/* * 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 #include "crypto/ctype.h" #include "internal/cryptlib.h" #include #include #include #include #include #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) { 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(it, bio, x); 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) { 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)) == 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)) == 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); } /* 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 ((strncmp(line, "--", 2) == 0) && strncmp(line + 2, bound, blen) == 0) { if (strncmp(line + blen + 2, "--", 2) == 0) return 2; else return 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; }