From patchwork Fri Jul 24 20:32:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 11684383 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 CFC8813B6 for ; Fri, 24 Jul 2020 20:54:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B3110206F6 for ; Fri, 24 Jul 2020 20:54:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=yahoo.com header.i=@yahoo.com header.b="akiILIdO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726658AbgGXUy7 (ORCPT ); Fri, 24 Jul 2020 16:54:59 -0400 Received: from sonic317-32.consmr.mail.bf2.yahoo.com ([74.6.129.87]:40524 "EHLO sonic317-32.consmr.mail.bf2.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726607AbgGXUy7 (ORCPT ); Fri, 24 Jul 2020 16:54:59 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1595624092; bh=k1azetAr+Gnr0hom6tcW0DzwFUtFWi+9CR9qWqGEVwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject; b=akiILIdOoA29MkDr6XSo3fkL3Kc4MlexBBVuDR11KcS1K2Yblnb1eB0vd3dvIuGaQZQUhphRYIHrIhQZWnQRbcLhk7wpZ3onmQ1mcrTZtzbaRqSmDRo4Q2pxXMFe/qZ7rETd1rjaYjO1cNEAi5AyMVV2tcfz8InyIJkiEJPJr+fuIEcoesYhf+iybcZjnlGYO18vkmHK7B0cxtqhde/pnLxPRvCLsGG53MFRIzPWJ8VwgcmT0d5fqNE+BIe9Le2brZRny6sJKq+XiNRVO/QWTQVqO25aHXIJVaX5OEvKPZYVutisQoddJkt+Defcvf8W8b5+YoW9kHw7caPsFxAGfQ== X-YMail-OSG: hcbi8FIVM1l0I1lXcjLy40QVaUd1FboBz6P6kL4VMxGYUlIgiqRfM4eGWD_igOm c22UoQDeFN8fj4KhIsTMhmsC52gMOqEeQfRRQ6GtaaQMH3_iyW2plareT.w5F4Qce6DYCtRdubhp SFK8zCKulJbqwutB9HzFhpSZOPrmzKgFkNm2ZdN_au3pZ0IqkoAIvKqTDvBhM4DGEe_Rc96S5JLI DivFNGKxP9MnV42ndcoW1Z.Fr7VYgvo2yQV.fIQk_mTc7XuTb88fwv4N6cgtXX1ml9RNzaECVWKe GswApHnqqQZCwd8VO0VrvY4bMxj9ZeDYBGXuI04vWdYVrEFaxmVSumKuy_hBPA83lEjVDPO4CjZ5 CHrS5kouaJS6_LslJDCuhVNgFJIKr1gUjwXHAxBDqkqcTxdWM556GhFNOeZONmeVu2YWyx5EWYMX 1w_CpFzcuv4AvDghth4Jx1dthqSKkLD8ta_scBRbK.D4PzwZ1S0Ct8XUHpbQ6Z7032xRvjYRg94a KJZLyTGAjw0ETtMEhWmAoyj79YN1za6jpbQ9mQ8RgWCdYmjqyzNJIAyuZUdqFzIQQ.84s_0Esnj3 d4Mt7z1Vdq89V2rucR77xBaGeOxO3e5XBqfRduXWPlk2a2Wl6LOyM_qyWX8U0xPuyO3nC8Mjfrwa lU90oeIbTnJJR5vtPOnrMHak2IN3ehKhwCFFGs85NxslPVR7ihV4sOoSr5uMwcelX9YU8hBW.9.g lmANdd9n3n2ENWz5Kyi6wyr8GWM2bDkTSzEa_VxSDVNahNR_vxgDNYmLMJThk6T3hHlq67gvAEfz rzNDxMmoDW_.QIMJxpMQGfsfnYTLBfxxhTKGNRDY61gwlaSxzTBdJNUUYQKABLMz8N6a4LAn0Qy7 fvgVHGH1mpzEv_4umSxmOSp.LjroqgHgS7Ka8ID2Dq9njC0CdAeYaXnQWGRwsiCEux_YRz129H1c 4b4IqeXty9ujUQNFAPn7.9pFnhcL9dHHS48tRfronH5LVnq7FP2JRrr0Db0tvoRkNIRRwi5Mdc65 7gxuIf7rVP70uTSz3YueKz4OvqksHNiH1x6sZLfVz7Gj_jr8whQHYLOqHORU1xSKs1CdptpXq_48 CkEcXgpjFo1qiZ9aZF1K7BMSP80ZOKxPrG3ha.eAI7N2AI0jjTHHnmI8eYnw3xdLpNcJkbU31dmb 7c2GQfLqjbOq6KKcP3Jtgqo6NdbQSjh_uVDE0KOtl2C.d2uwQ7Kxk4jqo3LSczZokWP2bcM5.H9h wNkTXkXjBcl93_XkDb2V23gbw6Uz0qgP9fvaDf4yp2xWyU4203EcrNBdjcBcZ0bSmiJWRPNusNV. pfaRPopdM4pWLBlP03jwSKd83d6IhV1pM4dhodtbIoHBxHwlOaD9N4Y_6oVp6WcNUz40gDMoIhbf H1Km7m0v3LL06wDNp5byCYRAuDp63Wu7uKN8tiXY- Received: from sonic.gate.mail.ne1.yahoo.com by sonic317.consmr.mail.bf2.yahoo.com with HTTP; Fri, 24 Jul 2020 20:54:52 +0000 Received: by smtp401.mail.gq1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 89227888bcbfc3b662eb0a93772593fb; Fri, 24 Jul 2020 20:54:47 +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 Subject: [PATCH v19 20/23] Audit: Add new record for multiple process LSM attributes Date: Fri, 24 Jul 2020 13:32:23 -0700 Message-Id: <20200724203226.16374-21-casey@schaufler-ca.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200724203226.16374-1-casey@schaufler-ca.com> References: <20200724203226.16374-1-casey@schaufler-ca.com> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Create a new audit record type to contain the subject information when there are multiple security modules that require such data. This record is linked with the same timestamp and serial number. The record is produced only in cases where there is more than one security module with a process "context". Before this change the only audit events that required multiple records were syscall events. Several non-syscall events include subject contexts, so the use of audit_context data has been expanded as necessary. Signed-off-by: Casey Schaufler Cc: linux-audit@redhat.com --- drivers/android/binder.c | 2 +- include/linux/audit.h | 13 +++- include/linux/security.h | 18 ++++- include/net/netlabel.h | 2 +- include/net/scm.h | 3 +- include/net/xfrm.h | 4 +- include/uapi/linux/audit.h | 1 + kernel/audit.c | 90 ++++++++++++++++++------- kernel/auditfilter.c | 2 +- kernel/auditsc.c | 87 ++++++++++++++++++++++-- net/ipv4/ip_sockglue.c | 2 +- net/netfilter/nf_conntrack_netlink.c | 4 +- net/netfilter/nf_conntrack_standalone.c | 2 +- net/netfilter/nfnetlink_queue.c | 2 +- net/netlabel/netlabel_unlabeled.c | 16 ++--- net/netlabel/netlabel_user.c | 12 ++-- net/netlabel/netlabel_user.h | 6 +- security/integrity/integrity_audit.c | 2 +- security/security.c | 71 ++++++++++++++----- security/smack/smackfs.c | 3 +- 20 files changed, 259 insertions(+), 83 deletions(-) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index ceb5987c7d76..99b1e65b193c 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3109,7 +3109,7 @@ static void binder_transaction(struct binder_proc *proc, size_t added_size; security_task_getsecid(proc->tsk, &blob); - ret = security_secid_to_secctx(&blob, &lsmctx); + ret = security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_DISPLAY); if (ret) { return_error = BR_FAILED_REPLY; return_error_param = ret; diff --git a/include/linux/audit.h b/include/linux/audit.h index aabbbe6d9296..4693febcf41f 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -168,7 +168,9 @@ extern void audit_log_path_denied(int type, const char *operation); extern void audit_log_lost(const char *message); -extern int audit_log_task_context(struct audit_buffer *ab); +extern void audit_log_lsm(struct lsmblob *blob, bool exiting); +extern int audit_log_task_context(struct audit_buffer *ab, + struct lsmblob *blob); extern void audit_log_task_info(struct audit_buffer *ab); extern int audit_update_lsm_rules(void); @@ -228,7 +230,10 @@ 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 int audit_log_task_context(struct audit_buffer *ab) +static inline void audit_log_lsm(struct lsmblob *blob, bool exiting) +{ } +static inline int audit_log_task_context(struct audit_buffer *ab, + struct lsmblob *blob); { return 0; } @@ -287,6 +292,7 @@ extern void audit_seccomp(unsigned long syscall, long signr, int code); extern void audit_seccomp_actions_logged(const char *names, const char *old_names, int res); extern void __audit_ptrace(struct task_struct *t); +extern void audit_stamp_context(struct audit_context *ctx); static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx) { @@ -665,6 +671,9 @@ static inline void audit_ntp_log(const struct audit_ntp_data *ad) static inline void audit_ptrace(struct task_struct *t) { } +static inline void audit_stamp_context(struct audit_context *ctx) +{ } + static inline void audit_log_nfcfg(const char *name, u8 af, unsigned int nentries, enum audit_nfcfgop op) diff --git a/include/linux/security.h b/include/linux/security.h index 02dc3b5ef57b..b046494ba66e 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -179,6 +179,8 @@ struct lsmblob { #define LSMBLOB_INVALID -1 /* Not a valid LSM slot number */ #define LSMBLOB_NEEDED -2 /* Slot requested on initialization */ #define LSMBLOB_NOT_NEEDED -3 /* Slot not requested */ +#define LSMBLOB_DISPLAY -4 /* Use the "display" slot */ +#define LSMBLOB_FIRST -5 /* Use the default "display" slot */ /** * lsmblob_init - initialize an lsmblob structure. @@ -241,6 +243,17 @@ static inline u32 lsmblob_value(const struct lsmblob *blob) return 0; } +const char *security_lsm_slot_name(int slot); + +static inline bool lsm_multiple_contexts(void) +{ +#ifdef CONFIG_SECURITY + return security_lsm_slot_name(1) != NULL; +#else + return false; +#endif +} + /* These functions are in security/commoncap.c */ extern int cap_capable(const struct cred *cred, struct user_namespace *ns, int cap, unsigned int opts); @@ -553,7 +566,8 @@ int security_setprocattr(const char *lsm, const char *name, void *value, size_t size); int security_netlink_send(struct sock *sk, struct sk_buff *skb); int security_ismaclabel(const char *name); -int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp); +int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp, + int display); int security_secctx_to_secid(const char *secdata, u32 seclen, struct lsmblob *blob); void security_release_secctx(struct lsmcontext *cp); @@ -1371,7 +1385,7 @@ static inline int security_ismaclabel(const char *name) } static inline int security_secid_to_secctx(struct lsmblob *blob, - struct lsmcontext *cp) + struct lsmcontext *cp, int display) { return -EOPNOTSUPP; } diff --git a/include/net/netlabel.h b/include/net/netlabel.h index 73fc25b4042b..216cb1ffc8f0 100644 --- a/include/net/netlabel.h +++ b/include/net/netlabel.h @@ -97,7 +97,7 @@ struct calipso_doi; /* NetLabel audit information */ struct netlbl_audit { - u32 secid; + struct lsmblob lsmdata; kuid_t loginuid; unsigned int sessionid; }; diff --git a/include/net/scm.h b/include/net/scm.h index 4a6ad8caf423..8b5a4737e1b8 100644 --- a/include/net/scm.h +++ b/include/net/scm.h @@ -96,7 +96,8 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc int err; if (test_bit(SOCK_PASSSEC, &sock->flags)) { - err = security_secid_to_secctx(&scm->lsmblob, &context); + err = security_secid_to_secctx(&scm->lsmblob, &context, + LSMBLOB_DISPLAY); if (!err) { put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, diff --git a/include/net/xfrm.h b/include/net/xfrm.h index c7d213c9f9d8..930432c3912e 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -672,11 +672,13 @@ static inline struct audit_buffer *xfrm_audit_start(const char *op) if (audit_enabled == AUDIT_OFF) return NULL; + audit_stamp_context(audit_context()); audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_MAC_IPSEC_EVENT); if (audit_buf == NULL) return NULL; audit_log_format(audit_buf, "op=%s", op); + audit_log_lsm(NULL, false); return audit_buf; } @@ -690,7 +692,7 @@ static inline void xfrm_audit_helper_usrinfo(bool task_valid, AUDIT_SID_UNSET; audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); - audit_log_task_context(audit_buf); + audit_log_task_context(audit_buf, NULL); } void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h index 9b6a973f4cc3..a5403efc2fdf 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -139,6 +139,7 @@ #define AUDIT_MAC_UNLBL_STCDEL 1417 /* NetLabel: del a static label */ #define AUDIT_MAC_CALIPSO_ADD 1418 /* NetLabel: add CALIPSO DOI entry */ #define AUDIT_MAC_CALIPSO_DEL 1419 /* NetLabel: del CALIPSO DOI entry */ +#define AUDIT_MAC_TASK_CONTEXTS 1420 /* Multiple LSM 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 d300e41ca443..777d8da41082 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -389,10 +389,11 @@ static int audit_log_config_change(char *function_name, u32 new, u32 old, return rc; audit_log_format(ab, "op=set %s=%u old=%u ", function_name, new, old); audit_log_session_info(ab); - rc = audit_log_task_context(ab); + rc = audit_log_task_context(ab, NULL); if (rc) allow_changes = 0; /* Something weird, deny request */ audit_log_format(ab, " res=%d", allow_changes); + audit_log_lsm(NULL, false); audit_log_end(ab); return rc; } @@ -1065,13 +1066,31 @@ static void audit_log_common_recv_msg(struct audit_context *context, return; audit_log_format(*ab, "pid=%d uid=%u ", pid, uid); audit_log_session_info(*ab); - audit_log_task_context(*ab); + audit_log_task_context(*ab, NULL); } static inline void audit_log_user_recv_msg(struct audit_buffer **ab, u16 msg_type) { - audit_log_common_recv_msg(NULL, ab, msg_type); + struct audit_context *context; + + if (!lsm_multiple_contexts()) { + audit_log_common_recv_msg(NULL, ab, msg_type); + return; + } + + context = audit_context(); + if (context) { + if (!context->in_syscall) + audit_stamp_context(context); + audit_log_common_recv_msg(context, ab, msg_type); + return; + } + + audit_alloc(current); + context = audit_context(); + + audit_log_common_recv_msg(context, ab, msg_type); } int is_audit_feature_set(int i) @@ -1361,6 +1380,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) audit_log_n_untrustedstring(ab, str, data_len); } audit_log_end(ab); + audit_log_lsm(NULL, false); } break; case AUDIT_ADD_RULE: @@ -1430,7 +1450,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) case AUDIT_SIGNAL_INFO: if (lsmblob_is_set(&audit_sig_lsm)) { err = security_secid_to_secctx(&audit_sig_lsm, - &context); + &context, LSMBLOB_FIRST); if (err) return err; } @@ -1556,7 +1576,7 @@ static void audit_log_multicast(int group, const char *op, int err) tty ? tty_name(tty) : "(none)", audit_get_sessionid(current)); audit_put_tty(tty); - audit_log_task_context(ab); /* subj= */ + audit_log_task_context(ab, NULL); /* subj= */ audit_log_format(ab, " comm="); audit_log_untrustedstring(ab, get_task_comm(comm, current)); audit_log_d_path_exe(ab, current->mm); /* exe= */ @@ -1851,6 +1871,11 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, audit_get_stamp(ab->ctx, &t, &serial); audit_clear_dummy(ab->ctx); + + if (type == AUDIT_MAC_TASK_CONTEXTS && ab->ctx->serial == 0) { + audit_stamp_context(ab->ctx); + audit_get_stamp(ab->ctx, &t, &serial); + } audit_log_format(ab, "audit(%llu.%03lu:%u): ", (unsigned long long)t.tv_sec, t.tv_nsec/1000000, serial); @@ -2108,30 +2133,47 @@ void audit_log_key(struct audit_buffer *ab, char *key) audit_log_format(ab, "(null)"); } -int audit_log_task_context(struct audit_buffer *ab) +int audit_log_task_context(struct audit_buffer *ab, struct lsmblob *blob) { + int i; int error; - struct lsmblob blob; - struct lsmcontext context; + struct lsmblob localblob; + struct lsmcontext lsmdata; - security_task_getsecid(current, &blob); - if (!lsmblob_is_set(&blob)) + /* + * If there is more than one security module that has a + * subject "context" it's necessary to put the subject data + * into a separate record to maintain compatibility. + */ + if (lsm_multiple_contexts()) { + audit_log_format(ab, " subj=?"); return 0; + } - error = security_secid_to_secctx(&blob, &context); - if (error) { - if (error != -EINVAL) - goto error_path; - return 0; + if (blob == NULL) { + security_task_getsecid(current, &localblob); + if (!lsmblob_is_set(&localblob)) { + audit_log_format(ab, " subj=?"); + return 0; + } + blob = &localblob; } - audit_log_format(ab, " subj=%s", context.context); - security_release_secctx(&context); - return 0; + for (i = 0; i < LSMBLOB_ENTRIES; i++) { + if (blob->secid[i] == 0) + continue; + error = security_secid_to_secctx(blob, &lsmdata, i); + if (error && error != -EINVAL) { + audit_panic("error in audit_log_task_context"); + return error; + } + + audit_log_format(ab, " subj=%s", lsmdata.context); + security_release_secctx(&lsmdata); + break; + } -error_path: - audit_panic("error in audit_log_task_context"); - return error; + return 0; } EXPORT_SYMBOL(audit_log_task_context); @@ -2203,7 +2245,7 @@ void audit_log_task_info(struct audit_buffer *ab) audit_log_format(ab, " comm="); audit_log_untrustedstring(ab, get_task_comm(comm, current)); audit_log_d_path_exe(ab, current->mm); - audit_log_task_context(ab); + audit_log_task_context(ab, NULL); } EXPORT_SYMBOL(audit_log_task_info); @@ -2261,6 +2303,7 @@ static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid, if (!audit_enabled) return; + audit_stamp_context(audit_context()); ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_LOGIN); if (!ab) return; @@ -2271,11 +2314,12 @@ static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid, tty = audit_get_tty(); audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid); - audit_log_task_context(ab); + audit_log_task_context(ab, NULL); audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d", oldloginuid, loginuid, tty ? tty_name(tty) : "(none)", oldsessionid, sessionid, !rc); audit_put_tty(tty); + audit_log_lsm(NULL, true); audit_log_end(ab); } diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index 31732023b689..6c03e463668e 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1107,7 +1107,7 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re if (!ab) return; audit_log_session_info(ab); - audit_log_task_context(ab); + audit_log_task_context(ab, NULL); audit_log_format(ab, " op=%s", action); audit_log_key(ab, rule->filterkey); audit_log_format(ab, " list=%d res=%d", rule->listnr, res); diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 1f7bd6b34ec7..55642a039632 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -455,7 +455,7 @@ static int audit_filter_rules(struct task_struct *tsk, { const struct cred *cred; int i, need_sid = 1; - struct lsmblob blob; + struct lsmblob blob = { }; unsigned int sessionid; cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); @@ -944,10 +944,12 @@ int audit_alloc(struct task_struct *tsk) return 0; /* Return if not auditing. */ state = audit_filter_task(tsk, &key); - if (state == AUDIT_DISABLED) { + if (!lsm_multiple_contexts() && state == AUDIT_DISABLED) { clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); return 0; } + if (state == AUDIT_DISABLED) + clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); if (!(context = audit_alloc_context(state))) { kfree(key); @@ -991,7 +993,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t 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)) { + if (security_secid_to_secctx(blob, &lsmctx, LSMBLOB_FIRST)) { audit_log_format(ab, " obj=(none)"); rc = 1; } else { @@ -1236,7 +1238,8 @@ static void show_special(struct audit_context *context, int *call_panic) struct lsmblob blob; lsmblob_init(&blob, osid); - if (security_secid_to_secctx(&blob, &lsmcxt)) { + if (security_secid_to_secctx(&blob, &lsmcxt, + LSMBLOB_FIRST)) { audit_log_format(ab, " osid=%u", osid); *call_panic = 1; } else { @@ -1388,7 +1391,7 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n, struct lsmcontext lsmctx; lsmblob_init(&blob, n->osid); - if (security_secid_to_secctx(&blob, &lsmctx)) { + if (security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_FIRST)) { audit_log_format(ab, " osid=%u", n->osid); if (call_panic) *call_panic = 2; @@ -1462,6 +1465,52 @@ static void audit_log_proctitle(void) audit_log_end(ab); } +void audit_log_lsm(struct lsmblob *blob, bool exiting) +{ + struct audit_context *context = audit_context(); + struct lsmcontext lsmdata; + struct audit_buffer *ab; + struct lsmblob localblob; + bool sep = false; + int error; + int i; + + if (!lsm_multiple_contexts()) + return; + + if (context && context->in_syscall && !exiting) + return; + + ab = audit_log_start(context, GFP_KERNEL, AUDIT_MAC_TASK_CONTEXTS); + if (!ab) + return; /* audit_panic or being filtered */ + + if (blob == NULL) { + security_task_getsecid(current, &localblob); + if (!lsmblob_is_set(&localblob)) + return; + blob = &localblob; + } + + for (i = 0; i < LSMBLOB_ENTRIES; i++) { + if (blob->secid[i] == 0) + continue; + error = security_secid_to_secctx(blob, &lsmdata, i); + if (error && error != -EINVAL) { + audit_panic("error in audit_log_lsm"); + return; + } + + audit_log_format(ab, "%ssubj_%s=%s", sep ? " " : "", + security_lsm_slot_name(i), lsmdata.context); + sep = true; + + security_release_secctx(&lsmdata); + } + + audit_log_end(ab); +} + static void audit_log_exit(void) { int i, call_panic = 0; @@ -1585,6 +1634,7 @@ static void audit_log_exit(void) } audit_log_proctitle(); + audit_log_lsm(NULL, true); /* Send end of event record to help user space know we are finished */ ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); @@ -2183,6 +2233,21 @@ void __audit_inode_child(struct inode *parent, } EXPORT_SYMBOL_GPL(__audit_inode_child); +/** + * audit_stamp_context - set the timestamp+serial in an audit context + * @ctx: audit_context to set + */ +void audit_stamp_context(struct audit_context *ctx) +{ + /* ctx will be NULL unless lsm_multiple_contexts() is true */ + if (!ctx) + return; + + ktime_get_coarse_real_ts64(&ctx->ctime); + ctx->serial = audit_serial(); + ctx->current_state = AUDIT_BUILD_CONTEXT; +} + /** * auditsc_get_stamp - get local copies of audit_context values * @ctx: audit_context for the task @@ -2194,6 +2259,12 @@ EXPORT_SYMBOL_GPL(__audit_inode_child); int auditsc_get_stamp(struct audit_context *ctx, struct timespec64 *t, unsigned int *serial) { + if (ctx->serial && !ctx->in_syscall) { + t->tv_sec = ctx->ctime.tv_sec; + t->tv_nsec = ctx->ctime.tv_nsec; + *serial = ctx->serial; + return 1; + } if (!ctx->in_syscall) return 0; if (!ctx->serial) @@ -2588,7 +2659,7 @@ void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries, name, af, nentries, audit_nfcfgs[op].s); audit_log_format(ab, " pid=%u", task_pid_nr(current)); - audit_log_task_context(ab); /* subj= */ + audit_log_task_context(ab, NULL); /* subj= */ audit_log_format(ab, " comm="); audit_log_untrustedstring(ab, get_task_comm(comm, current)); audit_log_end(ab); @@ -2611,7 +2682,7 @@ static void audit_log_task(struct audit_buffer *ab) from_kuid(&init_user_ns, uid), from_kgid(&init_user_ns, gid), sessionid); - audit_log_task_context(ab); + audit_log_task_context(ab, NULL); audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current)); audit_log_untrustedstring(ab, get_task_comm(comm, current)); audit_log_d_path_exe(ab, current->mm); @@ -2634,11 +2705,13 @@ void audit_core_dumps(long signr) if (signr == SIGQUIT) /* don't care for those */ return; + audit_stamp_context(audit_context()); ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_ABEND); if (unlikely(!ab)) return; audit_log_task(ab); audit_log_format(ab, " sig=%ld res=1", signr); + audit_log_lsm(NULL, true); audit_log_end(ab); } diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 176ac9ce6069..e5c7a1b94ca4 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -138,7 +138,7 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) if (err) return; - err = security_secid_to_secctx(&lb, &context); + err = security_secid_to_secctx(&lb, &context, LSMBLOB_DISPLAY); if (err) return; diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index e38b5182e301..3c90b9a488d5 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -339,7 +339,7 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct) * security_secid_to_secctx() will know which security module * to use to create the secctx. */ lsmblob_init(&blob, ct->secmark); - ret = security_secid_to_secctx(&blob, &context); + ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY); if (ret) return 0; @@ -655,7 +655,7 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct) struct lsmblob blob; struct lsmcontext context; - ret = security_secid_to_secctx(&blob, &context); + ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY); if (ret) return 0; diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c index 0ecd1040f4f1..de85317a366e 100644 --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -177,7 +177,7 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) struct lsmcontext context; lsmblob_init(&blob, ct->secmark); - ret = security_secid_to_secctx(&blob, &context); + ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY); if (ret) return; diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index a4d4602ab9b7..15cabd7be92a 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -316,7 +316,7 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, struct lsmcontext *context) * blob. security_secid_to_secctx() will know which security * module to use to create the secctx. */ lsmblob_init(&blob, skb->secmark); - security_secid_to_secctx(&blob, context); + security_secid_to_secctx(&blob, context, LSMBLOB_DISPLAY); } read_unlock_bh(&skb->sk->sk_callback_lock); diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c index c14a485ff045..99579fa49293 100644 --- a/net/netlabel/netlabel_unlabeled.c +++ b/net/netlabel/netlabel_unlabeled.c @@ -437,7 +437,8 @@ int netlbl_unlhsh_add(struct net *net, unlhsh_add_return: rcu_read_unlock(); if (audit_buf != NULL) { - if (security_secid_to_secctx(lsmblob, &context) == 0) { + if (security_secid_to_secctx(lsmblob, &context, + LSMBLOB_FIRST) == 0) { audit_log_format(audit_buf, " sec_obj=%s", context.context); security_release_secctx(&context); @@ -492,7 +493,8 @@ static int netlbl_unlhsh_remove_addr4(struct net *net, if (dev != NULL) dev_put(dev); if (entry != NULL && - security_secid_to_secctx(&entry->lsmblob, &context) == 0) { + security_secid_to_secctx(&entry->lsmblob, &context, + LSMBLOB_FIRST) == 0) { audit_log_format(audit_buf, " sec_obj=%s", context.context); security_release_secctx(&context); @@ -552,7 +554,8 @@ static int netlbl_unlhsh_remove_addr6(struct net *net, if (dev != NULL) dev_put(dev); if (entry != NULL && - security_secid_to_secctx(&entry->lsmblob, &context) == 0) { + security_secid_to_secctx(&entry->lsmblob, &context, + LSMBLOB_FIRST) == 0) { audit_log_format(audit_buf, " sec_obj=%s", context.context); security_release_secctx(&context); @@ -1122,7 +1125,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd, lsmb = (struct lsmblob *)&addr6->lsmblob; } - ret_val = security_secid_to_secctx(lsmb, &context); + ret_val = security_secid_to_secctx(lsmb, &context, LSMBLOB_FIRST); if (ret_val != 0) goto list_cb_failure; ret_val = nla_put(cb_arg->skb, @@ -1521,14 +1524,11 @@ int __init netlbl_unlabel_defconf(void) int ret_val; struct netlbl_dom_map *entry; struct netlbl_audit audit_info; - struct lsmblob blob; /* Only the kernel is allowed to call this function and the only time * it is called is at bootup before the audit subsystem is reporting * messages so don't worry to much about these values. */ - security_task_getsecid(current, &blob); - /* scaffolding until audit_info.secid is converted */ - audit_info.secid = blob.secid[0]; + security_task_getsecid(current, &audit_info.lsmdata); audit_info.loginuid = GLOBAL_ROOT_UID; audit_info.sessionid = 0; diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c index 951ba0639d20..4e9064754b5f 100644 --- a/net/netlabel/netlabel_user.c +++ b/net/netlabel/netlabel_user.c @@ -84,12 +84,12 @@ struct audit_buffer *netlbl_audit_start_common(int type, struct netlbl_audit *audit_info) { struct audit_buffer *audit_buf; - struct lsmcontext context; - struct lsmblob blob; if (audit_enabled == AUDIT_OFF) return NULL; + audit_stamp_context(audit_context()); + audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type); if (audit_buf == NULL) return NULL; @@ -98,12 +98,8 @@ struct audit_buffer *netlbl_audit_start_common(int type, from_kuid(&init_user_ns, audit_info->loginuid), audit_info->sessionid); - lsmblob_init(&blob, audit_info->secid); - if (audit_info->secid != 0 && - security_secid_to_secctx(&blob, &context) == 0) { - audit_log_format(audit_buf, " subj=%s", context.context); - security_release_secctx(&context); - } + audit_log_task_context(audit_buf, &audit_info->lsmdata); + audit_log_lsm(&audit_info->lsmdata, false); return audit_buf; } diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h index 438b5db6c714..bd4335443b87 100644 --- a/net/netlabel/netlabel_user.h +++ b/net/netlabel/netlabel_user.h @@ -34,11 +34,7 @@ static inline void netlbl_netlink_auditinfo(struct sk_buff *skb, struct netlbl_audit *audit_info) { - struct lsmblob blob; - - security_task_getsecid(current, &blob); - /* scaffolding until secid is converted */ - audit_info->secid = blob.secid[0]; + security_task_getsecid(current, &audit_info->lsmdata); audit_info->loginuid = audit_get_loginuid(current); audit_info->sessionid = audit_get_sessionid(current); } diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c index 5109173839cc..00d8aa358651 100644 --- a/security/integrity/integrity_audit.c +++ b/security/integrity/integrity_audit.c @@ -41,7 +41,7 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode, from_kuid(&init_user_ns, current_cred()->uid), from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); - audit_log_task_context(ab); + audit_log_task_context(ab, NULL); audit_log_format(ab, " op=%s cause=%s comm=", op, cause); audit_log_untrustedstring(ab, get_task_comm(name, current)); if (fname) { diff --git a/security/security.c b/security/security.c index 95b48721fb17..d35e578fa45b 100644 --- a/security/security.c +++ b/security/security.c @@ -480,7 +480,31 @@ static int lsm_append(const char *new, char **result) * Pointers to the LSM id structures for local use. */ static int lsm_slot __lsm_ro_after_init; -static struct lsm_id *lsm_slotlist[LSMBLOB_ENTRIES]; +static struct lsm_id *lsm_slotlist[LSMBLOB_ENTRIES] __lsm_ro_after_init; + +/** + * security_lsm_slot_name - Get the name of the security module in a slot + * @slot: index into the "display" slot list. + * + * Provide the name of the security module associated with + * a display slot. + * + * If @slot is LSMBLOB_INVALID return the value + * for slot 0 if it has been set, otherwise NULL. + * + * Returns a pointer to the name string or NULL. + */ +const char *security_lsm_slot_name(int slot) +{ + if (slot == LSMBLOB_INVALID) + slot = 0; + else if (slot >= LSMBLOB_ENTRIES || slot < 0) + return NULL; + + if (lsm_slotlist[slot] == NULL) + return NULL; + return lsm_slotlist[slot]->lsm; +} /** * security_add_hooks - Add a modules hooks to the hook lists. @@ -2220,13 +2244,32 @@ int security_ismaclabel(const char *name) } EXPORT_SYMBOL(security_ismaclabel); -int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp) +int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp, + int display) { struct security_hook_list *hp; - int display = lsm_task_display(current); memset(cp, 0, sizeof(*cp)); + /* + * display either is the slot number use for formatting + * or an instruction on which relative slot to use. + */ + if (display == LSMBLOB_DISPLAY) + display = lsm_task_display(current); + else if (display == LSMBLOB_FIRST) + display = LSMBLOB_INVALID; + else if (display < 0) { + WARN_ONCE(true, + "LSM: %s unknown display\n", __func__); + display = LSMBLOB_INVALID; + } else if (display >= lsm_slot) { + WARN_ONCE(true, + "LSM: %s invalid display\n", __func__); + display = LSMBLOB_INVALID; + } + + hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) { if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) continue; @@ -2256,7 +2299,7 @@ int security_secctx_to_secid(const char *secdata, u32 seclen, return hp->hook.secctx_to_secid(secdata, seclen, &blob->secid[hp->lsmid->slot]); } - return 0; + return -EOPNOTSUPP; } EXPORT_SYMBOL(security_secctx_to_secid); @@ -2757,23 +2800,17 @@ int security_key_getsecurity(struct key *key, char **_buffer) int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule) { struct security_hook_list *hp; - bool one_is_good = false; - int rc = 0; - int trc; + int display = lsm_task_display(current); hlist_for_each_entry(hp, &security_hook_heads.audit_rule_init, list) { if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) continue; - trc = hp->hook.audit_rule_init(field, op, rulestr, - &lsmrule[hp->lsmid->slot]); - if (trc == 0) - one_is_good = true; - else - rc = trc; + if (display != LSMBLOB_INVALID && display != hp->lsmid->slot) + continue; + return hp->hook.audit_rule_init(field, op, rulestr, + &lsmrule[hp->lsmid->slot]); } - if (one_is_good) - return 0; - return rc; + return 0; } int security_audit_rule_known(struct audit_krule *krule) @@ -2805,6 +2842,8 @@ int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op, continue; if (lsmrule[hp->lsmid->slot] == NULL) continue; + if (lsmrule[hp->lsmid->slot] == NULL) + continue; rc = hp->hook.audit_rule_match(blob->secid[hp->lsmid->slot], field, op, &lsmrule[hp->lsmid->slot]); diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 177e69b43a52..2abdb45b3a61 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -185,7 +185,8 @@ static void smk_netlabel_audit_set(struct netlbl_audit *nap) nap->loginuid = audit_get_loginuid(current); nap->sessionid = audit_get_sessionid(current); - nap->secid = skp->smk_secid; + lsmblob_init(&nap->lsmdata, 0); + nap->lsmdata.secid[smack_lsmid.slot] = skp->smk_secid; } /*