From: Casey Schaufler <casey@schaufler-ca.com> 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 v32 25/28] Audit: Add record for multiple task security contexts Date: Wed, 2 Feb 2022 15:53:20 -0800 [thread overview] Message-ID: <20220202235323.23929-26-casey@schaufler-ca.com> (raw) In-Reply-To: <20220202235323.23929-1-casey@schaufler-ca.com> Create a new audit record AUDIT_MAC_TASK_CONTEXTS. An example of the MAC_TASK_CONTEXTS (1420) record is: type=MAC_TASK_CONTEXTS[1420] msg=audit(1600880931.832:113) subj_apparmor=unconfined subj_smack=_ When an audit event includes a AUDIT_MAC_TASK_CONTEXTS record the "subj=" field in other records in the event will be "subj=?". An AUDIT_MAC_TASK_CONTEXTS record is supplied when the system has multiple security modules that may make access decisions based on a subject security context. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> --- include/linux/security.h | 9 ++++++ include/uapi/linux/audit.h | 1 + kernel/audit.c | 58 ++++++++++++++++++++++++++++++++------ 3 files changed, 60 insertions(+), 8 deletions(-) diff --git a/include/linux/security.h b/include/linux/security.h index 39e113574ba7..280ea8d4778f 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -231,6 +231,15 @@ static inline bool lsmblob_equal(struct lsmblob *bloba, struct lsmblob *blobb) extern int lsm_name_to_slot(char *name); extern const char *lsm_slot_to_name(int slot); +static inline bool lsm_multiple_contexts(void) +{ +#ifdef CONFIG_SECURITY + return lsm_slot_to_name(1) != NULL; +#else + return false; +#endif +} + /** * lsmblob_value - find the first non-zero value in an lsmblob structure. * @blob: Pointer to the data diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h index 8eda133ca4c1..af0aaccfaf57 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -143,6 +143,7 @@ #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 task 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 559fb14e0380..e8744e80ef21 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -197,6 +197,9 @@ static struct audit_ctl_mutex { struct audit_context_entry { struct list_head list; int type; /* Audit record type */ + union { + struct lsmblob lsm_subjs; + }; }; /* The audit_buffer is used when formatting an audit record. The caller @@ -2163,16 +2166,31 @@ int audit_log_task_context(struct audit_buffer *ab) if (!lsmblob_is_set(&blob)) return 0; - error = security_secid_to_secctx(&blob, &context, LSMBLOB_FIRST); + if (!lsm_multiple_contexts()) { + error = security_secid_to_secctx(&blob, &context, + LSMBLOB_FIRST); + if (error) { + if (error != -EINVAL) + goto error_path; + return 0; + } - if (error) { - if (error != -EINVAL) + audit_log_format(ab, " subj=%s", context.context); + security_release_secctx(&context); + } else { + struct audit_context_entry *ace; + + audit_log_format(ab, " subj=?"); + ace = kzalloc(sizeof(*ace), ab->gfp_mask); + if (!ace) { + error = -ENOMEM; goto error_path; - return 0; + } + INIT_LIST_HEAD(&ace->list); + ace->type = AUDIT_MAC_TASK_CONTEXTS; + ace->lsm_subjs = blob; + list_add(&ace->list, &ab->aux_records); } - - audit_log_format(ab, " subj=%s", context.context); - security_release_secctx(&context); return 0; error_path: @@ -2434,9 +2452,12 @@ void audit_log_end(struct audit_buffer *ab) struct audit_context_entry *entry; struct audit_context mcontext; struct audit_context *mctx; + struct lsmcontext lcontext; struct audit_buffer *mab; struct list_head *l; struct list_head *n; + int rc; + int i; if (!ab) return; @@ -2449,6 +2470,7 @@ void audit_log_end(struct audit_buffer *ab) } if (ab->ctx == NULL) { + mcontext.context = AUDIT_CTX_SYSCALL; mcontext.stamp = ab->stamp; mctx = &mcontext; } else @@ -2462,7 +2484,27 @@ void audit_log_end(struct audit_buffer *ab) continue; } switch (entry->type) { - /* Don't know of any quite yet. */ + case AUDIT_MAC_TASK_CONTEXTS: + for (i = 0; i < LSMBLOB_ENTRIES; i++) { + if (entry->lsm_subjs.secid[i] == 0) + continue; + rc = security_secid_to_secctx(&entry->lsm_subjs, + &lcontext, i); + if (rc) { + if (rc != -EINVAL) + audit_panic("error in audit_log_end"); + audit_log_format(mab, "%ssubj_%s=?", + i ? " " : "", + lsm_slot_to_name(i)); + } else { + audit_log_format(mab, "%ssubj_%s=%s", + i ? " " : "", + lsm_slot_to_name(i), + lcontext.context); + security_release_secctx(&lcontext); + } + } + break; default: audit_panic("Unknown type in audit_log_end"); break; -- 2.31.1
WARNING: multiple messages have this Message-ID (diff)
From: Casey Schaufler <casey@schaufler-ca.com> To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: john.johansen@canonical.com, linux-kernel@vger.kernel.org, linux-audit@redhat.com, sds@tycho.nsa.gov Subject: [PATCH v32 25/28] Audit: Add record for multiple task security contexts Date: Wed, 2 Feb 2022 15:53:20 -0800 [thread overview] Message-ID: <20220202235323.23929-26-casey@schaufler-ca.com> (raw) In-Reply-To: <20220202235323.23929-1-casey@schaufler-ca.com> Create a new audit record AUDIT_MAC_TASK_CONTEXTS. An example of the MAC_TASK_CONTEXTS (1420) record is: type=MAC_TASK_CONTEXTS[1420] msg=audit(1600880931.832:113) subj_apparmor=unconfined subj_smack=_ When an audit event includes a AUDIT_MAC_TASK_CONTEXTS record the "subj=" field in other records in the event will be "subj=?". An AUDIT_MAC_TASK_CONTEXTS record is supplied when the system has multiple security modules that may make access decisions based on a subject security context. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> --- include/linux/security.h | 9 ++++++ include/uapi/linux/audit.h | 1 + kernel/audit.c | 58 ++++++++++++++++++++++++++++++++------ 3 files changed, 60 insertions(+), 8 deletions(-) diff --git a/include/linux/security.h b/include/linux/security.h index 39e113574ba7..280ea8d4778f 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -231,6 +231,15 @@ static inline bool lsmblob_equal(struct lsmblob *bloba, struct lsmblob *blobb) extern int lsm_name_to_slot(char *name); extern const char *lsm_slot_to_name(int slot); +static inline bool lsm_multiple_contexts(void) +{ +#ifdef CONFIG_SECURITY + return lsm_slot_to_name(1) != NULL; +#else + return false; +#endif +} + /** * lsmblob_value - find the first non-zero value in an lsmblob structure. * @blob: Pointer to the data diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h index 8eda133ca4c1..af0aaccfaf57 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -143,6 +143,7 @@ #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 task 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 559fb14e0380..e8744e80ef21 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -197,6 +197,9 @@ static struct audit_ctl_mutex { struct audit_context_entry { struct list_head list; int type; /* Audit record type */ + union { + struct lsmblob lsm_subjs; + }; }; /* The audit_buffer is used when formatting an audit record. The caller @@ -2163,16 +2166,31 @@ int audit_log_task_context(struct audit_buffer *ab) if (!lsmblob_is_set(&blob)) return 0; - error = security_secid_to_secctx(&blob, &context, LSMBLOB_FIRST); + if (!lsm_multiple_contexts()) { + error = security_secid_to_secctx(&blob, &context, + LSMBLOB_FIRST); + if (error) { + if (error != -EINVAL) + goto error_path; + return 0; + } - if (error) { - if (error != -EINVAL) + audit_log_format(ab, " subj=%s", context.context); + security_release_secctx(&context); + } else { + struct audit_context_entry *ace; + + audit_log_format(ab, " subj=?"); + ace = kzalloc(sizeof(*ace), ab->gfp_mask); + if (!ace) { + error = -ENOMEM; goto error_path; - return 0; + } + INIT_LIST_HEAD(&ace->list); + ace->type = AUDIT_MAC_TASK_CONTEXTS; + ace->lsm_subjs = blob; + list_add(&ace->list, &ab->aux_records); } - - audit_log_format(ab, " subj=%s", context.context); - security_release_secctx(&context); return 0; error_path: @@ -2434,9 +2452,12 @@ void audit_log_end(struct audit_buffer *ab) struct audit_context_entry *entry; struct audit_context mcontext; struct audit_context *mctx; + struct lsmcontext lcontext; struct audit_buffer *mab; struct list_head *l; struct list_head *n; + int rc; + int i; if (!ab) return; @@ -2449,6 +2470,7 @@ void audit_log_end(struct audit_buffer *ab) } if (ab->ctx == NULL) { + mcontext.context = AUDIT_CTX_SYSCALL; mcontext.stamp = ab->stamp; mctx = &mcontext; } else @@ -2462,7 +2484,27 @@ void audit_log_end(struct audit_buffer *ab) continue; } switch (entry->type) { - /* Don't know of any quite yet. */ + case AUDIT_MAC_TASK_CONTEXTS: + for (i = 0; i < LSMBLOB_ENTRIES; i++) { + if (entry->lsm_subjs.secid[i] == 0) + continue; + rc = security_secid_to_secctx(&entry->lsm_subjs, + &lcontext, i); + if (rc) { + if (rc != -EINVAL) + audit_panic("error in audit_log_end"); + audit_log_format(mab, "%ssubj_%s=?", + i ? " " : "", + lsm_slot_to_name(i)); + } else { + audit_log_format(mab, "%ssubj_%s=%s", + i ? " " : "", + lsm_slot_to_name(i), + lcontext.context); + security_release_secctx(&lcontext); + } + } + break; default: audit_panic("Unknown type in audit_log_end"); break; -- 2.31.1 -- Linux-audit mailing list Linux-audit@redhat.com https://listman.redhat.com/mailman/listinfo/linux-audit
next prev parent reply other threads:[~2022-02-03 0:22 UTC|newest] Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20220202235323.23929-1-casey.ref@schaufler-ca.com> 2022-02-02 23:52 ` [PATCH v32 00/28] LSM: Module stacking for AppArmor Casey Schaufler 2022-02-02 23:52 ` Casey Schaufler 2022-02-02 23:52 ` [PATCH v32 01/28] integrity: disassociate ima_filter_rule from security_audit_rule Casey Schaufler 2022-02-02 23:52 ` Casey Schaufler 2022-02-02 23:52 ` [PATCH v32 02/28] LSM: Infrastructure management of the sock security Casey Schaufler 2022-02-02 23:52 ` Casey Schaufler 2022-02-02 23:52 ` [PATCH v32 03/28] LSM: Add the lsmblob data structure Casey Schaufler 2022-02-02 23:52 ` Casey Schaufler 2022-03-04 10:48 ` Mickaël Salaün 2022-03-04 10:48 ` Mickaël Salaün 2022-03-04 19:14 ` Casey Schaufler 2022-03-04 19:14 ` Casey Schaufler 2022-02-02 23:52 ` [PATCH v32 04/28] LSM: provide lsm name and id slot mappings Casey Schaufler 2022-02-02 23:52 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 05/28] IMA: avoid label collisions with stacked LSMs Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-22 23:20 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 06/28] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 07/28] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 08/28] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 09/28] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 10/28] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 11/28] LSM: Use lsmblob in security_current_getsecid Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 12/28] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 13/28] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-03 5:23 ` kernel test robot 2022-02-03 5:23 ` kernel test robot 2022-02-03 14:07 ` kernel test robot 2022-02-02 23:53 ` [PATCH v32 14/28] LSM: Specify which LSM to display Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 15/28] LSM: Ensure the correct LSM context releaser Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 16/28] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 17/28] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 18/28] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 19/28] NET: Store LSM netlabel data in a lsmblob Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 20/28] binder: Pass LSM identifier for confirmation Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 21/28] LSM: Extend security_secid_to_secctx to include module selection Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 22/28] Audit: Keep multiple LSM data in audit_names Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 23/28] Audit: Create audit_stamp structure Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 24/28] Audit: Add framework for auxiliary records Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-03 6:34 ` kernel test robot 2022-02-03 22:33 ` [RFC PATCH] Audit: __audit_log_end() can be static kernel test robot 2022-02-04 1:30 ` [PATCH v32 24/28] Audit: Add framework for auxiliary records kernel test robot 2022-03-02 22:32 ` Casey Schaufler 2022-03-02 22:32 ` Casey Schaufler 2022-03-03 22:27 ` Paul Moore 2022-03-03 22:27 ` Paul Moore 2022-03-03 22:33 ` Casey Schaufler 2022-03-03 22:33 ` Casey Schaufler 2022-03-03 22:43 ` Paul Moore 2022-03-03 22:43 ` Paul Moore 2022-03-03 22:55 ` Casey Schaufler 2022-03-03 22:55 ` Casey Schaufler 2022-03-03 23:36 ` Paul Moore 2022-03-03 23:36 ` Paul Moore 2022-03-04 2:13 ` Casey Schaufler 2022-03-04 2:13 ` Casey Schaufler 2022-03-04 14:43 ` Paul Moore 2022-03-04 14:43 ` Paul Moore 2022-02-02 23:53 ` Casey Schaufler [this message] 2022-02-02 23:53 ` [PATCH v32 25/28] Audit: Add record for multiple task security contexts Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 26/28] Audit: Add record for multiple object " Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-03 5:23 ` kernel test robot 2022-02-03 5:43 ` kernel test robot 2022-03-03 23:36 ` Paul Moore 2022-03-03 23:36 ` Paul Moore 2022-03-04 1:26 ` Casey Schaufler 2022-03-04 1:26 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 27/28] LSM: Add /proc attr entry for full LSM context Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-02 23:53 ` [PATCH v32 28/28] AppArmor: Remove the exclusive flag Casey Schaufler 2022-02-02 23:53 ` Casey Schaufler 2022-02-05 4:51 [PATCH v32 25/28] Audit: Add record for multiple task security contexts kernel test robot
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