[apple/xnu.git] / bsd / kern / kern_cs.c

/*
 * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc_internal.h>
#include <sys/sysctl.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/codesign.h>

#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/file_internal.h>
#include <sys/kauth.h>
#include <sys/mount.h>
#include <sys/msg.h>
#include <sys/proc.h>
#include <sys/socketvar.h>
#include <sys/vnode.h>
#include <sys/vnode_internal.h>

#include <sys/ubc.h>
#include <sys/ubc_internal.h>

#include <security/mac.h>
#include <security/mac_policy.h>
#include <security/mac_framework.h>

#include <mach/mach_types.h>
#include <mach/vm_map.h>
#include <mach/mach_vm.h>

#include <kern/kern_types.h>
#include <kern/task.h>

#include <vm/vm_map.h>
#include <vm/vm_kern.h>


#include <kern/assert.h>

#include <pexpert/pexpert.h>

#include <mach/shared_region.h>

#include <libkern/section_keywords.h>

unsigned long cs_procs_killed = 0;
unsigned long cs_procs_invalidated = 0;

int cs_force_kill = 0;
int cs_force_hard = 0;
int cs_debug = 0;
// If set, AMFI will error out early on unsigned code, before evaluation the normal policy.
int cs_debug_fail_on_unsigned_code = 0;
// If the previous mode is enabled, we count the resulting failures here.
unsigned int cs_debug_unsigned_exec_failures = 0;
unsigned int cs_debug_unsigned_mmap_failures = 0;

#if SECURE_KERNEL
/*
 *  Here we split cs_enforcement_enable into cs_system_enforcement_enable and cs_process_enforcement_enable
 *
 *  cs_system_enforcement_enable governs whether or not system level code signing enforcement mechanisms
 *  are applied on the system. Today, the only such mechanism is code signing enforcement of the dyld shared
 *  cache.
 *
 *  cs_process_enforcement_enable governs whether code signing enforcement mechanisms are applied to all
 *  processes or only those that opt into such enforcement.
 *
 *  (On iOS and related, both of these are set by default. On macOS, only cs_system_enforcement_enable
 *  is set by default. Processes can then be opted into code signing enforcement on a case by case basis.)
 */
const int cs_system_enforcement_enable = 1;
const int cs_process_enforcement_enable = 1;
const int cs_library_val_enable = 1;
#else /* !SECURE_KERNEL */
int cs_enforcement_panic = 0;
int cs_relax_platform_task_ports = 0;

#if CONFIG_ENFORCE_SIGNED_CODE
#define DEFAULT_CS_SYSTEM_ENFORCEMENT_ENABLE 1
#define DEFAULT_CS_PROCESS_ENFORCEMENT_ENABLE 1
#else
#define DEFAULT_CS_SYSTEM_ENFORCEMENT_ENABLE 1
#define DEFAULT_CS_PROCESS_ENFORCEMENT_ENABLE 0
#endif
SECURITY_READ_ONLY_LATE(int) cs_system_enforcement_enable = DEFAULT_CS_SYSTEM_ENFORCEMENT_ENABLE;
SECURITY_READ_ONLY_LATE(int) cs_process_enforcement_enable = DEFAULT_CS_PROCESS_ENFORCEMENT_ENABLE;

#if CONFIG_ENFORCE_LIBRARY_VALIDATION
#define DEFAULT_CS_LIBRARY_VA_ENABLE 1
#else
#define DEFAULT_CS_LIBRARY_VA_ENABLE 0
#endif
SECURITY_READ_ONLY_LATE(int) cs_library_val_enable = DEFAULT_CS_LIBRARY_VA_ENABLE;

#endif /* !SECURE_KERNEL */
int cs_all_vnodes = 0;

static lck_grp_t *cs_lockgrp;

SYSCTL_INT(_vm, OID_AUTO, cs_force_kill, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_force_kill, 0, "");
SYSCTL_INT(_vm, OID_AUTO, cs_force_hard, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_force_hard, 0, "");
SYSCTL_INT(_vm, OID_AUTO, cs_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_debug, 0, "");
SYSCTL_INT(_vm, OID_AUTO, cs_debug_fail_on_unsigned_code, CTLFLAG_RW | CTLFLAG_LOCKED,
    &cs_debug_fail_on_unsigned_code, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, cs_debug_unsigned_exec_failures, CTLFLAG_RD | CTLFLAG_LOCKED,
    &cs_debug_unsigned_exec_failures, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, cs_debug_unsigned_mmap_failures, CTLFLAG_RD | CTLFLAG_LOCKED,
    &cs_debug_unsigned_mmap_failures, 0, "");

SYSCTL_INT(_vm, OID_AUTO, cs_all_vnodes, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_all_vnodes, 0, "");

#if !SECURE_KERNEL
SYSCTL_INT(_vm, OID_AUTO, cs_system_enforcement, CTLFLAG_RD | CTLFLAG_LOCKED, &cs_system_enforcement_enable, 0, "");
SYSCTL_INT(_vm, OID_AUTO, cs_process_enforcement, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_process_enforcement_enable, 0, "");
SYSCTL_INT(_vm, OID_AUTO, cs_enforcement_panic, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_enforcement_panic, 0, "");

#if !CONFIG_ENFORCE_LIBRARY_VALIDATION
SYSCTL_INT(_vm, OID_AUTO, cs_library_validation, CTLFLAG_RD | CTLFLAG_LOCKED, &cs_library_val_enable, 0, "");
#endif
#endif /* !SECURE_KERNEL */

int panic_on_cs_killed = 0;

void
cs_init(void)
{
#if MACH_ASSERT
#if PLATFORM_WatchOS || __x86_64__
        panic_on_cs_killed = 1;
#endif /* watchos || x86_64 */
#endif /* MACH_ASSERT */
        PE_parse_boot_argn("panic_on_cs_killed", &panic_on_cs_killed,
            sizeof(panic_on_cs_killed));
#if !SECURE_KERNEL
        int disable_cs_enforcement = 0;
        PE_parse_boot_argn("cs_enforcement_disable", &disable_cs_enforcement,
            sizeof(disable_cs_enforcement));
        if (disable_cs_enforcement && PE_i_can_has_debugger(NULL) != 0) {
                cs_system_enforcement_enable = 0;
                cs_process_enforcement_enable = 0;
        } else {
                int panic = 0;
                PE_parse_boot_argn("cs_enforcement_panic", &panic, sizeof(panic));
                cs_enforcement_panic = (panic != 0);
        }

        PE_parse_boot_argn("cs_relax_platform_task_ports",
            &cs_relax_platform_task_ports,
            sizeof(cs_relax_platform_task_ports));

        PE_parse_boot_argn("cs_debug", &cs_debug, sizeof(cs_debug));

#if !CONFIG_ENFORCE_LIBRARY_VALIDATION
        PE_parse_boot_argn("cs_library_val_enable", &cs_library_val_enable,
            sizeof(cs_library_val_enable));
#endif
#endif /* !SECURE_KERNEL */

        lck_grp_attr_t *attr = lck_grp_attr_alloc_init();
        cs_lockgrp = lck_grp_alloc_init("KERNCS", attr);
        lck_grp_attr_free(attr);
}

int
cs_allow_invalid(struct proc *p)
{
#if MACH_ASSERT
        lck_mtx_assert(&p->p_mlock, LCK_MTX_ASSERT_NOTOWNED);
#endif
#if CONFIG_MACF
        /* There needs to be a MAC policy to implement this hook, or else the
         * kill bits will be cleared here every time. If we have
         * CONFIG_ENFORCE_SIGNED_CODE, we can assume there is a policy
         * implementing the hook.
         */
        if (0 != mac_proc_check_run_cs_invalid(p)) {
                if (cs_debug) {
                        printf("CODE SIGNING: cs_allow_invalid() "
                            "not allowed: pid %d\n",
                            p->p_pid);
                }
                return 0;
        }
        if (cs_debug) {
                printf("CODE SIGNING: cs_allow_invalid() "
                    "allowed: pid %d\n",
                    p->p_pid);
        }
        proc_lock(p);
        p->p_csflags &= ~(CS_KILL | CS_HARD);
        if (p->p_csflags & CS_VALID) {
                p->p_csflags |= CS_DEBUGGED;
        }
        proc_unlock(p);

        vm_map_switch_protect(get_task_map(p->task), FALSE);
#endif
        return (p->p_csflags & (CS_KILL | CS_HARD)) == 0;
}

int
cs_invalid_page(addr64_t vaddr, boolean_t *cs_killed)
{
        struct proc     *p;
        int             send_kill = 0, retval = 0, verbose = cs_debug;
        uint32_t        csflags;

        p = current_proc();

        if (verbose) {
                printf("CODE SIGNING: cs_invalid_page(0x%llx): p=%d[%s]\n",
                    vaddr, p->p_pid, p->p_comm);
        }

        proc_lock(p);

        /* XXX for testing */
        if (cs_force_kill) {
                p->p_csflags |= CS_KILL;
        }
        if (cs_force_hard) {
                p->p_csflags |= CS_HARD;
        }

        /* CS_KILL triggers a kill signal, and no you can't have the page. Nothing else. */
        if (p->p_csflags & CS_KILL) {
                p->p_csflags |= CS_KILLED;
                cs_procs_killed++;
                send_kill = 1;
                retval = 1;
        }

        /* CS_HARD means fail the mapping operation so the process stays valid. */
        if (p->p_csflags & CS_HARD) {
                retval = 1;
        } else {
                if (p->p_csflags & CS_VALID) {
                        p->p_csflags &= ~CS_VALID;
                        cs_procs_invalidated++;
                        verbose = 1;
                }
        }
        csflags = p->p_csflags;
        proc_unlock(p);

        if (verbose) {
                printf("CODE SIGNING: cs_invalid_page(0x%llx): "
                    "p=%d[%s] final status 0x%x, %s page%s\n",
                    vaddr, p->p_pid, p->p_comm, p->p_csflags,
                    retval ? "denying" : "allowing (remove VALID)",
                    send_kill ? " sending SIGKILL" : "");
        }

        if (send_kill) {
                /* We will set the exit reason for the thread later */
                threadsignal(current_thread(), SIGKILL, EXC_BAD_ACCESS, FALSE);
                if (cs_killed) {
                        *cs_killed = TRUE;
                }
        } else if (cs_killed) {
                *cs_killed = FALSE;
        }


        return retval;
}

/*
 * Assumes p (if passed in) is locked with proc_lock().
 */

int
cs_process_enforcement(struct proc *p)
{
        if (cs_process_enforcement_enable) {
                return 1;
        }

        if (p == NULL) {
                p = current_proc();
        }

        if (p != NULL && (p->p_csflags & CS_ENFORCEMENT)) {
                return 1;
        }

        return 0;
}

int
cs_process_global_enforcement(void)
{
        return cs_process_enforcement_enable ? 1 : 0;
}

int
cs_system_enforcement(void)
{
        return cs_system_enforcement_enable ? 1 : 0;
}

/*
 * Returns whether a given process is still valid.
 */
int
cs_valid(struct proc *p)
{
        if (p == NULL) {
                p = current_proc();
        }

        if (p != NULL && (p->p_csflags & CS_VALID)) {
                return 1;
        }

        return 0;
}

/*
 * Library validation functions
 */
int
cs_require_lv(struct proc *p)
{
        if (cs_library_val_enable) {
                return 1;
        }

        if (p == NULL) {
                p = current_proc();
        }

        if (p != NULL && (p->p_csflags & CS_REQUIRE_LV)) {
                return 1;
        }

        return 0;
}

int
csproc_forced_lv(struct proc* p)
{
        if (p == NULL) {
                p = current_proc();
        }
        if (p != NULL && (p->p_csflags & CS_FORCED_LV)) {
                return 1;
        }
        return 0;
}

/*
 * <rdar://problem/24634089> added to allow system level library
 *  validation check at mac_cred_label_update_execve time
 */
int
cs_system_require_lv(void)
{
        return cs_library_val_enable ? 1 : 0;
}

/*
 * Function: csblob_get_base_offset
 *
 * Description: This function returns the base offset into the (possibly universal) binary
 *              for a given blob.
 */

off_t
csblob_get_base_offset(struct cs_blob *blob)
{
        return blob->csb_base_offset;
}

/*
 * Function: csblob_get_size
 *
 * Description: This function returns the size of a given blob.
 */

vm_size_t
csblob_get_size(struct cs_blob *blob)
{
        return blob->csb_mem_size;
}

/*
 * Function: csblob_get_addr
 *
 * Description: This function returns the address of a given blob.
 */

vm_address_t
csblob_get_addr(struct cs_blob *blob)
{
        return blob->csb_mem_kaddr;
}

/*
 * Function: csblob_get_platform_binary
 *
 * Description: This function returns true if the binary is
 *              in the trust cache.
 */

int
csblob_get_platform_binary(struct cs_blob *blob)
{
        if (blob && blob->csb_platform_binary) {
                return 1;
        }
        return 0;
}

/*
 * Function: csblob_get_flags
 *
 * Description: This function returns the flags for a given blob
 */

unsigned int
csblob_get_flags(struct cs_blob *blob)
{
        return blob->csb_flags;
}

/*
 * Function: csblob_get_hashtype
 *
 * Description: This function returns the hash type for a given blob
 */

uint8_t
csblob_get_hashtype(struct cs_blob const * const blob)
{
        return blob->csb_hashtype != NULL ? cs_hash_type(blob->csb_hashtype) : 0;
}

/*
 * Function: csproc_get_blob
 *
 * Description: This function returns the cs_blob
 *              for the process p
 */
struct cs_blob *
csproc_get_blob(struct proc *p)
{
        if (NULL == p) {
                return NULL;
        }

        if (NULL == p->p_textvp) {
                return NULL;
        }

        if ((p->p_csflags & CS_SIGNED) == 0) {
                return NULL;
        }

        return ubc_cs_blob_get(p->p_textvp, -1, p->p_textoff);
}

/*
 * Function: csvnode_get_blob
 *
 * Description: This function returns the cs_blob
 *              for the vnode vp
 */
struct cs_blob *
csvnode_get_blob(struct vnode *vp, off_t offset)
{
        return ubc_cs_blob_get(vp, -1, offset);
}

/*
 * Function: csblob_get_teamid
 *
 * Description: This function returns a pointer to the
 *              team id of csblob
 */
const char *
csblob_get_teamid(struct cs_blob *csblob)
{
        return csblob->csb_teamid;
}

/*
 * Function: csblob_get_identity
 *
 * Description: This function returns a pointer to the
 *              identity string
 */
const char *
csblob_get_identity(struct cs_blob *csblob)
{
        const CS_CodeDirectory *cd;

        cd = (const CS_CodeDirectory *)csblob_find_blob(csblob, CSSLOT_CODEDIRECTORY, CSMAGIC_CODEDIRECTORY);
        if (cd == NULL) {
                return NULL;
        }

        if (cd->identOffset == 0) {
                return NULL;
        }

        return ((const char *)cd) + ntohl(cd->identOffset);
}

/*
 * Function: csblob_get_cdhash
 *
 * Description: This function returns a pointer to the
 *              cdhash of csblob (20 byte array)
 */
const uint8_t *
csblob_get_cdhash(struct cs_blob *csblob)
{
        return csblob->csb_cdhash;
}

/*
 * Function: csblob_get_signer_type
 *
 * Description: This function returns the signer type
 *              as an integer
 */
unsigned int
csblob_get_signer_type(struct cs_blob *csblob)
{
        return csblob->csb_signer_type;
}

void *
csblob_entitlements_dictionary_copy(struct cs_blob *csblob)
{
        if (!csblob->csb_entitlements) {
                return NULL;
        }
        osobject_retain(csblob->csb_entitlements);
        return csblob->csb_entitlements;
}

void
csblob_entitlements_dictionary_set(struct cs_blob *csblob, void * entitlements)
{
        assert(csblob->csb_entitlements == NULL);
        if (entitlements) {
                osobject_retain(entitlements);
        }
        csblob->csb_entitlements = entitlements;
}

/*
 * Function: csproc_get_teamid
 *
 * Description: This function returns a pointer to the
 *              team id of the process p
 */
const char *
csproc_get_teamid(struct proc *p)
{
        struct cs_blob *csblob;

        csblob = csproc_get_blob(p);
        if (csblob == NULL) {
                return NULL;
        }

        return csblob_get_teamid(csblob);
}

/*
 * Function: csproc_get_signer_type
 *
 * Description: This function returns the signer type
 *              of the process p
 */
unsigned int
csproc_get_signer_type(struct proc *p)
{
        struct cs_blob *csblob;

        csblob = csproc_get_blob(p);
        if (csblob == NULL) {
                return CS_SIGNER_TYPE_UNKNOWN;
        }

        return csblob_get_signer_type(csblob);
}

/*
 * Function: csvnode_get_teamid
 *
 * Description: This function returns a pointer to the
 *              team id of the binary at the given offset in vnode vp
 */
const char *
csvnode_get_teamid(struct vnode *vp, off_t offset)
{
        struct cs_blob *csblob;

        if (vp == NULL) {
                return NULL;
        }

        csblob = ubc_cs_blob_get(vp, -1, offset);
        if (csblob == NULL) {
                return NULL;
        }

        return csblob_get_teamid(csblob);
}

/*
 * Function: csproc_get_platform_binary
 *
 * Description: This function returns the value
 *              of the platform_binary field for proc p
 */
int
csproc_get_platform_binary(struct proc *p)
{
        struct cs_blob *csblob;

        csblob = csproc_get_blob(p);

        /* If there is no csblob this returns 0 because
         *  it is true that it is not a platform binary */
        return (csblob == NULL) ? 0 : csblob->csb_platform_binary;
}

int
csproc_get_platform_path(struct proc *p)
{
        struct cs_blob *csblob;

        csblob = csproc_get_blob(p);

        return (csblob == NULL) ? 0 : csblob->csb_platform_path;
}

#if DEVELOPMENT || DEBUG
void
csproc_clear_platform_binary(struct proc *p)
{
        struct cs_blob *csblob = csproc_get_blob(p);

        if (csblob == NULL) {
                return;
        }

        if (cs_debug) {
                printf("clearing platform binary on proc/task: pid = %d\n", p->p_pid);
        }

        csblob->csb_platform_binary = 0;
        csblob->csb_platform_path = 0;
        task_set_platform_binary(proc_task(p), FALSE);
}
#endif

void
csproc_disable_enforcement(struct proc* __unused p)
{
#if !CONFIG_ENFORCE_SIGNED_CODE
        if (p != NULL) {
                proc_lock(p);
                p->p_csflags &= (~CS_ENFORCEMENT);
                proc_unlock(p);
        }
#endif
}

/* Function: csproc_mark_invalid_allowed
 *
 * Description: Mark the process as being allowed to go invalid. Called as part of
 *              task_for_pid and ptrace policy. Note CS_INVALID_ALLOWED only matters for
 *              processes that have been opted into CS_ENFORCEMENT.
 */
void
csproc_mark_invalid_allowed(struct proc* __unused p)
{
#if !CONFIG_ENFORCE_SIGNED_CODE
        if (p != NULL) {
                proc_lock(p);
                p->p_csflags |= CS_INVALID_ALLOWED;
                proc_unlock(p);
        }
#endif
}

/*
 * Function: csproc_check_invalid_allowed
 *
 * Description: Returns 1 if the process has been marked as allowed to go invalid
 *              because it gave its task port to an allowed process.
 */
int
csproc_check_invalid_allowed(struct proc* __unused p)
{
#if !CONFIG_ENFORCE_SIGNED_CODE
        if (p == NULL) {
                p = current_proc();
        }

        if (p != NULL && (p->p_csflags & CS_INVALID_ALLOWED)) {
                return 1;
        }
#endif
        return 0;
}

/*
 * Function: csproc_get_prod_signed
 *
 * Description: Returns 1 if process is not signed with a developer identity.
 *              Note the inverted meaning from the cs_flag to make the error case safer.
 *              Will go away with rdar://problem/28322552.
 */
int
csproc_get_prod_signed(struct proc *p)
{
        return (p->p_csflags & CS_DEV_CODE) == 0;
}


/*
 * Function: csfg_get_platform_binary
 *
 * Description: This function returns the
 *              platform binary field for the
 *              fileglob fg
 */
int
csfg_get_platform_binary(struct fileglob *fg)
{
        int platform_binary = 0;
        struct ubc_info *uip;
        vnode_t vp;

        if (FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
                return 0;
        }

        vp = (struct vnode *)fg->fg_data;
        if (vp == NULL) {
                return 0;
        }

        vnode_lock(vp);
        if (!UBCINFOEXISTS(vp)) {
                goto out;
        }

        uip = vp->v_ubcinfo;
        if (uip == NULL) {
                goto out;
        }

        if (uip->cs_blobs == NULL) {
                goto out;
        }

        /* It is OK to extract the teamid from the first blob
         *  because all blobs of a vnode must have the same teamid */
        platform_binary = uip->cs_blobs->csb_platform_binary;
out:
        vnode_unlock(vp);

        return platform_binary;
}

uint8_t *
csfg_get_cdhash(struct fileglob *fg, uint64_t offset, size_t *cdhash_size)
{
        vnode_t vp;

        if (FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
                return NULL;
        }

        vp = (struct vnode *)fg->fg_data;
        if (vp == NULL) {
                return NULL;
        }

        struct cs_blob *csblob = NULL;
        if ((csblob = ubc_cs_blob_get(vp, -1, offset)) == NULL) {
                return NULL;
        }

        if (cdhash_size) {
                *cdhash_size = CS_CDHASH_LEN;
        }

        return csblob->csb_cdhash;
}

/*
 * Function: csfg_get_signer_type
 *
 * Description: This returns the signer type
 *              for the fileglob fg
 */
unsigned int
csfg_get_signer_type(struct fileglob *fg)
{
        struct ubc_info *uip;
        unsigned int signer_type = CS_SIGNER_TYPE_UNKNOWN;
        vnode_t vp;

        if (FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
                return CS_SIGNER_TYPE_UNKNOWN;
        }

        vp = (struct vnode *)fg->fg_data;
        if (vp == NULL) {
                return CS_SIGNER_TYPE_UNKNOWN;
        }

        vnode_lock(vp);
        if (!UBCINFOEXISTS(vp)) {
                goto out;
        }

        uip = vp->v_ubcinfo;
        if (uip == NULL) {
                goto out;
        }

        if (uip->cs_blobs == NULL) {
                goto out;
        }

        /* It is OK to extract the signer type from the first blob,
         *  because all blobs of a vnode must have the same signer type. */
        signer_type = uip->cs_blobs->csb_signer_type;
out:
        vnode_unlock(vp);

        return signer_type;
}

/*
 * Function: csfg_get_teamid
 *
 * Description: This returns a pointer to
 *              the teamid for the fileglob fg
 */
const char *
csfg_get_teamid(struct fileglob *fg)
{
        struct ubc_info *uip;
        const char *str = NULL;
        vnode_t vp;

        if (FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
                return NULL;
        }

        vp = (struct vnode *)fg->fg_data;
        if (vp == NULL) {
                return NULL;
        }

        vnode_lock(vp);
        if (!UBCINFOEXISTS(vp)) {
                goto out;
        }

        uip = vp->v_ubcinfo;
        if (uip == NULL) {
                goto out;
        }

        if (uip->cs_blobs == NULL) {
                goto out;
        }

        /* It is OK to extract the teamid from the first blob
         *  because all blobs of a vnode must have the same teamid */
        str = uip->cs_blobs->csb_teamid;
out:
        vnode_unlock(vp);

        return str;
}

/*
 * Function: csfg_get_prod_signed
 *
 * Description: Returns 1 if code is not signed with a developer identity.
 *              Note the inverted meaning from the cs_flag to make the error case safer.
 *              Will go away with rdar://problem/28322552.
 */
int
csfg_get_prod_signed(struct fileglob *fg)
{
        struct ubc_info *uip;
        vnode_t vp;
        int prod_signed = 0;

        if (FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
                return 0;
        }

        vp = (struct vnode *)fg->fg_data;
        if (vp == NULL) {
                return 0;
        }

        vnode_lock(vp);
        if (!UBCINFOEXISTS(vp)) {
                goto out;
        }

        uip = vp->v_ubcinfo;
        if (uip == NULL) {
                goto out;
        }

        if (uip->cs_blobs == NULL) {
                goto out;
        }

        /* It is OK to extract the flag from the first blob
         *  because all blobs of a vnode must have the same cs_flags */
        prod_signed = (uip->cs_blobs->csb_flags & CS_DEV_CODE) == 0;
out:
        vnode_unlock(vp);

        return prod_signed;
}

/*
 * Function: csfg_get_identity
 *
 * Description: This function returns the codesign identity
 *              for the fileglob
 */
const char *
csfg_get_identity(struct fileglob *fg, off_t offset)
{
        vnode_t vp;
        struct cs_blob *csblob = NULL;

        if (FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
                return NULL;
        }

        vp = (struct vnode *)fg->fg_data;
        if (vp == NULL) {
                return NULL;
        }

        csblob = ubc_cs_blob_get(vp, -1, offset);
        if (csblob == NULL) {
                return NULL;
        }

        return csblob_get_identity(csblob);
}

/*
 * Function: csfg_get_platform_identifier
 *
 * Description: This function returns the codesign platform
 *              identifier for the fileglob.  Assumes the fileproc
 *              is being held busy to keep the fileglob consistent.
 */
uint8_t
csfg_get_platform_identifier(struct fileglob *fg, off_t offset)
{
        vnode_t vp;

        if (FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
                return 0;
        }

        vp = (struct vnode *)fg->fg_data;
        if (vp == NULL) {
                return 0;
        }

        return csvnode_get_platform_identifier(vp, offset);
}

/*
 * Function: csvnode_get_platform_identifier
 *
 * Description: This function returns the codesign platform
 *              identifier for the vnode.  Assumes a vnode reference
 *              is held.
 */
uint8_t
csvnode_get_platform_identifier(struct vnode *vp, off_t offset)
{
        struct cs_blob *csblob;
        const CS_CodeDirectory *code_dir;

        csblob = ubc_cs_blob_get(vp, -1, offset);
        if (csblob == NULL) {
                return 0;
        }

        code_dir = csblob->csb_cd;
        if (code_dir == NULL || ntohl(code_dir->length) < 8) {
                return 0;
        }

        return code_dir->platform;
}

/*
 * Function: csproc_get_platform_identifier
 *
 * Description: This function returns the codesign platform
 *              identifier for the proc.  Assumes proc will remain
 *              valid through call.
 */
uint8_t
csproc_get_platform_identifier(struct proc *p)
{
        if (NULL == p->p_textvp) {
                return 0;
        }

        return csvnode_get_platform_identifier(p->p_textvp, p->p_textoff);
}

uint32_t
cs_entitlement_flags(struct proc *p)
{
        return p->p_csflags & CS_ENTITLEMENT_FLAGS;
}

int
cs_restricted(struct proc *p)
{
        return (p->p_csflags & CS_RESTRICT) ? 1 : 0;
}

int
csproc_hardened_runtime(struct proc* p)
{
        return (p->p_csflags & CS_RUNTIME) ? 1 : 0;
}

/*
 * Function: csfg_get_path
 *
 * Description: This populates the buffer passed in
 *              with the path of the vnode
 *              When calling this, the fileglob
 *              cannot go away. The caller must have a
 *              a reference on the fileglob or fileproc
 */
int
csfg_get_path(struct fileglob *fg, char *path, int *len)
{
        vnode_t vp = NULL;

        if (FILEGLOB_DTYPE(fg) != DTYPE_VNODE) {
                return -1;
        }

        vp = (struct vnode *)fg->fg_data;

        /* vn_getpath returns 0 for success,
         *  or an error code */
        return vn_getpath(vp, path, len);
}

/* Retrieve the entitlements blob for a process.
 * Returns:
 *   EINVAL     no text vnode associated with the process
 *   EBADEXEC   invalid code signing data
 *   0          no error occurred
 *
 * On success, out_start and out_length will point to the
 * entitlements blob if found; or will be set to NULL/zero
 * if there were no entitlements.
 */

int
cs_entitlements_blob_get(proc_t p, void **out_start, size_t *out_length)
{
        struct cs_blob *csblob;

        *out_start = NULL;
        *out_length = 0;

        if ((p->p_csflags & CS_SIGNED) == 0) {
                return 0;
        }

        if (NULL == p->p_textvp) {
                return EINVAL;
        }

        if ((csblob = ubc_cs_blob_get(p->p_textvp, -1, p->p_textoff)) == NULL) {
                return 0;
        }

        return csblob_get_entitlements(csblob, out_start, out_length);
}

/* Retrieve the codesign identity for a process.
 * Returns:
 *   NULL       an error occured
 *   string     the cs_identity
 */

const char *
cs_identity_get(proc_t p)
{
        struct cs_blob *csblob;

        if ((p->p_csflags & CS_SIGNED) == 0) {
                return NULL;
        }

        if (NULL == p->p_textvp) {
                return NULL;
        }

        if ((csblob = ubc_cs_blob_get(p->p_textvp, -1, p->p_textoff)) == NULL) {
                return NULL;
        }

        return csblob_get_identity(csblob);
}

/*
 * DO NOT USE THIS FUNCTION!
 * Use the properly guarded csproc_get_blob instead.
 *
 * This is currently here to allow detached signatures to work
 * properly. The only user of this function is also checking
 * for CS_VALID.
 */

int
cs_blob_get(proc_t p, void **out_start, size_t *out_length)
{
        struct cs_blob *csblob;

        *out_start = NULL;
        *out_length = 0;

        if (NULL == p->p_textvp) {
                return EINVAL;
        }

        if ((csblob = ubc_cs_blob_get(p->p_textvp, -1, p->p_textoff)) == NULL) {
                return 0;
        }

        *out_start = (void *)csblob->csb_mem_kaddr;
        *out_length = csblob->csb_mem_size;

        return 0;
}

/*
 * return cshash of a process, cdhash is of size CS_CDHASH_LEN
 */

uint8_t *
cs_get_cdhash(struct proc *p)
{
        struct cs_blob *csblob;

        if ((p->p_csflags & CS_SIGNED) == 0) {
                return NULL;
        }

        if (NULL == p->p_textvp) {
                return NULL;
        }

        if ((csblob = ubc_cs_blob_get(p->p_textvp, -1, p->p_textoff)) == NULL) {
                return NULL;
        }

        return csblob->csb_cdhash;
}