| /* |
| * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <stdio.h> |
| #include "crypto/ctype.h" |
| #include "internal/cryptlib.h" |
| #include <openssl/rand.h> |
| #include <openssl/x509.h> |
| #include <openssl/asn1.h> |
| #include <openssl/asn1t.h> |
| #include <openssl/cms.h> |
| #include "crypto/evp.h" |
| #include "internal/bio.h" |
| #include "asn1_local.h" |
| |
| /* |
| * Generalised MIME like utilities for streaming ASN1. Although many have a |
| * PKCS7/CMS like flavour others are more general purpose. |
| */ |
| |
| /* |
| * MIME format structures Note that all are translated to lower case apart |
| * from parameter values. Quotes are stripped off |
| */ |
| |
| struct mime_param_st { |
| char *param_name; /* Param name e.g. "micalg" */ |
| char *param_value; /* Param value e.g. "sha1" */ |
| }; |
| |
| struct mime_header_st { |
| char *name; /* Name of line e.g. "content-type" */ |
| char *value; /* Value of line e.g. "text/plain" */ |
| STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ |
| }; |
| |
| static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, |
| const ASN1_ITEM *it); |
| static char *strip_ends(char *name); |
| static char *strip_start(char *name); |
| static char *strip_end(char *name); |
| static MIME_HEADER *mime_hdr_new(const char *name, const char *value); |
| static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value); |
| static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); |
| static int mime_hdr_cmp(const MIME_HEADER *const *a, |
| const MIME_HEADER *const *b); |
| static int mime_param_cmp(const MIME_PARAM *const *a, |
| const MIME_PARAM *const *b); |
| static void mime_param_free(MIME_PARAM *param); |
| static int mime_bound_check(char *line, int linelen, const char *bound, int blen); |
| static int multi_split(BIO *bio, int flags, const char *bound, STACK_OF(BIO) **ret); |
| static int strip_eol(char *linebuf, int *plen, int flags); |
| static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name); |
| static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name); |
| static void mime_hdr_free(MIME_HEADER *hdr); |
| |
| #define MAX_SMLEN 1024 |
| #define mime_debug(x) /* x */ |
| |
| /* Output an ASN1 structure in BER format streaming if necessary */ |
| |
| /* unfortunately cannot constify this due to CMS_stream() and PKCS7_stream() */ |
| int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, |
| const ASN1_ITEM *it) |
| { |
| /* If streaming create stream BIO and copy all content through it */ |
| if (flags & SMIME_STREAM) { |
| BIO *bio, *tbio; |
| bio = BIO_new_NDEF(out, val, it); |
| if (!bio) { |
| ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| SMIME_crlf_copy(in, bio, flags); |
| (void)BIO_flush(bio); |
| /* Free up successive BIOs until we hit the old output BIO */ |
| do { |
| tbio = BIO_pop(bio); |
| BIO_free(bio); |
| bio = tbio; |
| } while (bio != out); |
| } |
| /* |
| * else just write out ASN1 structure which will have all content stored |
| * internally |
| */ |
| else |
| ASN1_item_i2d_bio(it, out, val); |
| return 1; |
| } |
| |
| /* Base 64 read and write of ASN1 structure */ |
| |
| static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags, |
| const ASN1_ITEM *it) |
| { |
| BIO *b64; |
| int r; |
| b64 = BIO_new(BIO_f_base64()); |
| if (b64 == NULL) { |
| ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| /* |
| * prepend the b64 BIO so all data is base64 encoded. |
| */ |
| out = BIO_push(b64, out); |
| r = i2d_ASN1_bio_stream(out, val, in, flags, it); |
| (void)BIO_flush(out); |
| BIO_pop(out); |
| BIO_free(b64); |
| return r; |
| } |
| |
| /* Streaming ASN1 PEM write */ |
| |
| int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, |
| const char *hdr, const ASN1_ITEM *it) |
| { |
| int r; |
| BIO_printf(out, "-----BEGIN %s-----\n", hdr); |
| r = B64_write_ASN1(out, val, in, flags, it); |
| BIO_printf(out, "-----END %s-----\n", hdr); |
| return r; |
| } |
| |
| static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it, ASN1_VALUE **x, |
| OSSL_LIB_CTX *libctx, const char *propq) |
| { |
| BIO *b64; |
| ASN1_VALUE *val; |
| |
| if ((b64 = BIO_new(BIO_f_base64())) == NULL) { |
| ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| bio = BIO_push(b64, bio); |
| val = ASN1_item_d2i_bio_ex(it, bio, x, libctx, propq); |
| if (!val) |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_DECODE_ERROR); |
| (void)BIO_flush(bio); |
| BIO_pop(bio); |
| BIO_free(b64); |
| return val; |
| } |
| |
| /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ |
| |
| static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) |
| { |
| const EVP_MD *md; |
| int i, have_unknown = 0, write_comma, ret = 0, md_nid; |
| have_unknown = 0; |
| write_comma = 0; |
| for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) { |
| if (write_comma) |
| BIO_write(out, ",", 1); |
| write_comma = 1; |
| md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); |
| md = EVP_get_digestbynid(md_nid); |
| if (md && md->md_ctrl) { |
| int rv; |
| char *micstr; |
| rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr); |
| if (rv > 0) { |
| BIO_puts(out, micstr); |
| OPENSSL_free(micstr); |
| continue; |
| } |
| if (rv != -2) |
| goto err; |
| } |
| switch (md_nid) { |
| case NID_sha1: |
| BIO_puts(out, "sha1"); |
| break; |
| |
| case NID_md5: |
| BIO_puts(out, "md5"); |
| break; |
| |
| case NID_sha256: |
| BIO_puts(out, "sha-256"); |
| break; |
| |
| case NID_sha384: |
| BIO_puts(out, "sha-384"); |
| break; |
| |
| case NID_sha512: |
| BIO_puts(out, "sha-512"); |
| break; |
| |
| case NID_id_GostR3411_94: |
| BIO_puts(out, "gostr3411-94"); |
| goto err; |
| |
| case NID_id_GostR3411_2012_256: |
| BIO_puts(out, "gostr3411-2012-256"); |
| goto err; |
| |
| case NID_id_GostR3411_2012_512: |
| BIO_puts(out, "gostr3411-2012-512"); |
| goto err; |
| |
| default: |
| if (have_unknown) { |
| write_comma = 0; |
| } else { |
| BIO_puts(out, "unknown"); |
| have_unknown = 1; |
| } |
| break; |
| |
| } |
| } |
| |
| ret = 1; |
| err: |
| |
| return ret; |
| |
| } |
| |
| /* SMIME sender */ |
| |
| int SMIME_write_ASN1_ex(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, |
| int ctype_nid, int econt_nid, |
| STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it, |
| OSSL_LIB_CTX *libctx, const char *propq) |
| { |
| char bound[33], c; |
| int i; |
| const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; |
| const char *msg_type = NULL; |
| |
| if (flags & SMIME_OLDMIME) |
| mime_prefix = "application/x-pkcs7-"; |
| else |
| mime_prefix = "application/pkcs7-"; |
| |
| if (flags & SMIME_CRLFEOL) |
| mime_eol = "\r\n"; |
| else |
| mime_eol = "\n"; |
| if ((flags & SMIME_DETACHED) && data) { |
| /* We want multipart/signed */ |
| /* Generate a random boundary */ |
| if (RAND_bytes_ex(libctx, (unsigned char *)bound, 32, 0) <= 0) |
| return 0; |
| for (i = 0; i < 32; i++) { |
| c = bound[i] & 0xf; |
| if (c < 10) |
| c += '0'; |
| else |
| c += 'A' - 10; |
| bound[i] = c; |
| } |
| bound[32] = 0; |
| BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); |
| BIO_printf(bio, "Content-Type: multipart/signed;"); |
| BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); |
| BIO_puts(bio, " micalg=\""); |
| asn1_write_micalg(bio, mdalgs); |
| BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", |
| bound, mime_eol, mime_eol); |
| BIO_printf(bio, "This is an S/MIME signed message%s%s", |
| mime_eol, mime_eol); |
| /* Now write out the first part */ |
| BIO_printf(bio, "------%s%s", bound, mime_eol); |
| if (!asn1_output_data(bio, data, val, flags, it)) |
| return 0; |
| BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); |
| |
| /* Headers for signature */ |
| |
| BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); |
| BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); |
| BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol); |
| BIO_printf(bio, "Content-Disposition: attachment;"); |
| BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol); |
| B64_write_ASN1(bio, val, NULL, 0, it); |
| BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound, |
| mime_eol, mime_eol); |
| return 1; |
| } |
| |
| /* Determine smime-type header */ |
| |
| if (ctype_nid == NID_pkcs7_enveloped) { |
| msg_type = "enveloped-data"; |
| } else if (ctype_nid == NID_pkcs7_signed) { |
| if (econt_nid == NID_id_smime_ct_receipt) |
| msg_type = "signed-receipt"; |
| else if (sk_X509_ALGOR_num(mdalgs) >= 0) |
| msg_type = "signed-data"; |
| else |
| msg_type = "certs-only"; |
| } else if (ctype_nid == NID_id_smime_ct_compressedData) { |
| msg_type = "compressed-data"; |
| cname = "smime.p7z"; |
| } |
| /* MIME headers */ |
| BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); |
| BIO_printf(bio, "Content-Disposition: attachment;"); |
| BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); |
| BIO_printf(bio, "Content-Type: %smime;", mime_prefix); |
| if (msg_type) |
| BIO_printf(bio, " smime-type=%s;", msg_type); |
| BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); |
| BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", |
| mime_eol, mime_eol); |
| if (!B64_write_ASN1(bio, val, data, flags, it)) |
| return 0; |
| BIO_printf(bio, "%s", mime_eol); |
| return 1; |
| } |
| |
| int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, |
| int ctype_nid, int econt_nid, |
| STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it) |
| { |
| return SMIME_write_ASN1_ex(bio, val, data, flags, ctype_nid, econt_nid, |
| mdalgs, it, NULL, NULL); |
| } |
| |
| /* Handle output of ASN1 data */ |
| |
| /* cannot constify val because of CMS_dataFinal() */ |
| static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, |
| const ASN1_ITEM *it) |
| { |
| BIO *tmpbio; |
| const ASN1_AUX *aux = it->funcs; |
| ASN1_STREAM_ARG sarg; |
| int rv = 1; |
| |
| /* |
| * If data is not detached or resigning then the output BIO is already |
| * set up to finalise when it is written through. |
| */ |
| if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) { |
| SMIME_crlf_copy(data, out, flags); |
| return 1; |
| } |
| |
| if (!aux || !aux->asn1_cb) { |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_STREAMING_NOT_SUPPORTED); |
| return 0; |
| } |
| |
| sarg.out = out; |
| sarg.ndef_bio = NULL; |
| sarg.boundary = NULL; |
| |
| /* Let ASN1 code prepend any needed BIOs */ |
| |
| if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) |
| return 0; |
| |
| /* Copy data across, passing through filter BIOs for processing */ |
| SMIME_crlf_copy(data, sarg.ndef_bio, flags); |
| |
| /* Finalize structure */ |
| if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) |
| rv = 0; |
| |
| /* Now remove any digests prepended to the BIO */ |
| |
| while (sarg.ndef_bio != out) { |
| tmpbio = BIO_pop(sarg.ndef_bio); |
| BIO_free(sarg.ndef_bio); |
| sarg.ndef_bio = tmpbio; |
| } |
| |
| return rv; |
| |
| } |
| |
| /* |
| * SMIME reader: handle multipart/signed and opaque signing. in multipart |
| * case the content is placed in a memory BIO pointed to by "bcont". In |
| * opaque this is set to NULL |
| */ |
| |
| ASN1_VALUE *SMIME_read_ASN1_ex(BIO *bio, int flags, BIO **bcont, |
| const ASN1_ITEM *it, ASN1_VALUE **x, |
| OSSL_LIB_CTX *libctx, const char *propq) |
| { |
| BIO *asnin; |
| STACK_OF(MIME_HEADER) *headers = NULL; |
| STACK_OF(BIO) *parts = NULL; |
| MIME_HEADER *hdr; |
| MIME_PARAM *prm; |
| ASN1_VALUE *val; |
| int ret; |
| |
| if (bcont) |
| *bcont = NULL; |
| |
| if ((headers = mime_parse_hdr(bio)) == NULL) { |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_PARSE_ERROR); |
| return NULL; |
| } |
| |
| if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
| || hdr->value == NULL) { |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_CONTENT_TYPE); |
| return NULL; |
| } |
| |
| /* Handle multipart/signed */ |
| |
| if (strcmp(hdr->value, "multipart/signed") == 0) { |
| /* Split into two parts */ |
| prm = mime_param_find(hdr, "boundary"); |
| if (prm == NULL || prm->param_value == NULL) { |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); |
| return NULL; |
| } |
| ret = multi_split(bio, flags, prm->param_value, &parts); |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| if (!ret || (sk_BIO_num(parts) != 2)) { |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); |
| sk_BIO_pop_free(parts, BIO_vfree); |
| return NULL; |
| } |
| |
| /* Parse the signature piece */ |
| asnin = sk_BIO_value(parts, 1); |
| |
| if ((headers = mime_parse_hdr(asnin)) == NULL) { |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR); |
| sk_BIO_pop_free(parts, BIO_vfree); |
| return NULL; |
| } |
| |
| /* Get content type */ |
| |
| if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
| || hdr->value == NULL) { |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); |
| sk_BIO_pop_free(parts, BIO_vfree); |
| return NULL; |
| } |
| |
| if (strcmp(hdr->value, "application/x-pkcs7-signature") && |
| strcmp(hdr->value, "application/pkcs7-signature")) { |
| ERR_raise_data(ERR_LIB_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE, |
| "type: %s", hdr->value); |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| sk_BIO_pop_free(parts, BIO_vfree); |
| return NULL; |
| } |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| /* Read in ASN1 */ |
| if ((val = b64_read_asn1(asnin, it, x, libctx, propq)) == NULL) { |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR); |
| sk_BIO_pop_free(parts, BIO_vfree); |
| return NULL; |
| } |
| |
| if (bcont) { |
| *bcont = sk_BIO_value(parts, 0); |
| BIO_free(asnin); |
| sk_BIO_free(parts); |
| } else { |
| sk_BIO_pop_free(parts, BIO_vfree); |
| } |
| return val; |
| } |
| |
| /* OK, if not multipart/signed try opaque signature */ |
| |
| if (strcmp(hdr->value, "application/x-pkcs7-mime") && |
| strcmp(hdr->value, "application/pkcs7-mime")) { |
| ERR_raise_data(ERR_LIB_ASN1, ASN1_R_INVALID_MIME_TYPE, |
| "type: %s", hdr->value); |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| return NULL; |
| } |
| |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| |
| if ((val = b64_read_asn1(bio, it, x, libctx, propq)) == NULL) { |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_ASN1_PARSE_ERROR); |
| return NULL; |
| } |
| return val; |
| } |
| |
| ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) |
| { |
| return SMIME_read_ASN1_ex(bio, 0, bcont, it, NULL, NULL, NULL); |
| } |
| |
| /* Copy text from one BIO to another making the output CRLF at EOL */ |
| int SMIME_crlf_copy(BIO *in, BIO *out, int flags) |
| { |
| BIO *bf; |
| char eol; |
| int len; |
| char linebuf[MAX_SMLEN]; |
| /* |
| * Buffer output so we don't write one line at a time. This is useful |
| * when streaming as we don't end up with one OCTET STRING per line. |
| */ |
| bf = BIO_new(BIO_f_buffer()); |
| if (bf == NULL) |
| return 0; |
| out = BIO_push(bf, out); |
| if (flags & SMIME_BINARY) { |
| while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) |
| BIO_write(out, linebuf, len); |
| } else { |
| int eolcnt = 0; |
| if (flags & SMIME_TEXT) |
| BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); |
| while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) { |
| eol = strip_eol(linebuf, &len, flags); |
| if (len > 0) { |
| /* Not EOF: write out all CRLF */ |
| if (flags & SMIME_ASCIICRLF) { |
| int i; |
| for (i = 0; i < eolcnt; i++) |
| BIO_write(out, "\r\n", 2); |
| eolcnt = 0; |
| } |
| BIO_write(out, linebuf, len); |
| if (eol) |
| BIO_write(out, "\r\n", 2); |
| } else if (flags & SMIME_ASCIICRLF) { |
| eolcnt++; |
| } else if (eol) { |
| BIO_write(out, "\r\n", 2); |
| } |
| } |
| } |
| (void)BIO_flush(out); |
| BIO_pop(out); |
| BIO_free(bf); |
| return 1; |
| } |
| |
| /* Strip off headers if they are text/plain */ |
| int SMIME_text(BIO *in, BIO *out) |
| { |
| char iobuf[4096]; |
| int len; |
| STACK_OF(MIME_HEADER) *headers; |
| MIME_HEADER *hdr; |
| |
| if ((headers = mime_parse_hdr(in)) == NULL) { |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_PARSE_ERROR); |
| return 0; |
| } |
| if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
| || hdr->value == NULL) { |
| ERR_raise(ERR_LIB_ASN1, ASN1_R_MIME_NO_CONTENT_TYPE); |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| return 0; |
| } |
| if (strcmp(hdr->value, "text/plain")) { |
| ERR_raise_data(ERR_LIB_ASN1, ASN1_R_INVALID_MIME_TYPE, |
| "type: %s", hdr->value); |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| return 0; |
| } |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) |
| BIO_write(out, iobuf, len); |
| if (len < 0) |
| return 0; |
| return 1; |
| } |
| |
| /* |
| * Split a multipart/XXX message body into component parts: result is |
| * canonical parts in a STACK of bios |
| */ |
| |
| static int multi_split(BIO *bio, int flags, const char *bound, STACK_OF(BIO) **ret) |
| { |
| char linebuf[MAX_SMLEN]; |
| int len, blen; |
| int eol = 0, next_eol = 0; |
| BIO *bpart = NULL; |
| STACK_OF(BIO) *parts; |
| char state, part, first; |
| |
| blen = strlen(bound); |
| part = 0; |
| state = 0; |
| first = 1; |
| parts = sk_BIO_new_null(); |
| *ret = parts; |
| if (*ret == NULL) |
| return 0; |
| while ((len = BIO_get_line(bio, linebuf, MAX_SMLEN)) > 0) { |
| state = mime_bound_check(linebuf, len, bound, blen); |
| if (state == 1) { |
| first = 1; |
| part++; |
| } else if (state == 2) { |
| if (!sk_BIO_push(parts, bpart)) { |
| BIO_free(bpart); |
| return 0; |
| } |
| return 1; |
| } else if (part != 0) { |
| /* Strip (possibly CR +) LF from linebuf */ |
| next_eol = strip_eol(linebuf, &len, flags); |
| if (first) { |
| first = 0; |
| if (bpart) |
| if (!sk_BIO_push(parts, bpart)) { |
| BIO_free(bpart); |
| return 0; |
| } |
| bpart = BIO_new(BIO_s_mem()); |
| if (bpart == NULL) |
| return 0; |
| BIO_set_mem_eof_return(bpart, 0); |
| } else if (eol) { |
| if ( |
| #ifndef OPENSSL_NO_CMS |
| (flags & CMS_BINARY) == 0 |
| #else |
| 1 |
| #endif |
| || (flags & SMIME_CRLFEOL) != 0) |
| BIO_write(bpart, "\r\n", 2); |
| else |
| BIO_write(bpart, "\n", 1); |
| } |
| eol = next_eol; |
| if (len > 0) |
| BIO_write(bpart, linebuf, len); |
| } |
| } |
| BIO_free(bpart); |
| return 0; |
| } |
| |
| /* This is the big one: parse MIME header lines up to message body */ |
| |
| #define MIME_INVALID 0 |
| #define MIME_START 1 |
| #define MIME_TYPE 2 |
| #define MIME_NAME 3 |
| #define MIME_VALUE 4 |
| #define MIME_QUOTE 5 |
| #define MIME_COMMENT 6 |
| |
| static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) |
| { |
| char *p, *q, c; |
| char *ntmp; |
| char linebuf[MAX_SMLEN]; |
| MIME_HEADER *mhdr = NULL, *new_hdr = NULL; |
| STACK_OF(MIME_HEADER) *headers; |
| int len, state, save_state = 0; |
| |
| headers = sk_MIME_HEADER_new(mime_hdr_cmp); |
| if (headers == NULL) |
| return NULL; |
| while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { |
| /* If whitespace at line start then continuation line */ |
| if (mhdr && ossl_isspace(linebuf[0])) |
| state = MIME_NAME; |
| else |
| state = MIME_START; |
| ntmp = NULL; |
| /* Go through all characters */ |
| for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n'); |
| p++) { |
| |
| /* |
| * State machine to handle MIME headers if this looks horrible |
| * that's because it *is* |
| */ |
| |
| switch (state) { |
| case MIME_START: |
| if (c == ':') { |
| state = MIME_TYPE; |
| *p = 0; |
| ntmp = strip_ends(q); |
| q = p + 1; |
| } |
| break; |
| |
| case MIME_TYPE: |
| if (c == ';') { |
| mime_debug("Found End Value\n"); |
| *p = 0; |
| new_hdr = mime_hdr_new(ntmp, strip_ends(q)); |
| if (new_hdr == NULL) |
| goto err; |
| if (!sk_MIME_HEADER_push(headers, new_hdr)) |
| goto err; |
| mhdr = new_hdr; |
| new_hdr = NULL; |
| ntmp = NULL; |
| q = p + 1; |
| state = MIME_NAME; |
| } else if (c == '(') { |
| save_state = state; |
| state = MIME_COMMENT; |
| } |
| break; |
| |
| case MIME_COMMENT: |
| if (c == ')') { |
| state = save_state; |
| } |
| break; |
| |
| case MIME_NAME: |
| if (c == '=') { |
| state = MIME_VALUE; |
| *p = 0; |
| ntmp = strip_ends(q); |
| q = p + 1; |
| } |
| break; |
| |
| case MIME_VALUE: |
| if (c == ';') { |
| state = MIME_NAME; |
| *p = 0; |
| mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); |
| ntmp = NULL; |
| q = p + 1; |
| } else if (c == '"') { |
| mime_debug("Found Quote\n"); |
| state = MIME_QUOTE; |
| } else if (c == '(') { |
| save_state = state; |
| state = MIME_COMMENT; |
| } |
| break; |
| |
| case MIME_QUOTE: |
| if (c == '"') { |
| mime_debug("Found Match Quote\n"); |
| state = MIME_VALUE; |
| } |
| break; |
| } |
| } |
| |
| if (state == MIME_TYPE) { |
| new_hdr = mime_hdr_new(ntmp, strip_ends(q)); |
| if (new_hdr == NULL) |
| goto err; |
| if (!sk_MIME_HEADER_push(headers, new_hdr)) |
| goto err; |
| mhdr = new_hdr; |
| new_hdr = NULL; |
| } else if (state == MIME_VALUE) { |
| mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); |
| } |
| if (p == linebuf) |
| break; /* Blank line means end of headers */ |
| } |
| |
| return headers; |
| |
| err: |
| mime_hdr_free(new_hdr); |
| sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
| return NULL; |
| } |
| |
| static char *strip_ends(char *name) |
| { |
| return strip_end(strip_start(name)); |
| } |
| |
| /* Strip a parameter of whitespace from start of param */ |
| static char *strip_start(char *name) |
| { |
| char *p, c; |
| /* Look for first non whitespace or quote */ |
| for (p = name; (c = *p); p++) { |
| if (c == '"') { |
| /* Next char is start of string if non null */ |
| if (p[1]) |
| return p + 1; |
| /* Else null string */ |
| return NULL; |
| } |
| if (!ossl_isspace(c)) |
| return p; |
| } |
| return NULL; |
| } |
| |
| /* As above but strip from end of string : maybe should handle brackets? */ |
| static char *strip_end(char *name) |
| { |
| char *p, c; |
| if (!name) |
| return NULL; |
| /* Look for first non whitespace or quote */ |
| for (p = name + strlen(name) - 1; p >= name; p--) { |
| c = *p; |
| if (c == '"') { |
| if (p - 1 == name) |
| return NULL; |
| *p = 0; |
| return name; |
| } |
| if (ossl_isspace(c)) |
| *p = 0; |
| else |
| return name; |
| } |
| return NULL; |
| } |
| |
| static MIME_HEADER *mime_hdr_new(const char *name, const char *value) |
| { |
| MIME_HEADER *mhdr = NULL; |
| char *tmpname = NULL, *tmpval = NULL, *p; |
| |
| if (name) { |
| if ((tmpname = OPENSSL_strdup(name)) == NULL) |
| return NULL; |
| for (p = tmpname; *p; p++) |
| *p = ossl_tolower(*p); |
| } |
| if (value) { |
| if ((tmpval = OPENSSL_strdup(value)) == NULL) |
| goto err; |
| for (p = tmpval; *p; p++) |
| *p = ossl_tolower(*p); |
| } |
| mhdr = OPENSSL_malloc(sizeof(*mhdr)); |
| if (mhdr == NULL) |
| goto err; |
| mhdr->name = tmpname; |
| mhdr->value = tmpval; |
| if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL) |
| goto err; |
| return mhdr; |
| |
| err: |
| OPENSSL_free(tmpname); |
| OPENSSL_free(tmpval); |
| OPENSSL_free(mhdr); |
| return NULL; |
| } |
| |
| static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value) |
| { |
| char *tmpname = NULL, *tmpval = NULL, *p; |
| MIME_PARAM *mparam = NULL; |
| |
| if (name) { |
| tmpname = OPENSSL_strdup(name); |
| if (!tmpname) |
| goto err; |
| for (p = tmpname; *p; p++) |
| *p = ossl_tolower(*p); |
| } |
| if (value) { |
| tmpval = OPENSSL_strdup(value); |
| if (!tmpval) |
| goto err; |
| } |
| /* Parameter values are case sensitive so leave as is */ |
| mparam = OPENSSL_malloc(sizeof(*mparam)); |
| if (mparam == NULL) |
| goto err; |
| mparam->param_name = tmpname; |
| mparam->param_value = tmpval; |
| if (!sk_MIME_PARAM_push(mhdr->params, mparam)) |
| goto err; |
| return 1; |
| err: |
| OPENSSL_free(tmpname); |
| OPENSSL_free(tmpval); |
| OPENSSL_free(mparam); |
| return 0; |
| } |
| |
| static int mime_hdr_cmp(const MIME_HEADER *const *a, |
| const MIME_HEADER *const *b) |
| { |
| if ((*a)->name == NULL || (*b)->name == NULL) |
| return ((*a)->name != NULL) - ((*b)->name != NULL); |
| |
| return strcmp((*a)->name, (*b)->name); |
| } |
| |
| static int mime_param_cmp(const MIME_PARAM *const *a, |
| const MIME_PARAM *const *b) |
| { |
| if ((*a)->param_name == NULL || (*b)->param_name == NULL) |
| return ((*a)->param_name != NULL) - ((*b)->param_name != NULL); |
| return strcmp((*a)->param_name, (*b)->param_name); |
| } |
| |
| /* Find a header with a given name (if possible) */ |
| |
| static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name) |
| { |
| MIME_HEADER htmp; |
| int idx; |
| |
| htmp.name = (char *)name; |
| htmp.value = NULL; |
| htmp.params = NULL; |
| |
| idx = sk_MIME_HEADER_find(hdrs, &htmp); |
| return sk_MIME_HEADER_value(hdrs, idx); |
| } |
| |
| static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name) |
| { |
| MIME_PARAM param; |
| int idx; |
| |
| param.param_name = (char *)name; |
| param.param_value = NULL; |
| idx = sk_MIME_PARAM_find(hdr->params, ¶m); |
| return sk_MIME_PARAM_value(hdr->params, idx); |
| } |
| |
| static void mime_hdr_free(MIME_HEADER *hdr) |
| { |
| if (hdr == NULL) |
| return; |
| OPENSSL_free(hdr->name); |
| OPENSSL_free(hdr->value); |
| if (hdr->params) |
| sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); |
| OPENSSL_free(hdr); |
| } |
| |
| static void mime_param_free(MIME_PARAM *param) |
| { |
| OPENSSL_free(param->param_name); |
| OPENSSL_free(param->param_value); |
| OPENSSL_free(param); |
| } |
| |
| /*- |
| * Check for a multipart boundary. Returns: |
| * 0 : no boundary |
| * 1 : part boundary |
| * 2 : final boundary |
| */ |
| static int mime_bound_check(char *line, int linelen, const char *bound, int blen) |
| { |
| if (linelen == -1) |
| linelen = strlen(line); |
| if (blen == -1) |
| blen = strlen(bound); |
| /* Quickly eliminate if line length too short */ |
| if (blen + 2 > linelen) |
| return 0; |
| /* Check for part boundary */ |
| if ((CHECK_AND_SKIP_PREFIX(line, "--")) && strncmp(line, bound, blen) == 0) |
| return HAS_PREFIX(line + blen, "--") ? 2 : 1; |
| return 0; |
| } |
| |
| static int strip_eol(char *linebuf, int *plen, int flags) |
| { |
| int len = *plen; |
| char *p, c; |
| int is_eol = 0; |
| |
| #ifndef OPENSSL_NO_CMS |
| if ((flags & CMS_BINARY) != 0) { |
| if (len <= 0 || linebuf[len - 1] != '\n') |
| return 0; |
| if ((flags & SMIME_CRLFEOL) != 0) { |
| if (len <= 1 || linebuf[len - 2] != '\r') |
| return 0; |
| len--; |
| } |
| len--; |
| *plen = len; |
| return 1; |
| } |
| #endif |
| |
| for (p = linebuf + len - 1; len > 0; len--, p--) { |
| c = *p; |
| if (c == '\n') { |
| is_eol = 1; |
| } else if (is_eol && (flags & SMIME_ASCIICRLF) != 0 && c == 32) { |
| /* Strip trailing space on a line; 32 == ASCII for ' ' */ |
| continue; |
| } else if (c != '\r') { |
| break; |
| } |
| } |
| *plen = len; |
| return is_eol; |
| } |
