[331] | 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 */
|
---|
| 396 |
|
---|
| 397 | if (strcmp(hdr->value, "multipart/signed") == 0) {
|
---|
| 398 | /* Split into two parts */
|
---|
| 399 | prm = mime_param_find(hdr, "boundary");
|
---|
| 400 | if (!prm || !prm->param_value) {
|
---|
| 401 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
| 402 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
|
---|
| 403 | return NULL;
|
---|
| 404 | }
|
---|
| 405 | ret = multi_split(bio, prm->param_value, &parts);
|
---|
| 406 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
---|
| 407 | if (!ret || (sk_BIO_num(parts) != 2)) {
|
---|
| 408 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
|
---|
| 409 | sk_BIO_pop_free(parts, BIO_vfree);
|
---|
| 410 | return NULL;
|
---|
| 411 | }
|
---|
| 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 | }
|
---|