1 | /*
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2 | * Copyright 2008-2016 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 <ctype.h>
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12 | #include "internal/cryptlib.h"
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13 | #include <openssl/rand.h>
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14 | #include <openssl/x509.h>
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15 | #include <openssl/asn1.h>
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16 | #include <openssl/asn1t.h>
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17 | #include "internal/evp_int.h"
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18 | #include "internal/bio.h"
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19 | #include "asn1_locl.h"
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20 |
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21 | /*
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22 | * Generalised MIME like utilities for streaming ASN1. Although many have a
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23 | * PKCS7/CMS like flavour others are more general purpose.
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24 | */
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25 |
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26 | /*
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27 | * MIME format structures Note that all are translated to lower case apart
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28 | * from parameter values. Quotes are stripped off
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29 | */
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30 |
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31 | struct mime_param_st {
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32 | char *param_name; /* Param name e.g. "micalg" */
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33 | char *param_value; /* Param value e.g. "sha1" */
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34 | };
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35 |
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36 | struct mime_header_st {
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37 | char *name; /* Name of line e.g. "content-type" */
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38 | char *value; /* Value of line e.g. "text/plain" */
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39 | STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
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40 | };
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41 |
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42 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
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43 | const ASN1_ITEM *it);
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44 | static char *strip_ends(char *name);
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45 | static char *strip_start(char *name);
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46 | static char *strip_end(char *name);
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47 | static MIME_HEADER *mime_hdr_new(const char *name, const char *value);
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48 | static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value);
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49 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
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50 | static int mime_hdr_cmp(const MIME_HEADER *const *a,
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51 | const MIME_HEADER *const *b);
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52 | static int mime_param_cmp(const MIME_PARAM *const *a,
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53 | const MIME_PARAM *const *b);
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54 | static void mime_param_free(MIME_PARAM *param);
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55 | static int mime_bound_check(char *line, int linelen, const char *bound, int blen);
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56 | static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret);
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57 | static int strip_eol(char *linebuf, int *plen, int flags);
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58 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name);
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59 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name);
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60 | static void mime_hdr_free(MIME_HEADER *hdr);
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61 |
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62 | #define MAX_SMLEN 1024
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63 | #define mime_debug(x) /* x */
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64 |
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65 | /* Output an ASN1 structure in BER format streaming if necessary */
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66 |
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67 | int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
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68 | const ASN1_ITEM *it)
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69 | {
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70 | /* If streaming create stream BIO and copy all content through it */
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71 | if (flags & SMIME_STREAM) {
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72 | BIO *bio, *tbio;
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73 | bio = BIO_new_NDEF(out, val, it);
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74 | if (!bio) {
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75 | ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE);
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76 | return 0;
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77 | }
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78 | SMIME_crlf_copy(in, bio, flags);
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79 | (void)BIO_flush(bio);
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80 | /* Free up successive BIOs until we hit the old output BIO */
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81 | do {
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82 | tbio = BIO_pop(bio);
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83 | BIO_free(bio);
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84 | bio = tbio;
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85 | } while (bio != out);
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86 | }
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87 | /*
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88 | * else just write out ASN1 structure which will have all content stored
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89 | * internally
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90 | */
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91 | else
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92 | ASN1_item_i2d_bio(it, out, val);
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93 | return 1;
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94 | }
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95 |
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96 | /* Base 64 read and write of ASN1 structure */
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97 |
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98 | static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
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99 | const ASN1_ITEM *it)
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100 | {
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101 | BIO *b64;
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102 | int r;
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103 | b64 = BIO_new(BIO_f_base64());
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104 | if (b64 == NULL) {
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105 | ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE);
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106 | return 0;
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107 | }
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108 | /*
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109 | * prepend the b64 BIO so all data is base64 encoded.
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110 | */
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111 | out = BIO_push(b64, out);
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112 | r = i2d_ASN1_bio_stream(out, val, in, flags, it);
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113 | (void)BIO_flush(out);
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114 | BIO_pop(out);
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115 | BIO_free(b64);
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116 | return r;
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117 | }
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118 |
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119 | /* Streaming ASN1 PEM write */
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120 |
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121 | int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
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122 | const char *hdr, const ASN1_ITEM *it)
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123 | {
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124 | int r;
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125 | BIO_printf(out, "-----BEGIN %s-----\n", hdr);
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126 | r = B64_write_ASN1(out, val, in, flags, it);
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127 | BIO_printf(out, "-----END %s-----\n", hdr);
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128 | return r;
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129 | }
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130 |
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131 | static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
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132 | {
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133 | BIO *b64;
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134 | ASN1_VALUE *val;
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135 |
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136 | if ((b64 = BIO_new(BIO_f_base64())) == NULL) {
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137 | ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE);
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138 | return 0;
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139 | }
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140 | bio = BIO_push(b64, bio);
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141 | val = ASN1_item_d2i_bio(it, bio, NULL);
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142 | if (!val)
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143 | ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
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144 | (void)BIO_flush(bio);
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145 | BIO_pop(bio);
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146 | BIO_free(b64);
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147 | return val;
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148 | }
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149 |
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150 | /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
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151 |
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152 | static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
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153 | {
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154 | const EVP_MD *md;
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155 | int i, have_unknown = 0, write_comma, ret = 0, md_nid;
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156 | have_unknown = 0;
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157 | write_comma = 0;
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158 | for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
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159 | if (write_comma)
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160 | BIO_write(out, ",", 1);
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161 | write_comma = 1;
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162 | md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
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163 | md = EVP_get_digestbynid(md_nid);
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164 | if (md && md->md_ctrl) {
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165 | int rv;
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166 | char *micstr;
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167 | rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
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168 | if (rv > 0) {
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169 | BIO_puts(out, micstr);
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170 | OPENSSL_free(micstr);
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171 | continue;
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172 | }
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173 | if (rv != -2)
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174 | goto err;
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175 | }
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176 | switch (md_nid) {
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177 | case NID_sha1:
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178 | BIO_puts(out, "sha1");
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179 | break;
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180 |
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181 | case NID_md5:
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182 | BIO_puts(out, "md5");
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183 | break;
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184 |
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185 | case NID_sha256:
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186 | BIO_puts(out, "sha-256");
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187 | break;
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188 |
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189 | case NID_sha384:
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190 | BIO_puts(out, "sha-384");
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191 | break;
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192 |
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193 | case NID_sha512:
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194 | BIO_puts(out, "sha-512");
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195 | break;
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196 |
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197 | case NID_id_GostR3411_94:
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198 | BIO_puts(out, "gostr3411-94");
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199 | goto err;
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200 |
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201 | default:
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202 | if (have_unknown)
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203 | write_comma = 0;
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204 | else {
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205 | BIO_puts(out, "unknown");
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206 | have_unknown = 1;
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207 | }
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208 | break;
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209 |
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210 | }
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211 | }
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212 |
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213 | ret = 1;
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214 | err:
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215 |
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216 | return ret;
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217 |
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218 | }
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219 |
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220 | /* SMIME sender */
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221 |
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222 | int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
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223 | int ctype_nid, int econt_nid,
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224 | STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
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225 | {
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226 | char bound[33], c;
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227 | int i;
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228 | const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
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229 | const char *msg_type = NULL;
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230 | if (flags & SMIME_OLDMIME)
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231 | mime_prefix = "application/x-pkcs7-";
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232 | else
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233 | mime_prefix = "application/pkcs7-";
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234 |
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235 | if (flags & SMIME_CRLFEOL)
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236 | mime_eol = "\r\n";
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237 | else
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238 | mime_eol = "\n";
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239 | if ((flags & SMIME_DETACHED) && data) {
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240 | /* We want multipart/signed */
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241 | /* Generate a random boundary */
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242 | if (RAND_bytes((unsigned char *)bound, 32) <= 0)
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243 | return 0;
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244 | for (i = 0; i < 32; i++) {
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245 | c = bound[i] & 0xf;
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246 | if (c < 10)
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247 | c += '0';
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248 | else
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249 | c += 'A' - 10;
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250 | bound[i] = c;
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251 | }
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252 | bound[32] = 0;
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253 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
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254 | BIO_printf(bio, "Content-Type: multipart/signed;");
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255 | BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
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256 | BIO_puts(bio, " micalg=\"");
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257 | asn1_write_micalg(bio, mdalgs);
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258 | BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
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259 | bound, mime_eol, mime_eol);
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260 | BIO_printf(bio, "This is an S/MIME signed message%s%s",
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261 | mime_eol, mime_eol);
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262 | /* Now write out the first part */
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263 | BIO_printf(bio, "------%s%s", bound, mime_eol);
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264 | if (!asn1_output_data(bio, data, val, flags, it))
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265 | return 0;
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266 | BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
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267 |
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268 | /* Headers for signature */
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269 |
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270 | BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
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271 | BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
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272 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
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273 | BIO_printf(bio, "Content-Disposition: attachment;");
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274 | BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
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275 | B64_write_ASN1(bio, val, NULL, 0, it);
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276 | BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
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277 | mime_eol, mime_eol);
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278 | return 1;
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279 | }
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280 |
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281 | /* Determine smime-type header */
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282 |
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283 | if (ctype_nid == NID_pkcs7_enveloped)
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284 | msg_type = "enveloped-data";
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285 | else if (ctype_nid == NID_pkcs7_signed) {
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286 | if (econt_nid == NID_id_smime_ct_receipt)
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287 | msg_type = "signed-receipt";
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288 | else if (sk_X509_ALGOR_num(mdalgs) >= 0)
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289 | msg_type = "signed-data";
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290 | else
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291 | msg_type = "certs-only";
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292 | } else if (ctype_nid == NID_id_smime_ct_compressedData) {
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293 | msg_type = "compressed-data";
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294 | cname = "smime.p7z";
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295 | }
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296 | /* MIME headers */
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297 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
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298 | BIO_printf(bio, "Content-Disposition: attachment;");
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299 | BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
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300 | BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
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301 | if (msg_type)
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302 | BIO_printf(bio, " smime-type=%s;", msg_type);
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303 | BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
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304 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
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305 | mime_eol, mime_eol);
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306 | if (!B64_write_ASN1(bio, val, data, flags, it))
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307 | return 0;
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308 | BIO_printf(bio, "%s", mime_eol);
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309 | return 1;
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310 | }
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311 |
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312 | /* Handle output of ASN1 data */
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313 |
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314 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
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315 | const ASN1_ITEM *it)
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316 | {
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317 | BIO *tmpbio;
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318 | const ASN1_AUX *aux = it->funcs;
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319 | ASN1_STREAM_ARG sarg;
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320 | int rv = 1;
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321 |
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322 | /*
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323 | * If data is not detached or resigning then the output BIO is already
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324 | * set up to finalise when it is written through.
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325 | */
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326 | if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
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327 | SMIME_crlf_copy(data, out, flags);
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328 | return 1;
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329 | }
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330 |
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331 | if (!aux || !aux->asn1_cb) {
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332 | ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED);
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333 | return 0;
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334 | }
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335 |
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336 | sarg.out = out;
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337 | sarg.ndef_bio = NULL;
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338 | sarg.boundary = NULL;
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339 |
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340 | /* Let ASN1 code prepend any needed BIOs */
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341 |
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342 | if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
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343 | return 0;
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344 |
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345 | /* Copy data across, passing through filter BIOs for processing */
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346 | SMIME_crlf_copy(data, sarg.ndef_bio, flags);
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347 |
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348 | /* Finalize structure */
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349 | if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
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350 | rv = 0;
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351 |
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352 | /* Now remove any digests prepended to the BIO */
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353 |
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354 | while (sarg.ndef_bio != out) {
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355 | tmpbio = BIO_pop(sarg.ndef_bio);
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356 | BIO_free(sarg.ndef_bio);
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357 | sarg.ndef_bio = tmpbio;
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358 | }
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359 |
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360 | return rv;
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361 |
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362 | }
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363 |
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364 | /*
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365 | * SMIME reader: handle multipart/signed and opaque signing. in multipart
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366 | * case the content is placed in a memory BIO pointed to by "bcont". In
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367 | * opaque this is set to NULL
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368 | */
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369 |
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370 | ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
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371 | {
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372 | BIO *asnin;
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373 | STACK_OF(MIME_HEADER) *headers = NULL;
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374 | STACK_OF(BIO) *parts = NULL;
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375 | MIME_HEADER *hdr;
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376 | MIME_PARAM *prm;
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377 | ASN1_VALUE *val;
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378 | int ret;
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379 |
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380 | if (bcont)
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381 | *bcont = NULL;
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382 |
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383 | if ((headers = mime_parse_hdr(bio)) == NULL) {
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384 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR);
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385 | return NULL;
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386 | }
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387 |
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388 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
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389 | || hdr->value == NULL) {
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390 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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391 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
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392 | return NULL;
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393 | }
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394 |
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395 | /* Handle multipart/signed */
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396 |
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397 | if (strcmp(hdr->value, "multipart/signed") == 0) {
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398 | /* Split into two parts */
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399 | prm = mime_param_find(hdr, "boundary");
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400 | if (!prm || !prm->param_value) {
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401 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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402 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
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403 | return NULL;
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404 | }
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405 | ret = multi_split(bio, prm->param_value, &parts);
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406 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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407 | if (!ret || (sk_BIO_num(parts) != 2)) {
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408 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
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409 | sk_BIO_pop_free(parts, BIO_vfree);
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410 | return NULL;
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411 | }
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412 |
|
---|
413 | /* Parse the signature piece */
|
---|
414 | asnin = sk_BIO_value(parts, 1);
|
---|
415 |
|
---|
416 | if ((headers = mime_parse_hdr(asnin)) == NULL) {
|
---|
417 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR);
|
---|
418 | sk_BIO_pop_free(parts, BIO_vfree);
|
---|
419 | return NULL;
|
---|
420 | }
|
---|
421 |
|
---|
422 | /* Get content type */
|
---|
423 |
|
---|
424 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
|
---|
425 | || hdr->value == NULL) {
|
---|
426 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
427 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
|
---|
428 | return NULL;
|
---|
429 | }
|
---|
430 |
|
---|
431 | if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
|
---|
432 | strcmp(hdr->value, "application/pkcs7-signature")) {
|
---|
433 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE);
|
---|
434 | ERR_add_error_data(2, "type: ", hdr->value);
|
---|
435 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
436 | sk_BIO_pop_free(parts, BIO_vfree);
|
---|
437 | return NULL;
|
---|
438 | }
|
---|
439 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
440 | /* Read in ASN1 */
|
---|
441 | if ((val = b64_read_asn1(asnin, it)) == NULL) {
|
---|
442 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR);
|
---|
443 | sk_BIO_pop_free(parts, BIO_vfree);
|
---|
444 | return NULL;
|
---|
445 | }
|
---|
446 |
|
---|
447 | if (bcont) {
|
---|
448 | *bcont = sk_BIO_value(parts, 0);
|
---|
449 | BIO_free(asnin);
|
---|
450 | sk_BIO_free(parts);
|
---|
451 | } else
|
---|
452 | sk_BIO_pop_free(parts, BIO_vfree);
|
---|
453 | return val;
|
---|
454 | }
|
---|
455 |
|
---|
456 | /* OK, if not multipart/signed try opaque signature */
|
---|
457 |
|
---|
458 | if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
|
---|
459 | strcmp(hdr->value, "application/pkcs7-mime")) {
|
---|
460 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE);
|
---|
461 | ERR_add_error_data(2, "type: ", hdr->value);
|
---|
462 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
463 | return NULL;
|
---|
464 | }
|
---|
465 |
|
---|
466 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
467 |
|
---|
468 | if ((val = b64_read_asn1(bio, it)) == NULL) {
|
---|
469 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
|
---|
470 | return NULL;
|
---|
471 | }
|
---|
472 | return val;
|
---|
473 |
|
---|
474 | }
|
---|
475 |
|
---|
476 | /* Copy text from one BIO to another making the output CRLF at EOL */
|
---|
477 | int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
|
---|
478 | {
|
---|
479 | BIO *bf;
|
---|
480 | char eol;
|
---|
481 | int len;
|
---|
482 | char linebuf[MAX_SMLEN];
|
---|
483 | /*
|
---|
484 | * Buffer output so we don't write one line at a time. This is useful
|
---|
485 | * when streaming as we don't end up with one OCTET STRING per line.
|
---|
486 | */
|
---|
487 | bf = BIO_new(BIO_f_buffer());
|
---|
488 | if (bf == NULL)
|
---|
489 | return 0;
|
---|
490 | out = BIO_push(bf, out);
|
---|
491 | if (flags & SMIME_BINARY) {
|
---|
492 | while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
|
---|
493 | BIO_write(out, linebuf, len);
|
---|
494 | } else {
|
---|
495 | int eolcnt = 0;
|
---|
496 | if (flags & SMIME_TEXT)
|
---|
497 | BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
|
---|
498 | while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
|
---|
499 | eol = strip_eol(linebuf, &len, flags);
|
---|
500 | if (len) {
|
---|
501 | /* Not EOF: write out all CRLF */
|
---|
502 | if (flags & SMIME_ASCIICRLF) {
|
---|
503 | int i;
|
---|
504 | for (i = 0; i < eolcnt; i++)
|
---|
505 | BIO_write(out, "\r\n", 2);
|
---|
506 | eolcnt = 0;
|
---|
507 | }
|
---|
508 | BIO_write(out, linebuf, len);
|
---|
509 | if (eol)
|
---|
510 | BIO_write(out, "\r\n", 2);
|
---|
511 | } else if (flags & SMIME_ASCIICRLF)
|
---|
512 | eolcnt++;
|
---|
513 | else if (eol)
|
---|
514 | BIO_write(out, "\r\n", 2);
|
---|
515 | }
|
---|
516 | }
|
---|
517 | (void)BIO_flush(out);
|
---|
518 | BIO_pop(out);
|
---|
519 | BIO_free(bf);
|
---|
520 | return 1;
|
---|
521 | }
|
---|
522 |
|
---|
523 | /* Strip off headers if they are text/plain */
|
---|
524 | int SMIME_text(BIO *in, BIO *out)
|
---|
525 | {
|
---|
526 | char iobuf[4096];
|
---|
527 | int len;
|
---|
528 | STACK_OF(MIME_HEADER) *headers;
|
---|
529 | MIME_HEADER *hdr;
|
---|
530 |
|
---|
531 | if ((headers = mime_parse_hdr(in)) == NULL) {
|
---|
532 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
|
---|
533 | return 0;
|
---|
534 | }
|
---|
535 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
|
---|
536 | || hdr->value == NULL) {
|
---|
537 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE);
|
---|
538 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
539 | return 0;
|
---|
540 | }
|
---|
541 | if (strcmp(hdr->value, "text/plain")) {
|
---|
542 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE);
|
---|
543 | ERR_add_error_data(2, "type: ", hdr->value);
|
---|
544 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
545 | return 0;
|
---|
546 | }
|
---|
547 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
548 | while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
|
---|
549 | BIO_write(out, iobuf, len);
|
---|
550 | if (len < 0)
|
---|
551 | return 0;
|
---|
552 | return 1;
|
---|
553 | }
|
---|
554 |
|
---|
555 | /*
|
---|
556 | * Split a multipart/XXX message body into component parts: result is
|
---|
557 | * canonical parts in a STACK of bios
|
---|
558 | */
|
---|
559 |
|
---|
560 | static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret)
|
---|
561 | {
|
---|
562 | char linebuf[MAX_SMLEN];
|
---|
563 | int len, blen;
|
---|
564 | int eol = 0, next_eol = 0;
|
---|
565 | BIO *bpart = NULL;
|
---|
566 | STACK_OF(BIO) *parts;
|
---|
567 | char state, part, first;
|
---|
568 |
|
---|
569 | blen = strlen(bound);
|
---|
570 | part = 0;
|
---|
571 | state = 0;
|
---|
572 | first = 1;
|
---|
573 | parts = sk_BIO_new_null();
|
---|
574 | *ret = parts;
|
---|
575 | if (*ret == NULL)
|
---|
576 | return 0;
|
---|
577 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
|
---|
578 | state = mime_bound_check(linebuf, len, bound, blen);
|
---|
579 | if (state == 1) {
|
---|
580 | first = 1;
|
---|
581 | part++;
|
---|
582 | } else if (state == 2) {
|
---|
583 | if (!sk_BIO_push(parts, bpart)) {
|
---|
584 | BIO_free(bpart);
|
---|
585 | return 0;
|
---|
586 | }
|
---|
587 | return 1;
|
---|
588 | } else if (part) {
|
---|
589 | /* Strip CR+LF from linebuf */
|
---|
590 | next_eol = strip_eol(linebuf, &len, 0);
|
---|
591 | if (first) {
|
---|
592 | first = 0;
|
---|
593 | if (bpart)
|
---|
594 | if (!sk_BIO_push(parts, bpart)) {
|
---|
595 | BIO_free(bpart);
|
---|
596 | return 0;
|
---|
597 | }
|
---|
598 | bpart = BIO_new(BIO_s_mem());
|
---|
599 | if (bpart == NULL)
|
---|
600 | return 0;
|
---|
601 | BIO_set_mem_eof_return(bpart, 0);
|
---|
602 | } else if (eol)
|
---|
603 | BIO_write(bpart, "\r\n", 2);
|
---|
604 | eol = next_eol;
|
---|
605 | if (len)
|
---|
606 | BIO_write(bpart, linebuf, len);
|
---|
607 | }
|
---|
608 | }
|
---|
609 | BIO_free(bpart);
|
---|
610 | return 0;
|
---|
611 | }
|
---|
612 |
|
---|
613 | /* This is the big one: parse MIME header lines up to message body */
|
---|
614 |
|
---|
615 | #define MIME_INVALID 0
|
---|
616 | #define MIME_START 1
|
---|
617 | #define MIME_TYPE 2
|
---|
618 | #define MIME_NAME 3
|
---|
619 | #define MIME_VALUE 4
|
---|
620 | #define MIME_QUOTE 5
|
---|
621 | #define MIME_COMMENT 6
|
---|
622 |
|
---|
623 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
|
---|
624 | {
|
---|
625 | char *p, *q, c;
|
---|
626 | char *ntmp;
|
---|
627 | char linebuf[MAX_SMLEN];
|
---|
628 | MIME_HEADER *mhdr = NULL, *new_hdr = NULL;
|
---|
629 | STACK_OF(MIME_HEADER) *headers;
|
---|
630 | int len, state, save_state = 0;
|
---|
631 |
|
---|
632 | headers = sk_MIME_HEADER_new(mime_hdr_cmp);
|
---|
633 | if (headers == NULL)
|
---|
634 | return NULL;
|
---|
635 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
|
---|
636 | /* If whitespace at line start then continuation line */
|
---|
637 | if (mhdr && isspace((unsigned char)linebuf[0]))
|
---|
638 | state = MIME_NAME;
|
---|
639 | else
|
---|
640 | state = MIME_START;
|
---|
641 | ntmp = NULL;
|
---|
642 | /* Go through all characters */
|
---|
643 | for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
|
---|
644 | p++) {
|
---|
645 |
|
---|
646 | /*
|
---|
647 | * State machine to handle MIME headers if this looks horrible
|
---|
648 | * that's because it *is*
|
---|
649 | */
|
---|
650 |
|
---|
651 | switch (state) {
|
---|
652 | case MIME_START:
|
---|
653 | if (c == ':') {
|
---|
654 | state = MIME_TYPE;
|
---|
655 | *p = 0;
|
---|
656 | ntmp = strip_ends(q);
|
---|
657 | q = p + 1;
|
---|
658 | }
|
---|
659 | break;
|
---|
660 |
|
---|
661 | case MIME_TYPE:
|
---|
662 | if (c == ';') {
|
---|
663 | mime_debug("Found End Value\n");
|
---|
664 | *p = 0;
|
---|
665 | new_hdr = mime_hdr_new(ntmp, strip_ends(q));
|
---|
666 | if (new_hdr == NULL)
|
---|
667 | goto err;
|
---|
668 | if (!sk_MIME_HEADER_push(headers, new_hdr))
|
---|
669 | goto err;
|
---|
670 | mhdr = new_hdr;
|
---|
671 | new_hdr = NULL;
|
---|
672 | ntmp = NULL;
|
---|
673 | q = p + 1;
|
---|
674 | state = MIME_NAME;
|
---|
675 | } else if (c == '(') {
|
---|
676 | save_state = state;
|
---|
677 | state = MIME_COMMENT;
|
---|
678 | }
|
---|
679 | break;
|
---|
680 |
|
---|
681 | case MIME_COMMENT:
|
---|
682 | if (c == ')') {
|
---|
683 | state = save_state;
|
---|
684 | }
|
---|
685 | break;
|
---|
686 |
|
---|
687 | case MIME_NAME:
|
---|
688 | if (c == '=') {
|
---|
689 | state = MIME_VALUE;
|
---|
690 | *p = 0;
|
---|
691 | ntmp = strip_ends(q);
|
---|
692 | q = p + 1;
|
---|
693 | }
|
---|
694 | break;
|
---|
695 |
|
---|
696 | case MIME_VALUE:
|
---|
697 | if (c == ';') {
|
---|
698 | state = MIME_NAME;
|
---|
699 | *p = 0;
|
---|
700 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
|
---|
701 | ntmp = NULL;
|
---|
702 | q = p + 1;
|
---|
703 | } else if (c == '"') {
|
---|
704 | mime_debug("Found Quote\n");
|
---|
705 | state = MIME_QUOTE;
|
---|
706 | } else if (c == '(') {
|
---|
707 | save_state = state;
|
---|
708 | state = MIME_COMMENT;
|
---|
709 | }
|
---|
710 | break;
|
---|
711 |
|
---|
712 | case MIME_QUOTE:
|
---|
713 | if (c == '"') {
|
---|
714 | mime_debug("Found Match Quote\n");
|
---|
715 | state = MIME_VALUE;
|
---|
716 | }
|
---|
717 | break;
|
---|
718 | }
|
---|
719 | }
|
---|
720 |
|
---|
721 | if (state == MIME_TYPE) {
|
---|
722 | new_hdr = mime_hdr_new(ntmp, strip_ends(q));
|
---|
723 | if (new_hdr == NULL)
|
---|
724 | goto err;
|
---|
725 | if (!sk_MIME_HEADER_push(headers, new_hdr))
|
---|
726 | goto err;
|
---|
727 | mhdr = new_hdr;
|
---|
728 | new_hdr = NULL;
|
---|
729 | } else if (state == MIME_VALUE)
|
---|
730 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
|
---|
731 | if (p == linebuf)
|
---|
732 | break; /* Blank line means end of headers */
|
---|
733 | }
|
---|
734 |
|
---|
735 | return headers;
|
---|
736 |
|
---|
737 | err:
|
---|
738 | mime_hdr_free(new_hdr);
|
---|
739 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
740 | return NULL;
|
---|
741 | }
|
---|
742 |
|
---|
743 | static char *strip_ends(char *name)
|
---|
744 | {
|
---|
745 | return strip_end(strip_start(name));
|
---|
746 | }
|
---|
747 |
|
---|
748 | /* Strip a parameter of whitespace from start of param */
|
---|
749 | static char *strip_start(char *name)
|
---|
750 | {
|
---|
751 | char *p, c;
|
---|
752 | /* Look for first non white space or quote */
|
---|
753 | for (p = name; (c = *p); p++) {
|
---|
754 | if (c == '"') {
|
---|
755 | /* Next char is start of string if non null */
|
---|
756 | if (p[1])
|
---|
757 | return p + 1;
|
---|
758 | /* Else null string */
|
---|
759 | return NULL;
|
---|
760 | }
|
---|
761 | if (!isspace((unsigned char)c))
|
---|
762 | return p;
|
---|
763 | }
|
---|
764 | return NULL;
|
---|
765 | }
|
---|
766 |
|
---|
767 | /* As above but strip from end of string : maybe should handle brackets? */
|
---|
768 | static char *strip_end(char *name)
|
---|
769 | {
|
---|
770 | char *p, c;
|
---|
771 | if (!name)
|
---|
772 | return NULL;
|
---|
773 | /* Look for first non white space or quote */
|
---|
774 | for (p = name + strlen(name) - 1; p >= name; p--) {
|
---|
775 | c = *p;
|
---|
776 | if (c == '"') {
|
---|
777 | if (p - 1 == name)
|
---|
778 | return NULL;
|
---|
779 | *p = 0;
|
---|
780 | return name;
|
---|
781 | }
|
---|
782 | if (isspace((unsigned char)c))
|
---|
783 | *p = 0;
|
---|
784 | else
|
---|
785 | return name;
|
---|
786 | }
|
---|
787 | return NULL;
|
---|
788 | }
|
---|
789 |
|
---|
790 | static MIME_HEADER *mime_hdr_new(const char *name, const char *value)
|
---|
791 | {
|
---|
792 | MIME_HEADER *mhdr = NULL;
|
---|
793 | char *tmpname = NULL, *tmpval = NULL, *p;
|
---|
794 | int c;
|
---|
795 |
|
---|
796 | if (name) {
|
---|
797 | if ((tmpname = OPENSSL_strdup(name)) == NULL)
|
---|
798 | return NULL;
|
---|
799 | for (p = tmpname; *p; p++) {
|
---|
800 | c = (unsigned char)*p;
|
---|
801 | if (isupper(c)) {
|
---|
802 | c = tolower(c);
|
---|
803 | *p = c;
|
---|
804 | }
|
---|
805 | }
|
---|
806 | }
|
---|
807 | if (value) {
|
---|
808 | if ((tmpval = OPENSSL_strdup(value)) == NULL)
|
---|
809 | goto err;
|
---|
810 | for (p = tmpval; *p; p++) {
|
---|
811 | c = (unsigned char)*p;
|
---|
812 | if (isupper(c)) {
|
---|
813 | c = tolower(c);
|
---|
814 | *p = c;
|
---|
815 | }
|
---|
816 | }
|
---|
817 | }
|
---|
818 | mhdr = OPENSSL_malloc(sizeof(*mhdr));
|
---|
819 | if (mhdr == NULL)
|
---|
820 | goto err;
|
---|
821 | mhdr->name = tmpname;
|
---|
822 | mhdr->value = tmpval;
|
---|
823 | if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL)
|
---|
824 | goto err;
|
---|
825 | return mhdr;
|
---|
826 |
|
---|
827 | err:
|
---|
828 | OPENSSL_free(tmpname);
|
---|
829 | OPENSSL_free(tmpval);
|
---|
830 | OPENSSL_free(mhdr);
|
---|
831 | return NULL;
|
---|
832 | }
|
---|
833 |
|
---|
834 | static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value)
|
---|
835 | {
|
---|
836 | char *tmpname = NULL, *tmpval = NULL, *p;
|
---|
837 | int c;
|
---|
838 | MIME_PARAM *mparam = NULL;
|
---|
839 | if (name) {
|
---|
840 | tmpname = OPENSSL_strdup(name);
|
---|
841 | if (!tmpname)
|
---|
842 | goto err;
|
---|
843 | for (p = tmpname; *p; p++) {
|
---|
844 | c = (unsigned char)*p;
|
---|
845 | if (isupper(c)) {
|
---|
846 | c = tolower(c);
|
---|
847 | *p = c;
|
---|
848 | }
|
---|
849 | }
|
---|
850 | }
|
---|
851 | if (value) {
|
---|
852 | tmpval = OPENSSL_strdup(value);
|
---|
853 | if (!tmpval)
|
---|
854 | goto err;
|
---|
855 | }
|
---|
856 | /* Parameter values are case sensitive so leave as is */
|
---|
857 | mparam = OPENSSL_malloc(sizeof(*mparam));
|
---|
858 | if (mparam == NULL)
|
---|
859 | goto err;
|
---|
860 | mparam->param_name = tmpname;
|
---|
861 | mparam->param_value = tmpval;
|
---|
862 | if (!sk_MIME_PARAM_push(mhdr->params, mparam))
|
---|
863 | goto err;
|
---|
864 | return 1;
|
---|
865 | err:
|
---|
866 | OPENSSL_free(tmpname);
|
---|
867 | OPENSSL_free(tmpval);
|
---|
868 | OPENSSL_free(mparam);
|
---|
869 | return 0;
|
---|
870 | }
|
---|
871 |
|
---|
872 | static int mime_hdr_cmp(const MIME_HEADER *const *a,
|
---|
873 | const MIME_HEADER *const *b)
|
---|
874 | {
|
---|
875 | if (!(*a)->name || !(*b)->name)
|
---|
876 | return ! !(*a)->name - ! !(*b)->name;
|
---|
877 |
|
---|
878 | return (strcmp((*a)->name, (*b)->name));
|
---|
879 | }
|
---|
880 |
|
---|
881 | static int mime_param_cmp(const MIME_PARAM *const *a,
|
---|
882 | const MIME_PARAM *const *b)
|
---|
883 | {
|
---|
884 | if (!(*a)->param_name || !(*b)->param_name)
|
---|
885 | return ! !(*a)->param_name - ! !(*b)->param_name;
|
---|
886 | return (strcmp((*a)->param_name, (*b)->param_name));
|
---|
887 | }
|
---|
888 |
|
---|
889 | /* Find a header with a given name (if possible) */
|
---|
890 |
|
---|
891 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name)
|
---|
892 | {
|
---|
893 | MIME_HEADER htmp;
|
---|
894 | int idx;
|
---|
895 |
|
---|
896 | htmp.name = (char *)name;
|
---|
897 | htmp.value = NULL;
|
---|
898 | htmp.params = NULL;
|
---|
899 |
|
---|
900 | idx = sk_MIME_HEADER_find(hdrs, &htmp);
|
---|
901 | if (idx < 0)
|
---|
902 | return NULL;
|
---|
903 | return sk_MIME_HEADER_value(hdrs, idx);
|
---|
904 | }
|
---|
905 |
|
---|
906 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name)
|
---|
907 | {
|
---|
908 | MIME_PARAM param;
|
---|
909 | int idx;
|
---|
910 |
|
---|
911 | param.param_name = (char *)name;
|
---|
912 | param.param_value = NULL;
|
---|
913 | idx = sk_MIME_PARAM_find(hdr->params, ¶m);
|
---|
914 | if (idx < 0)
|
---|
915 | return NULL;
|
---|
916 | return sk_MIME_PARAM_value(hdr->params, idx);
|
---|
917 | }
|
---|
918 |
|
---|
919 | static void mime_hdr_free(MIME_HEADER *hdr)
|
---|
920 | {
|
---|
921 | if (hdr == NULL)
|
---|
922 | return;
|
---|
923 | OPENSSL_free(hdr->name);
|
---|
924 | OPENSSL_free(hdr->value);
|
---|
925 | if (hdr->params)
|
---|
926 | sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
|
---|
927 | OPENSSL_free(hdr);
|
---|
928 | }
|
---|
929 |
|
---|
930 | static void mime_param_free(MIME_PARAM *param)
|
---|
931 | {
|
---|
932 | OPENSSL_free(param->param_name);
|
---|
933 | OPENSSL_free(param->param_value);
|
---|
934 | OPENSSL_free(param);
|
---|
935 | }
|
---|
936 |
|
---|
937 | /*-
|
---|
938 | * Check for a multipart boundary. Returns:
|
---|
939 | * 0 : no boundary
|
---|
940 | * 1 : part boundary
|
---|
941 | * 2 : final boundary
|
---|
942 | */
|
---|
943 | static int mime_bound_check(char *line, int linelen, const char *bound, int blen)
|
---|
944 | {
|
---|
945 | if (linelen == -1)
|
---|
946 | linelen = strlen(line);
|
---|
947 | if (blen == -1)
|
---|
948 | blen = strlen(bound);
|
---|
949 | /* Quickly eliminate if line length too short */
|
---|
950 | if (blen + 2 > linelen)
|
---|
951 | return 0;
|
---|
952 | /* Check for part boundary */
|
---|
953 | if ((strncmp(line, "--", 2) == 0)
|
---|
954 | && strncmp(line + 2, bound, blen) == 0) {
|
---|
955 | if (strncmp(line + blen + 2, "--", 2) == 0)
|
---|
956 | return 2;
|
---|
957 | else
|
---|
958 | return 1;
|
---|
959 | }
|
---|
960 | return 0;
|
---|
961 | }
|
---|
962 |
|
---|
963 | static int strip_eol(char *linebuf, int *plen, int flags)
|
---|
964 | {
|
---|
965 | int len = *plen;
|
---|
966 | char *p, c;
|
---|
967 | int is_eol = 0;
|
---|
968 | p = linebuf + len - 1;
|
---|
969 | for (p = linebuf + len - 1; len > 0; len--, p--) {
|
---|
970 | c = *p;
|
---|
971 | if (c == '\n')
|
---|
972 | is_eol = 1;
|
---|
973 | else if (is_eol && flags & SMIME_ASCIICRLF && c < 33)
|
---|
974 | continue;
|
---|
975 | else if (c != '\r')
|
---|
976 | break;
|
---|
977 | }
|
---|
978 | *plen = len;
|
---|
979 | return is_eol;
|
---|
980 | }
|
---|