From patchwork Wed Jan 3 01:20:17 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Garrett X-Patchwork-Id: 10141563 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0408860638 for ; Wed, 3 Jan 2018 01:20:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EB27828EC2 for ; Wed, 3 Jan 2018 01:20:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DE7B628ED3; Wed, 3 Jan 2018 01:20:29 +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=-6.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, RCVD_IN_DNSWL_HI, T_DKIM_INVALID 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 03E2A28ED2 for ; Wed, 3 Jan 2018 01:20:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751007AbeACBU2 (ORCPT ); Tue, 2 Jan 2018 20:20:28 -0500 Received: from mail-oi0-f73.google.com ([209.85.218.73]:44840 "EHLO mail-oi0-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751001AbeACBU0 (ORCPT ); Tue, 2 Jan 2018 20:20:26 -0500 Received: by mail-oi0-f73.google.com with SMTP id s16so86679oih.11 for ; Tue, 02 Jan 2018 17:20:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:date:in-reply-to:message-id:references:subject:from:to :cc; bh=3Qjg12n+dUIelWc0bFDDeCdicrCS0uFUqcMRe5Etgxg=; b=VDKKSDxZvXNErDSbFopdS9MJ5LfvqHeFLgSGE5Nw/uYyZPOh54aiWG1/8BKoHOn5pI 0J+eWaTTWCiS0oHzyFBkP4fhGphYdeZ830JyMMeJfadGyrzGWgOok4hebydeIXIgIT+D 5zMC/mBhhYOKqg9uvRQmMHJ2gKJbZj9DYgjcdMZHUoanN5wlROgnIyEeifKUV2O5rKPD OGX54jj/9dmEAIPI2o30XZAsMuJy6lUXFJNgvC9mjC2LrTMkC31viHVGsgvQ9UWHlU3T zubjG1kHDjvTYOfbLUHHQ4fC2yEP0D4V1Gqww52GN2HIDvTSzrOEduy1iNFL0zpuwANJ Hu6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id :references:subject:from:to:cc; bh=3Qjg12n+dUIelWc0bFDDeCdicrCS0uFUqcMRe5Etgxg=; b=pZ8eDDUX6S4WozpxxtqH7Bs/KA1eHKoPTLe+bw57TNAS7myLmqiMYscE2qolBkZNzf 2Yp59G2I8klYjeUh3pALKi4A7ZMXMPxLzEq8+/Adw+axBcD0MoM5qLY2jXMSPAhWdipw VjUeRi1scah/9K1Bd5WppFALVPbZKR/45sMiEkgZmCWlk0QcjXuZhhyRNIfcBIoN143N eJ/NCslSxvIqTnQaLGhth3xSh5w7yH2kHUeVDjrvpsDlb1cKwMLIe2UVUifZ37wSQz+f dEqfROOABnDoM2lOuPJd1aLmfqx6p53g193xQJqI42JuBKP1IeqchmNj1mRjMrCqrgMP XpqQ== X-Gm-Message-State: AKGB3mKL/TzpD3ccw2LyC0YLkb/APIREUK/rBhbNZGj5DHa2ldokIf+o MDyxIZFjAUhPgglrvivA8FCbKgSVwCOO8MDDhQekIg== X-Google-Smtp-Source: ACJfBoum+6ZiealpUO3qnJ5jstzPrgtmtrBdgWx536NF6qtIGwcxx3GkU9S1lp/BvSXbl1IPN1N6o47Q07mZE0cLuz+7pw== MIME-Version: 1.0 X-Received: by 10.157.42.8 with SMTP id t8mr24338140ota.75.1514942426327; Tue, 02 Jan 2018 17:20:26 -0800 (PST) Date: Tue, 2 Jan 2018 17:20:17 -0800 In-Reply-To: <20180103012017.7022-1-mjg59@google.com> Message-Id: <20180103012017.7022-3-mjg59@google.com> References: <20180103012017.7022-1-mjg59@google.com> X-Mailer: git-send-email 2.15.1.620.gb9897f4670-goog Subject: [PATCH V4 3/3] IMA: Support using new creds in appraisal policy From: Matthew Garrett To: linux-integrity@vger.kernel.org Cc: Matthew Garrett , Paul Moore , Stephen Smalley , Eric Paris , selinux@tycho.nsa.gov, Casey Schaufler , linux-security-module@vger.kernel.org, Mimi Zohar , Dmitry Kasatkin Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP The existing BPRM_CHECK functionality in IMA validates against the credentials of the existing process, not any new credentials that the child process may transition to. Add an additional CREDS_CHECK target and refactor IMA to pass the appropriate creds structure. In ima_bprm_check(), check with both the existing process credentials and the credentials that will be committed when the new process is started. This will not change behaviour unless the system policy is extended to include CREDS_CHECK targets - BPRM_CHECK will continue to check the same credentials that it did previously. Signed-off-by: Matthew Garrett Cc: Paul Moore Cc: Stephen Smalley Cc: Eric Paris Cc: selinux@tycho.nsa.gov Cc: Casey Schaufler Cc: linux-security-module@vger.kernel.org Cc: Mimi Zohar Cc: Dmitry Kasatkin Cc: linux-integrity@vger.kernel.org --- Documentation/ABI/testing/ima_policy | 2 +- security/integrity/iint.c | 1 + security/integrity/ima/ima.h | 7 ++++--- security/integrity/ima/ima_api.c | 8 +++++--- security/integrity/ima/ima_appraise.c | 10 +++++++++- security/integrity/ima/ima_main.c | 26 +++++++++++++++++--------- security/integrity/ima/ima_policy.c | 16 +++++++++++----- security/integrity/integrity.h | 9 +++++++-- 8 files changed, 55 insertions(+), 24 deletions(-) diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy index e76432b9954d..5dc9eed035fb 100644 --- a/Documentation/ABI/testing/ima_policy +++ b/Documentation/ABI/testing/ima_policy @@ -25,7 +25,7 @@ Description: [obj_user=] [obj_role=] [obj_type=]] option: [[appraise_type=]] [permit_directio] - base: func:= [BPRM_CHECK][MMAP_CHECK][FILE_CHECK][MODULE_CHECK] + base: func:= [BPRM_CHECK][MMAP_CHECK][CREDS_CHECK][FILE_CHECK][MODULE_CHECK] [FIRMWARE_CHECK] [KEXEC_KERNEL_CHECK] [KEXEC_INITRAMFS_CHECK] mask:= [[^]MAY_READ] [[^]MAY_WRITE] [[^]MAY_APPEND] diff --git a/security/integrity/iint.c b/security/integrity/iint.c index c84e05866052..62846e331a8b 100644 --- a/security/integrity/iint.c +++ b/security/integrity/iint.c @@ -78,6 +78,7 @@ static void iint_free(struct integrity_iint_cache *iint) iint->ima_mmap_status = INTEGRITY_UNKNOWN; iint->ima_bprm_status = INTEGRITY_UNKNOWN; iint->ima_read_status = INTEGRITY_UNKNOWN; + iint->ima_creds_status = INTEGRITY_UNKNOWN; iint->evm_status = INTEGRITY_UNKNOWN; iint->measured_pcrs = 0; kmem_cache_free(iint_cache, iint); diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index d52b487ad259..0703a96072b5 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -177,6 +177,7 @@ static inline unsigned long ima_hash_key(u8 *digest) hook(FILE_CHECK) \ hook(MMAP_CHECK) \ hook(BPRM_CHECK) \ + hook(CREDS_CHECK) \ hook(POST_SETATTR) \ hook(MODULE_CHECK) \ hook(FIRMWARE_CHECK) \ @@ -191,7 +192,7 @@ enum ima_hooks { }; /* LIM API function definitions */ -int ima_get_action(struct inode *inode, int mask, +int ima_get_action(struct inode *inode, const struct cred *cred, int mask, enum ima_hooks func, int *pcr); int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func); int ima_collect_measurement(struct integrity_iint_cache *iint, @@ -212,8 +213,8 @@ void ima_free_template_entry(struct ima_template_entry *entry); const char *ima_d_path(const struct path *path, char **pathbuf, char *filename); /* IMA policy related functions */ -int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, - int flags, int *pcr); +int ima_match_policy(struct inode *inode, const struct cred *cred, + enum ima_hooks func, int mask, int flags, int *pcr); void ima_init_policy(void); void ima_update_policy(void); void ima_update_policy_flag(void); diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index c7e8db0ea4c0..42ccc2dd3c34 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -157,6 +157,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename, /** * ima_get_action - appraise & measure decision based on policy. * @inode: pointer to inode to measure + * @cred: pointer to credentials structure to validate * @mask: contains the permission mask (MAY_READ, MAY_WRITE, MAY_EXEC, * MAY_APPEND) * @func: caller identifier @@ -165,20 +166,21 @@ void ima_add_violation(struct file *file, const unsigned char *filename, * The policy is defined in terms of keypairs: * subj=, obj=, type=, func=, mask=, fsmagic= * subj,obj, and type: are LSM specific. - * func: FILE_CHECK | BPRM_CHECK | MMAP_CHECK | MODULE_CHECK + * func: FILE_CHECK | BPRM_CHECK | CREDS_CHECK | MMAP_CHECK | MODULE_CHECK * mask: contains the permission mask * fsmagic: hex value * * Returns IMA_MEASURE, IMA_APPRAISE mask. * */ -int ima_get_action(struct inode *inode, int mask, enum ima_hooks func, int *pcr) +int ima_get_action(struct inode *inode, const struct cred *cred, int mask, + enum ima_hooks func, int *pcr) { int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE; flags &= ima_policy_flag; - return ima_match_policy(inode, func, mask, flags, pcr); + return ima_match_policy(inode, cred, func, mask, flags, pcr); } /* diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 65fbcf3c32c7..1b56ee949315 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -53,7 +53,8 @@ int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func) if (!ima_appraise) return 0; - return ima_match_policy(inode, func, mask, IMA_APPRAISE, NULL); + return ima_match_policy(inode, current_cred(), func, mask, + IMA_APPRAISE, NULL); } static int ima_fix_xattr(struct dentry *dentry, @@ -86,6 +87,8 @@ enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, return iint->ima_mmap_status; case BPRM_CHECK: return iint->ima_bprm_status; + case CREDS_CHECK: + return iint->ima_creds_status; case FILE_CHECK: case POST_SETATTR: return iint->ima_file_status; @@ -106,6 +109,8 @@ static void ima_set_cache_status(struct integrity_iint_cache *iint, case BPRM_CHECK: iint->ima_bprm_status = status; break; + case CREDS_CHECK: + iint->ima_creds_status = status; case FILE_CHECK: case POST_SETATTR: iint->ima_file_status = status; @@ -127,6 +132,9 @@ static void ima_cache_flags(struct integrity_iint_cache *iint, case BPRM_CHECK: iint->flags |= (IMA_BPRM_APPRAISED | IMA_APPRAISED); break; + case CREDS_CHECK: + iint->flags |= (IMA_CREDS_APPRAISED | IMA_APPRAISED); + break; case FILE_CHECK: case POST_SETATTR: iint->flags |= (IMA_FILE_APPRAISED | IMA_APPRAISED); diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 770654694efc..c7db078d6a19 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -159,8 +159,9 @@ void ima_file_free(struct file *file) ima_check_last_writer(iint, inode, file); } -static int process_measurement(struct file *file, char *buf, loff_t size, - int mask, enum ima_hooks func, int opened) +static int process_measurement(struct file *file, const struct cred *cred, + char *buf, loff_t size, int mask, + enum ima_hooks func, int opened) { struct inode *inode = file_inode(file); struct integrity_iint_cache *iint = NULL; @@ -182,7 +183,7 @@ static int process_measurement(struct file *file, char *buf, loff_t size, * bitmask based on the appraise/audit/measurement policy. * Included is the appraise submask. */ - action = ima_get_action(inode, mask, func, &pcr); + action = ima_get_action(inode, cred, mask, func, &pcr); violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) && (ima_policy_flag & IMA_MEASURE)); if (!action && !violation_check) @@ -285,8 +286,8 @@ static int process_measurement(struct file *file, char *buf, loff_t size, int ima_file_mmap(struct file *file, unsigned long prot) { if (file && (prot & PROT_EXEC)) - return process_measurement(file, NULL, 0, MAY_EXEC, - MMAP_CHECK, 0); + return process_measurement(file, current_cred(), NULL, 0, + MAY_EXEC, MMAP_CHECK, 0); return 0; } @@ -305,8 +306,14 @@ int ima_file_mmap(struct file *file, unsigned long prot) */ int ima_bprm_check(struct linux_binprm *bprm) { - return process_measurement(bprm->file, NULL, 0, MAY_EXEC, - BPRM_CHECK, 0); + int ret; + + ret = process_measurement(bprm->file, current_cred(), NULL, 0, + MAY_EXEC, BPRM_CHECK, 0); + if (ret) + return ret; + return process_measurement(bprm->file, bprm->cred, NULL, 0, + MAY_EXEC, CREDS_CHECK, 0); } /** @@ -321,7 +328,7 @@ int ima_bprm_check(struct linux_binprm *bprm) */ int ima_file_check(struct file *file, int mask, int opened) { - return process_measurement(file, NULL, 0, + return process_measurement(file, current_cred(), NULL, 0, mask & (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND), FILE_CHECK, opened); } @@ -420,7 +427,8 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size, } func = read_idmap[read_id] ?: FILE_CHECK; - return process_measurement(file, buf, size, MAY_READ, func, 0); + return process_measurement(file, current_cred(), buf, size, MAY_READ, + func, 0); } static int __init init_ima(void) diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 52951ac445ea..cd2289daacee 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -247,9 +247,9 @@ static void ima_lsm_update_rules(void) * Returns true on rule match, false on failure. */ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode, - enum ima_hooks func, int mask) + const struct cred *cred, enum ima_hooks func, + int mask) { - const struct cred *cred = current_cred(); int i; if ((rule->flags & IMA_FUNC) && @@ -338,6 +338,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func) return IMA_MMAP_APPRAISE; case BPRM_CHECK: return IMA_BPRM_APPRAISE; + case CREDS_CHECK: + return IMA_CREDS_APPRAISE; case FILE_CHECK: case POST_SETATTR: return IMA_FILE_APPRAISE; @@ -350,6 +352,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func) /** * ima_match_policy - decision based on LSM and other conditions * @inode: pointer to an inode for which the policy decision is being made + * @cred: pointer to a credentials structure for which the policy decision is + * being made * @func: IMA hook identifier * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC) * @pcr: set the pcr to extend @@ -361,8 +365,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func) * list when walking it. Reads are many orders of magnitude more numerous * than writes so ima_match_policy() is classical RCU candidate. */ -int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, - int flags, int *pcr) +int ima_match_policy(struct inode *inode, const struct cred *cred, + enum ima_hooks func, int mask, int flags, int *pcr) { struct ima_rule_entry *entry; int action = 0, actmask = flags | (flags << 1); @@ -373,7 +377,7 @@ int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask, if (!(entry->action & actmask)) continue; - if (!ima_match_rules(entry, inode, func, mask)) + if (!ima_match_rules(entry, inode, cred, func, mask)) continue; action |= entry->flags & IMA_ACTION_FLAGS; @@ -690,6 +694,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) entry->func = MMAP_CHECK; else if (strcmp(args[0].from, "BPRM_CHECK") == 0) entry->func = BPRM_CHECK; + else if (strcmp(args[0].from, "CREDS_CHECK") == 0) + entry->func = CREDS_CHECK; else if (strcmp(args[0].from, "KEXEC_KERNEL_CHECK") == 0) entry->func = KEXEC_KERNEL_CHECK; diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index e1bf040fb110..d70fd875d62f 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -48,10 +48,14 @@ #define IMA_BPRM_APPRAISED 0x00002000 #define IMA_READ_APPRAISE 0x00004000 #define IMA_READ_APPRAISED 0x00008000 +#define IMA_CREDS_APPRAISE 0x00010000 +#define IMA_CREDS_APPRAISED 0x00020000 #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \ - IMA_BPRM_APPRAISE | IMA_READ_APPRAISE) + IMA_BPRM_APPRAISE | IMA_READ_APPRAISE | \ + IMA_CREDS_APPRAISE) #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \ - IMA_BPRM_APPRAISED | IMA_READ_APPRAISED) + IMA_BPRM_APPRAISED | IMA_READ_APPRAISED | \ + IMA_CREDS_APPRAISED) enum evm_ima_xattr_type { IMA_XATTR_DIGEST = 0x01, @@ -108,6 +112,7 @@ struct integrity_iint_cache { enum integrity_status ima_mmap_status:4; enum integrity_status ima_bprm_status:4; enum integrity_status ima_read_status:4; + enum integrity_status ima_creds_status:4; enum integrity_status evm_status:4; struct ima_digest_data *ima_hash; };