/*
- * Copyright (c) 1999-2008 Apple Inc. All rights reserved.
+ * Copyright (c) 1999-2014 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <sys/buf.h>
#include <sys/user.h>
#include <sys/codesign.h>
+#include <sys/codedir_internal.h>
+#include <sys/fsevents.h>
+#include <sys/fcntl.h>
#include <mach/mach_types.h>
#include <mach/memory_object_types.h>
#include <vm/vm_protos.h> /* last */
#include <libkern/crypto/sha1.h>
+#include <libkern/crypto/sha2.h>
#include <libkern/libkern.h>
-#include <sys/kasl.h>
-#include <sys/syslog.h>
-
#include <security/mac_framework.h>
+#include <stdbool.h>
/* XXX These should be in a BSD accessible Mach header, but aren't. */
extern kern_return_t memory_object_pages_resident(memory_object_control_t,
static int ubc_msync_internal(vnode_t, off_t, off_t, off_t *, int, int *);
static void ubc_cs_free(struct ubc_info *uip);
-struct zone *ubc_info_zone;
+static boolean_t ubc_cs_supports_multilevel_hash(struct cs_blob *blob);
+static void ubc_cs_convert_to_multilevel_hash(struct cs_blob *blob);
+struct zone *ubc_info_zone;
+static uint32_t cs_blob_generation_count = 1;
/*
* CODESIGNING
extern int cs_debug;
+#define PAGE_SHIFT_4K (12)
+
static boolean_t
cs_valid_range(
const void *start,
return TRUE;
}
-static void
-hex_str(
- const unsigned char *hash,
- size_t len,
- char *buf)
-{
- unsigned int n;
- for (n = 0; n < len; n++)
- snprintf(buf + 2*n, 3, "%02.2x", hash[n]);
+typedef void (*cs_md_init)(void *ctx);
+typedef void (*cs_md_update)(void *ctx, const void *data, size_t size);
+typedef void (*cs_md_final)(void *hash, void *ctx);
+
+struct cs_hash {
+ uint8_t cs_type; /* type code as per code signing */
+ size_t cs_size; /* size of effective hash (may be truncated) */
+ size_t cs_digest_size; /* size of native hash */
+ cs_md_init cs_init;
+ cs_md_update cs_update;
+ cs_md_final cs_final;
+};
+
+static const struct cs_hash cs_hash_sha1 = {
+ .cs_type = CS_HASHTYPE_SHA1,
+ .cs_size = CS_SHA1_LEN,
+ .cs_digest_size = SHA_DIGEST_LENGTH,
+ .cs_init = (cs_md_init)SHA1Init,
+ .cs_update = (cs_md_update)SHA1Update,
+ .cs_final = (cs_md_final)SHA1Final,
+};
+#if CRYPTO_SHA2
+static const struct cs_hash cs_hash_sha256 = {
+ .cs_type = CS_HASHTYPE_SHA256,
+ .cs_size = SHA256_DIGEST_LENGTH,
+ .cs_digest_size = SHA256_DIGEST_LENGTH,
+ .cs_init = (cs_md_init)SHA256_Init,
+ .cs_update = (cs_md_update)SHA256_Update,
+ .cs_final = (cs_md_final)SHA256_Final,
+};
+static const struct cs_hash cs_hash_sha256_truncate = {
+ .cs_type = CS_HASHTYPE_SHA256_TRUNCATED,
+ .cs_size = CS_SHA256_TRUNCATED_LEN,
+ .cs_digest_size = SHA256_DIGEST_LENGTH,
+ .cs_init = (cs_md_init)SHA256_Init,
+ .cs_update = (cs_md_update)SHA256_Update,
+ .cs_final = (cs_md_final)SHA256_Final,
+};
+static const struct cs_hash cs_hash_sha384 = {
+ .cs_type = CS_HASHTYPE_SHA384,
+ .cs_size = SHA384_DIGEST_LENGTH,
+ .cs_digest_size = SHA384_DIGEST_LENGTH,
+ .cs_init = (cs_md_init)SHA384_Init,
+ .cs_update = (cs_md_update)SHA384_Update,
+ .cs_final = (cs_md_final)SHA384_Final,
+};
+#endif
+
+static struct cs_hash const *
+cs_find_md(uint8_t type)
+{
+ if (type == CS_HASHTYPE_SHA1) {
+ return &cs_hash_sha1;
+#if CRYPTO_SHA2
+ } else if (type == CS_HASHTYPE_SHA256) {
+ return &cs_hash_sha256;
+ } else if (type == CS_HASHTYPE_SHA256_TRUNCATED) {
+ return &cs_hash_sha256_truncate;
+ } else if (type == CS_HASHTYPE_SHA384) {
+ return &cs_hash_sha384;
+#endif
+ }
+ return NULL;
}
+union cs_hash_union {
+ SHA1_CTX sha1ctxt;
+ SHA256_CTX sha256ctx;
+ SHA384_CTX sha384ctx;
+};
+
/*
- * Locate the CodeDirectory from an embedded signature blob
+ * Choose among different hash algorithms.
+ * Higher is better, 0 => don't use at all.
*/
-static const
-CS_CodeDirectory *findCodeDirectory(
- const CS_SuperBlob *embedded,
- char *lower_bound,
- char *upper_bound)
-{
- const CS_CodeDirectory *cd = NULL;
+static const uint32_t hashPriorities[] = {
+ CS_HASHTYPE_SHA1,
+ CS_HASHTYPE_SHA256_TRUNCATED,
+ CS_HASHTYPE_SHA256,
+ CS_HASHTYPE_SHA384,
+};
- if (embedded &&
- cs_valid_range(embedded, embedded + 1, lower_bound, upper_bound) &&
- ntohl(embedded->magic) == CSMAGIC_EMBEDDED_SIGNATURE) {
- const CS_BlobIndex *limit;
- const CS_BlobIndex *p;
-
- limit = &embedded->index[ntohl(embedded->count)];
- if (!cs_valid_range(&embedded->index[0], limit,
- lower_bound, upper_bound)) {
- return NULL;
- }
- for (p = embedded->index; p < limit; ++p) {
- if (ntohl(p->type) == CSSLOT_CODEDIRECTORY) {
- const unsigned char *base;
-
- base = (const unsigned char *)embedded;
- cd = (const CS_CodeDirectory *)(base + ntohl(p->offset));
- break;
- }
- }
- } else {
- /*
- * Detached signatures come as a bare CS_CodeDirectory,
- * without a blob.
- */
- cd = (const CS_CodeDirectory *) embedded;
- }
-
- if (cd &&
- cs_valid_range(cd, cd + 1, lower_bound, upper_bound) &&
- cs_valid_range(cd, (const char *) cd + ntohl(cd->length),
- lower_bound, upper_bound) &&
- cs_valid_range(cd, (const char *) cd + ntohl(cd->hashOffset),
- lower_bound, upper_bound) &&
- cs_valid_range(cd, (const char *) cd +
- ntohl(cd->hashOffset) +
- (ntohl(cd->nCodeSlots) * SHA1_RESULTLEN),
- lower_bound, upper_bound) &&
-
- ntohl(cd->magic) == CSMAGIC_CODEDIRECTORY) {
- return cd;
- }
+static unsigned int
+hash_rank(const CS_CodeDirectory *cd)
+{
+ uint32_t type = cd->hashType;
+ unsigned int n;
- // not found or not a valid code directory
- return NULL;
+ for (n = 0; n < sizeof(hashPriorities) / sizeof(hashPriorities[0]); ++n)
+ if (hashPriorities[n] == type)
+ return n + 1;
+ return 0; /* not supported */
}
static const unsigned char *
hashes(
const CS_CodeDirectory *cd,
- unsigned page,
- char *lower_bound,
- char *upper_bound)
+ uint32_t page,
+ size_t hash_len,
+ const char *lower_bound,
+ const char *upper_bound)
{
const unsigned char *base, *top, *hash;
uint32_t nCodeSlots = ntohl(cd->nCodeSlots);
/* base = address of first hash covered by scatter */
base = (const unsigned char *)cd + ntohl(cd->hashOffset) +
- hashindex * SHA1_RESULTLEN;
+ hashindex * hash_len;
/* top = address of first hash after this scatter */
- top = base + scount * SHA1_RESULTLEN;
+ top = base + scount * hash_len;
if (!cs_valid_range(base, top, lower_bound,
upper_bound) ||
hashindex > nCodeSlots) {
scatter++;
} while(1);
- hash = base + (page - sbase) * SHA1_RESULTLEN;
+ hash = base + (page - sbase) * hash_len;
} else {
base = (const unsigned char *)cd + ntohl(cd->hashOffset);
- top = base + nCodeSlots * SHA1_RESULTLEN;
+ top = base + nCodeSlots * hash_len;
if (!cs_valid_range(base, top, lower_bound, upper_bound) ||
page > nCodeSlots) {
return NULL;
}
assert(page < nCodeSlots);
- hash = base + page * SHA1_RESULTLEN;
+ hash = base + page * hash_len;
}
- if (!cs_valid_range(hash, hash + SHA1_RESULTLEN,
+ if (!cs_valid_range(hash, hash + hash_len,
lower_bound, upper_bound)) {
hash = NULL;
}
static int
cs_validate_codedirectory(const CS_CodeDirectory *cd, size_t length)
{
+ struct cs_hash const *hashtype;
if (length < sizeof(*cd))
return EBADEXEC;
if (ntohl(cd->magic) != CSMAGIC_CODEDIRECTORY)
return EBADEXEC;
- if (cd->hashSize != SHA1_RESULTLEN)
+ if (cd->pageSize < PAGE_SHIFT_4K || cd->pageSize > PAGE_SHIFT)
return EBADEXEC;
- if (cd->pageSize != PAGE_SHIFT)
+ hashtype = cs_find_md(cd->hashType);
+ if (hashtype == NULL)
return EBADEXEC;
- if (cd->hashType != CS_HASHTYPE_SHA1)
+
+ if (cd->hashSize != hashtype->cs_size)
return EBADEXEC;
if (length < ntohl(cd->hashOffset))
return EBADEXEC;
/* check that nSpecialSlots fits in the buffer in front of hashOffset */
- if (ntohl(cd->hashOffset) / SHA1_RESULTLEN < ntohl(cd->nSpecialSlots))
+ if (ntohl(cd->hashOffset) / hashtype->cs_size < ntohl(cd->nSpecialSlots))
return EBADEXEC;
/* check that codeslots fits in the buffer */
- if ((length - ntohl(cd->hashOffset)) / SHA1_RESULTLEN < ntohl(cd->nCodeSlots))
+ if ((length - ntohl(cd->hashOffset)) / hashtype->cs_size < ntohl(cd->nCodeSlots))
return EBADEXEC;
if (ntohl(cd->version) >= CS_SUPPORTSSCATTER && cd->scatterOffset) {
if (length < ntohl(cd->scatterOffset))
return EBADEXEC;
- SC_Scatter *scatter = (SC_Scatter *)
- (((uint8_t *)cd) + ntohl(cd->scatterOffset));
+ const SC_Scatter *scatter = (const SC_Scatter *)
+ (((const uint8_t *)cd) + ntohl(cd->scatterOffset));
uint32_t nPages = 0;
/*
/* identifier is NUL terminated string */
if (cd->identOffset) {
- uint8_t *ptr = (uint8_t *)cd + ntohl(cd->identOffset);
+ const uint8_t *ptr = (const uint8_t *)cd + ntohl(cd->identOffset);
if (memchr(ptr, 0, length - ntohl(cd->identOffset)) == NULL)
return EBADEXEC;
}
+ /* team identifier is NULL terminated string */
+ if (ntohl(cd->version) >= CS_SUPPORTSTEAMID && ntohl(cd->teamOffset)) {
+ if (length < ntohl(cd->teamOffset))
+ return EBADEXEC;
+
+ const uint8_t *ptr = (const uint8_t *)cd + ntohl(cd->teamOffset);
+ if (memchr(ptr, 0, length - ntohl(cd->teamOffset)) == NULL)
+ return EBADEXEC;
+ }
+
return 0;
}
*/
static int
-cs_validate_csblob(const uint8_t *addr, size_t length,
- const CS_CodeDirectory **rcd)
+cs_validate_csblob(
+ const uint8_t *addr,
+ size_t *blob_size_p,
+ const CS_CodeDirectory **rcd,
+ const CS_GenericBlob **rentitlements)
{
- const CS_GenericBlob *blob = (const CS_GenericBlob *)(void *)addr;
+ const CS_GenericBlob *blob;
int error;
+ size_t length, blob_size;
*rcd = NULL;
+ *rentitlements = NULL;
+ blob = (const CS_GenericBlob *)(const void *)addr;
+ blob_size = *blob_size_p;
+
+ length = blob_size;
error = cs_validate_blob(blob, length);
if (error)
return error;
-
length = ntohl(blob->length);
if (ntohl(blob->magic) == CSMAGIC_EMBEDDED_SIGNATURE) {
- const CS_SuperBlob *sb = (const CS_SuperBlob *)blob;
- uint32_t n, count = ntohl(sb->count);
+ const CS_SuperBlob *sb;
+ uint32_t n, count;
+ const CS_CodeDirectory *best_cd = NULL;
+ unsigned int best_rank = 0;
if (length < sizeof(CS_SuperBlob))
return EBADEXEC;
+ sb = (const CS_SuperBlob *)blob;
+ count = ntohl(sb->count);
+
/* check that the array of BlobIndex fits in the rest of the data */
if ((length - sizeof(CS_SuperBlob)) / sizeof(CS_BlobIndex) < count)
return EBADEXEC;
/* now check each BlobIndex */
for (n = 0; n < count; n++) {
const CS_BlobIndex *blobIndex = &sb->index[n];
- if (length < ntohl(blobIndex->offset))
+ uint32_t type = ntohl(blobIndex->type);
+ uint32_t offset = ntohl(blobIndex->offset);
+ if (length < offset)
return EBADEXEC;
const CS_GenericBlob *subBlob =
- (const CS_GenericBlob *)(void *)(addr + ntohl(blobIndex->offset));
+ (const CS_GenericBlob *)(const void *)(addr + offset);
- size_t subLength = length - ntohl(blobIndex->offset);
+ size_t subLength = length - offset;
if ((error = cs_validate_blob(subBlob, subLength)) != 0)
return error;
subLength = ntohl(subBlob->length);
/* extra validation for CDs, that is also returned */
- if (ntohl(blobIndex->type) == CSSLOT_CODEDIRECTORY) {
- const CS_CodeDirectory *cd = (const CS_CodeDirectory *)subBlob;
- if ((error = cs_validate_codedirectory(cd, subLength)) != 0)
+ if (type == CSSLOT_CODEDIRECTORY || (type >= CSSLOT_ALTERNATE_CODEDIRECTORIES && type < CSSLOT_ALTERNATE_CODEDIRECTORY_LIMIT)) {
+ const CS_CodeDirectory *candidate = (const CS_CodeDirectory *)subBlob;
+ if ((error = cs_validate_codedirectory(candidate, subLength)) != 0)
return error;
- *rcd = cd;
+ unsigned int rank = hash_rank(candidate);
+ if (cs_debug > 3)
+ printf("CodeDirectory type %d rank %d at slot 0x%x index %d\n", candidate->hashType, (int)rank, (int)type, (int)n);
+ if (best_cd == NULL || rank > best_rank) {
+ best_cd = candidate;
+ best_rank = rank;
+
+ if (cs_debug > 2)
+ printf("using CodeDirectory type %d (rank %d)\n", (int)best_cd->hashType, best_rank);
+ *rcd = best_cd;
+ } else if (best_cd != NULL && rank == best_rank) {
+ /* repeat of a hash type (1:1 mapped to ranks), illegal and suspicious */
+ printf("multiple hash=%d CodeDirectories in signature; rejecting\n", best_cd->hashType);
+ return EBADEXEC;
+ }
+ } else if (type == CSSLOT_ENTITLEMENTS) {
+ if (ntohl(subBlob->magic) != CSMAGIC_EMBEDDED_ENTITLEMENTS) {
+ return EBADEXEC;
+ }
+ if (*rentitlements != NULL) {
+ printf("multiple entitlements blobs\n");
+ return EBADEXEC;
+ }
+ *rentitlements = subBlob;
}
}
} else if (ntohl(blob->magic) == CSMAGIC_CODEDIRECTORY) {
- if ((error = cs_validate_codedirectory((const CS_CodeDirectory *)(void *)addr, length)) != 0)
+ if ((error = cs_validate_codedirectory((const CS_CodeDirectory *)(const void *)addr, length)) != 0)
return error;
*rcd = (const CS_CodeDirectory *)blob;
} else {
if (*rcd == NULL)
return EBADEXEC;
+ *blob_size_p = blob_size;
+
return 0;
}
*
* Find an blob from the superblob/code directory. The blob must have
* been been validated by cs_validate_csblob() before calling
- * this. Use cs_find_blob() instead.
+ * this. Use csblob_find_blob() instead.
*
* Will also find a "raw" code directory if its stored as well as
* searching the superblob.
* NULL Buffer not found
*/
-static const CS_GenericBlob *
-cs_find_blob_bytes(const uint8_t *addr, size_t length, uint32_t type, uint32_t magic)
+const CS_GenericBlob *
+csblob_find_blob_bytes(const uint8_t *addr, size_t length, uint32_t type, uint32_t magic)
{
- const CS_GenericBlob *blob = (const CS_GenericBlob *)(void *)addr;
+ const CS_GenericBlob *blob = (const CS_GenericBlob *)(const void *)addr;
if (ntohl(blob->magic) == CSMAGIC_EMBEDDED_SIGNATURE) {
const CS_SuperBlob *sb = (const CS_SuperBlob *)blob;
uint32_t offset = ntohl(sb->index[n].offset);
if (length - sizeof(const CS_GenericBlob) < offset)
return NULL;
- blob = (const CS_GenericBlob *)(void *)(addr + offset);
+ blob = (const CS_GenericBlob *)(const void *)(addr + offset);
if (ntohl(blob->magic) != magic)
continue;
return blob;
}
-static const CS_GenericBlob *
-cs_find_blob(struct cs_blob *csblob, uint32_t type, uint32_t magic)
+const CS_GenericBlob *
+csblob_find_blob(struct cs_blob *csblob, uint32_t type, uint32_t magic)
{
if ((csblob->csb_flags & CS_VALID) == 0)
return NULL;
- return cs_find_blob_bytes((const uint8_t *)csblob->csb_mem_kaddr, csblob->csb_mem_size, type, magic);
+ return csblob_find_blob_bytes((const uint8_t *)csblob->csb_mem_kaddr, csblob->csb_mem_size, type, magic);
}
static const uint8_t *
-cs_find_special_slot(const CS_CodeDirectory *cd, uint32_t slot)
+find_special_slot(const CS_CodeDirectory *cd, size_t slotsize, uint32_t slot)
{
/* there is no zero special slot since that is the first code slot */
if (ntohl(cd->nSpecialSlots) < slot || slot == 0)
return NULL;
- return ((const uint8_t *)cd + ntohl(cd->hashOffset) - (SHA1_RESULTLEN * slot));
+ return ((const uint8_t *)cd + ntohl(cd->hashOffset) - (slotsize * slot));
}
-/*
- * CODESIGNING
- * End of routines to navigate code signing data structures in the kernel.
- */
-
-/*
- * ENTITLEMENTS
- * Routines to navigate entitlements in the kernel.
- */
-
-/* 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.
- */
-
-static uint8_t sha1_zero[SHA1_RESULTLEN] = { 0 };
+static uint8_t cshash_zero[CS_HASH_MAX_SIZE] = { 0 };
int
-cs_entitlements_blob_get(proc_t p, void **out_start, size_t *out_length)
+csblob_get_entitlements(struct cs_blob *csblob, void **out_start, size_t *out_length)
{
- uint8_t computed_hash[SHA1_RESULTLEN];
+ uint8_t computed_hash[CS_HASH_MAX_SIZE];
const CS_GenericBlob *entitlements;
const CS_CodeDirectory *code_dir;
- struct cs_blob *csblob;
const uint8_t *embedded_hash;
- SHA1_CTX context;
+ union cs_hash_union context;
*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;
+ if (csblob->csb_hashtype == NULL || csblob->csb_hashtype->cs_digest_size > sizeof(computed_hash))
+ return EBADEXEC;
- if ((code_dir = (const CS_CodeDirectory *)cs_find_blob(csblob, CSSLOT_CODEDIRECTORY, CSMAGIC_CODEDIRECTORY)) == NULL)
- return 0;
+ code_dir = csblob->csb_cd;
- entitlements = cs_find_blob(csblob, CSSLOT_ENTITLEMENTS, CSMAGIC_EMBEDDED_ENTITLEMENTS);
- embedded_hash = cs_find_special_slot(code_dir, CSSLOT_ENTITLEMENTS);
+ if ((csblob->csb_flags & CS_VALID) == 0) {
+ entitlements = NULL;
+ } else {
+ entitlements = csblob->csb_entitlements_blob;
+ }
+ embedded_hash = find_special_slot(code_dir, csblob->csb_hashtype->cs_size, CSSLOT_ENTITLEMENTS);
if (embedded_hash == NULL) {
if (entitlements)
return EBADEXEC;
return 0;
- } else if (entitlements == NULL && memcmp(embedded_hash, sha1_zero, SHA1_RESULTLEN) != 0) {
- return EBADEXEC;
+ } else if (entitlements == NULL) {
+ if (memcmp(embedded_hash, cshash_zero, csblob->csb_hashtype->cs_size) != 0) {
+ return EBADEXEC;
+ } else {
+ return 0;
+ }
}
- SHA1Init(&context);
- SHA1Update(&context, entitlements, ntohl(entitlements->length));
- SHA1Final(computed_hash, &context);
- if (memcmp(computed_hash, embedded_hash, SHA1_RESULTLEN) != 0)
+ csblob->csb_hashtype->cs_init(&context);
+ csblob->csb_hashtype->cs_update(&context, entitlements, ntohl(entitlements->length));
+ csblob->csb_hashtype->cs_final(computed_hash, &context);
+
+ if (memcmp(computed_hash, embedded_hash, csblob->csb_hashtype->cs_size) != 0)
return EBADEXEC;
- *out_start = (void *)entitlements;
+ *out_start = __DECONST(void *, entitlements);
*out_length = ntohl(entitlements->length);
return 0;
}
-/* Retrieve the codesign identity for a process.
- * Returns:
- * NULL an error occured
- * string the cs_identity
- */
-
-const char *
-cs_identity_get(proc_t p)
-{
- const CS_CodeDirectory *code_dir;
- struct cs_blob *csblob;
-
- if (NULL == p->p_textvp)
- return NULL;
-
- if ((csblob = ubc_cs_blob_get(p->p_textvp, -1, p->p_textoff)) == NULL)
- return NULL;
-
- if ((code_dir = (const CS_CodeDirectory *)cs_find_blob(csblob, CSSLOT_CODEDIRECTORY, CSMAGIC_CODEDIRECTORY)) == NULL)
- return NULL;
-
- if (code_dir->identOffset == 0)
- return NULL;
-
- return ((const char *)code_dir) + ntohl(code_dir->identOffset);
-}
-
-
-
-/* Retrieve the codesign blob for a process.
- * Returns:
- * EINVAL no text vnode associated with the process
- * 0 no error occurred
- *
- * On success, out_start and out_length will point to the
- * cms blob if found; or will be set to NULL/zero
- * if there were no blob.
- */
-
-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;
-}
-
-uint8_t *
-cs_get_cdhash(struct proc *p)
-{
- struct cs_blob *csblob;
-
- 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_sha1;
-}
-
/*
- * ENTITLEMENTS
- * End of routines to navigate entitlements in the kernel.
+ * CODESIGNING
+ * End of routines to navigate code signing data structures in the kernel.
*/
static int
ubc_info_init_internal(vnode_t vp, int withfsize, off_t filesize)
{
- register struct ubc_info *uip;
+ struct ubc_info *uip;
void * pager;
int error = 0;
kern_return_t kret;
ubc_info_free(uip);
}
+errno_t mach_to_bsd_errno(kern_return_t mach_err)
+{
+ switch (mach_err) {
+ case KERN_SUCCESS:
+ return 0;
+
+ case KERN_INVALID_ADDRESS:
+ case KERN_INVALID_ARGUMENT:
+ case KERN_NOT_IN_SET:
+ case KERN_INVALID_NAME:
+ case KERN_INVALID_TASK:
+ case KERN_INVALID_RIGHT:
+ case KERN_INVALID_VALUE:
+ case KERN_INVALID_CAPABILITY:
+ case KERN_INVALID_HOST:
+ case KERN_MEMORY_PRESENT:
+ case KERN_INVALID_PROCESSOR_SET:
+ case KERN_INVALID_POLICY:
+ case KERN_ALREADY_WAITING:
+ case KERN_DEFAULT_SET:
+ case KERN_EXCEPTION_PROTECTED:
+ case KERN_INVALID_LEDGER:
+ case KERN_INVALID_MEMORY_CONTROL:
+ case KERN_INVALID_SECURITY:
+ case KERN_NOT_DEPRESSED:
+ case KERN_LOCK_OWNED:
+ case KERN_LOCK_OWNED_SELF:
+ return EINVAL;
+
+ case KERN_PROTECTION_FAILURE:
+ case KERN_NOT_RECEIVER:
+ case KERN_NO_ACCESS:
+ case KERN_POLICY_STATIC:
+ return EACCES;
+
+ case KERN_NO_SPACE:
+ case KERN_RESOURCE_SHORTAGE:
+ case KERN_UREFS_OVERFLOW:
+ case KERN_INVALID_OBJECT:
+ return ENOMEM;
+
+ case KERN_FAILURE:
+ return EIO;
+
+ case KERN_MEMORY_FAILURE:
+ case KERN_POLICY_LIMIT:
+ case KERN_CODESIGN_ERROR:
+ return EPERM;
+
+ case KERN_MEMORY_ERROR:
+ return EBUSY;
+
+ case KERN_ALREADY_IN_SET:
+ case KERN_NAME_EXISTS:
+ case KERN_RIGHT_EXISTS:
+ return EEXIST;
+
+ case KERN_ABORTED:
+ return EINTR;
+
+ case KERN_TERMINATED:
+ case KERN_LOCK_SET_DESTROYED:
+ case KERN_LOCK_UNSTABLE:
+ case KERN_SEMAPHORE_DESTROYED:
+ return ENOENT;
+
+ case KERN_RPC_SERVER_TERMINATED:
+ return ECONNRESET;
+
+ case KERN_NOT_SUPPORTED:
+ return ENOTSUP;
+
+ case KERN_NODE_DOWN:
+ return ENETDOWN;
+
+ case KERN_NOT_WAITING:
+ return ENOENT;
+
+ case KERN_OPERATION_TIMED_OUT:
+ return ETIMEDOUT;
+
+ default:
+ return EIO;
+ }
+}
/*
- * ubc_setsize
+ * ubc_setsize_ex
*
- * Tell the VM that the the size of the file represented by the vnode has
+ * Tell the VM that the the size of the file represented by the vnode has
* changed
*
- * Parameters: vp The vp whose backing file size is
- * being changed
- * nsize The new size of the backing file
- *
- * Returns: 1 Success
- * 0 Failure
- *
- * Notes: This function will indicate failure if the new size that's
- * being attempted to be set is negative.
- *
- * This function will fail if there is no ubc_info currently
- * associated with the vnode.
- *
- * This function will indicate success it the new size is the
- * same or larger than the old size (in this case, the remainder
- * of the file will require modification or use of an existing upl
- * to access successfully).
- *
- * This function will fail if the new file size is smaller, and
- * the memory region being invalidated was unable to actually be
- * invalidated and/or the last page could not be flushed, if the
- * new size is not aligned to a page boundary. This is usually
- * indicative of an I/O error.
+ * Parameters: vp The vp whose backing file size is
+ * being changed
+ * nsize The new size of the backing file
+ * opts Options
+ *
+ * Returns: EINVAL for new size < 0
+ * ENOENT if no UBC info exists
+ * EAGAIN if UBC_SETSIZE_NO_FS_REENTRY option is set and new_size < old size
+ * Other errors (mapped to errno_t) returned by VM functions
+ *
+ * Notes: This function will indicate success if the new size is the
+ * same or larger than the old size (in this case, the
+ * remainder of the file will require modification or use of
+ * an existing upl to access successfully).
+ *
+ * This function will fail if the new file size is smaller,
+ * and the memory region being invalidated was unable to
+ * actually be invalidated and/or the last page could not be
+ * flushed, if the new size is not aligned to a page
+ * boundary. This is usually indicative of an I/O error.
*/
-int
-ubc_setsize(struct vnode *vp, off_t nsize)
+errno_t ubc_setsize_ex(struct vnode *vp, off_t nsize, ubc_setsize_opts_t opts)
{
off_t osize; /* ui_size before change */
off_t lastpg, olastpgend, lastoff;
kern_return_t kret = KERN_SUCCESS;
if (nsize < (off_t)0)
- return (0);
+ return EINVAL;
if (!UBCINFOEXISTS(vp))
- return (0);
+ return ENOENT;
uip = vp->v_ubcinfo;
osize = uip->ui_size;
+
+ if (ISSET(opts, UBC_SETSIZE_NO_FS_REENTRY) && nsize < osize)
+ return EAGAIN;
+
/*
* Update the size before flushing the VM
*/
lock_vnode_and_post(vp, NOTE_EXTEND);
}
- return (1); /* return success */
+ return 0;
}
/*
lastoff = (nsize & PAGE_MASK_64);
if (lastoff) {
- upl_t upl;
+ upl_t upl;
upl_page_info_t *pl;
-
- /*
+ /*
* new EOF ends up in the middle of a page
- * zero the tail of this page if its currently
+ * zero the tail of this page if it's currently
* present in the cache
*/
- kret = ubc_create_upl(vp, lastpg, PAGE_SIZE, &upl, &pl, UPL_SET_LITE);
-
+ kret = ubc_create_upl(vp, lastpg, PAGE_SIZE, &upl, &pl, UPL_SET_LITE);
+
if (kret != KERN_SUCCESS)
panic("ubc_setsize: ubc_create_upl (error = %d)\n", kret);
flags = MEMORY_OBJECT_DATA_FLUSH_ALL;
else
flags = MEMORY_OBJECT_DATA_FLUSH;
- /*
+ /*
* invalidate the pages beyond the new EOF page
*
*/
- kret = memory_object_lock_request(control,
- (memory_object_offset_t)lastpg,
- (memory_object_size_t)(olastpgend - lastpg), NULL, NULL,
- MEMORY_OBJECT_RETURN_NONE, flags, VM_PROT_NO_CHANGE);
+ kret = memory_object_lock_request(control,
+ (memory_object_offset_t)lastpg,
+ (memory_object_size_t)(olastpgend - lastpg), NULL, NULL,
+ MEMORY_OBJECT_RETURN_NONE, flags, VM_PROT_NO_CHANGE);
if (kret != KERN_SUCCESS)
printf("ubc_setsize: invalidate failed (error = %d)\n", kret);
}
- return ((kret == KERN_SUCCESS) ? 1 : 0);
+ return mach_to_bsd_errno(kret);
}
+// Returns true for success
+int ubc_setsize(vnode_t vp, off_t nsize)
+{
+ return ubc_setsize_ex(vp, nsize, 0) == 0;
+}
/*
* ubc_getsize
/*
* ubc_umount
*
- * Call ubc_sync_range(vp, 0, EOF, UBC_PUSHALL) on all the vnodes for this
+ * Call ubc_msync(vp, 0, EOF, NULL, UBC_PUSHALL) on all the vnodes for this
* mount point
*
* Parameters: mp The mount point
* This function is generally used only in the following cases:
*
* o a memory mapped file via the mmap() system call
- * o a memory mapped file via the deprecated map_fd() call
* o a swap store backing file
* o subsequent to a successful write via vn_write()
*
*
* o Because a page-in may occur prior to a write, the
* credential may not be set at this time, if the page-in
- * is not the result of a mapping established via mmap()
- * or map_fd().
+ * is not the result of a mapping established via mmap().
*
* In both these cases, this will be triggered from the paging
* path, which will instead use the credential of the current
return (0);
}
-
-/*
- * ubc_sync_range
- *
- * Clean and/or invalidate a range in the memory object that backs this vnode
- *
- * Parameters: vp The vnode whose associated ubc_info's
- * associated memory object is to have a
- * range invalidated within it
- * beg_off The start of the range, as an offset
- * end_off The end of the range, as an offset
- * flags See ubc_msync_internal()
- *
- * Returns: 1 Success
- * 0 Failure
- *
- * Notes: see ubc_msync_internal() for more detailed information.
- *
- * DEPRECATED: This interface is obsolete due to a failure to return error
- * information needed in order to correct failures. The currently
- * recommended interface is ubc_msync().
- */
-int
-ubc_sync_range(vnode_t vp, off_t beg_off, off_t end_off, int flags)
-{
- return (ubc_msync_internal(vp, beg_off, end_off, NULL, flags, NULL));
-}
-
-
/*
* ubc_msync
*
/*
+ * ubc_msync_internal
+ *
* Clean and/or invalidate a range in the memory object that backs this vnode
*
* Parameters: vp The vnode whose associated ubc_info's
/*
- * ubc_msync_internal
+ * ubc_map
*
* Explicitly map a vnode that has an associate ubc_info, and add a reference
* to it for the ubc system, if there isn't one already, so it will not be
* It is primarily used by:
*
* o mmap(), when mapping a file
- * o The deprecated map_fd() interface, when mapping a file
* o When mapping a shared file (a shared library in the
* shared segment region)
* o When loading a program image during the exec process
error = VNOP_MMAP(vp, flags, vfs_context_current());
- if (error != EPERM)
- error = 0;
+ /*
+ * rdar://problem/22587101 required that we stop propagating
+ * EPERM up the stack. Otherwise, we would have to funnel up
+ * the error at all the call sites for memory_object_map().
+ * The risk is in having to undo the map/object/entry state at
+ * all these call sites. It would also affect more than just mmap()
+ * e.g. vm_remap().
+ *
+ * if (error != EPERM)
+ * error = 0;
+ */
+
+ error = 0;
vnode_lock_spin(vp);
if ( !ISSET(uip->ui_flags, UI_ISMAPPED))
need_ref = 1;
SET(uip->ui_flags, (UI_WASMAPPED | UI_ISMAPPED));
+ if (flags & PROT_WRITE) {
+ SET(uip->ui_flags, UI_MAPPEDWRITE);
+ }
}
CLR(uip->ui_flags, UI_MAPBUSY);
if (need_wakeup)
wakeup(&uip->ui_flags);
- if (need_ref)
- vnode_ref(vp);
+ if (need_ref) {
+ /*
+ * Make sure we get a ref as we can't unwind from here
+ */
+ if (vnode_ref_ext(vp, 0, VNODE_REF_FORCE))
+ panic("%s : VNODE_REF_FORCE failed\n", __FUNCTION__);
+ }
}
return (error);
}
return;
if (UBCINFOEXISTS(vp)) {
+ bool want_fsevent = false;
+
vnode_lock(vp);
uip = vp->v_ubcinfo;
SET(uip->ui_flags, UI_MAPBUSY);
if (ISSET(uip->ui_flags, UI_ISMAPPED)) {
- CLR(uip->ui_flags, UI_ISMAPPED);
+ if (ISSET(uip->ui_flags, UI_MAPPEDWRITE))
+ want_fsevent = true;
+
need_rele = 1;
+
+ /*
+ * We want to clear the mapped flags after we've called
+ * VNOP_MNOMAP to avoid certain races and allow
+ * VNOP_MNOMAP to call ubc_is_mapped_writable.
+ */
}
vnode_unlock(vp);
-
+
if (need_rele) {
- (void)VNOP_MNOMAP(vp, vfs_context_current());
+ vfs_context_t ctx = vfs_context_current();
+
+ (void)VNOP_MNOMAP(vp, ctx);
+
+#if CONFIG_FSE
+ /*
+ * Why do we want an fsevent here? Normally the
+ * content modified fsevent is posted when a file is
+ * closed and only if it's written to via conventional
+ * means. It's perfectly legal to close a file and
+ * keep your mappings and we don't currently track
+ * whether it was written to via a mapping.
+ * Therefore, we need to post an fsevent here if the
+ * file was mapped writable. This may result in false
+ * events, i.e. we post a notification when nothing
+ * has really changed.
+ */
+ if (want_fsevent && need_fsevent(FSE_CONTENT_MODIFIED, vp)) {
+ add_fsevent(FSE_CONTENT_MODIFIED, ctx,
+ FSE_ARG_VNODE, vp,
+ FSE_ARG_DONE);
+ }
+#endif
+
vnode_rele(vp);
}
vnode_lock_spin(vp);
+ if (need_rele)
+ CLR(uip->ui_flags, UI_ISMAPPED | UI_MAPPEDWRITE);
+
CLR(uip->ui_flags, UI_MAPBUSY);
+
if (ISSET(uip->ui_flags, UI_MAPWAITING)) {
CLR(uip->ui_flags, UI_MAPWAITING);
need_wakeup = 1;
if (bufsize & 0xfff)
return KERN_INVALID_ARGUMENT;
- if (bufsize > MAX_UPL_SIZE * PAGE_SIZE)
+ if (bufsize > MAX_UPL_SIZE_BYTES)
return KERN_INVALID_ARGUMENT;
if (uplflags & (UPL_UBC_MSYNC | UPL_UBC_PAGEOUT | UPL_UBC_PAGEIN)) {
ubc_upl_maxbufsize(
void)
{
- return(MAX_UPL_SIZE * PAGE_SIZE);
+ return(MAX_UPL_SIZE_BYTES);
}
/*
kern_return_t kr;
pl = UPL_GET_INTERNAL_PAGE_LIST(upl);
- kr = upl_commit(upl, pl, MAX_UPL_SIZE);
+ kr = upl_commit(upl, pl, MAX_UPL_SIZE_BYTES >> PAGE_SHIFT);
upl_deallocate(upl);
return kr;
}
pl = UPL_GET_INTERNAL_PAGE_LIST(upl);
kr = upl_commit_range(upl, offset, size, flags,
- pl, MAX_UPL_SIZE, &empty);
+ pl, MAX_UPL_SIZE_BYTES >> PAGE_SHIFT, &empty);
if((flags & UPL_COMMIT_FREE_ON_EMPTY) && empty)
upl_deallocate(upl);
int
-UBCINFOEXISTS(struct vnode * vp)
+UBCINFOEXISTS(const struct vnode * vp)
{
return((vp) && ((vp)->v_type == VREG) && ((vp)->v_ubcinfo != UBC_INFO_NULL));
}
upl_range_needed(upl, index, count);
}
+boolean_t ubc_is_mapped(const struct vnode *vp, boolean_t *writable)
+{
+ if (!UBCINFOEXISTS(vp) || !ISSET(vp->v_ubcinfo->ui_flags, UI_ISMAPPED))
+ return FALSE;
+ if (writable)
+ *writable = ISSET(vp->v_ubcinfo->ui_flags, UI_MAPPEDWRITE);
+ return TRUE;
+}
+
+boolean_t ubc_is_mapped_writable(const struct vnode *vp)
+{
+ boolean_t writable;
+ return ubc_is_mapped(vp, &writable) && writable;
+}
+
/*
* CODE SIGNING
*/
-#define CS_BLOB_PAGEABLE 0
static volatile SInt32 cs_blob_size = 0;
static volatile SInt32 cs_blob_count = 0;
static SInt32 cs_blob_size_peak = 0;
static UInt32 cs_blob_size_max = 0;
static SInt32 cs_blob_count_peak = 0;
-int cs_validation = 1;
-
-#ifndef SECURE_KERNEL
-SYSCTL_INT(_vm, OID_AUTO, cs_validation, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_validation, 0, "Do validate code signatures");
-#endif
SYSCTL_INT(_vm, OID_AUTO, cs_blob_count, CTLFLAG_RD | CTLFLAG_LOCKED, (int *)(uintptr_t)&cs_blob_count, 0, "Current number of code signature blobs");
SYSCTL_INT(_vm, OID_AUTO, cs_blob_size, CTLFLAG_RD | CTLFLAG_LOCKED, (int *)(uintptr_t)&cs_blob_size, 0, "Current size of all code signature blobs");
SYSCTL_INT(_vm, OID_AUTO, cs_blob_count_peak, CTLFLAG_RD | CTLFLAG_LOCKED, &cs_blob_count_peak, 0, "Peak number of code signature blobs");
SYSCTL_INT(_vm, OID_AUTO, cs_blob_size_peak, CTLFLAG_RD | CTLFLAG_LOCKED, &cs_blob_size_peak, 0, "Peak size of code signature blobs");
SYSCTL_INT(_vm, OID_AUTO, cs_blob_size_max, CTLFLAG_RD | CTLFLAG_LOCKED, &cs_blob_size_max, 0, "Size of biggest code signature blob");
+/*
+ * Function: csblob_parse_teamid
+ *
+ * Description: This function returns a pointer to the team id
+ stored within the codedirectory of the csblob.
+ If the codedirectory predates team-ids, it returns
+ NULL.
+ This does not copy the name but returns a pointer to
+ it within the CD. Subsequently, the CD must be
+ available when this is used.
+*/
+
+static const char *
+csblob_parse_teamid(struct cs_blob *csblob)
+{
+ const CS_CodeDirectory *cd;
+
+ cd = csblob->csb_cd;
+
+ if (ntohl(cd->version) < CS_SUPPORTSTEAMID)
+ return NULL;
+
+ if (cd->teamOffset == 0)
+ return NULL;
+
+ const char *name = ((const char *)cd) + ntohl(cd->teamOffset);
+ if (cs_debug > 1)
+ printf("found team-id %s in cdblob\n", name);
+
+ return name;
+}
+
kern_return_t
ubc_cs_blob_allocate(
{
kern_return_t kr;
-#if CS_BLOB_PAGEABLE
- *blob_size_p = round_page(*blob_size_p);
- kr = kmem_alloc(kernel_map, blob_addr_p, *blob_size_p);
-#else /* CS_BLOB_PAGEABLE */
- *blob_addr_p = (vm_offset_t) kalloc(*blob_size_p);
+ *blob_addr_p = (vm_offset_t) kalloc_tag(*blob_size_p, VM_KERN_MEMORY_SECURITY);
if (*blob_addr_p == 0) {
kr = KERN_NO_SPACE;
} else {
kr = KERN_SUCCESS;
}
-#endif /* CS_BLOB_PAGEABLE */
return kr;
}
vm_offset_t blob_addr,
vm_size_t blob_size)
{
-#if CS_BLOB_PAGEABLE
- kmem_free(kernel_map, blob_addr, blob_size);
-#else /* CS_BLOB_PAGEABLE */
kfree((void *) blob_addr, blob_size);
-#endif /* CS_BLOB_PAGEABLE */
}
-
-int
-ubc_cs_sigpup_add(
- struct vnode *vp,
- vm_address_t address,
- vm_size_t size)
+
+/*
+ * Some codesigned files use a lowest common denominator page size of
+ * 4KiB, but can be used on systems that have a runtime page size of
+ * 16KiB. Since faults will only occur on 16KiB ranges in
+ * cs_validate_range(), we can convert the original Code Directory to
+ * a multi-level scheme where groups of 4 hashes are combined to form
+ * a new hash, which represents 16KiB in the on-disk file. This can
+ * reduce the wired memory requirement for the Code Directory by
+ * 75%. Care must be taken for binaries that use the "fourk" VM pager
+ * for unaligned access, which may still attempt to validate on
+ * non-16KiB multiples for compatibility with 3rd party binaries.
+ */
+static boolean_t
+ubc_cs_supports_multilevel_hash(struct cs_blob *blob)
{
- kern_return_t kr;
- struct ubc_info *uip;
- struct cs_blob *blob;
- memory_object_control_t control;
const CS_CodeDirectory *cd;
- int error;
- control = ubc_getobject(vp, UBC_FLAGS_NONE);
- if (control == MEMORY_OBJECT_CONTROL_NULL)
- return KERN_INVALID_ARGUMENT;
+ /*
+ * Only applies to binaries that ship as part of the OS,
+ * primarily the shared cache.
+ */
+ if (!blob->csb_platform_binary || blob->csb_teamid != NULL) {
+ return FALSE;
+ }
- if (memory_object_is_signed(control))
- return 0;
+ /*
+ * If the runtime page size matches the code signing page
+ * size, there is no work to do.
+ */
+ if (PAGE_SHIFT <= blob->csb_hash_pageshift) {
+ return FALSE;
+ }
- blob = (struct cs_blob *) kalloc(sizeof (struct cs_blob));
- if (blob == NULL)
- return ENOMEM;
+ cd = blob->csb_cd;
- /* fill in the new blob */
- blob->csb_cpu_type = CPU_TYPE_ANY;
- blob->csb_base_offset = 0;
- blob->csb_mem_size = size;
- blob->csb_mem_offset = 0;
- blob->csb_mem_handle = IPC_PORT_NULL;
- blob->csb_mem_kaddr = address;
- blob->csb_sigpup = 1;
-
/*
- * Validate the blob's contents
+ * There must be a valid integral multiple of hashes
*/
- cd = findCodeDirectory(
- (const CS_SuperBlob *) address,
- (char *) address,
- (char *) address + blob->csb_mem_size);
- if (cd == NULL) {
- /* no code directory => useless blob ! */
- error = EINVAL;
- goto out;
+ if (ntohl(cd->nCodeSlots) & (PAGE_MASK >> blob->csb_hash_pageshift)) {
+ return FALSE;
}
- blob->csb_flags = ntohl(cd->flags) | CS_VALID;
- blob->csb_end_offset = round_page(ntohl(cd->codeLimit));
- if((ntohl(cd->version) >= CS_SUPPORTSSCATTER) && (ntohl(cd->scatterOffset))) {
+ /*
+ * Scatter lists must also have ranges that have an integral number of hashes
+ */
+ if ((ntohl(cd->version) >= CS_SUPPORTSSCATTER) && (ntohl(cd->scatterOffset))) {
+
const SC_Scatter *scatter = (const SC_Scatter*)
- ((const char*)cd + ntohl(cd->scatterOffset));
- blob->csb_start_offset = ntohl(scatter->base) * PAGE_SIZE;
- } else {
- blob->csb_start_offset = (blob->csb_end_offset - (ntohl(cd->nCodeSlots) * PAGE_SIZE));
+ ((const char*)cd + ntohl(cd->scatterOffset));
+ /* iterate all scatter structs to make sure they are all aligned */
+ do {
+ uint32_t sbase = ntohl(scatter->base);
+ uint32_t scount = ntohl(scatter->count);
+
+ /* last scatter? */
+ if (scount == 0) {
+ break;
+ }
+
+ if (sbase & (PAGE_MASK >> blob->csb_hash_pageshift)) {
+ return FALSE;
+ }
+
+ if (scount & (PAGE_MASK >> blob->csb_hash_pageshift)) {
+ return FALSE;
+ }
+
+ scatter++;
+ } while(1);
}
- /*
- * We don't need to check with the policy module, since the input data is supposed to be already checked
- */
-
- vnode_lock(vp);
- if (! UBCINFOEXISTS(vp)) {
- vnode_unlock(vp);
- if (cs_debug)
- printf("out ubc object\n");
- error = ENOENT;
- goto out;
+ /* Covered range must be a multiple of the new page size */
+ if (ntohl(cd->codeLimit) & PAGE_MASK) {
+ return FALSE;
}
- uip = vp->v_ubcinfo;
- /* someone raced us to adding the code directory */
- if (uip->cs_blobs != NULL) {
- if (cs_debug)
- printf("sigpup: vnode already have CD ?\n");
- vnode_unlock(vp);
- error = EEXIST;
- goto out;
+ /* All checks pass */
+ return TRUE;
+}
+
+/*
+ * All state and preconditions were checked before, so this
+ * function cannot fail.
+ */
+static void
+ubc_cs_convert_to_multilevel_hash(struct cs_blob *blob)
+{
+ const CS_CodeDirectory *old_cd, *cd;
+ CS_CodeDirectory *new_cd;
+ const CS_GenericBlob *entitlements;
+ vm_offset_t new_blob_addr;
+ vm_size_t new_blob_size;
+ vm_size_t new_cdsize;
+ kern_return_t kr;
+ int error;
+ size_t length;
+
+ uint32_t hashes_per_new_hash_shift = (uint32_t)(PAGE_SHIFT - blob->csb_hash_pageshift);
+
+ if (cs_debug > 1) {
+ printf("CODE SIGNING: Attempting to convert Code Directory for %lu -> %lu page shift\n",
+ (unsigned long)blob->csb_hash_pageshift, (unsigned long)PAGE_SHIFT);
}
- blob->csb_next = uip->cs_blobs;
- uip->cs_blobs = blob;
+ old_cd = blob->csb_cd;
- OSAddAtomic(+1, &cs_blob_count);
- OSAddAtomic((SInt32) +blob->csb_mem_size, &cs_blob_size);
+ /* Up to the hashes, we can copy all data */
+ new_cdsize = ntohl(old_cd->hashOffset);
+ new_cdsize += (ntohl(old_cd->nCodeSlots) >> hashes_per_new_hash_shift) * old_cd->hashSize;
- /* mark this vnode's VM object as having "signed pages" */
- kr = memory_object_signed(uip->ui_control, TRUE);
+ new_blob_size = sizeof(CS_SuperBlob);
+ new_blob_size += sizeof(CS_BlobIndex);
+ new_blob_size += new_cdsize;
+
+ if (blob->csb_entitlements_blob) {
+ /* We need to add a slot for the entitlements */
+ new_blob_size += sizeof(CS_BlobIndex);
+ new_blob_size += ntohl(blob->csb_entitlements_blob->length);
+ }
+
+ kr = ubc_cs_blob_allocate(&new_blob_addr, &new_blob_size);
if (kr != KERN_SUCCESS) {
- vnode_unlock(vp);
- if (cs_debug)
- printf("sigpup: not signable ?\n");
- error = ENOENT;
- goto out;
+ if (cs_debug > 1) {
+ printf("CODE SIGNING: Failed to allocate memory for new Code Signing Blob: %d\n",
+ kr);
+ }
+ return;
}
- vnode_unlock(vp);
+ CS_SuperBlob *new_superblob;
- error = 0;
-out:
+ new_superblob = (CS_SuperBlob *)new_blob_addr;
+ new_superblob->magic = htonl(CSMAGIC_EMBEDDED_SIGNATURE);
+ new_superblob->length = htonl((uint32_t)new_blob_size);
+ if (blob->csb_entitlements_blob) {
+ vm_size_t ent_offset, cd_offset;
+
+ cd_offset = sizeof(CS_SuperBlob) + 2 * sizeof(CS_BlobIndex);
+ ent_offset = cd_offset + new_cdsize;
+
+ new_superblob->count = htonl(2);
+ new_superblob->index[0].type = htonl(CSSLOT_CODEDIRECTORY);
+ new_superblob->index[0].offset = htonl((uint32_t)cd_offset);
+ new_superblob->index[1].type = htonl(CSSLOT_ENTITLEMENTS);
+ new_superblob->index[1].offset = htonl((uint32_t)ent_offset);
+
+ memcpy((void *)(new_blob_addr + ent_offset), blob->csb_entitlements_blob, ntohl(blob->csb_entitlements_blob->length));
+
+ new_cd = (CS_CodeDirectory *)(new_blob_addr + cd_offset);
+ } else {
+ vm_size_t cd_offset;
+
+ cd_offset = sizeof(CS_SuperBlob) + 1 * sizeof(CS_BlobIndex);
+
+ new_superblob->count = htonl(1);
+ new_superblob->index[0].type = htonl(CSSLOT_CODEDIRECTORY);
+ new_superblob->index[0].offset = htonl((uint32_t)cd_offset);
+
+ new_cd = (CS_CodeDirectory *)new_blob_addr;
+ }
+
+ memcpy(new_cd, old_cd, ntohl(old_cd->hashOffset));
+
+ /* Update fields in the Code Directory structure */
+ new_cd->length = htonl((uint32_t)new_cdsize);
+
+ uint32_t nCodeSlots = ntohl(new_cd->nCodeSlots);
+ nCodeSlots >>= hashes_per_new_hash_shift;
+ new_cd->nCodeSlots = htonl(nCodeSlots);
+
+ new_cd->pageSize = PAGE_SHIFT; /* Not byte-swapped */
+
+ if ((ntohl(new_cd->version) >= CS_SUPPORTSSCATTER) && (ntohl(new_cd->scatterOffset))) {
+ SC_Scatter *scatter = (SC_Scatter*)
+ ((char *)new_cd + ntohl(new_cd->scatterOffset));
+ /* iterate all scatter structs to scale their counts */
+ do {
+ uint32_t scount = ntohl(scatter->count);
+ uint32_t sbase = ntohl(scatter->base);
+
+ /* last scatter? */
+ if (scount == 0) {
+ break;
+ }
+
+ scount >>= hashes_per_new_hash_shift;
+ scatter->count = htonl(scount);
+
+ sbase >>= hashes_per_new_hash_shift;
+ scatter->base = htonl(sbase);
+
+ scatter++;
+ } while(1);
+ }
+
+ /* For each group of hashes, hash them together */
+ const unsigned char *src_base = (const unsigned char *)old_cd + ntohl(old_cd->hashOffset);
+ unsigned char *dst_base = (unsigned char *)new_cd + ntohl(new_cd->hashOffset);
+
+ uint32_t hash_index;
+ for (hash_index = 0; hash_index < nCodeSlots; hash_index++) {
+ union cs_hash_union mdctx;
+
+ uint32_t source_hash_len = old_cd->hashSize << hashes_per_new_hash_shift;
+ const unsigned char *src = src_base + hash_index * source_hash_len;
+ unsigned char *dst = dst_base + hash_index * new_cd->hashSize;
+
+ blob->csb_hashtype->cs_init(&mdctx);
+ blob->csb_hashtype->cs_update(&mdctx, src, source_hash_len);
+ blob->csb_hashtype->cs_final(dst, &mdctx);
+ }
+
+ length = new_blob_size;
+ error = cs_validate_csblob((const uint8_t *)new_blob_addr, &length, &cd, &entitlements);
+ assert(length == new_blob_size);
if (error) {
- if (cs_debug)
- printf("sigpup: not signable ?\n");
- /* we failed; release what we allocated */
- if (blob) {
- kfree(blob, sizeof (*blob));
- blob = NULL;
+
+ if (cs_debug > 1) {
+ printf("CODE SIGNING: Failed to validate new Code Signing Blob: %d\n",
+ error);
}
+
+ ubc_cs_blob_deallocate(new_blob_addr, new_blob_size);
+ return;
}
- return error;
+ /* New Code Directory is ready for use, swap it out in the blob structure */
+ ubc_cs_blob_deallocate(blob->csb_mem_kaddr, blob->csb_mem_size);
+
+ blob->csb_mem_size = new_blob_size;
+ blob->csb_mem_kaddr = new_blob_addr;
+ blob->csb_cd = cd;
+ blob->csb_entitlements_blob = entitlements;
+
+ /* The blob has some cached attributes of the Code Directory, so update those */
+
+ blob->csb_hash_firstlevel_pagesize = blob->csb_hash_pagesize; /* Save the original page size */
+
+ blob->csb_hash_pagesize = PAGE_SIZE;
+ blob->csb_hash_pagemask = PAGE_MASK;
+ blob->csb_hash_pageshift = PAGE_SHIFT;
+ blob->csb_end_offset = ntohl(cd->codeLimit);
+ if((ntohl(cd->version) >= CS_SUPPORTSSCATTER) && (ntohl(cd->scatterOffset))) {
+ const SC_Scatter *scatter = (const SC_Scatter*)
+ ((const char*)cd + ntohl(cd->scatterOffset));
+ blob->csb_start_offset = ((off_t)ntohl(scatter->base)) * PAGE_SIZE;
+ } else {
+ blob->csb_start_offset = 0;
+ }
}
int
struct vnode *vp,
cpu_type_t cputype,
off_t base_offset,
- vm_address_t addr,
- off_t blob_offset,
- vm_size_t size)
+ vm_address_t *addr,
+ vm_size_t size,
+ struct image_params *imgp,
+ __unused int flags,
+ struct cs_blob **ret_blob)
{
kern_return_t kr;
struct ubc_info *uip;
struct cs_blob *blob, *oblob;
int error;
- ipc_port_t blob_handle;
- memory_object_size_t blob_size;
const CS_CodeDirectory *cd;
+ const CS_GenericBlob *entitlements;
off_t blob_start_offset, blob_end_offset;
- SHA1_CTX sha1ctxt;
+ union cs_hash_union mdctx;
+ boolean_t record_mtime;
+ size_t length;
- blob_handle = IPC_PORT_NULL;
+ record_mtime = FALSE;
+ if (ret_blob)
+ *ret_blob = NULL;
blob = (struct cs_blob *) kalloc(sizeof (struct cs_blob));
if (blob == NULL) {
return ENOMEM;
}
-#if CS_BLOB_PAGEABLE
- /* get a memory entry on the blob */
- blob_size = (memory_object_size_t) size;
- kr = mach_make_memory_entry_64(kernel_map,
- &blob_size,
- addr,
- VM_PROT_READ,
- &blob_handle,
- IPC_PORT_NULL);
- if (kr != KERN_SUCCESS) {
- error = ENOMEM;
- goto out;
- }
- if (memory_object_round_page(blob_size) !=
- (memory_object_size_t) round_page(size)) {
- printf("ubc_cs_blob_add: size mismatch 0x%llx 0x%lx !?\n",
- blob_size, (size_t)size);
- panic("XXX FBDP size mismatch 0x%llx 0x%lx\n", blob_size, (size_t)size);
- error = EINVAL;
- goto out;
- }
-#else
- blob_size = (memory_object_size_t) size;
- blob_handle = IPC_PORT_NULL;
-#endif
-
/* fill in the new blob */
blob->csb_cpu_type = cputype;
- blob->csb_sigpup = 0;
blob->csb_base_offset = base_offset;
- blob->csb_blob_offset = blob_offset;
blob->csb_mem_size = size;
blob->csb_mem_offset = 0;
- blob->csb_mem_handle = blob_handle;
- blob->csb_mem_kaddr = addr;
+ blob->csb_mem_kaddr = *addr;
blob->csb_flags = 0;
+ blob->csb_platform_binary = 0;
+ blob->csb_platform_path = 0;
+ blob->csb_teamid = NULL;
+ blob->csb_entitlements_blob = NULL;
+ blob->csb_entitlements = NULL;
+ /* Transfer ownership. Even on error, this function will deallocate */
+ *addr = 0;
+
/*
* Validate the blob's contents
*/
-
- error = cs_validate_csblob((const uint8_t *)addr, size, &cd);
+ length = (size_t) size;
+ error = cs_validate_csblob((const uint8_t *)blob->csb_mem_kaddr,
+ &length, &cd, &entitlements);
if (error) {
+
if (cs_debug)
printf("CODESIGNING: csblob invalid: %d\n", error);
- blob->csb_flags = 0;
- blob->csb_start_offset = 0;
- blob->csb_end_offset = 0;
- memset(blob->csb_sha1, 0, SHA1_RESULTLEN);
- /* let the vnode checker determine if the signature is valid or not */
+ /*
+ * The vnode checker can't make the rest of this function
+ * succeed if csblob validation failed, so bail */
+ goto out;
+
} else {
- const unsigned char *sha1_base;
- int sha1_size;
+ const unsigned char *md_base;
+ uint8_t hash[CS_HASH_MAX_SIZE];
+ int md_size;
+
+ size = (vm_size_t) length;
+ assert(size <= blob->csb_mem_size);
+ if (size < blob->csb_mem_size) {
+ vm_address_t new_blob_addr;
+ const CS_CodeDirectory *new_cd;
+ const CS_GenericBlob *new_entitlements;
+
+ kr = ubc_cs_blob_allocate(&new_blob_addr, &size);
+ if (kr != KERN_SUCCESS) {
+ if (cs_debug > 1) {
+ printf("CODE SIGNING: failed to "
+ "re-allocate blob (size "
+ "0x%llx->0x%llx) error 0x%x\n",
+ (uint64_t)blob->csb_mem_size,
+ (uint64_t)size,
+ kr);
+ }
+ } else {
+ memcpy(new_blob_addr, blob->csb_mem_kaddr, size);
+ if (cd == NULL) {
+ new_cd = NULL;
+ } else {
+ new_cd = ((uintptr_t)cd
+ - (uintptr_t)blob->csb_mem_kaddr
+ + (uintptr_t)new_blob_addr);
+ }
+ if (entitlements == NULL) {
+ new_entitlements = NULL;
+ } else {
+ new_entitlements = ((uintptr_t)entitlements
+ - (uintptr_t)blob->csb_mem_kaddr
+ + (uintptr_t)new_blob_addr);
+ }
+// printf("CODE SIGNING: %s:%d kaddr 0x%llx cd %p ents %p -> blob 0x%llx cd %p ents %p\n", __FUNCTION__, __LINE__, (uint64_t)blob->csb_mem_kaddr, cd, entitlements, (uint64_t)new_blob_addr, new_cd, new_entitlements);
+ ubc_cs_blob_deallocate(blob->csb_mem_kaddr,
+ blob->csb_mem_size);
+ blob->csb_mem_kaddr = new_blob_addr;
+ blob->csb_mem_size = size;
+ cd = new_cd;
+ entitlements = new_entitlements;
+ }
+ }
+ blob->csb_cd = cd;
+ blob->csb_entitlements_blob = entitlements; /* may be NULL, not yet validated */
+ blob->csb_hashtype = cs_find_md(cd->hashType);
+ if (blob->csb_hashtype == NULL || blob->csb_hashtype->cs_digest_size > sizeof(hash))
+ panic("validated CodeDirectory but unsupported type");
+
+ blob->csb_hash_pageshift = cd->pageSize;
+ blob->csb_hash_pagesize = (1U << cd->pageSize);
+ blob->csb_hash_pagemask = blob->csb_hash_pagesize - 1;
+ blob->csb_hash_firstlevel_pagesize = 0;
blob->csb_flags = (ntohl(cd->flags) & CS_ALLOWED_MACHO) | CS_VALID;
- blob->csb_end_offset = round_page(ntohl(cd->codeLimit));
+ blob->csb_end_offset = (((vm_offset_t)ntohl(cd->codeLimit) + blob->csb_hash_pagemask) & ~((vm_offset_t)blob->csb_hash_pagemask));
if((ntohl(cd->version) >= CS_SUPPORTSSCATTER) && (ntohl(cd->scatterOffset))) {
const SC_Scatter *scatter = (const SC_Scatter*)
((const char*)cd + ntohl(cd->scatterOffset));
- blob->csb_start_offset = ntohl(scatter->base) * PAGE_SIZE;
+ blob->csb_start_offset = ((off_t)ntohl(scatter->base)) * blob->csb_hash_pagesize;
} else {
- blob->csb_start_offset = (blob->csb_end_offset -
- (ntohl(cd->nCodeSlots) * PAGE_SIZE));
+ blob->csb_start_offset = 0;
}
- /* compute the blob's SHA1 hash */
- sha1_base = (const unsigned char *) cd;
- sha1_size = ntohl(cd->length);
- SHA1Init(&sha1ctxt);
- SHA1Update(&sha1ctxt, sha1_base, sha1_size);
- SHA1Final(blob->csb_sha1, &sha1ctxt);
+ /* compute the blob's cdhash */
+ md_base = (const unsigned char *) cd;
+ md_size = ntohl(cd->length);
+
+ blob->csb_hashtype->cs_init(&mdctx);
+ blob->csb_hashtype->cs_update(&mdctx, md_base, md_size);
+ blob->csb_hashtype->cs_final(hash, &mdctx);
+
+ memcpy(blob->csb_cdhash, hash, CS_CDHASH_LEN);
}
/*
* Let policy module check whether the blob's signature is accepted.
*/
#if CONFIG_MACF
- error = mac_vnode_check_signature(vp, base_offset, blob->csb_sha1, (void*)addr, size);
- if (error)
+ unsigned int cs_flags = blob->csb_flags;
+ error = mac_vnode_check_signature(vp, blob, imgp, &cs_flags, flags);
+ blob->csb_flags = cs_flags;
+
+ if (error) {
+ if (cs_debug)
+ printf("check_signature[pid: %d], error = %d\n", current_proc()->p_pid, error);
goto out;
+ }
+ if ((flags & MAC_VNODE_CHECK_DYLD_SIM) && !(blob->csb_flags & CS_PLATFORM_BINARY)) {
+ if (cs_debug)
+ printf("check_signature[pid: %d], is not apple signed\n", current_proc()->p_pid);
+ error = EPERM;
+ goto out;
+ }
#endif
+ if (blob->csb_flags & CS_PLATFORM_BINARY) {
+ if (cs_debug > 1)
+ printf("check_signature[pid: %d]: platform binary\n", current_proc()->p_pid);
+ blob->csb_platform_binary = 1;
+ blob->csb_platform_path = !!(blob->csb_flags & CS_PLATFORM_PATH);
+ } else {
+ blob->csb_platform_binary = 0;
+ blob->csb_platform_path = 0;
+ blob->csb_teamid = csblob_parse_teamid(blob);
+ if (cs_debug > 1) {
+ if (blob->csb_teamid)
+ printf("check_signature[pid: %d]: team-id is %s\n", current_proc()->p_pid, blob->csb_teamid);
+ else
+ printf("check_signature[pid: %d]: no team-id\n", current_proc()->p_pid);
+ }
+ }
+
/*
* Validate the blob's coverage
*/
goto out;
}
+ if (ubc_cs_supports_multilevel_hash(blob)) {
+ ubc_cs_convert_to_multilevel_hash(blob);
+ }
+
vnode_lock(vp);
if (! UBCINFOEXISTS(vp)) {
vnode_unlock(vp);
oblob = oblob->csb_next) {
off_t oblob_start_offset, oblob_end_offset;
+ /* check for conflicting teamid */
+ if (blob->csb_platform_binary) { //platform binary needs to be the same for app slices
+ if (!oblob->csb_platform_binary) {
+ vnode_unlock(vp);
+ error = EALREADY;
+ goto out;
+ }
+ } else if (blob->csb_teamid) { //teamid binary needs to be the same for app slices
+ if (oblob->csb_platform_binary ||
+ oblob->csb_teamid == NULL ||
+ strcmp(oblob->csb_teamid, blob->csb_teamid) != 0) {
+ vnode_unlock(vp);
+ error = EALREADY;
+ goto out;
+ }
+ } else { // non teamid binary needs to be the same for app slices
+ if (oblob->csb_platform_binary ||
+ oblob->csb_teamid != NULL) {
+ vnode_unlock(vp);
+ error = EALREADY;
+ goto out;
+ }
+ }
+
oblob_start_offset = (oblob->csb_base_offset +
oblob->csb_start_offset);
oblob_end_offset = (oblob->csb_base_offset +
(blob->csb_cpu_type == CPU_TYPE_ANY ||
oblob->csb_cpu_type == CPU_TYPE_ANY ||
blob->csb_cpu_type == oblob->csb_cpu_type) &&
- !bcmp(blob->csb_sha1,
- oblob->csb_sha1,
- SHA1_RESULTLEN)) {
+ !bcmp(blob->csb_cdhash,
+ oblob->csb_cdhash,
+ CS_CDHASH_LEN)) {
/*
* We already have this blob:
* we'll return success but
*/
oblob->csb_cpu_type = cputype;
}
- /*
- * If the same blob moved around in the Mach-O, we
- * want to remember the new blob offset to avoid
- * coming back here again and again.
- */
- oblob->csb_blob_offset = blob_offset;
-
vnode_unlock(vp);
+ if (ret_blob)
+ *ret_blob = oblob;
error = EAGAIN;
goto out;
} else {
/* different blob: reject the new one */
- char pathbuf[MAXPATHLEN];
- char new_sha1_str[2*SHA1_RESULTLEN+1];
- char old_sha1_str[2*SHA1_RESULTLEN+1];
- char arch_str[20];
- const char *pathp = "?unknown";
- int pblen = sizeof(pathbuf);
- if (vn_getpath(vp, pathbuf, &pblen) == 0) {
- /* pblen == strlen(pathbuf) + 1. Assume strlen(pathbuf) > 0 */
- for (pathp = pathbuf + pblen - 2; pathp > pathbuf && pathp[-1] != '/'; pathp--) ;
- }
- snprintf(arch_str, sizeof(arch_str), "%x", cputype);
- hex_str(oblob->csb_sha1, SHA1_RESULTLEN, old_sha1_str);
- hex_str(blob->csb_sha1, SHA1_RESULTLEN, new_sha1_str);
- kern_asl_msg(LOG_NOTICE, "messagetracer",
- 6,
- "com.apple.message.domain", "com.apple.kernel.cs.replace",
- "com.apple.message.signature", pathp,
- "com.apple.message.signature2", arch_str,
- "com.apple.message.signature3", old_sha1_str,
- "com.apple.message.result", new_sha1_str,
- "com.apple.message.summarize", "YES",
- NULL
- );
- printf("CODESIGNING: rejected new signature for architecture %d of file %s\n",
- cputype, pathbuf);
vnode_unlock(vp);
error = EALREADY;
goto out;
}
+
/* mark this vnode's VM object as having "signed pages" */
kr = memory_object_signed(uip->ui_control, TRUE);
if (kr != KERN_SUCCESS) {
goto out;
}
+ if (uip->cs_blobs == NULL) {
+ /* loading 1st blob: record the file's current "modify time" */
+ record_mtime = TRUE;
+ }
+
+ /* set the generation count for cs_blobs */
+ uip->cs_add_gen = cs_blob_generation_count;
+
/*
* Add this blob to the list of blobs for this vnode.
* We always add at the front of the list and we never remove a
vnode_unlock(vp);
+ if (record_mtime) {
+ vnode_mtime(vp, &uip->cs_mtime, vfs_context_current());
+ }
+
+ if (ret_blob)
+ *ret_blob = blob;
+
error = 0; /* success ! */
out:
if (error) {
+ if (cs_debug)
+ printf("check_signature[pid: %d]: error = %d\n", current_proc()->p_pid, error);
+
/* we failed; release what we allocated */
if (blob) {
+ if (blob->csb_mem_kaddr) {
+ ubc_cs_blob_deallocate(blob->csb_mem_kaddr, blob->csb_mem_size);
+ blob->csb_mem_kaddr = 0;
+ }
+ if (blob->csb_entitlements != NULL) {
+ osobject_release(blob->csb_entitlements);
+ blob->csb_entitlements = NULL;
+ }
kfree(blob, sizeof (*blob));
blob = NULL;
}
- if (blob_handle != IPC_PORT_NULL) {
- mach_memory_entry_port_release(blob_handle);
- blob_handle = IPC_PORT_NULL;
- }
}
if (error == EAGAIN) {
* blob and we want to return success.
*/
error = 0;
- /*
- * Since we're not failing, consume the data we received.
- */
- ubc_cs_blob_deallocate(addr, size);
}
return error;
}
+void
+csvnode_print_debug(struct vnode *vp)
+{
+ const char *name = NULL;
+ struct ubc_info *uip;
+ struct cs_blob *blob;
+
+ name = vnode_getname_printable(vp);
+ if (name) {
+ printf("csvnode: name: %s\n", name);
+ vnode_putname_printable(name);
+ }
+
+ vnode_lock_spin(vp);
+
+ if (! UBCINFOEXISTS(vp)) {
+ blob = NULL;
+ goto out;
+ }
+
+ uip = vp->v_ubcinfo;
+ for (blob = uip->cs_blobs; blob != NULL; blob = blob->csb_next) {
+ printf("csvnode: range: %lu -> %lu flags: 0x%08x platform: %s path: %s team: %s\n",
+ (unsigned long)blob->csb_start_offset,
+ (unsigned long)blob->csb_end_offset,
+ blob->csb_flags,
+ blob->csb_platform_binary ? "yes" : "no",
+ blob->csb_platform_path ? "yes" : "no",
+ blob->csb_teamid ? blob->csb_teamid : "<NO-TEAM>");
+ }
+
+out:
+ vnode_unlock(vp);
+
+}
struct cs_blob *
ubc_cs_blob_get(
}
}
- if (cs_debug && blob != NULL && blob->csb_sigpup)
- printf("found sig pup blob\n");
out:
vnode_unlock(vp);
blob != NULL;
blob = next_blob) {
next_blob = blob->csb_next;
- if (blob->csb_mem_kaddr != 0 && !blob->csb_sigpup) {
+ if (blob->csb_mem_kaddr != 0) {
ubc_cs_blob_deallocate(blob->csb_mem_kaddr,
blob->csb_mem_size);
blob->csb_mem_kaddr = 0;
}
- if (blob->csb_mem_handle != IPC_PORT_NULL) {
- mach_memory_entry_port_release(blob->csb_mem_handle);
+ if (blob->csb_entitlements != NULL) {
+ osobject_release(blob->csb_entitlements);
+ blob->csb_entitlements = NULL;
}
- blob->csb_mem_handle = IPC_PORT_NULL;
OSAddAtomic(-1, &cs_blob_count);
OSAddAtomic((SInt32) -blob->csb_mem_size, &cs_blob_size);
kfree(blob, sizeof (*blob));
uip->cs_blobs = NULL;
}
+/* check cs blob generation on vnode
+ * returns:
+ * 0 : Success, the cs_blob attached is current
+ * ENEEDAUTH : Generation count mismatch. Needs authentication again.
+ */
+int
+ubc_cs_generation_check(
+ struct vnode *vp)
+{
+ int retval = ENEEDAUTH;
+
+ vnode_lock_spin(vp);
+
+ if (UBCINFOEXISTS(vp) && vp->v_ubcinfo->cs_add_gen == cs_blob_generation_count) {
+ retval = 0;
+ }
+
+ vnode_unlock(vp);
+ return retval;
+}
+
+int
+ubc_cs_blob_revalidate(
+ struct vnode *vp,
+ struct cs_blob *blob,
+ struct image_params *imgp,
+ int flags
+ )
+{
+ int error = 0;
+ const CS_CodeDirectory *cd = NULL;
+ const CS_GenericBlob *entitlements = NULL;
+ size_t size;
+ assert(vp != NULL);
+ assert(blob != NULL);
+
+ size = blob->csb_mem_size;
+ error = cs_validate_csblob((const uint8_t *)blob->csb_mem_kaddr,
+ &size, &cd, &entitlements);
+ if (error) {
+ if (cs_debug) {
+ printf("CODESIGNING: csblob invalid: %d\n", error);
+ }
+ goto out;
+ }
+ assert(size == blob->csb_mem_size);
+
+ unsigned int cs_flags = (ntohl(cd->flags) & CS_ALLOWED_MACHO) | CS_VALID;
+
+ /* callout to mac_vnode_check_signature */
+#if CONFIG_MACF
+ error = mac_vnode_check_signature(vp, blob, imgp, &cs_flags, flags);
+ if (cs_debug && error) {
+ printf("revalidate: check_signature[pid: %d], error = %d\n", current_proc()->p_pid, error);
+ }
+#else
+ (void)flags;
+#endif
+
+ /* update generation number if success */
+ vnode_lock_spin(vp);
+ blob->csb_flags = cs_flags;
+ if (UBCINFOEXISTS(vp)) {
+ if (error == 0)
+ vp->v_ubcinfo->cs_add_gen = cs_blob_generation_count;
+ else
+ vp->v_ubcinfo->cs_add_gen = 0;
+ }
+
+ vnode_unlock(vp);
+
+out:
+ return error;
+}
+
+void
+cs_blob_reset_cache()
+{
+ /* incrementing odd no by 2 makes sure '0' is never reached. */
+ OSAddAtomic(+2, &cs_blob_generation_count);
+ printf("Reseting cs_blob cache from all vnodes. \n");
+}
+
struct cs_blob *
ubc_get_cs_blobs(
struct vnode *vp)
return blobs;
}
+void
+ubc_get_cs_mtime(
+ struct vnode *vp,
+ struct timespec *cs_mtime)
+{
+ struct ubc_info *uip;
+
+ if (! UBCINFOEXISTS(vp)) {
+ cs_mtime->tv_sec = 0;
+ cs_mtime->tv_nsec = 0;
+ return;
+ }
+
+ uip = vp->v_ubcinfo;
+ cs_mtime->tv_sec = uip->cs_mtime.tv_sec;
+ cs_mtime->tv_nsec = uip->cs_mtime.tv_nsec;
+}
+
unsigned long cs_validate_page_no_hash = 0;
unsigned long cs_validate_page_bad_hash = 0;
-boolean_t
-cs_validate_page(
- void *_blobs,
+static boolean_t
+cs_validate_hash(
+ struct cs_blob *blobs,
memory_object_t pager,
memory_object_offset_t page_offset,
const void *data,
- boolean_t *tainted)
+ vm_size_t *bytes_processed,
+ unsigned *tainted)
{
- SHA1_CTX sha1ctxt;
- unsigned char actual_hash[SHA1_RESULTLEN];
- unsigned char expected_hash[SHA1_RESULTLEN];
+ union cs_hash_union mdctx;
+ struct cs_hash const *hashtype = NULL;
+ unsigned char actual_hash[CS_HASH_MAX_SIZE];
+ unsigned char expected_hash[CS_HASH_MAX_SIZE];
boolean_t found_hash;
- struct cs_blob *blobs, *blob;
+ struct cs_blob *blob;
const CS_CodeDirectory *cd;
- const CS_SuperBlob *embedded;
const unsigned char *hash;
boolean_t validated;
off_t offset; /* page offset in the file */
size_t size;
off_t codeLimit = 0;
- char *lower_bound, *upper_bound;
+ const char *lower_bound, *upper_bound;
vm_offset_t kaddr, blob_addr;
- vm_size_t ksize;
- kern_return_t kr;
-
- offset = page_offset;
/* retrieve the expected hash */
found_hash = FALSE;
- blobs = (struct cs_blob *) _blobs;
for (blob = blobs;
blob != NULL;
continue;
}
- /* map the blob in the kernel address space */
+ /* blob data has been released */
kaddr = blob->csb_mem_kaddr;
if (kaddr == 0) {
- ksize = (vm_size_t) (blob->csb_mem_size +
- blob->csb_mem_offset);
- kr = vm_map(kernel_map,
- &kaddr,
- ksize,
- 0,
- VM_FLAGS_ANYWHERE,
- blob->csb_mem_handle,
- 0,
- TRUE,
- VM_PROT_READ,
- VM_PROT_READ,
- VM_INHERIT_NONE);
- if (kr != KERN_SUCCESS) {
- /* XXX FBDP what to do !? */
- printf("cs_validate_page: failed to map blob, "
- "size=0x%lx kr=0x%x\n",
- (size_t)blob->csb_mem_size, kr);
- break;
- }
+ continue;
}
- if (blob->csb_sigpup && cs_debug)
- printf("checking for a sigpup CD\n");
blob_addr = kaddr + blob->csb_mem_offset;
-
lower_bound = CAST_DOWN(char *, blob_addr);
upper_bound = lower_bound + blob->csb_mem_size;
-
- embedded = (const CS_SuperBlob *) blob_addr;
- cd = findCodeDirectory(embedded, lower_bound, upper_bound);
+
+ cd = blob->csb_cd;
if (cd != NULL) {
- if (cd->pageSize != PAGE_SHIFT ||
- cd->hashType != CS_HASHTYPE_SHA1 ||
- cd->hashSize != SHA1_RESULTLEN) {
- /* bogus blob ? */
- if (blob->csb_sigpup && cs_debug)
- printf("page foo bogus sigpup CD\n");
- continue;
- }
+ /* all CD's that have been injected is already validated */
- offset = page_offset - blob->csb_base_offset;
- if (offset < blob->csb_start_offset ||
- offset >= blob->csb_end_offset) {
- /* our page is not covered by this blob */
- if (blob->csb_sigpup && cs_debug)
- printf("OOB sigpup CD\n");
- continue;
- }
+ hashtype = blob->csb_hashtype;
+ if (hashtype == NULL)
+ panic("unknown hash type ?");
+ if (hashtype->cs_digest_size > sizeof(actual_hash))
+ panic("hash size too large");
+ if (offset & blob->csb_hash_pagemask)
+ panic("offset not aligned to cshash boundary");
codeLimit = ntohl(cd->codeLimit);
- if (blob->csb_sigpup && cs_debug)
- printf("sigpup codesize %d\n", (int)codeLimit);
- hash = hashes(cd, (unsigned)atop(offset),
+ hash = hashes(cd, (uint32_t)(offset>>blob->csb_hash_pageshift),
+ hashtype->cs_size,
lower_bound, upper_bound);
if (hash != NULL) {
- bcopy(hash, expected_hash,
- sizeof (expected_hash));
+ bcopy(hash, expected_hash, hashtype->cs_size);
found_hash = TRUE;
- if (blob->csb_sigpup && cs_debug)
- printf("sigpup hash\n");
}
break;
- } else {
- if (blob->csb_sigpup && cs_debug)
- printf("sig pup had no valid CD\n");
-
}
}
pager, page_offset);
}
validated = FALSE;
- *tainted = FALSE;
+ *tainted = 0;
} else {
- size = PAGE_SIZE;
+ *tainted = 0;
+
+ size = blob->csb_hash_pagesize;
+ *bytes_processed = size;
+
+ const uint32_t *asha1, *esha1;
if ((off_t)(offset + size) > codeLimit) {
/* partial page at end of segment */
assert(offset < codeLimit);
- size = (size_t) (codeLimit & PAGE_MASK);
+ size = (size_t) (codeLimit & blob->csb_hash_pagemask);
+ *tainted |= CS_VALIDATE_NX;
}
- /* compute the actual page's SHA1 hash */
- SHA1Init(&sha1ctxt);
- SHA1UpdateUsePhysicalAddress(&sha1ctxt, data, size);
- SHA1Final(actual_hash, &sha1ctxt);
-
- if (bcmp(expected_hash, actual_hash, SHA1_RESULTLEN) != 0) {
- char asha1_str[2*SHA1_RESULTLEN+1];
- char esha1_str[2*SHA1_RESULTLEN+1];
- hex_str(actual_hash, SHA1_RESULTLEN, asha1_str);
- hex_str(expected_hash, SHA1_RESULTLEN, esha1_str);
+
+ hashtype->cs_init(&mdctx);
+
+ if (blob->csb_hash_firstlevel_pagesize) {
+ const unsigned char *partial_data = (const unsigned char *)data;
+ size_t i;
+ for (i=0; i < size;) {
+ union cs_hash_union partialctx;
+ unsigned char partial_digest[CS_HASH_MAX_SIZE];
+ size_t partial_size = MIN(size-i, blob->csb_hash_firstlevel_pagesize);
+
+ hashtype->cs_init(&partialctx);
+ hashtype->cs_update(&partialctx, partial_data, partial_size);
+ hashtype->cs_final(partial_digest, &partialctx);
+
+ /* Update cumulative multi-level hash */
+ hashtype->cs_update(&mdctx, partial_digest, hashtype->cs_size);
+ partial_data = partial_data + partial_size;
+ i += partial_size;
+ }
+ } else {
+ hashtype->cs_update(&mdctx, data, size);
+ }
+ hashtype->cs_final(actual_hash, &mdctx);
+
+ asha1 = (const uint32_t *) actual_hash;
+ esha1 = (const uint32_t *) expected_hash;
+
+ if (bcmp(expected_hash, actual_hash, hashtype->cs_size) != 0) {
if (cs_debug) {
printf("CODE SIGNING: cs_validate_page: "
- "mobj %p off 0x%llx size 0x%lx: actual %s expected %s\n",
- pager, page_offset, size, asha1_str, esha1_str);
+ "mobj %p off 0x%llx size 0x%lx: "
+ "actual [0x%x 0x%x 0x%x 0x%x 0x%x] != "
+ "expected [0x%x 0x%x 0x%x 0x%x 0x%x]\n",
+ pager, page_offset, size,
+ asha1[0], asha1[1], asha1[2],
+ asha1[3], asha1[4],
+ esha1[0], esha1[1], esha1[2],
+ esha1[3], esha1[4]);
}
cs_validate_page_bad_hash++;
- if (!*tainted) {
- char page_offset_str[20];
- snprintf(page_offset_str, sizeof(page_offset_str), "%llx", page_offset);
- kern_asl_msg(LOG_NOTICE, "messagetracer",
- 5,
- "com.apple.message.domain", "com.apple.kernel.cs.mismatch",
- "com.apple.message.signature", page_offset_str,
- "com.apple.message.signature2", asha1_str,
- "com.apple.message.signature3", esha1_str,
- "com.apple.message.summarize", "YES",
- NULL
- );
- }
- *tainted = TRUE;
+ *tainted |= CS_VALIDATE_TAINTED;
} else {
if (cs_debug > 10) {
printf("CODE SIGNING: cs_validate_page: "
"SHA1 OK\n",
pager, page_offset, size);
}
- *tainted = FALSE;
}
validated = TRUE;
}
return validated;
}
+boolean_t
+cs_validate_range(
+ struct vnode *vp,
+ memory_object_t pager,
+ memory_object_offset_t page_offset,
+ const void *data,
+ vm_size_t dsize,
+ unsigned *tainted)
+{
+ vm_size_t offset_in_range;
+ boolean_t all_subranges_validated = TRUE; /* turn false if any subrange fails */
+
+ struct cs_blob *blobs = ubc_get_cs_blobs(vp);
+
+ *tainted = 0;
+
+ for (offset_in_range = 0;
+ offset_in_range < dsize;
+ /* offset_in_range updated based on bytes processed */) {
+ unsigned subrange_tainted = 0;
+ boolean_t subrange_validated;
+ vm_size_t bytes_processed = 0;
+
+ subrange_validated = cs_validate_hash(blobs,
+ pager,
+ page_offset + offset_in_range,
+ (const void *)((const char *)data + offset_in_range),
+ &bytes_processed,
+ &subrange_tainted);
+
+ *tainted |= subrange_tainted;
+
+ if (bytes_processed == 0) {
+ /* Cannote make forward progress, so return an error */
+ all_subranges_validated = FALSE;
+ break;
+ } else if (subrange_validated == FALSE) {
+ all_subranges_validated = FALSE;
+ /* Keep going to detect other types of failures in subranges */
+ }
+
+ offset_in_range += bytes_processed;
+ }
+
+ return all_subranges_validated;
+}
+
int
ubc_cs_getcdhash(
vnode_t vp,
ret = EBADEXEC; /* XXX any better error ? */
} else {
/* get the SHA1 hash of that blob */
- bcopy(blob->csb_sha1, cdhash, sizeof (blob->csb_sha1));
+ bcopy(blob->csb_cdhash, cdhash, sizeof (blob->csb_cdhash));
ret = 0;
}
return ret;
}
+boolean_t
+ubc_cs_is_range_codesigned(
+ vnode_t vp,
+ mach_vm_offset_t start,
+ mach_vm_size_t size)
+{
+ struct cs_blob *csblob;
+ mach_vm_offset_t blob_start;
+ mach_vm_offset_t blob_end;
+
+ if (vp == NULL) {
+ /* no file: no code signature */
+ return FALSE;
+ }
+ if (size == 0) {
+ /* no range: no code signature */
+ return FALSE;
+ }
+ if (start + size < start) {
+ /* overflow */
+ return FALSE;
+ }
+
+ csblob = ubc_cs_blob_get(vp, -1, start);
+ if (csblob == NULL) {
+ return FALSE;
+ }
+
+ /*
+ * We currently check if the range is covered by a single blob,
+ * which should always be the case for the dyld shared cache.
+ * If we ever want to make this routine handle other cases, we
+ * would have to iterate if the blob does not cover the full range.
+ */
+ blob_start = (mach_vm_offset_t) (csblob->csb_base_offset +
+ csblob->csb_start_offset);
+ blob_end = (mach_vm_offset_t) (csblob->csb_base_offset +
+ csblob->csb_end_offset);
+ if (blob_start > start || blob_end < (start + size)) {
+ /* range not fully covered by this code-signing blob */
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
#if CHECK_CS_VALIDATION_BITMAP
#define stob(s) ((atop_64((s)) + 07) >> 3)
extern boolean_t root_fs_upgrade_try;
projects / apple / xnu.git / blobdiff