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Rewrite package2.c

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This commit is contained in:
TuxSH 2018-05-09 00:19:51 +02:00
parent a39ad22841
commit 77faa00a57
3 changed files with 102 additions and 88 deletions
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2
fusee/fusee-secondary/src/nxboot.c
View file

@ -60,7 +60,7 @@ void nxboot_main(void) {
derive_nx_keydata(MAILBOX_EXOSPHERE_CONFIGURATION->target_firmware);
/* Patch package2, adding thermosphere + custom KIPs. */
package2_patch((void *)loader_ctx->package2_loadfile.load_address);
package2_rebuild_and_copy((void *)loader_ctx->package2_loadfile.load_address);
/* Boot up Exosphere. */
MAILBOX_NX_BOOTLOADER_IS_SECMON_AWAKE = 0;

184
fusee/fusee-secondary/src/package2.c
View file

@ -7,56 +7,76 @@
#include "kip.h"
#include "se.h"
/* Stage 2 executes from DRAM, so we have tons of space. */
/* This *greatly* simplifies logic. */
static uint8_t *g_patched_package2;
static uint8_t *g_package2_sections[PACKAGE2_SECTION_MAX];
static void package2_decrypt(package2_header_t *package2);
static size_t package2_get_thermosphere(void **thermosphere);
static void package2_patch_kernel(void *kernel, size_t kernel_size);
static ini1_header_t *package2_rebuild_ini1(ini1_header_t *ini1);
static void package2_append_section(size_t id, package2_header_t *package2, void *data, size_t size);
static void package2_fixup_header_and_section_hashes(package2_header_t *package2, size_t size);
static package2_header_t *g_patched_package2_header;
void package2_rebuild_and_copy(void *package2_address) {
uintptr_t pk2da = (uintptr_t)package2_address + sizeof(package2_header_t);
package2_header_t *package2 = (package2_header_t *)package2_address;
package2_header_t *rebuilt_package2;
size_t rebuilt_package2_size;
void *kernel;
size_t kernel_size;
void *thermosphere;
size_t thermosphere_size;
ini1_header_t *rebuilt_ini1;
void package2_decrypt(void *package2_address);
void package2_add_thermosphere_section(void);
void package2_patch_kernel(void);
void package2_patch_ini1(void);
void package2_fixup_header_and_section_hashes(void);
void package2_allocate_mem(void) {
/* TODO: call it */
g_patched_package2 = (uint8_t *)malloc(PACKAGE2_SIZE_MAX);
for(size_t i = 0; i < PACKAGE2_SECTION_MAX; i++) {
g_package2_sections[i] = (uint8_t *)malloc(PACKAGE2_SIZE_MAX);
}
g_patched_package2_header = (package2_header_t *)g_patched_package2;
}
void package2_free_mem(void) {
free(g_patched_package2);
for(size_t i = 0; i < PACKAGE2_SECTION_MAX; i++) {
free(g_package2_sections[i]);
}
g_patched_package2_header = NULL;
}
void package2_patch(void *package2_address) {
/* First things first: Decrypt Package2. */
package2_decrypt(package2_address);
/* First things first: Decrypt Package2 in place. */
package2_decrypt(package2);
kernel = (void *)(pk2da + package2->metadata.section_offsets[PACKAGE2_SECTION_KERNEL]);
kernel_size = package2->metadata.section_sizes[PACKAGE2_SECTION_KERNEL];
/* Modify Package2 to add an additional thermosphere section. */
package2_add_thermosphere_section();
thermosphere_size = package2_get_thermosphere(&thermosphere);
if (thermosphere_size != 0 && package2->metadata.section_sizes[PACKAGE2_SECTION_UNUSED] != 0) {
printf(u8"Error: Package2 has no unused section for Thermosphère!\n");
generic_panic();
}
/* Perform any patches we want to the NX kernel. */
package2_patch_kernel();
package2_patch_kernel(kernel, kernel_size);
/* Perform any patches we want to the INI1 (This is where our built-in sysmodules will be added.) */
package2_patch_ini1();
/* Perform any patches to the INI1, rebuilding it (This is where our built-in sysmodules will be added.) */
rebuilt_ini1 = package2_rebuild_ini1((ini1_header_t *)(pk2da + package2->metadata.section_offsets[PACKAGE2_SECTION_INI1]));
/* Allocate the rebuilt package2. */
rebuilt_package2_size = sizeof(package2_header_t);
rebuilt_package2_size += package2->metadata.section_sizes[PACKAGE2_SECTION_KERNEL] + thermosphere_size + rebuilt_ini1->size;
if (rebuilt_package2_size > PACKAGE2_SIZE_MAX) {
printf("Error: rebuilt package2 is too big!\n");
generic_panic();
}
rebuilt_package2 = (package2_header_t *)malloc(rebuilt_package2_size);
if (rebuilt_package2 == NULL) {
printf("Error: package2_rebuild: out of memory!\n");
generic_panic();
}
/* Rebuild package2. */
memcpy(rebuilt_package2, package2, sizeof(package2_header_t));
package2_append_section(PACKAGE2_SECTION_KERNEL, rebuilt_package2, kernel, kernel_size);
package2_append_section(PACKAGE2_SECTION_INI1, rebuilt_package2, rebuilt_ini1, rebuilt_ini1->size);
package2_append_section(PACKAGE2_SECTION_UNUSED, rebuilt_package2, thermosphere, thermosphere_size);
/* Fix all necessary data in the header to accomodate for the new patches. */
package2_fixup_header_and_section_hashes();
package2_fixup_header_and_section_hashes(rebuilt_package2, rebuilt_package2_size);
/* Relocate Package2. */
memcpy(NX_BOOTLOADER_PACKAGE2_LOAD_ADDRESS, g_patched_package2, PACKAGE2_SIZE_MAX);
memcpy(NX_BOOTLOADER_PACKAGE2_LOAD_ADDRESS, rebuilt_package2, PACKAGE2_SIZE_MAX);
/* We're done. */
free(rebuilt_ini1);
free(rebuilt_package2);
}
static void package2_crypt_ctr(unsigned int master_key_rev, void *dst, size_t dst_size, const void *src, size_t src_size, const void *ctr, size_t ctr_size) {
/* Derive package2 key. */
const uint8_t package2_key_source[0x10] = {0xFB, 0x8B, 0x6A, 0x9C, 0x79, 0x00, 0xC8, 0x49, 0xEF, 0xD2, 0x4D, 0x85, 0x4D, 0x30, 0xA0, 0xC7};
@ -67,7 +87,7 @@ static void package2_crypt_ctr(unsigned int master_key_rev, void *dst, size_t ds
se_aes_ctr_crypt(KEYSLOT_SWITCH_PACKAGE2KEY, dst, dst_size, src, src_size, ctr, ctr_size);
}
bool validate_package2_metadata(package2_meta_t *metadata) {
static bool package2_validate_metadata(package2_meta_t *metadata) {
if (metadata->magic != MAGIC_PK21) {
return false;
}
@ -153,7 +173,7 @@ bool validate_package2_metadata(package2_meta_t *metadata) {
return false;
}
uint32_t decrypt_and_validate_header(package2_header_t *header, bool is_plaintext) {
static uint32_t package2_decrypt_and_validate_header(package2_header_t *header, bool is_plaintext) {
package2_meta_t metadata;
/* TODO: Also accept plaintext package2 based on bootconfig. */
@ -167,7 +187,7 @@ uint32_t decrypt_and_validate_header(package2_header_t *header, bool is_plaintex
/* Copy the ctr (which stores information) into the decrypted metadata. */
memcpy(metadata.ctr, header->metadata.ctr, sizeof(header->metadata.ctr));
/* See if this is the correct key. */
if (validate_package2_metadata(&metadata)) {
if (package2_validate_metadata(&metadata)) {
header->metadata = metadata;
return mkey_rev;
}
@ -177,102 +197,96 @@ uint32_t decrypt_and_validate_header(package2_header_t *header, bool is_plaintex
if (mkey_rev > mkey_get_revision()) {
panic(0xFAF00003);
}
} else if (!validate_package2_metadata(&header->metadata)) {
} else if (!package2_validate_metadata(&header->metadata)) {
panic(0xFAF0003);
}
return 0;
}
void package2_decrypt(void *package2_address) {
/* TODO: Actually decrypt, and copy sections into the relevant g_package2_sections[n] */
memcpy(g_patched_package2, NX_BOOTLOADER_PACKAGE2_LOAD_ADDRESS, PACKAGE2_SIZE_MAX);
static void package2_decrypt(package2_header_t *package2) {
bool is_package2_plaintext = package2->signature[0];
is_package2_plaintext &= memcmp(package2->signature, package2->signature + 1, sizeof(package2->signature) - 1) == 0;
is_package2_plaintext &= package2->metadata.magic == MAGIC_PK21;
bool is_package2_plaintext = g_patched_package2_header->signature[0];
is_package2_plaintext &= memcmp(g_patched_package2_header->signature, g_patched_package2_header->signature + 1, sizeof(g_patched_package2_header->signature) - 1) == 0;
is_package2_plaintext &= g_patched_package2_header->metadata.magic == MAGIC_PK21;
uint32_t pk21_mkey_revision = decrypt_and_validate_header(g_patched_package2_header, is_package2_plaintext);
uint32_t pk21_mkey_revision = package2_decrypt_and_validate_header(package2, is_package2_plaintext);
size_t cur_section_offset = 0;
/* Copy each section to its appropriate location, decrypting if necessary. */
for (unsigned int section = 0; section < PACKAGE2_SECTION_MAX; section++) {
if (g_patched_package2_header->metadata.section_sizes[section] == 0) {
if (package2->metadata.section_sizes[section] == 0) {
continue;
}
void *src_start = g_patched_package2 + sizeof(package2_header_t) + cur_section_offset;
void *dst_start = g_package2_sections[section];
size_t size = (size_t)g_patched_package2_header->metadata.section_sizes[section];
void *src_start = (uint8_t *)package2 + sizeof(package2_header_t) + cur_section_offset;
void *dst_start = src_start;
size_t size = (size_t)package2->metadata.section_sizes[section];
if (is_package2_plaintext&& size != 0) {
memcpy(dst_start, src_start, size);
} else if (size != 0) {
package2_crypt_ctr(pk21_mkey_revision, dst_start, size, src_start, size, g_patched_package2_header->metadata.section_ctrs[section], 0x10);
package2_crypt_ctr(pk21_mkey_revision, dst_start, size, src_start, size, package2->metadata.section_ctrs[section], 0x10);
}
cur_section_offset += size;
}
/* Clear the signature, to signal that this is a plaintext, unsigned package2. */
memset(g_patched_package2_header->signature, 0, sizeof(g_patched_package2_header->signature));
memset(package2->signature, 0, sizeof(package2->signature));
}
void package2_add_thermosphere_section(void) {
if (g_patched_package2_header->metadata.section_sizes[PACKAGE2_SECTION_UNUSED] != 0) {
printf(u8"Error: Package2 has no unused section for Thermosphère!\n");
generic_panic();
}
/* TODO: Copy thermosphere to g_package2_sections[PACKAGE2_SECTION_UNUSED], update header size. */
static size_t package2_get_thermosphere(void **thermosphere) {
(*thermosphere) = NULL;
return 0;
}
void package2_patch_kernel(void) {
static void package2_patch_kernel(void *kernel, size_t size) {
(void)kernel;
(void)size;
/* TODO: What kind of patching do we want to try to do here? */
}
void package2_patch_ini1(void) {
static ini1_header_t *package2_rebuild_ini1(ini1_header_t *ini1) {
/* TODO: Do we want to support loading another INI from sd:/whatever/INI1.bin? */
ini1_header_t *inis_to_merge[STRATOSPHERE_INI1_MAX] = {0};
ini1_header_t *merged;
inis_to_merge[STRATOSPHERE_INI1_EMBEDDED] = stratosphere_get_ini1();
inis_to_merge[STRATOSPHERE_INI1_PACKAGE2] = (ini1_header_t *)g_package2_sections[PACKAGE2_SECTION_INI1];
inis_to_merge[STRATOSPHERE_INI1_PACKAGE2] = ini1;
/* Merge all of the INI1s. */
merged = stratosphere_merge_inis(inis_to_merge, STRATOSPHERE_INI1_MAX);
memcpy(g_package2_sections[PACKAGE2_SECTION_INI1], merged, merged->size);
g_patched_package2_header->metadata.section_sizes[PACKAGE2_SECTION_INI1] = merged->size;
/* Free temporary buffers. */
free(merged);
/* Free temporary buffer. */
stratosphere_free_ini1();
return merged;
}
void package2_fixup_header_and_section_hashes(void) {
size_t cur_section_offset = 0;
static void package2_append_section(size_t id, package2_header_t *package2, void *data, size_t size) {
/* This function must be called in ascending order of id */
uint32_t offset = id == 0 ? 0 : package2->metadata.section_offsets[id - 1] + package2->metadata.section_sizes[id - 1];
void *dst = (uint8_t *)package2 + sizeof(package2_header_t) + offset;
memcpy(dst, data, size);
package2->metadata.section_offsets[id] = offset;
package2->metadata.section_sizes[id] = ((size + 3) << 2) >> 2;
}
static void package2_fixup_header_and_section_hashes(package2_header_t *package2, size_t size) {
/* Copy each section to its appropriate location. */
for (unsigned int section = 0; section < PACKAGE2_SECTION_MAX; section++) {
if (g_patched_package2_header->metadata.section_sizes[section] == 0) {
if (package2->metadata.section_sizes[section] == 0) {
continue;
}
size_t size = (size_t)g_patched_package2_header->metadata.section_sizes[section];
if (sizeof(package2_header_t) + cur_section_offset + size > PACKAGE2_SIZE_MAX) {
printf("Error: Patched Package2 is too big!\n");
generic_panic();
}
size_t sz = (size_t)package2->metadata.section_sizes[section];
size_t off = sizeof(package2_header_t) + package2->metadata.section_offsets[section];
/* Copy the section into the new package2. */
memcpy(g_patched_package2 + sizeof(package2_header_t) + cur_section_offset, g_package2_sections[section], size);
/* Fix up the hash. */
se_calculate_sha256(g_patched_package2_header->metadata.section_hashes[section], g_package2_sections[section], size);
cur_section_offset += size;
se_calculate_sha256(package2->metadata.section_hashes[section],(uint8_t *)package2 + off, sz);
}
/* Fix up the size in XOR'd CTR. */
uint32_t package_size = g_patched_package2_header->metadata.ctr_dwords[0] ^ g_patched_package2_header->metadata.ctr_dwords[2] ^ g_patched_package2_header->metadata.ctr_dwords[3];
uint32_t new_package_size = sizeof(package2_header_t) + cur_section_offset;
g_patched_package2_header->metadata.ctr_dwords[3] ^= (package_size ^ new_package_size);
uint32_t package_size = package2->metadata.ctr_dwords[0] ^ package2->metadata.ctr_dwords[2] ^ package2->metadata.ctr_dwords[3];
package2->metadata.ctr_dwords[3] ^= (package_size ^ size);
}

4
fusee/fusee-secondary/src/package2.h
View file

@ -53,6 +53,6 @@ typedef struct {
};
} package2_header_t;
void package2_patch(void *package2_address);
void package2_rebuild_and_copy(void *package2_address);
#endif
#endif