[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <errno.h>
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| 12 | #include "bio_lcl.h"
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| 13 | #include "internal/cryptlib.h"
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| 14 |
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| 15 | static int mem_write(BIO *h, const char *buf, int num);
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| 16 | static int mem_read(BIO *h, char *buf, int size);
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| 17 | static int mem_puts(BIO *h, const char *str);
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| 18 | static int mem_gets(BIO *h, char *str, int size);
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| 19 | static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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| 20 | static int mem_new(BIO *h);
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| 21 | static int secmem_new(BIO *h);
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| 22 | static int mem_free(BIO *data);
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| 23 | static int mem_buf_free(BIO *data, int free_all);
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| 24 | static int mem_buf_sync(BIO *h);
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| 25 |
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| 26 | static const BIO_METHOD mem_method = {
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| 27 | BIO_TYPE_MEM,
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| 28 | "memory buffer",
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| 29 | mem_write,
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| 30 | mem_read,
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| 31 | mem_puts,
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| 32 | mem_gets,
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| 33 | mem_ctrl,
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| 34 | mem_new,
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| 35 | mem_free,
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| 36 | NULL,
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| 37 | };
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| 38 |
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| 39 | static const BIO_METHOD secmem_method = {
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| 40 | BIO_TYPE_MEM,
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| 41 | "secure memory buffer",
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| 42 | mem_write,
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| 43 | mem_read,
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| 44 | mem_puts,
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| 45 | mem_gets,
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| 46 | mem_ctrl,
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| 47 | secmem_new,
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| 48 | mem_free,
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| 49 | NULL,
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| 50 | };
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| 51 |
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| 52 | /* BIO memory stores buffer and read pointer */
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| 53 | typedef struct bio_buf_mem_st {
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| 54 | struct buf_mem_st *buf; /* allocated buffer */
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| 55 | struct buf_mem_st *readp; /* read pointer */
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| 56 | } BIO_BUF_MEM;
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| 57 |
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| 58 | /*
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| 59 | * bio->num is used to hold the value to return on 'empty', if it is 0,
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| 60 | * should_retry is not set
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| 61 | */
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| 62 |
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| 63 | const BIO_METHOD *BIO_s_mem(void)
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| 64 | {
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| 65 | return (&mem_method);
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| 66 | }
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| 67 |
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| 68 | const BIO_METHOD *BIO_s_secmem(void)
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| 69 | {
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| 70 | return(&secmem_method);
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| 71 | }
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| 72 |
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| 73 | BIO *BIO_new_mem_buf(const void *buf, int len)
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| 74 | {
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| 75 | BIO *ret;
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| 76 | BUF_MEM *b;
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| 77 | BIO_BUF_MEM *bb;
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| 78 | size_t sz;
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| 79 |
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| 80 | if (buf == NULL) {
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| 81 | BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER);
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| 82 | return NULL;
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| 83 | }
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| 84 | sz = (len < 0) ? strlen(buf) : (size_t)len;
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| 85 | if ((ret = BIO_new(BIO_s_mem())) == NULL)
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| 86 | return NULL;
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| 87 | bb = (BIO_BUF_MEM *)ret->ptr;
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| 88 | b = bb->buf;
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| 89 | /* Cast away const and trust in the MEM_RDONLY flag. */
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| 90 | b->data = (void *)buf;
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| 91 | b->length = sz;
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| 92 | b->max = sz;
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| 93 | *bb->readp = *bb->buf;
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| 94 | ret->flags |= BIO_FLAGS_MEM_RDONLY;
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| 95 | /* Since this is static data retrying won't help */
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| 96 | ret->num = 0;
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| 97 | return ret;
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| 98 | }
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| 99 |
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| 100 | static int mem_init(BIO *bi, unsigned long flags)
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| 101 | {
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| 102 | BIO_BUF_MEM *bb = OPENSSL_zalloc(sizeof(*bb));
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| 103 |
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| 104 | if (bb == NULL)
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| 105 | return 0;
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| 106 | if ((bb->buf = BUF_MEM_new_ex(flags)) == NULL) {
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| 107 | OPENSSL_free(bb);
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| 108 | return 0;
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| 109 | }
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| 110 | if ((bb->readp = OPENSSL_zalloc(sizeof(*bb->readp))) == NULL) {
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| 111 | BUF_MEM_free(bb->buf);
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| 112 | OPENSSL_free(bb);
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| 113 | return 0;
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| 114 | }
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| 115 | *bb->readp = *bb->buf;
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| 116 | bi->shutdown = 1;
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| 117 | bi->init = 1;
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| 118 | bi->num = -1;
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| 119 | bi->ptr = (char *)bb;
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| 120 | return 1;
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| 121 | }
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| 122 |
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| 123 | static int mem_new(BIO *bi)
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| 124 | {
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| 125 | return (mem_init(bi, 0L));
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| 126 | }
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| 127 |
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| 128 | static int secmem_new(BIO *bi)
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| 129 | {
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| 130 | return (mem_init(bi, BUF_MEM_FLAG_SECURE));
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| 131 | }
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| 132 |
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| 133 | static int mem_free(BIO *a)
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| 134 | {
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| 135 | return (mem_buf_free(a, 1));
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| 136 | }
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| 137 |
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| 138 | static int mem_buf_free(BIO *a, int free_all)
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| 139 | {
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| 140 | if (a == NULL)
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| 141 | return (0);
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| 142 | if (a->shutdown) {
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| 143 | if ((a->init) && (a->ptr != NULL)) {
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| 144 | BUF_MEM *b;
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| 145 | BIO_BUF_MEM *bb = (BIO_BUF_MEM *)a->ptr;
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| 146 |
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| 147 | if (bb != NULL) {
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| 148 | b = bb->buf;
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| 149 | if (a->flags & BIO_FLAGS_MEM_RDONLY)
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| 150 | b->data = NULL;
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| 151 | BUF_MEM_free(b);
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| 152 | if (free_all) {
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| 153 | OPENSSL_free(bb->readp);
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| 154 | OPENSSL_free(bb);
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| 155 | }
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| 156 | }
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| 157 | a->ptr = NULL;
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| 158 | }
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| 159 | }
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| 160 | return (1);
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| 161 | }
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| 162 |
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| 163 | /*
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| 164 | * Reallocate memory buffer if read pointer differs
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| 165 | */
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| 166 | static int mem_buf_sync(BIO *b)
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| 167 | {
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| 168 | if (b != NULL && b->init != 0 && b->ptr != NULL) {
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| 169 | BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
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| 170 |
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| 171 | if (bbm->readp->data != bbm->buf->data) {
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| 172 | memmove(bbm->buf->data, bbm->readp->data, bbm->readp->length);
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| 173 | bbm->buf->length = bbm->readp->length;
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| 174 | bbm->readp->data = bbm->buf->data;
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| 175 | }
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| 176 | }
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| 177 | return (0);
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| 178 | }
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| 179 |
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| 180 | static int mem_read(BIO *b, char *out, int outl)
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| 181 | {
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| 182 | int ret = -1;
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| 183 | BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
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| 184 | BUF_MEM *bm = bbm->readp;
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| 185 |
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| 186 | BIO_clear_retry_flags(b);
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| 187 | ret = (outl >= 0 && (size_t)outl > bm->length) ? (int)bm->length : outl;
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| 188 | if ((out != NULL) && (ret > 0)) {
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| 189 | memcpy(out, bm->data, ret);
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| 190 | bm->length -= ret;
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| 191 | bm->data += ret;
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| 192 | } else if (bm->length == 0) {
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| 193 | ret = b->num;
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| 194 | if (ret != 0)
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| 195 | BIO_set_retry_read(b);
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| 196 | }
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| 197 | return (ret);
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| 198 | }
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| 199 |
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| 200 | static int mem_write(BIO *b, const char *in, int inl)
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| 201 | {
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| 202 | int ret = -1;
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| 203 | int blen;
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| 204 | BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
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| 205 |
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| 206 | if (in == NULL) {
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| 207 | BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER);
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| 208 | goto end;
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| 209 | }
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| 210 | if (b->flags & BIO_FLAGS_MEM_RDONLY) {
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| 211 | BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO);
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| 212 | goto end;
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| 213 | }
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| 214 | BIO_clear_retry_flags(b);
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| 215 | blen = bbm->readp->length;
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| 216 | mem_buf_sync(b);
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| 217 | if (BUF_MEM_grow_clean(bbm->buf, blen + inl) == 0)
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| 218 | goto end;
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| 219 | memcpy(bbm->buf->data + blen, in, inl);
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| 220 | *bbm->readp = *bbm->buf;
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| 221 | ret = inl;
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| 222 | end:
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| 223 | return (ret);
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| 224 | }
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| 225 |
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| 226 | static long mem_ctrl(BIO *b, int cmd, long num, void *ptr)
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| 227 | {
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| 228 | long ret = 1;
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| 229 | char **pptr;
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| 230 | BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
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| 231 | BUF_MEM *bm;
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| 232 |
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| 233 | switch (cmd) {
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| 234 | case BIO_CTRL_RESET:
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| 235 | bm = bbm->buf;
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| 236 | if (bm->data != NULL) {
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| 237 | /* For read only case reset to the start again */
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| 238 | if ((b->flags & BIO_FLAGS_MEM_RDONLY) || (b->flags & BIO_FLAGS_NONCLEAR_RST)) {
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| 239 | bm->length = bm->max;
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| 240 | } else {
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| 241 | memset(bm->data, 0, bm->max);
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| 242 | bm->length = 0;
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| 243 | }
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| 244 | *bbm->readp = *bbm->buf;
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| 245 | }
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| 246 | break;
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| 247 | case BIO_CTRL_EOF:
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| 248 | bm = bbm->readp;
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| 249 | ret = (long)(bm->length == 0);
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| 250 | break;
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| 251 | case BIO_C_SET_BUF_MEM_EOF_RETURN:
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| 252 | b->num = (int)num;
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| 253 | break;
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| 254 | case BIO_CTRL_INFO:
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| 255 | bm = bbm->readp;
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| 256 | ret = (long)bm->length;
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| 257 | if (ptr != NULL) {
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| 258 | pptr = (char **)ptr;
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| 259 | *pptr = (char *)&(bm->data[0]);
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| 260 | }
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| 261 | break;
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| 262 | case BIO_C_SET_BUF_MEM:
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| 263 | mem_buf_free(b, 0);
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| 264 | b->shutdown = (int)num;
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| 265 | bbm->buf = ptr;
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| 266 | *bbm->readp = *bbm->buf;
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| 267 | b->ptr = bbm;
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| 268 | break;
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| 269 | case BIO_C_GET_BUF_MEM_PTR:
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| 270 | if (ptr != NULL) {
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| 271 | mem_buf_sync(b);
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| 272 | bm = bbm->readp;
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| 273 | pptr = (char **)ptr;
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| 274 | *pptr = (char *)bm;
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| 275 | }
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| 276 | break;
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| 277 | case BIO_CTRL_GET_CLOSE:
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| 278 | ret = (long)b->shutdown;
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| 279 | break;
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| 280 | case BIO_CTRL_SET_CLOSE:
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| 281 | b->shutdown = (int)num;
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| 282 | break;
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| 283 | case BIO_CTRL_WPENDING:
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| 284 | ret = 0L;
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| 285 | break;
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| 286 | case BIO_CTRL_PENDING:
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| 287 | bm = bbm->readp;
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| 288 | ret = (long)bm->length;
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| 289 | break;
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| 290 | case BIO_CTRL_DUP:
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| 291 | case BIO_CTRL_FLUSH:
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| 292 | ret = 1;
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| 293 | break;
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| 294 | case BIO_CTRL_PUSH:
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| 295 | case BIO_CTRL_POP:
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| 296 | default:
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| 297 | ret = 0;
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| 298 | break;
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| 299 | }
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| 300 | return (ret);
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| 301 | }
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| 302 |
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| 303 | static int mem_gets(BIO *bp, char *buf, int size)
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| 304 | {
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| 305 | int i, j;
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| 306 | int ret = -1;
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| 307 | char *p;
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| 308 | BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)bp->ptr;
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| 309 | BUF_MEM *bm = bbm->readp;
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| 310 |
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| 311 | BIO_clear_retry_flags(bp);
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| 312 | j = bm->length;
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| 313 | if ((size - 1) < j)
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| 314 | j = size - 1;
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| 315 | if (j <= 0) {
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| 316 | *buf = '\0';
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| 317 | return 0;
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| 318 | }
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| 319 | p = bm->data;
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| 320 | for (i = 0; i < j; i++) {
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| 321 | if (p[i] == '\n') {
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| 322 | i++;
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| 323 | break;
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| 324 | }
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| 325 | }
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| 326 |
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| 327 | /*
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| 328 | * i is now the max num of bytes to copy, either j or up to
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| 329 | * and including the first newline
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| 330 | */
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| 331 |
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| 332 | i = mem_read(bp, buf, i);
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| 333 | if (i > 0)
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| 334 | buf[i] = '\0';
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| 335 | ret = i;
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| 336 | return (ret);
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| 337 | }
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| 338 |
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| 339 | static int mem_puts(BIO *bp, const char *str)
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| 340 | {
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| 341 | int n, ret;
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| 342 |
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| 343 | n = strlen(str);
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| 344 | ret = mem_write(bp, str, n);
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| 345 | /* memory semantics is that it will always work */
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| 346 | return (ret);
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| 347 | }
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