diff options
author | Dr. Stephen Henson <steve@openssl.org> | 2009-08-09 14:49:00 +0000 |
---|---|---|
committer | Dr. Stephen Henson <steve@openssl.org> | 2009-08-09 14:49:00 +0000 |
commit | 5fffb5b3d9024d7d5f90a3f7b1b7138ed79b328f (patch) | |
tree | cd8db9a260edadf794a6d261255206d4f04fc414 /crypto | |
parent | 17620eec4c883ac1ec78d8a9f4f5ce1ac7bc5393 (diff) |
Backport modified version of MIME wrapper for PKCS#7. This ensures
correct values for micalg among other things.
Diffstat (limited to 'crypto')
-rw-r--r-- | crypto/pkcs7/pk7_mime.c | 662 |
1 files changed, 34 insertions, 628 deletions
diff --git a/crypto/pkcs7/pk7_mime.c b/crypto/pkcs7/pk7_mime.c index bf190360d7..7762d647ca 100644 --- a/crypto/pkcs7/pk7_mime.c +++ b/crypto/pkcs7/pk7_mime.c @@ -50,10 +50,6 @@ * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * - * This product includes cryptographic software written by Eric Young - * (eay@cryptsoft.com). This product includes software written by Tim - * Hudson (tjh@cryptsoft.com). - * */ #include <stdio.h> @@ -61,200 +57,47 @@ #include "cryptlib.h" #include <openssl/rand.h> #include <openssl/x509.h> +#include <openssl/asn1.h> -/* MIME and related routines */ - -/* MIME format structures - * Note that all are translated to lower case apart from - * parameter values. Quotes are stripped off - */ - -typedef struct { -char *param_name; /* Param name e.g. "micalg" */ -char *param_value; /* Param value e.g. "sha1" */ -} MIME_PARAM; - -DECLARE_STACK_OF(MIME_PARAM) -IMPLEMENT_STACK_OF(MIME_PARAM) - -typedef struct { -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 */ -} MIME_HEADER; - -DECLARE_STACK_OF(MIME_HEADER) -IMPLEMENT_STACK_OF(MIME_HEADER) - -static int pkcs7_output_data(BIO *bio, BIO *data, PKCS7 *p7, int flags); -static int B64_write_PKCS7(BIO *bio, PKCS7 *p7); -static PKCS7 *B64_read_PKCS7(BIO *bio); -static char * strip_ends(char *name); -static char * strip_start(char *name); -static char * strip_end(char *name); -static MIME_HEADER *mime_hdr_new(char *name, char *value); -static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, 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, char *bound, int blen); -static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); -static int strip_eol(char *linebuf, int *plen); -static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); -static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); -static void mime_hdr_free(MIME_HEADER *hdr); +/* PKCS#7 wrappers round generalised MIME routines */ -#define MAX_SMLEN 1024 -#define mime_debug(x) /* x */ - -/* Base 64 read and write of PKCS#7 structure */ - -static int B64_write_PKCS7(BIO *bio, PKCS7 *p7) -{ - BIO *b64; - if(!(b64 = BIO_new(BIO_f_base64()))) { - PKCS7err(PKCS7_F_B64_WRITE_PKCS7,ERR_R_MALLOC_FAILURE); - return 0; - } - bio = BIO_push(b64, bio); - i2d_PKCS7_bio(bio, p7); - (void)BIO_flush(bio); - bio = BIO_pop(bio); - BIO_free(b64); - return 1; -} - -static PKCS7 *B64_read_PKCS7(BIO *bio) -{ - BIO *b64; - PKCS7 *p7; - if(!(b64 = BIO_new(BIO_f_base64()))) { - PKCS7err(PKCS7_F_B64_READ_PKCS7,ERR_R_MALLOC_FAILURE); - return 0; - } - bio = BIO_push(b64, bio); - if(!(p7 = d2i_PKCS7_bio(bio, NULL))) - PKCS7err(PKCS7_F_B64_READ_PKCS7,PKCS7_R_DECODE_ERROR); - (void)BIO_flush(bio); - bio = BIO_pop(bio); - BIO_free(b64); - return p7; -} - -/* SMIME sender */ - -int SMIME_write_PKCS7(BIO *bio, PKCS7 *p7, BIO *data, int flags) -{ - char bound[33], c; - int i; - char *mime_prefix, *mime_eol, *msg_type=NULL; - if (flags & PKCS7_NOOLDMIMETYPE) - mime_prefix = "application/pkcs7-"; - else - mime_prefix = "application/x-pkcs7-"; - - if (flags & PKCS7_CRLFEOL) - mime_eol = "\r\n"; - else - mime_eol = "\n"; - if((flags & PKCS7_DETACHED) && data) { - /* We want multipart/signed */ - /* Generate a random boundary */ - RAND_pseudo_bytes((unsigned char *)bound, 32); - 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_printf(bio, " micalg=sha1; 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); - pkcs7_output_data(bio, data, p7, flags); - 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_PKCS7(bio, p7); - BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound, - mime_eol, mime_eol); - return 1; +PKCS7 *SMIME_read_PKCS7(BIO *bio, BIO **bcont) + { + return (PKCS7 *)SMIME_read_ASN1(bio, bcont, ASN1_ITEM_rptr(PKCS7)); } - /* Determine smime-type header */ - - if (PKCS7_type_is_enveloped(p7)) - msg_type = "enveloped-data"; - else if (PKCS7_type_is_signed(p7)) - { - /* If we have any signers it is signed-data othewise - * certs-only. - */ - STACK_OF(PKCS7_SIGNER_INFO) *sinfos; - sinfos = PKCS7_get_signer_info(p7); - if (sk_PKCS7_SIGNER_INFO_num(sinfos) > 0) - msg_type = "signed-data"; - else - msg_type = "certs-only"; - } - /* MIME headers */ - BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); - BIO_printf(bio, "Content-Disposition: attachment;"); - BIO_printf(bio, " filename=\"smime.p7m\"%s", 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=\"smime.p7m\"%s", mime_eol); - BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", - mime_eol, mime_eol); - B64_write_PKCS7(bio, p7); - BIO_printf(bio, "%s", mime_eol); - return 1; -} - -/* Handle output of PKCS#7 data */ +/* Callback for int_smime_write_ASN1 */ - -static int pkcs7_output_data(BIO *out, BIO *data, PKCS7 *p7, int flags) +static int pk7_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, + const ASN1_ITEM *it) { + PKCS7 *p7 = (PKCS7 *)val; BIO *tmpbio, *p7bio; + int r = 0; - if (!(flags & PKCS7_STREAM)) + if (!(flags & SMIME_DETACHED)) { SMIME_crlf_copy(data, out, flags); return 1; } - /* Partial sign operation */ + /* Let PKCS7 code prepend any needed BIOs */ - /* Initialize sign operation */ p7bio = PKCS7_dataInit(p7, out); - /* Copy data across, computing digests etc */ + if (!p7bio) + return 0; + + /* Copy data across, passing through filter BIOs for processing */ SMIME_crlf_copy(data, p7bio, flags); - /* Must be detached */ - PKCS7_set_detached(p7, 1); + /* Finalize structure */ + if (PKCS7_dataFinal(p7, p7bio) <= 0) + goto err; + + r = 1; - /* Finalize signatures */ - PKCS7_dataFinal(p7, p7bio); + err: /* Now remove any digests prepended to the BIO */ @@ -269,454 +112,17 @@ static int pkcs7_output_data(BIO *out, BIO *data, PKCS7 *p7, int flags) } -/* 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 - */ - -PKCS7 *SMIME_read_PKCS7(BIO *bio, BIO **bcont) -{ - BIO *p7in; - STACK_OF(MIME_HEADER) *headers = NULL; - STACK_OF(BIO) *parts = NULL; - MIME_HEADER *hdr; - MIME_PARAM *prm; - PKCS7 *p7; - int ret; - - if(bcont) *bcont = NULL; - - if (!(headers = mime_parse_hdr(bio))) { - PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_PARSE_ERROR); - return NULL; - } - - if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { - sk_MIME_HEADER_pop_free(headers, mime_hdr_free); - PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_CONTENT_TYPE); - return NULL; - } - - /* Handle multipart/signed */ - - if(!strcmp(hdr->value, "multipart/signed")) { - /* Split into two parts */ - prm = mime_param_find(hdr, "boundary"); - if(!prm || !prm->param_value) { - sk_MIME_HEADER_pop_free(headers, mime_hdr_free); - PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BOUNDARY); - return NULL; - } - ret = multi_split(bio, prm->param_value, &parts); - sk_MIME_HEADER_pop_free(headers, mime_hdr_free); - if(!ret || (sk_BIO_num(parts) != 2) ) { - PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BODY_FAILURE); - sk_BIO_pop_free(parts, BIO_vfree); - return NULL; - } - - /* Parse the signature piece */ - p7in = sk_BIO_value(parts, 1); - - if (!(headers = mime_parse_hdr(p7in))) { - PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_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")) || - !hdr->value) { - sk_MIME_HEADER_pop_free(headers, mime_hdr_free); - PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_SIG_CONTENT_TYPE); - return NULL; - } - - if(strcmp(hdr->value, "application/x-pkcs7-signature") && - strcmp(hdr->value, "application/pkcs7-signature")) { - sk_MIME_HEADER_pop_free(headers, mime_hdr_free); - PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_SIG_INVALID_MIME_TYPE); - ERR_add_error_data(2, "type: ", hdr->value); - sk_BIO_pop_free(parts, BIO_vfree); - return NULL; - } - sk_MIME_HEADER_pop_free(headers, mime_hdr_free); - /* Read in PKCS#7 */ - if(!(p7 = B64_read_PKCS7(p7in))) { - PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_PKCS7_SIG_PARSE_ERROR); - sk_BIO_pop_free(parts, BIO_vfree); - return NULL; - } - - if(bcont) { - *bcont = sk_BIO_value(parts, 0); - BIO_free(p7in); - sk_BIO_free(parts); - } else sk_BIO_pop_free(parts, BIO_vfree); - return p7; - } - - /* OK, if not multipart/signed try opaque signature */ - - if (strcmp (hdr->value, "application/x-pkcs7-mime") && - strcmp (hdr->value, "application/pkcs7-mime")) { - PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_INVALID_MIME_TYPE); - ERR_add_error_data(2, "type: ", hdr->value); - sk_MIME_HEADER_pop_free(headers, mime_hdr_free); - return NULL; - } - - sk_MIME_HEADER_pop_free(headers, mime_hdr_free); - - if(!(p7 = B64_read_PKCS7(bio))) { - PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_PKCS7_PARSE_ERROR); - return NULL; - } - return p7; - -} - -/* Split a multipart/XXX message body into component parts: result is - * canonical parts in a STACK of bios - */ - -static int multi_split(BIO *bio, 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; - while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { - state = mime_bound_check(linebuf, len, bound, blen); - if(state == 1) { - first = 1; - part++; - } else if(state == 2) { - sk_BIO_push(parts, bpart); - return 1; - } else if(part) { - /* Strip CR+LF from linebuf */ - next_eol = strip_eol(linebuf, &len); - if(first) { - first = 0; - if(bpart) sk_BIO_push(parts, bpart); - bpart = BIO_new(BIO_s_mem()); - BIO_set_mem_eof_return(bpart, 0); - } else if (eol) - BIO_write(bpart, "\r\n", 2); - eol = next_eol; - if (len) - BIO_write(bpart, linebuf, len); - } - } - 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; - STACK_OF(MIME_HEADER) *headers; - int len, state, save_state = 0; - - headers = sk_MIME_HEADER_new(mime_hdr_cmp); - while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { - /* If whitespace at line start then continuation line */ - if(mhdr && isspace((unsigned char)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; - mhdr = mime_hdr_new(ntmp, strip_ends(q)); - sk_MIME_HEADER_push(headers, mhdr); - 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) { - mhdr = mime_hdr_new(ntmp, strip_ends(q)); - sk_MIME_HEADER_push(headers, mhdr); - } 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; - -} - -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 white space 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(!isspace((unsigned char)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 white space 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(isspace((unsigned char)c)) *p = 0; - else return name; - } - return NULL; -} - -static MIME_HEADER *mime_hdr_new(char *name, char *value) -{ - MIME_HEADER *mhdr; - char *tmpname, *tmpval, *p; - int c; - if(name) { - if(!(tmpname = BUF_strdup(name))) return NULL; - for(p = tmpname ; *p; p++) { - c = *p; - if(isupper(c)) { - c = tolower(c); - *p = c; - } - } - } else tmpname = NULL; - if(value) { - if(!(tmpval = BUF_strdup(value))) return NULL; - for(p = tmpval ; *p; p++) { - c = *p; - if(isupper(c)) { - c = tolower(c); - *p = c; - } - } - } else tmpval = NULL; - mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER)); - if(!mhdr) return NULL; - mhdr->name = tmpname; - mhdr->value = tmpval; - if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL; - return mhdr; -} - -static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) -{ - char *tmpname, *tmpval, *p; - int c; - MIME_PARAM *mparam; - if(name) { - tmpname = BUF_strdup(name); - if(!tmpname) return 0; - for(p = tmpname ; *p; p++) { - c = *p; - if(isupper(c)) { - c = tolower(c); - *p = c; - } - } - } else tmpname = NULL; - if(value) { - tmpval = BUF_strdup(value); - if(!tmpval) return 0; - } else tmpval = NULL; - /* Parameter values are case sensitive so leave as is */ - mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM)); - if(!mparam) return 0; - mparam->param_name = tmpname; - mparam->param_value = tmpval; - sk_MIME_PARAM_push(mhdr->params, mparam); - return 1; -} - -static int mime_hdr_cmp(const MIME_HEADER * const *a, - const MIME_HEADER * const *b) -{ - return(strcmp((*a)->name, (*b)->name)); -} - -static int mime_param_cmp(const MIME_PARAM * const *a, - const MIME_PARAM * const *b) -{ - 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, char *name) -{ - MIME_HEADER htmp; - int idx; - htmp.name = name; - idx = sk_MIME_HEADER_find(hdrs, &htmp); - if(idx < 0) return NULL; - return sk_MIME_HEADER_value(hdrs, idx); -} - -static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) -{ - MIME_PARAM param; - int idx; - param.param_name = name; - idx = sk_MIME_PARAM_find(hdr->params, ¶m); - if(idx < 0) return NULL; - return sk_MIME_PARAM_value(hdr->params, idx); -} - -static void mime_hdr_free(MIME_HEADER *hdr) -{ - if(hdr->name) OPENSSL_free(hdr->name); - if(hdr->value) 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) -{ - if(param->param_name) OPENSSL_free(param->param_name); - if(param->param_value) 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, 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) && !strncmp(line + 2, bound, blen)) { - if(!strncmp(line + blen + 2, "--", 2)) return 2; - else return 1; - } - return 0; -} - -static int strip_eol(char *linebuf, int *plen) +int SMIME_write_PKCS7(BIO *bio, PKCS7 *p7, BIO *data, int flags) { - int len = *plen; - char *p, c; - int is_eol = 0; - p = linebuf + len - 1; - for (p = linebuf + len - 1; len > 0; len--, p--) - { - c = *p; - if (c == '\n') - is_eol = 1; - else if (c != '\r') - break; - } - *plen = len; - return is_eol; + STACK_OF(X509_ALGOR) *mdalgs; + int ctype_nid = OBJ_obj2nid(p7->type); + if (ctype_nid == NID_pkcs7_signed) + mdalgs = p7->d.sign->md_algs; + else + mdalgs = NULL; + + return int_smime_write_ASN1(bio, (ASN1_VALUE *)p7, data, flags, + ctype_nid, NID_undef, mdalgs, + pk7_output_data, + ASN1_ITEM_rptr(PKCS7)); } |