| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * Copyright (C) 2020-2024 Microsoft Corporation. All rights reserved. |
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| 4 | */ |
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| 5 | #include <uapi/linux/lsm.h> |
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| 6 | |
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| 7 | #include "ipe.h" |
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| 8 | #include "eval.h" |
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| 9 | #include "hooks.h" |
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| 10 | |
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| 11 | extern const char *const ipe_boot_policy; |
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| 12 | bool ipe_enabled; |
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| 13 | |
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| 14 | static struct lsm_blob_sizes ipe_blobs __ro_after_init = { |
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| 15 | .lbs_superblock = sizeof(struct ipe_superblock), |
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| 16 | #ifdef CONFIG_IPE_PROP_DM_VERITY |
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| 17 | .lbs_bdev = sizeof(struct ipe_bdev), |
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| 18 | #endif /* CONFIG_IPE_PROP_DM_VERITY */ |
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| 19 | #ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG |
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| 20 | .lbs_inode = sizeof(struct ipe_inode), |
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| 21 | #endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */ |
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| 22 | }; |
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| 23 | |
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| 24 | static const struct lsm_id ipe_lsmid = { |
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| 25 | .name = "ipe" , |
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| 26 | .id = LSM_ID_IPE, |
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| 27 | }; |
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| 28 | |
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| 29 | struct ipe_superblock *ipe_sb(const struct super_block *sb) |
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| 30 | { |
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| 31 | return sb->s_security + ipe_blobs.lbs_superblock; |
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| 32 | } |
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| 33 | |
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| 34 | #ifdef CONFIG_IPE_PROP_DM_VERITY |
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| 35 | struct ipe_bdev *ipe_bdev(struct block_device *b) |
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| 36 | { |
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| 37 | return b->bd_security + ipe_blobs.lbs_bdev; |
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| 38 | } |
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| 39 | #endif /* CONFIG_IPE_PROP_DM_VERITY */ |
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| 40 | |
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| 41 | #ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG |
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| 42 | struct ipe_inode *ipe_inode(const struct inode *inode) |
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| 43 | { |
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| 44 | return inode->i_security + ipe_blobs.lbs_inode; |
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| 45 | } |
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| 46 | #endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */ |
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| 47 | |
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| 48 | static struct security_hook_list ipe_hooks[] __ro_after_init = { |
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| 49 | LSM_HOOK_INIT(bprm_check_security, ipe_bprm_check_security), |
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| 50 | LSM_HOOK_INIT(mmap_file, ipe_mmap_file), |
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| 51 | LSM_HOOK_INIT(file_mprotect, ipe_file_mprotect), |
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| 52 | LSM_HOOK_INIT(kernel_read_file, ipe_kernel_read_file), |
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| 53 | LSM_HOOK_INIT(kernel_load_data, ipe_kernel_load_data), |
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| 54 | LSM_HOOK_INIT(initramfs_populated, ipe_unpack_initramfs), |
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| 55 | #ifdef CONFIG_IPE_PROP_DM_VERITY |
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| 56 | LSM_HOOK_INIT(bdev_free_security, ipe_bdev_free_security), |
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| 57 | LSM_HOOK_INIT(bdev_setintegrity, ipe_bdev_setintegrity), |
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| 58 | #endif /* CONFIG_IPE_PROP_DM_VERITY */ |
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| 59 | #ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG |
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| 60 | LSM_HOOK_INIT(inode_setintegrity, ipe_inode_setintegrity), |
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| 61 | #endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */ |
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| 62 | }; |
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| 63 | |
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| 64 | /** |
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| 65 | * ipe_init() - Entry point of IPE. |
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| 66 | * |
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| 67 | * This is called at LSM init, which happens occurs early during kernel |
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| 68 | * start up. During this phase, IPE registers its hooks and loads the |
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| 69 | * builtin boot policy. |
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| 70 | * |
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| 71 | * Return: |
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| 72 | * * %0 - OK |
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| 73 | * * %-ENOMEM - Out of memory (OOM) |
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| 74 | */ |
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| 75 | static int __init ipe_init(void) |
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| 76 | { |
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| 77 | struct ipe_policy *p = NULL; |
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| 78 | |
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| 79 | security_add_hooks(hooks: ipe_hooks, ARRAY_SIZE(ipe_hooks), lsmid: &ipe_lsmid); |
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| 80 | ipe_enabled = true; |
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| 81 | |
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| 82 | if (ipe_boot_policy) { |
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| 83 | p = ipe_new_policy(text: ipe_boot_policy, strlen(ipe_boot_policy), |
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| 84 | NULL, pkcs7len: 0); |
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| 85 | if (IS_ERR(ptr: p)) |
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| 86 | return PTR_ERR(ptr: p); |
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| 87 | |
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| 88 | rcu_assign_pointer(ipe_active_policy, p); |
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| 89 | } |
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| 90 | |
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| 91 | return 0; |
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| 92 | } |
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| 93 | |
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| 94 | DEFINE_LSM(ipe) = { |
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| 95 | .name = "ipe" , |
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| 96 | .init = ipe_init, |
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| 97 | .blobs = &ipe_blobs, |
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| 98 | }; |
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| 99 | |
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