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1 | /* |
2 | * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
10 | #include <openssl/core_dispatch.h> | |
11 | #include <openssl/types.h> | |
12 | #include <openssl/safestack.h> | |
13 | #include <openssl/encoder.h> | |
14 | #include <openssl/decoder.h> | |
15 | #include "internal/cryptlib.h" | |
16 | #include "internal/refcount.h" | |
17 | ||
18 | struct ossl_serdes_base_st { | |
19 | OSSL_PROVIDER *prov; | |
20 | int id; | |
21 | const char *propdef; | |
22 | ||
23 | CRYPTO_REF_COUNT refcnt; | |
24 | CRYPTO_RWLOCK *lock; | |
25 | }; | |
26 | ||
27 | struct ossl_encoder_st { | |
28 | struct ossl_serdes_base_st base; | |
29 | OSSL_FUNC_encoder_newctx_fn *newctx; | |
30 | OSSL_FUNC_encoder_freectx_fn *freectx; | |
31 | OSSL_FUNC_encoder_set_ctx_params_fn *set_ctx_params; | |
32 | OSSL_FUNC_encoder_settable_ctx_params_fn *settable_ctx_params; | |
33 | OSSL_FUNC_encoder_encode_data_fn *encode_data; | |
34 | OSSL_FUNC_encoder_encode_object_fn *encode_object; | |
35 | }; | |
36 | ||
37 | struct ossl_decoder_st { | |
38 | struct ossl_serdes_base_st base; | |
39 | OSSL_FUNC_decoder_newctx_fn *newctx; | |
40 | OSSL_FUNC_decoder_freectx_fn *freectx; | |
41 | OSSL_FUNC_decoder_get_params_fn *get_params; | |
42 | OSSL_FUNC_decoder_gettable_params_fn *gettable_params; | |
43 | OSSL_FUNC_decoder_set_ctx_params_fn *set_ctx_params; | |
44 | OSSL_FUNC_decoder_settable_ctx_params_fn *settable_ctx_params; | |
45 | OSSL_FUNC_decoder_decode_fn *decode; | |
46 | OSSL_FUNC_decoder_export_object_fn *export_object; | |
47 | }; | |
48 | ||
49 | struct ossl_encoder_ctx_st { | |
50 | OSSL_ENCODER *encoder; | |
51 | void *serctx; | |
52 | ||
53 | int selection; | |
54 | ||
55 | /*- | |
56 | * Output / encoding data, used by OSSL_ENCODER_to_{bio,fp} | |
57 | * | |
58 | * |object| is the libcrypto object to handle. | |
59 | * |do_output| performs the actual encoding. | |
60 | * | |
61 | * |do_output| must have intimate knowledge of |object|. | |
62 | */ | |
63 | const void *object; | |
64 | int (*do_output)(OSSL_ENCODER_CTX *ctx, BIO *out); | |
65 | ||
66 | /* For any function that needs a passphrase reader */ | |
67 | const UI_METHOD *ui_method; | |
68 | void *ui_data; | |
69 | /* | |
70 | * if caller used OSSL_ENCODER_CTX_set_passphrase_cb(), we need | |
71 | * intermediary storage. | |
72 | */ | |
73 | UI_METHOD *allocated_ui_method; | |
74 | }; | |
75 | ||
76 | struct ossl_decoder_instance_st { | |
77 | OSSL_DECODER *decoder; /* Never NULL */ | |
78 | void *deserctx; /* Never NULL */ | |
79 | const char *input_type; /* Never NULL */ | |
80 | }; | |
81 | ||
82 | DEFINE_STACK_OF(OSSL_DECODER_INSTANCE) | |
83 | ||
84 | struct ossl_decoder_ctx_st { | |
85 | /* | |
86 | * The caller may know the input type of the data they pass. If not, | |
87 | * this will remain NULL and the decoding functionality will start | |
88 | * with trying to decode with any desencoder in |decoder_insts|, | |
89 | * regardless of their respective input type. | |
90 | */ | |
91 | const char *start_input_type; | |
92 | ||
93 | /* | |
94 | * Decoders that are components of any current decoding path. | |
95 | */ | |
96 | STACK_OF(OSSL_DECODER_INSTANCE) *decoder_insts; | |
97 | ||
98 | /* | |
99 | * The constructors of a decoding, and its caller argument. | |
100 | */ | |
101 | OSSL_DECODER_CONSTRUCT *construct; | |
102 | OSSL_DECODER_CLEANUP *cleanup; | |
103 | void *construct_data; | |
104 | ||
105 | /* For any function that needs a passphrase reader */ | |
106 | OSSL_PASSPHRASE_CALLBACK *passphrase_cb; | |
107 | const UI_METHOD *ui_method; | |
108 | void *ui_data; | |
109 | /* | |
110 | * if caller used OSSL_ENCODER_CTX_set_pem_password_cb(), we need | |
111 | * intermediary storage. | |
112 | */ | |
113 | UI_METHOD *allocated_ui_method; | |
114 | /* | |
115 | * Because the same input may pass through more than one decoder, | |
116 | * we cache any passphrase passed to us. The desrializing processor | |
117 | * must clear this at the end of a run. | |
118 | */ | |
119 | unsigned char *cached_passphrase; | |
120 | size_t cached_passphrase_len; | |
121 | ||
122 | /* | |
123 | * Flag section. Keep these together | |
124 | */ | |
125 | ||
126 | /* | |
127 | * The passphrase was passed to us by the user. In that case, it | |
128 | * should only be freed when freeing this context. | |
129 | */ | |
130 | unsigned int flag_user_passphrase:1; | |
131 | }; | |
132 | ||
133 | /* Passphrase callbacks, found in serdes_pass.c */ | |
134 | ||
135 | /* | |
136 | * Encoders typically want to get an outgoing passphrase, while | |
137 | * decoders typically want to get en incoming passphrase. | |
138 | */ | |
139 | OSSL_PASSPHRASE_CALLBACK ossl_encoder_passphrase_out_cb; | |
140 | OSSL_PASSPHRASE_CALLBACK ossl_decoder_passphrase_in_cb; |