to using lsm=. If the security + modules specified is not active on the system the rule + will be rejected. If lsm= is not specified the first + security module registered on the system will be assumed. + Example of measure rules using alternate PCRs:: measure func=KEXEC_KERNEL_CHECK pcr=4 diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 5c40677e881c..d804b9a0dd95 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -79,8 +79,9 @@ struct ima_rule_entry { bool (*uid_op)(kuid_t, kuid_t); /* Handlers for operators */ bool (*fowner_op)(kuid_t, kuid_t); /* uid_eq(), uid_gt(), uid_lt() */ int pcr; + int which_lsm; /* which of the rules to use */ struct { - void *rules[LSMBLOB_ENTRIES]; /* LSM file metadata specific */ + void *rule; /* LSM file metadata specific */ char *args_p; /* audit value */ int type; /* audit type */ } lsm[MAX_LSM_RULES]; @@ -92,17 +93,15 @@ struct ima_rule_entry { /** * ima_lsm_isset - Is a rule set for any of the active security modules - * @rules: The set of IMA rules to check + * @entry: the rule entry to examine + * @lsm_rule: the specific rule type in question * - * If a rule is set for any LSM return true, otherwise return false. + * If a rule is set return true, otherwise return false. */ -static inline bool ima_lsm_isset(void *rules[]) +static inline bool ima_lsm_isset(struct ima_rule_entry *entry, int lsm_rule) { - int i; - - for (i = 0; i < LSMBLOB_ENTRIES; i++) - if (rules[i]) - return true; + if (entry->lsm[lsm_rule].rule) + return true; return false; } @@ -282,6 +281,20 @@ static int __init default_appraise_policy_setup(char *str) } __setup("ima_appraise_tcb", default_appraise_policy_setup); +static int ima_rules_lsm __ro_after_init; + +static int __init ima_rules_lsm_init(char *str) +{ + ima_rules_lsm = lsm_name_to_slot(str); + if (ima_rules_lsm < 0) { + ima_rules_lsm = 0; + pr_err("rule lsm \"%s\" not registered", str); + } + + return 1; +} +__setup("ima_rules_lsm=", ima_rules_lsm_init); + static struct ima_rule_opt_list *ima_alloc_rule_opt_list(const substring_t *src) { struct ima_rule_opt_list *opt_list; @@ -351,11 +364,10 @@ static void ima_free_rule_opt_list(struct ima_rule_opt_list *opt_list) static void ima_lsm_free_rule(struct ima_rule_entry *entry) { int i; - int r; for (i = 0; i < MAX_LSM_RULES; i++) { - for (r = 0; r < LSMBLOB_ENTRIES; r++) - ima_filter_rule_free(entry->lsm[i].rules[r]); + if (entry->lsm[i].rule) + ima_filter_rule_free(entry->lsm[i].rule); kfree(entry->lsm[i].args_p); } } @@ -406,8 +418,8 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry) ima_filter_rule_init(nentry->lsm[i].type, Audit_equal, nentry->lsm[i].args_p, - &nentry->lsm[i].rules[0]); - if (!ima_lsm_isset(nentry->lsm[i].rules)) + &nentry->lsm[i].rule); + if (!ima_lsm_isset(nentry, i)) pr_warn("rule for LSM \'%s\' is undefined\n", nentry->lsm[i].args_p); } @@ -596,7 +608,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, int rc = 0; u32 osid; - if (!ima_lsm_isset(rule->lsm[i].rules)) { + if (!ima_lsm_isset(rule, i)) { if (!rule->lsm[i].args_p) continue; else @@ -609,14 +621,14 @@ static bool ima_match_rules(struct ima_rule_entry *rule, security_inode_getsecid(inode, &osid); rc = ima_filter_rule_match(osid, rule->lsm[i].type, Audit_equal, - rule->lsm[i].rules); + rule->lsm[i].rule); break; case LSM_SUBJ_USER: case LSM_SUBJ_ROLE: case LSM_SUBJ_TYPE: rc = ima_filter_rule_match(secid, rule->lsm[i].type, Audit_equal, - rule->lsm[i].rules); + rule->lsm[i].rule); break; default: break; @@ -966,7 +978,7 @@ enum { Opt_uid_lt, Opt_euid_lt, Opt_fowner_lt, Opt_appraise_type, Opt_appraise_flag, Opt_permit_directio, Opt_pcr, Opt_template, Opt_keyrings, - Opt_label, Opt_err + Opt_lsm, Opt_label, Opt_err }; static const match_table_t policy_tokens = { @@ -1004,6 +1016,7 @@ static const match_table_t policy_tokens = { {Opt_template, "template=%s"}, {Opt_keyrings, "keyrings=%s"}, {Opt_label, "label=%s"}, + {Opt_lsm, "lsm=%s"}, {Opt_err, NULL} }; @@ -1012,7 +1025,7 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry, { int result; - if (ima_lsm_isset(entry->lsm[lsm_rule].rules)) + if (ima_lsm_isset(entry, lsm_rule)) return -EINVAL; entry->lsm[lsm_rule].args_p = match_strdup(args); @@ -1022,8 +1035,8 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry, entry->lsm[lsm_rule].type = audit_type; result = ima_filter_rule_init(entry->lsm[lsm_rule].type, Audit_equal, entry->lsm[lsm_rule].args_p, - &entry->lsm[lsm_rule].rules[0]); - if (!ima_lsm_isset(entry->lsm[lsm_rule].rules)) { + &entry->lsm[lsm_rule].rule); + if (!ima_lsm_isset(entry, lsm_rule)) { pr_warn("rule for LSM \'%s\' is undefined\n", entry->lsm[lsm_rule].args_p); @@ -1561,6 +1574,19 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) &(template_desc->num_fields)); entry->template = template_desc; break; + case Opt_lsm: + result = lsm_name_to_slot(args[0].from); + if (result == LSMBLOB_INVALID) { + int i; + + for (i = 0; i < MAX_LSM_RULES; i++) + entry->lsm[i].args_p = NULL; + result = -EINVAL; + break; + } + entry->which_lsm = result; + result = 0; + break; case Opt_err: ima_log_string(ab, "UNKNOWN", p); result = -EINVAL; @@ -1597,6 +1623,7 @@ ssize_t ima_parse_add_rule(char *rule) struct ima_rule_entry *entry; ssize_t result, len; int audit_info = 0; + int i; p = strsep(&rule, "\n"); len = strlen(p) + 1; @@ -1614,6 +1641,9 @@ ssize_t ima_parse_add_rule(char *rule) INIT_LIST_HEAD(&entry->list); + for (i = 0; i < MAX_LSM_RULES; i++) + entry->which_lsm = ima_rules_lsm; + result = ima_parse_rule(p, entry); if (result) { ima_free_rule(entry); @@ -1830,7 +1860,7 @@ int ima_policy_show(struct seq_file *m, void *v) } for (i = 0; i < MAX_LSM_RULES; i++) { - if (ima_lsm_isset(entry->lsm[i].rules)) { + if (ima_lsm_isset(entry, i)) { switch (i) { case LSM_OBJ_USER: seq_printf(m, pt(Opt_obj_user), @@ -1872,6 +1902,9 @@ int ima_policy_show(struct seq_file *m, void *v) seq_puts(m, "appraise_flag=check_blacklist "); if (entry->flags & IMA_PERMIT_DIRECTIO) seq_puts(m, "permit_directio "); + if (entry->which_lsm >= 0) + seq_printf(m, pt(Opt_lsm), + lsm_slot_to_name(entry->which_lsm)); rcu_read_unlock(); seq_puts(m, "\n"); return 0; -- 2.29.2 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3025C433ED for ; Thu, 13 May 2021 20:13:32 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 42FA6613B5 for ; Thu, 13 May 2021 20:13:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 42FA6613B5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=schaufler-ca.com Authentication-Results: mail.kernel.org; spf=tempfail smtp.mailfrom=linux-audit-bounces@redhat.com Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-324-Ohiug46LM7GMLHhtyB-5Fg-1; Thu, 13 May 2021 16:13:29 -0400 X-MC-Unique: Ohiug46LM7GMLHhtyB-5Fg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 16D95102C804; Thu, 13 May 2021 20:13:27 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DD91E5037B; Thu, 13 May 2021 20:13:26 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id C03921800BC1; Thu, 13 May 2021 20:13:26 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 14DKCro8021464 for ; Thu, 13 May 2021 16:12:53 -0400 Received: by smtp.corp.redhat.com (Postfix) id 20F6A2157FD7; Thu, 13 May 2021 20:12:53 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast05.extmail.prod.ext.rdu2.redhat.com [10.11.55.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1C6582157FD4 for ; Thu, 13 May 2021 20:12:49 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-2.mimecast.com [205.139.110.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id AFCE883395B for ; Thu, 13 May 2021 20:12:49 +0000 (UTC) Received: from sonic317-38.consmr.mail.ne1.yahoo.com (sonic317-38.consmr.mail.ne1.yahoo.com [66.163.184.49]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-38-GY0nzlBGPdKOhQl0zsjkHQ-1; Thu, 13 May 2021 16:12:47 -0400 X-MC-Unique: GY0nzlBGPdKOhQl0zsjkHQ-1 X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1620936766; bh=tEAjkkTzf9hkTGPbh8mdDK6q/4dxkK9cvxYj2wxIlJI=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=VWB6MCYCCCMY28WkQXgTrB0wx7G46dHfsLlDL6RDPSSD31A8fYfJOPx2iXbQT5wXlmgFaoxrD6Vr5vulbfgx2uUH/FzOgDjXpNVDwa+MQDl9ouqCoy6XqXFKeWnRHktjtUV218WV7lRg9Lvn84brcxpqVeJ1sXi+6L+/M72gNl51tQvzGBH8AoG57CL+n8K1Pcq5aqqMSDRqCsjlbxPw/m/cCKRM5K4cK+NSwqXtnYYAHdup1CFD4CSR3Z6A1X0HPy0TtyegaCdsjUjCp/hfCpzuVT4MZg2cb1CjS13Is7IooutR+zRMZbHAsH0uzMM9PG6kAD2FSbITrpopffFbvQ== X-YMail-OSG: 9kXz4IwVM1lE1GhB.wvWjJgckIFxM_gPc9AYuONZkMGTRzYpOWQYGtAAUYsKzH2 TMgqqPM0ZTF0AeDFmG0oIclSJ3d.BGTJaPsaygYuoekw5BgnRvDbFPFzu_3Qd8djSCgyee4UvpJJ YMfGXW0KAcqXv_rE026aSKmgkzs6F4ndAN4ImdTiI2FP5CK47qKaiL0ynxxfHPeUPZ91d4ZmIkau hKsUfOHRqwbZJZiB7ZNOXKC32HIHT0HGfRqX6lKT3Th2HYw_gvzPNs7NqnGoFAL6gthp1iQb5COb SfALF66dmJubwGDISyIbmfkRcYLaKnsJ_4q2aV_urpfSBy.VoAYoh_MRflD1H86CHwDDbr9_oAhg zlFrFLzm0iQQr_BEfh69qAf4nvYckFUsxDxIZ7TkjaJkXkC4_DhwnNVkJhFLQdTnZFsDGK32y7_1 6GVTBiEzWX4v3H1TGaSoImLogjwNEwGUhLlfcGfktDI9DgzGh5Vab69PjfkFJtrzVZD2LtI.w0xo MsJ4Aa9LcRbmvR01Cx3i_LpMs9MjebdHTjQZcSRPkX7SVbLS7FVk8GWVZbZM7fSG_PzZgCpdpAW1 98Au5CBxkZkje94Xn73NKLCL8kPDgXWbGwOQSG8EetFEIfvRjXxoiuNA35TCfm42Q1A7OK.SQJNw jbz9BT31kJwCFFDt6.WZUQrYg1NF6od_DLBZ7Tc0ALmf_ZFk1Naej1ZuiguZTxwY8ZmGq_HgDB_X 4G2whssJpkzMawQ0pcW6W9BbJol9jEff1xdZz4yt1gVQnh7JUDch4fFXzIyp_K_cf_wk_f5DdmVv PO9E.faL_yVsOVQ27dxOMOjLArRosxHQnb5TpN3ID6NM.qZEoFIc1b6OCsVDRQcBoiVAJ0NoKgfm 7OsYaaA90VrWiw3rb.TtDI95m6m2B4jc7.Gl8.0roRbu8VadUlMpPeA9WhVZrwUNr1q8MFoxVeDu a3ZZsxUy73HPuNDMN8ukcRiyEZkHrTP6eM3VvcrBdzJnFTGAYlXzigHXcrtXEN.RvtiHeAoAV4KJ YIQNRF6Nta0Kkl6Kg.0uBoXB7SooIahWXyq6ybgUT455k_kOvM75qlRQZeVui66rHUSrvnpxIqHP GHLVJBcu5f5m1InF5N7wR4Tnm2uKMR235.AiV7__W_ie_OF3FOfBtVEW0UioYmiPFIogdmbHRhhx ewZNEYygSaqrS4IPflNz8CYA6iI7eo4FrjH84h09u8MTA1dfEiohGtj2TQHNJ9RMuea9JA9_gIQb VI.HDCruk2dY9_zr9VNSfVQ75cSXY_MX7ydVv7Kn6TmeFsR8ykE7MoBUQEZANFTBM6bgBYGulbZ0 7LEGc1Kjq1yZWvFGPdNJDyEG0XmPcGSUeqOOkTDHdz6xZSw5KMGW4Pj3dul7Mq4ezpsdoqrRSL5s NtKfak6s2t.GhVQo6CneZGLV5PqCfqSIVqXl3MFSh.J5UhpvhLScLPUHFnLs012VgeB2j8Ra71yq QHf9ca0fTuxMJjo5tB4yyMWxoXfcet0YTs2.vjRjDAdpUwNiKX7lsrctnsDGRLsxQ1zd1_vY4qjG RT2GT.C_u2dubmS_okdIqkk5tQYtU7Z4OL.NXb5gp3VdRJKfAj1Sv9r_1Lj36dUFub8xPcy1tcFF S2NyBOKCxgox1469xaVs0qIyhi66Mmb58iv7A8EbcwdC9wduQjoDSoEUw7NGVEsGChzko8GhLp_x z9b57jhURZMBreywz.L8HhmMdD7CjYkr.f0oFKPUNzxC5uMqMuy_hA34UXjQHDlQfaTiMdRGafZi QZXanTXm_ckw1TlBzPvIWyjQMKIvlEkqrmbGwUIneonUNIJQ67JRoW6XC7JCWUEAdZbSybAo9a5n 8qbGJyEm.90wpspq6ZzO50MAyiV2rEz1CQLtTXJ8lrLkhqVTRDUNAPvkw23_6x629NBCW9kfc52H x6Li.Xnv88k8NtMCenCLsYLDXIwPId7h54D_zVUAJf6CUDIikV2Tbd18wT3_TFkv2g6cwV2Ynl3_ stk_37rYmWdhkZ8iFl6gyhKt84zWRlatfm1TS_QNSH_tbIgXCOlLUiJm8zHnR4AOh8DdHoGEL.5x FDjUSt_qh71IokuO1nNUIfLtYh.zMUs_lVbhCHPowwLt_QDNBxX_yvrm_iEFwgIcODdZaGwYys2k BC5OiqII4IGw033haOZ9RDVPa7LMbRgjQ.lYzJxZZsdmFX9cpC194yjY29JGirSSR41.f6.6jCmZ _TqGkdfxBP67xSRzRWrsMrn5aNO52t3YwWfO0hRjtt8l7QKljRT3aMRxCqjpunKJiUBTR3uSI.HU vi3IKxmLW1BuxAJAaVmU_6muvOp5jXbCN6zQstDwC_0dFPWC1xXyzkzMRWC943PW6PYjt9Kow9rS 5zDX6iZMCB6QgVnUOdW.kqbtRneacpFcwfKBJIQ5eM60jE4fW3OSY7LTLcZ4NMTEB98kTbTvjusb 4fsla5XUH4oEErRdZa.S_2cO9RKH9G9uImsfEl8ofQVCAns7TN4T1MEdD61PoUTcGbCZfRKyI40_ 4aFb66SZvz9w9lxPAoXUCpI1f8QSV.88y76zjE_yuCMoLHayUM20w0.wk46CEa67mJvc27aVEuU7 Y2smNuA91EyY3aW9oMJTUPXKWrwA8m2A.1lobXK9uWDt3wZUjiLsAVS9jQQkkQrkyklskMRWVoji jolNDYFJdFyiRaFxcto1T21BIc1ntJxg_CSL7HgrPYoSOZX1SWuLpbygWh5ZHjM7F_iw66yrQGLi zxZOKDeJ3q8Goxbgek4ONPJUCNcX4JUTKI7bvV22hsJISL558AjMYqfhrMGfX8TwQtSLjerIpoMt 48KexM5znbnrTVFJViizCjtbevkysoXhYY4YT5vWFA6uQYk923rjdlIDFt4QCpp7W3d2ov11MbhR ary_dM_PiIErYEM7l_6iumf4DrSlPuTavvcQ9G5rs_k3.WJ4oGf1YZUafy7dPEj924JIXc4TFKDV xHXSCEjkQDAGFTj5dl3J_kSA6BueQX_CjdhfxAjim6DqAqZjyBOtsgwSJgUqMqe1Np1QDe6rjWeF m35pzAZpJ4LFdbcZ8dTedfnFF.T7s63ZLCTGbzjV638FecSnqPB3c.S1RmgwdGCEdWKJ4nVmsn1H bkbmKN6aBaoOMrbxZc2hYX3BEovRa4bBWQB2Fl2MNKgOQ.qhEXgl9PKcI4TQ- X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic317.consmr.mail.ne1.yahoo.com with HTTP; Thu, 13 May 2021 20:12:46 +0000 Received: by kubenode532.mail-prod1.omega.bf1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 2180a90ee2d0cc9936d3029a48cc28ba; Thu, 13 May 2021 20:12:42 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Subject: [PATCH v26 04/25] IMA: avoid label collisions with stacked LSMs Date: Thu, 13 May 2021 13:07:46 -0700 Message-Id: <20210513200807.15910-5-casey@schaufler-ca.com> In-Reply-To: <20210513200807.15910-1-casey@schaufler-ca.com> References: <20210513200807.15910-1-casey@schaufler-ca.com> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-loop: linux-audit@redhat.com Cc: john.johansen@canonical.com, linux-kernel@vger.kernel.org, linux-audit@redhat.com, sds@tycho.nsa.gov X-BeenThere: linux-audit@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Linux Audit Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-audit-bounces@redhat.com Errors-To: linux-audit-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=linux-audit-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Integrity measurement may filter on security module information and needs to be clear in the case of multiple active security modules which applies. Provide a boot option ima_rules_lsm= to allow the user to specify an active securty module to apply filters to. If not specified, use the first registered module that supports the audit_rule_match() LSM hook. Allow the user to specify in the IMA policy an lsm= option to specify the security module to use for a particular rule. Signed-off-by: Casey Schaufler To: Mimi Zohar To: linux-integrity@vger.kernel.org --- Documentation/ABI/testing/ima_policy | 8 ++- security/integrity/ima/ima_policy.c | 77 ++++++++++++++++++++-------- 2 files changed, 62 insertions(+), 23 deletions(-) diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy index 070779e8d836..84dd19bc4344 100644 --- a/Documentation/ABI/testing/ima_policy +++ b/Documentation/ABI/testing/ima_policy @@ -25,7 +25,7 @@ Description: base: [[func=] [mask=] [fsmagic=] [fsuuid=] [uid=] [euid=] [fowner=] [fsname=]] lsm: [[subj_user=] [subj_role=] [subj_type=] - [obj_user=] [obj_role=] [obj_type=]] + [obj_user=] [obj_role=] [obj_type=] [lsm=]] option: [[appraise_type=]] [template=] [permit_directio] [appraise_flag=] [keyrings=] base: @@ -117,6 +117,12 @@ Description: measure subj_user=_ func=FILE_CHECK mask=MAY_READ + It is possible to explicitly specify which security + module a rule applies to using lsm=. If the security + modules specified is not active on the system the rule + will be rejected. If lsm= is not specified the first + security module registered on the system will be assumed. + Example of measure rules using alternate PCRs:: measure func=KEXEC_KERNEL_CHECK pcr=4 diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 5c40677e881c..d804b9a0dd95 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -79,8 +79,9 @@ struct ima_rule_entry { bool (*uid_op)(kuid_t, kuid_t); /* Handlers for operators */ bool (*fowner_op)(kuid_t, kuid_t); /* uid_eq(), uid_gt(), uid_lt() */ int pcr; + int which_lsm; /* which of the rules to use */ struct { - void *rules[LSMBLOB_ENTRIES]; /* LSM file metadata specific */ + void *rule; /* LSM file metadata specific */ char *args_p; /* audit value */ int type; /* audit type */ } lsm[MAX_LSM_RULES]; @@ -92,17 +93,15 @@ struct ima_rule_entry { /** * ima_lsm_isset - Is a rule set for any of the active security modules - * @rules: The set of IMA rules to check + * @entry: the rule entry to examine + * @lsm_rule: the specific rule type in question * - * If a rule is set for any LSM return true, otherwise return false. + * If a rule is set return true, otherwise return false. */ -static inline bool ima_lsm_isset(void *rules[]) +static inline bool ima_lsm_isset(struct ima_rule_entry *entry, int lsm_rule) { - int i; - - for (i = 0; i < LSMBLOB_ENTRIES; i++) - if (rules[i]) - return true; + if (entry->lsm[lsm_rule].rule) + return true; return false; } @@ -282,6 +281,20 @@ static int __init default_appraise_policy_setup(char *str) } __setup("ima_appraise_tcb", default_appraise_policy_setup); +static int ima_rules_lsm __ro_after_init; + +static int __init ima_rules_lsm_init(char *str) +{ + ima_rules_lsm = lsm_name_to_slot(str); + if (ima_rules_lsm < 0) { + ima_rules_lsm = 0; + pr_err("rule lsm \"%s\" not registered", str); + } + + return 1; +} +__setup("ima_rules_lsm=", ima_rules_lsm_init); + static struct ima_rule_opt_list *ima_alloc_rule_opt_list(const substring_t *src) { struct ima_rule_opt_list *opt_list; @@ -351,11 +364,10 @@ static void ima_free_rule_opt_list(struct ima_rule_opt_list *opt_list) static void ima_lsm_free_rule(struct ima_rule_entry *entry) { int i; - int r; for (i = 0; i < MAX_LSM_RULES; i++) { - for (r = 0; r < LSMBLOB_ENTRIES; r++) - ima_filter_rule_free(entry->lsm[i].rules[r]); + if (entry->lsm[i].rule) + ima_filter_rule_free(entry->lsm[i].rule); kfree(entry->lsm[i].args_p); } } @@ -406,8 +418,8 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry) ima_filter_rule_init(nentry->lsm[i].type, Audit_equal, nentry->lsm[i].args_p, - &nentry->lsm[i].rules[0]); - if (!ima_lsm_isset(nentry->lsm[i].rules)) + &nentry->lsm[i].rule); + if (!ima_lsm_isset(nentry, i)) pr_warn("rule for LSM \'%s\' is undefined\n", nentry->lsm[i].args_p); } @@ -596,7 +608,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, int rc = 0; u32 osid; - if (!ima_lsm_isset(rule->lsm[i].rules)) { + if (!ima_lsm_isset(rule, i)) { if (!rule->lsm[i].args_p) continue; else @@ -609,14 +621,14 @@ static bool ima_match_rules(struct ima_rule_entry *rule, security_inode_getsecid(inode, &osid); rc = ima_filter_rule_match(osid, rule->lsm[i].type, Audit_equal, - rule->lsm[i].rules); + rule->lsm[i].rule); break; case LSM_SUBJ_USER: case LSM_SUBJ_ROLE: case LSM_SUBJ_TYPE: rc = ima_filter_rule_match(secid, rule->lsm[i].type, Audit_equal, - rule->lsm[i].rules); + rule->lsm[i].rule); break; default: break; @@ -966,7 +978,7 @@ enum { Opt_uid_lt, Opt_euid_lt, Opt_fowner_lt, Opt_appraise_type, Opt_appraise_flag, Opt_permit_directio, Opt_pcr, Opt_template, Opt_keyrings, - Opt_label, Opt_err + Opt_lsm, Opt_label, Opt_err }; static const match_table_t policy_tokens = { @@ -1004,6 +1016,7 @@ static const match_table_t policy_tokens = { {Opt_template, "template=%s"}, {Opt_keyrings, "keyrings=%s"}, {Opt_label, "label=%s"}, + {Opt_lsm, "lsm=%s"}, {Opt_err, NULL} }; @@ -1012,7 +1025,7 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry, { int result; - if (ima_lsm_isset(entry->lsm[lsm_rule].rules)) + if (ima_lsm_isset(entry, lsm_rule)) return -EINVAL; entry->lsm[lsm_rule].args_p = match_strdup(args); @@ -1022,8 +1035,8 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry, entry->lsm[lsm_rule].type = audit_type; result = ima_filter_rule_init(entry->lsm[lsm_rule].type, Audit_equal, entry->lsm[lsm_rule].args_p, - &entry->lsm[lsm_rule].rules[0]); - if (!ima_lsm_isset(entry->lsm[lsm_rule].rules)) { + &entry->lsm[lsm_rule].rule); + if (!ima_lsm_isset(entry, lsm_rule)) { pr_warn("rule for LSM \'%s\' is undefined\n", entry->lsm[lsm_rule].args_p); @@ -1561,6 +1574,19 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) &(template_desc->num_fields)); entry->template = template_desc; break; + case Opt_lsm: + result = lsm_name_to_slot(args[0].from); + if (result == LSMBLOB_INVALID) { + int i; + + for (i = 0; i < MAX_LSM_RULES; i++) + entry->lsm[i].args_p = NULL; + result = -EINVAL; + break; + } + entry->which_lsm = result; + result = 0; + break; case Opt_err: ima_log_string(ab, "UNKNOWN", p); result = -EINVAL; @@ -1597,6 +1623,7 @@ ssize_t ima_parse_add_rule(char *rule) struct ima_rule_entry *entry; ssize_t result, len; int audit_info = 0; + int i; p = strsep(&rule, "\n"); len = strlen(p) + 1; @@ -1614,6 +1641,9 @@ ssize_t ima_parse_add_rule(char *rule) INIT_LIST_HEAD(&entry->list); + for (i = 0; i < MAX_LSM_RULES; i++) + entry->which_lsm = ima_rules_lsm; + result = ima_parse_rule(p, entry); if (result) { ima_free_rule(entry); @@ -1830,7 +1860,7 @@ int ima_policy_show(struct seq_file *m, void *v) } for (i = 0; i < MAX_LSM_RULES; i++) { - if (ima_lsm_isset(entry->lsm[i].rules)) { + if (ima_lsm_isset(entry, i)) { switch (i) { case LSM_OBJ_USER: seq_printf(m, pt(Opt_obj_user), @@ -1872,6 +1902,9 @@ int ima_policy_show(struct seq_file *m, void *v) seq_puts(m, "appraise_flag=check_blacklist "); if (entry->flags & IMA_PERMIT_DIRECTIO) seq_puts(m, "permit_directio "); + if (entry->which_lsm >= 0) + seq_printf(m, pt(Opt_lsm), + lsm_slot_to_name(entry->which_lsm)); rcu_read_unlock(); seq_puts(m, "\n"); return 0; -- 2.29.2 -- Linux-audit mailing list Linux-audit@redhat.com https://listman.redhat.com/mailman/listinfo/linux-audit