1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2020-2024 Microsoft Corporation. All rights reserved.
24 #define INO_BLOCK_DEV(ino) ((ino)->i_sb->s_bdev)
26 #define FILE_SUPERBLOCK(f) ((f)->f_path.mnt->mnt_sb)
29  * build_ipe_sb_ctx() - Build initramfs field of an ipe evaluation context.
35 	ctx->initramfs = ipe_sb(FILE_SUPERBLOCK(file))->initramfs;  in build_ipe_sb_ctx()
40  * build_ipe_bdev_ctx() - Build ipe_bdev field of an evaluation context.
47 		ctx->ipe_bdev = ipe_bdev(INO_BLOCK_DEV(ino));  in build_ipe_bdev_ctx()
60 	ctx->ipe_inode = ipe_inode(ctx->ino);  in build_ipe_inode_blob_ctx()
70  * build_ipe_inode_ctx() - Build inode fields of an evaluation context.
76 	ctx->ino = ino;  in build_ipe_inode_ctx()
86  * ipe_build_eval_ctx() - Build an ipe evaluation context.
99 	ctx->file = file;  in ipe_build_eval_ctx()
100 	ctx->op = op;  in ipe_build_eval_ctx()
101 	ctx->hook = hook;  in ipe_build_eval_ctx()
105 		ino = d_real_inode(file->f_path.dentry);  in ipe_build_eval_ctx()
112  * evaluate_boot_verified() - Evaluate @ctx for the boot verified property.
116  * * %true	- The current @ctx match the @p
117  * * %false	- The current @ctx doesn't match the @p
121 	return ctx->initramfs;  in evaluate_boot_verified()
126  * evaluate_dmv_roothash() - Evaluate @ctx against a dmv roothash property.
131  * * %true	- The current @ctx match the @p
132  * * %false	- The current @ctx doesn't match the @p
137 	return !!ctx->ipe_bdev &&  in evaluate_dmv_roothash()
138 	       !!ctx->ipe_bdev->root_hash &&  in evaluate_dmv_roothash()
139 	       ipe_digest_eval(p->value,  in evaluate_dmv_roothash()
140 			       ctx->ipe_bdev->root_hash);  in evaluate_dmv_roothash()
152  * evaluate_dmv_sig_false() - Evaluate @ctx against a dmv sig false property.
156  * * %true	- The current @ctx match the property
157  * * %false	- The current @ctx doesn't match the property
161 	return !ctx->ipe_bdev || (!ctx->ipe_bdev->dm_verity_signed);  in evaluate_dmv_sig_false()
165  * evaluate_dmv_sig_true() - Evaluate @ctx against a dmv sig true property.
169  * * %true	- The current @ctx match the property
170  * * %false	- The current @ctx doesn't match the property
190  * evaluate_fsv_digest() - Evaluate @ctx against a fsv digest property.
195  * * %true	- The current @ctx match the @p
196  * * %false	- The current @ctx doesn't match the @p
205 	if (!ctx->ino)  in evaluate_fsv_digest()
207 	if (!fsverity_get_digest((struct inode *)ctx->ino,  in evaluate_fsv_digest()
217 	return ipe_digest_eval(p->value, &info);  in evaluate_fsv_digest()
229  * evaluate_fsv_sig_false() - Evaluate @ctx against a fsv sig false property.
233  * * %true	- The current @ctx match the property
234  * * %false	- The current @ctx doesn't match the property
238 	return !ctx->ino ||  in evaluate_fsv_sig_false()
239 	       !IS_VERITY(ctx->ino) ||  in evaluate_fsv_sig_false()
240 	       !ctx->ipe_inode ||  in evaluate_fsv_sig_false()
241 	       !ctx->ipe_inode->fs_verity_signed;  in evaluate_fsv_sig_false()
245  * evaluate_fsv_sig_true() - Evaluate @ctx against a fsv sig true property.
249  * * %true - The current @ctx match the property
250  * * %false - The current @ctx doesn't match the property
269  * evaluate_property() - Analyze @ctx against a rule property.
277  * * %true	- The current @ctx match the @p
278  * * %false	- The current @ctx doesn't match the @p
283 	switch (p->type) {  in evaluate_property()
306  * ipe_evaluate_event() - Analyze @ctx against the current active policy.
312  * * %0		- Success
313  * * %-EACCES	- @ctx did not pass evaluation
317 	const struct ipe_op_table *rules = NULL;  in ipe_evaluate_event()  local
334 	if (ctx->op == IPE_OP_INVALID) {  in ipe_evaluate_event()
335 		if (pol->parsed->global_default_action == IPE_ACTION_INVALID) {  in ipe_evaluate_event()
339 			action = pol->parsed->global_default_action;  in ipe_evaluate_event()
345 	rules = &pol->parsed->rules[ctx->op];  in ipe_evaluate_event()
347 	list_for_each_entry(rule, &rules->rules, next) {  in ipe_evaluate_event()
350 		list_for_each_entry(prop, &rule->props, next) {  in ipe_evaluate_event()
361 		action = rule->action;  in ipe_evaluate_event()
363 	} else if (rules->default_action != IPE_ACTION_INVALID) {  in ipe_evaluate_event()
364 		action = rules->default_action;  in ipe_evaluate_event()
367 		action = pol->parsed->global_default_action;  in ipe_evaluate_event()
376 		rc = -EACCES;  in ipe_evaluate_event()