X-Git-Url: https://vcs.fsf.org/?p=exim.git;a=blobdiff_plain;f=src%2Fsrc%2Fpdkim%2Fpdkim.c;h=29277baeb60acb641b4c3e53aad128931031e4a9;hp=99948ffc582e8fc193a078d6b18abb4e8548a03e;hb=1ed59855863174523aabfba933434950e051e00a;hpb=ac3ad4262e3fe4b6ca02532c706069251c32106e diff --git a/src/src/pdkim/pdkim.c b/src/src/pdkim/pdkim.c index 99948ffc5..29277baeb 100644 --- a/src/src/pdkim/pdkim.c +++ b/src/src/pdkim/pdkim.c @@ -1,7 +1,8 @@ /* * PDKIM - a RFC4871 (DKIM) implementation * - * Copyright (C) 2009 - 2015 Tom Kistner + * Copyright (C) 2009 - 2016 Tom Kistner + * Copyright (C) 2016 Jeremy Harris * * http://duncanthrax.net/pdkim/ * @@ -20,21 +21,31 @@ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ -#include -#include -#include -#include +#include "../exim.h" -#include "pdkim.h" -#include "pdkim-rsa.h" -#include "polarssl/sha1.h" -#include "polarssl/sha2.h" -#include "polarssl/rsa.h" -#include "polarssl/base64.h" +#ifndef DISABLE_DKIM /* entire file */ + +#ifndef SUPPORT_TLS +# error Need SUPPORT_TLS for DKIM +#endif + +#include "crypt_ver.h" + +#ifdef RSA_OPENSSL +# include +# include +# include +#elif defined(RSA_GNUTLS) +# include +# include +#endif + +#include "pdkim.h" +#include "rsa.h" #define PDKIM_SIGNATURE_VERSION "1" -#define PDKIM_PUB_RECORD_VERSION "DKIM1" +#define PDKIM_PUB_RECORD_VERSION US "DKIM1" #define PDKIM_MAX_HEADER_LEN 65536 #define PDKIM_MAX_HEADERS 512 @@ -51,61 +62,59 @@ /* -------------------------------------------------------------------------- */ struct pdkim_stringlist { - char *value; - int tag; - void *next; -}; - -#define PDKIM_STR_ALLOC_FRAG 256 -struct pdkim_str { - char *str; - unsigned int len; - unsigned int allocated; + uschar * value; + int tag; + void * next; }; /* -------------------------------------------------------------------------- */ /* A bunch of list constants */ -const char *pdkim_querymethods[] = { - "dns/txt", +const uschar * pdkim_querymethods[] = { + US"dns/txt", NULL }; -const char *pdkim_algos[] = { - "rsa-sha256", - "rsa-sha1", +const uschar * pdkim_algos[] = { + US"rsa-sha256", + US"rsa-sha1", NULL }; -const char *pdkim_canons[] = { - "simple", - "relaxed", +const uschar * pdkim_canons[] = { + US"simple", + US"relaxed", NULL }; -const char *pdkim_hashes[] = { - "sha256", - "sha1", +const uschar * pdkim_hashes[] = { + US"sha256", + US"sha1", NULL }; -const char *pdkim_keytypes[] = { - "rsa", +const uschar * pdkim_keytypes[] = { + US"rsa", NULL }; typedef struct pdkim_combined_canon_entry { - const char *str; + const uschar * str; int canon_headers; int canon_body; } pdkim_combined_canon_entry; + pdkim_combined_canon_entry pdkim_combined_canons[] = { - { "simple/simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, - { "simple/relaxed", PDKIM_CANON_SIMPLE, PDKIM_CANON_RELAXED }, - { "relaxed/simple", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, - { "relaxed/relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_RELAXED }, - { "simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, - { "relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, - { NULL, 0, 0 } + { US"simple/simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, + { US"simple/relaxed", PDKIM_CANON_SIMPLE, PDKIM_CANON_RELAXED }, + { US"relaxed/simple", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, + { US"relaxed/relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_RELAXED }, + { US"simple", PDKIM_CANON_SIMPLE, PDKIM_CANON_SIMPLE }, + { US"relaxed", PDKIM_CANON_RELAXED, PDKIM_CANON_SIMPLE }, + { NULL, 0, 0 } }; -const char *pdkim_verify_status_str(int status) { +/* -------------------------------------------------------------------------- */ + +const char * +pdkim_verify_status_str(int status) +{ switch(status) { case PDKIM_VERIFY_NONE: return "PDKIM_VERIFY_NONE"; case PDKIM_VERIFY_INVALID: return "PDKIM_VERIFY_INVALID"; @@ -114,13 +123,17 @@ const char *pdkim_verify_status_str(int status) { default: return "PDKIM_VERIFY_UNKNOWN"; } } -const char *pdkim_verify_ext_status_str(int ext_status) { + +const char * +pdkim_verify_ext_status_str(int ext_status) +{ switch(ext_status) { case PDKIM_VERIFY_FAIL_BODY: return "PDKIM_VERIFY_FAIL_BODY"; case PDKIM_VERIFY_FAIL_MESSAGE: return "PDKIM_VERIFY_FAIL_MESSAGE"; case PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE: return "PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE"; case PDKIM_VERIFY_INVALID_BUFFER_SIZE: return "PDKIM_VERIFY_INVALID_BUFFER_SIZE"; - case PDKIM_VERIFY_INVALID_PUBKEY_PARSING: return "PDKIM_VERIFY_INVALID_PUBKEY_PARSING"; + case PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD: return "PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD"; + case PDKIM_VERIFY_INVALID_PUBKEY_IMPORT: return "PDKIM_VERIFY_INVALID_PUBKEY_IMPORT"; default: return "PDKIM_VERIFY_UNKNOWN"; } } @@ -128,395 +141,248 @@ const char *pdkim_verify_ext_status_str(int ext_status) { /* -------------------------------------------------------------------------- */ /* Print debugging functions */ -#ifdef PDKIM_DEBUG -void pdkim_quoteprint(FILE *stream, const char *data, int len, int lf) { - int i; - const unsigned char *p = (const unsigned char *)data; - - for (i=0;i 127) ) - fprintf(stream,"{%02x}",c); - else - fputc(c,stream); +static void +pdkim_quoteprint(const uschar *data, int len) +{ +int i; +for (i = 0; i < len; i++) + { + const int c = data[i]; + switch (c) + { + case ' ' : debug_printf("{SP}"); break; + case '\t': debug_printf("{TB}"); break; + case '\r': debug_printf("{CR}"); break; + case '\n': debug_printf("{LF}"); break; + case '{' : debug_printf("{BO}"); break; + case '}' : debug_printf("{BC}"); break; + default: + if ( (c < 32) || (c > 127) ) + debug_printf("{%02x}", c); + else + debug_printf("%c", c); break; } } - if (lf) - fputc('\n',stream); +debug_printf("\n"); } -void pdkim_hexprint(FILE *stream, const char *data, int len, int lf) { - int i; - const unsigned char *p = (const unsigned char *)data; - for (i=0;ivalue = strdup(str); - if (new_entry->value == NULL) return NULL; - if (base != NULL) { - pdkim_stringlist *last = base; - while (last->next != NULL) { last = last->next; } - last->next = new_entry; - return base; - } - else return new_entry; -} -pdkim_stringlist *pdkim_prepend_stringlist(pdkim_stringlist *base, char *str) { - pdkim_stringlist *new_entry = malloc(sizeof(pdkim_stringlist)); - if (new_entry == NULL) return NULL; - memset(new_entry,0,sizeof(pdkim_stringlist)); - new_entry->value = strdup(str); - if (new_entry->value == NULL) return NULL; - if (base != NULL) { - new_entry->next = base; - } - return new_entry; -} +static pdkim_stringlist * +pdkim_prepend_stringlist(pdkim_stringlist * base, const uschar * str) +{ +pdkim_stringlist * new_entry = store_get(sizeof(pdkim_stringlist)); -/* -------------------------------------------------------------------------- */ -/* A small "growing string" implementation to escape malloc/realloc hell */ -pdkim_str *pdkim_strnew (const char *cstr) { - unsigned int len = cstr?strlen(cstr):0; - pdkim_str *p = malloc(sizeof(pdkim_str)); - if (p == NULL) return NULL; - memset(p,0,sizeof(pdkim_str)); - p->str = malloc(len+1); - if (p->str == NULL) { - free(p); - return NULL; - } - p->allocated=(len+1); - p->len=len; - if (cstr) strcpy(p->str,cstr); - else p->str[p->len] = '\0'; - return p; -} -char *pdkim_strncat(pdkim_str *str, const char *data, int len) { - if ((str->allocated - str->len) < (len+1)) { - /* Extend the buffer */ - int num_frags = ((len+1)/PDKIM_STR_ALLOC_FRAG)+1; - char *n = realloc(str->str, - (str->allocated+(num_frags*PDKIM_STR_ALLOC_FRAG))); - if (n == NULL) return NULL; - str->str = n; - str->allocated += (num_frags*PDKIM_STR_ALLOC_FRAG); - } - strncpy(&(str->str[str->len]),data,len); - str->len+=len; - str->str[str->len] = '\0'; - return str->str; -} -char *pdkim_strcat(pdkim_str *str, const char *cstr) { - return pdkim_strncat(str, cstr, strlen(cstr)); +memset(new_entry, 0, sizeof(pdkim_stringlist)); +new_entry->value = string_copy(str); +if (base) new_entry->next = base; +return new_entry; } -char *pdkim_numcat(pdkim_str *str, unsigned long num) { - char minibuf[20]; - snprintf(minibuf,20,"%lu",num); - return pdkim_strcat(str,minibuf); -} -char *pdkim_strtrim(pdkim_str *str) { - char *p = str->str; - char *q = str->str; - while ( (*p != '\0') && ((*p == '\t') || (*p == ' ')) ) p++; - while (*p != '\0') {*q = *p; q++; p++;} + + +/* Trim whitespace fore & aft */ + +static void +pdkim_strtrim(uschar * str) +{ +uschar * p = str; +uschar * q = str; +while (*p == '\t' || *p == ' ') p++; /* skip whitespace */ +while (*p) {*q = *p; q++; p++;} /* dump the leading whitespace */ +*q = '\0'; +while (q != str && ( (*q == '\0') || (*q == '\t') || (*q == ' ') ) ) + { /* dump trailing whitespace */ *q = '\0'; - while ( (q != str->str) && ( (*q == '\0') || (*q == '\t') || (*q == ' ') ) ) { - *q = '\0'; - q--; + q--; } - str->len = strlen(str->str); - return str->str; -} -char *pdkim_strclear(pdkim_str *str) { - str->str[0] = '\0'; - str->len = 0; - return str->str; -} -void pdkim_strfree(pdkim_str *str) { - if (str == NULL) return; - if (str->str != NULL) free(str->str); - free(str); } /* -------------------------------------------------------------------------- */ -void pdkim_free_pubkey(pdkim_pubkey *pub) { - if (pub) { - if (pub->version != NULL) free(pub->version); - if (pub->granularity != NULL) free(pub->granularity); - if (pub->hashes != NULL) free(pub->hashes); - if (pub->keytype != NULL) free(pub->keytype); - if (pub->srvtype != NULL) free(pub->srvtype); - if (pub->notes != NULL) free(pub->notes); - if (pub->key != NULL) free(pub->key); - free(pub); - } + +DLLEXPORT void +pdkim_free_ctx(pdkim_ctx *ctx) +{ } /* -------------------------------------------------------------------------- */ -void pdkim_free_sig(pdkim_signature *sig) { - if (sig) { - pdkim_signature *next = (pdkim_signature *)sig->next; - - pdkim_stringlist *e = sig->headers; - while(e != NULL) { - pdkim_stringlist *c = e; - if (e->value != NULL) free(e->value); - e = e->next; - free(c); - } +/* Matches the name of the passed raw "header" against + the passed colon-separated "tick", and invalidates + the entry in tick. Returns OK or fail-code */ +/*XXX might be safer done using a pdkim_stringlist for "tick" */ - if (sig->sigdata != NULL) free(sig->sigdata); - if (sig->bodyhash != NULL) free(sig->bodyhash); - if (sig->selector != NULL) free(sig->selector); - if (sig->domain != NULL) free(sig->domain); - if (sig->identity != NULL) free(sig->identity); - if (sig->headernames != NULL) free(sig->headernames); - if (sig->copiedheaders != NULL) free(sig->copiedheaders); - if (sig->rsa_privkey != NULL) free(sig->rsa_privkey); - if (sig->sign_headers != NULL) free(sig->sign_headers); - if (sig->signature_header != NULL) free(sig->signature_header); - if (sig->sha1_body != NULL) free(sig->sha1_body); - if (sig->sha2_body != NULL) free(sig->sha2_body); - - if (sig->pubkey != NULL) pdkim_free_pubkey(sig->pubkey); - - free(sig); - if (next != NULL) pdkim_free_sig(next); - } -} +static int +header_name_match(const uschar * header, uschar * tick) +{ +uschar * hname; +uschar * lcopy; +uschar * p; +uschar * q; +uschar * hcolon = Ustrchr(header, ':'); /* Get header name */ +if (!hcolon) + return PDKIM_FAIL; /* This isn't a header */ -/* -------------------------------------------------------------------------- */ -DLLEXPORT void pdkim_free_ctx(pdkim_ctx *ctx) { - if (ctx) { - pdkim_stringlist *e = ctx->headers; - while(e != NULL) { - pdkim_stringlist *c = e; - if (e->value != NULL) free(e->value); - e = e->next; - free(c); - } - pdkim_free_sig(ctx->sig); - pdkim_strfree(ctx->cur_header); - free(ctx); - } -} +/* if we had strncmpic() we wouldn't need this copy */ +hname = string_copyn(header, hcolon-header); +/* Copy tick-off list locally, so we can punch zeroes into it */ +p = lcopy = string_copy(tick); -/* -------------------------------------------------------------------------- */ -/* Matches the name of the passed raw "header" against - the passed colon-separated "list", starting at entry - "start". Returns the position of the header name in - the list. */ -int header_name_match(const char *header, - char *tick, - int do_tick) { - char *hname; - char *lcopy; - char *p; - char *q; - int rc = PDKIM_FAIL; - - /* Get header name */ - char *hcolon = strchr(header,':'); - if (hcolon == NULL) return rc; /* This isn't a header */ - hname = malloc((hcolon-header)+1); - if (hname == NULL) return PDKIM_ERR_OOM; - memset(hname,0,(hcolon-header)+1); - strncpy(hname,header,(hcolon-header)); - - /* Copy tick-off list locally, so we can punch zeroes into it */ - lcopy = strdup(tick); - if (lcopy == NULL) { - free(hname); - return PDKIM_ERR_OOM; - } - p = lcopy; - q = strchr(p,':'); - while (q != NULL) { - *q = '\0'; - - if (strcasecmp(p,hname) == 0) { - rc = PDKIM_OK; - /* Invalidate header name instance in tick-off list */ - if (do_tick) tick[p-lcopy] = '_'; - goto BAIL; - } +for (q = Ustrchr(p, ':'); q; q = Ustrchr(p, ':')) + { + *q = '\0'; + if (strcmpic(p, hname) == 0) + goto found; - p = q+1; - q = strchr(p,':'); + p = q+1; } - if (strcasecmp(p,hname) == 0) { - rc = PDKIM_OK; - /* Invalidate header name instance in tick-off list */ - if (do_tick) tick[p-lcopy] = '_'; - } +if (strcmpic(p, hname) == 0) + goto found; - BAIL: - free(hname); - free(lcopy); - return rc; +return PDKIM_FAIL; + +found: + /* Invalidate header name instance in tick-off list */ + tick[p-lcopy] = '_'; + return PDKIM_OK; } /* -------------------------------------------------------------------------- */ -/* Performs "relaxed" canonicalization of a header. The returned pointer needs - to be free()d. */ -char *pdkim_relax_header (char *header, int crlf) { - int past_field_name = 0; - int seen_wsp = 0; - char *p = header; - char *q; - char *relaxed = malloc(strlen(header)+3); - if (relaxed == NULL) return NULL; - q = relaxed; - while (*p != '\0') { - int c = *p; - /* Ignore CR & LF */ - if ( (c == '\r') || (c == '\n') ) { - p++; +/* Performs "relaxed" canonicalization of a header. */ + +static uschar * +pdkim_relax_header(const uschar * header, int crlf) +{ +BOOL past_field_name = FALSE; +BOOL seen_wsp = FALSE; +const uschar * p; +uschar * relaxed = store_get(Ustrlen(header)+3); +uschar * q = relaxed; + +for (p = header; *p; p++) + { + uschar c = *p; + /* Ignore CR & LF */ + if (c == '\r' || c == '\n') + continue; + if (c == '\t' || c == ' ') + { + if (seen_wsp) continue; + c = ' '; /* Turns WSP into SP */ + seen_wsp = TRUE; } - if ( (c == '\t') || (c == ' ') ) { - c = ' '; /* Turns WSP into SP */ - if (seen_wsp) { - p++; - continue; - } - else seen_wsp = 1; - } - else { - if ( (!past_field_name) && (c == ':') ) { - if (seen_wsp) q--; /* This removes WSP before the colon */ - seen_wsp = 1; /* This removes WSP after the colon */ - past_field_name = 1; + else + if (!past_field_name && c == ':') + { + if (seen_wsp) q--; /* This removes WSP before the colon */ + seen_wsp = TRUE; /* This removes WSP after the colon */ + past_field_name = TRUE; } - else seen_wsp = 0; - } - /* Lowercase header name */ - if (!past_field_name) c = tolower(c); - *q = c; - p++; - q++; + else + seen_wsp = FALSE; + + /* Lowercase header name */ + if (!past_field_name) c = tolower(c); + *q++ = c; } - if ((q>relaxed) && (*(q-1) == ' ')) q--; /* Squash eventual trailing SP */ - *q = '\0'; - if (crlf) strcat(relaxed,"\r\n"); - return relaxed; + +if (q > relaxed && q[-1] == ' ') q--; /* Squash eventual trailing SP */ + +if (crlf) { *q++ = '\r'; *q++ = '\n'; } +*q = '\0'; +return relaxed; } /* -------------------------------------------------------------------------- */ #define PDKIM_QP_ERROR_DECODE -1 -char *pdkim_decode_qp_char(char *qp_p, int *c) { - char *initial_pos = qp_p; - - /* Advance one char */ - qp_p++; - - /* Check for two hex digits and decode them */ - if (isxdigit(*qp_p) && isxdigit(qp_p[1])) { - /* Do hex conversion */ - if (isdigit(*qp_p)) {*c = *qp_p - '0';} - else {*c = toupper(*qp_p) - 'A' + 10;} - *c <<= 4; - if (isdigit(qp_p[1])) {*c |= qp_p[1] - '0';} - else {*c |= toupper(qp_p[1]) - 'A' + 10;} - return qp_p + 2; + +static uschar * +pdkim_decode_qp_char(uschar *qp_p, int *c) +{ +uschar *initial_pos = qp_p; + +/* Advance one char */ +qp_p++; + +/* Check for two hex digits and decode them */ +if (isxdigit(*qp_p) && isxdigit(qp_p[1])) + { + /* Do hex conversion */ + *c = (isdigit(*qp_p) ? *qp_p - '0' : toupper(*qp_p) - 'A' + 10) << 4; + *c |= isdigit(qp_p[1]) ? qp_p[1] - '0' : toupper(qp_p[1]) - 'A' + 10; + return qp_p + 2; } - /* Illegal char here */ - *c = PDKIM_QP_ERROR_DECODE; - return initial_pos; +/* Illegal char here */ +*c = PDKIM_QP_ERROR_DECODE; +return initial_pos; } /* -------------------------------------------------------------------------- */ -char *pdkim_decode_qp(char *str) { - int nchar = 0; - char *q; - char *p = str; - char *n = malloc(strlen(p)+1); - if (n == NULL) return NULL; - *n = '\0'; - q = n; - while (*p != '\0') { - if (*p == '=') { - p = pdkim_decode_qp_char(p,&nchar); - if (nchar >= 0) { - *q = nchar; - q++; - continue; + +static uschar * +pdkim_decode_qp(uschar * str) +{ +int nchar = 0; +uschar * q; +uschar * p = str; +uschar * n = store_get(Ustrlen(str)+1); + +*n = '\0'; +q = n; +while (*p) + { + if (*p == '=') + { + p = pdkim_decode_qp_char(p, &nchar); + if (nchar >= 0) + { + *q++ = nchar; + continue; } } - else { - *q = *p; - q++; - } - p++; + else + *q++ = *p; + p++; } - *q = '\0'; - return n; +*q = '\0'; +return n; } /* -------------------------------------------------------------------------- */ -char *pdkim_decode_base64(char *str, int *num_decoded) { - int dlen = 0; - char *res; - - base64_decode(NULL, &dlen, (unsigned char *)str, strlen(str)); - res = malloc(dlen+1); - if (res == NULL) return NULL; - if (base64_decode((unsigned char *)res,&dlen,(unsigned char *)str,strlen(str)) != 0) { - free(res); - return NULL; - } - if (num_decoded != NULL) *num_decoded = dlen; - return res; + +static void +pdkim_decode_base64(uschar *str, blob * b) +{ +int dlen; +dlen = b64decode(str, &b->data); +if (dlen < 0) b->data = NULL; +b->len = dlen; } -/* -------------------------------------------------------------------------- */ -char *pdkim_encode_base64(char *str, int num) { - int dlen = 0; - char *res; - - base64_encode(NULL, &dlen, (unsigned char *)str, num); - res = malloc(dlen+1); - if (res == NULL) return NULL; - if (base64_encode((unsigned char *)res,&dlen,(unsigned char *)str,num) != 0) { - free(res); - return NULL; - } - return res; +static uschar * +pdkim_encode_base64(blob * b) +{ +return b64encode(b->data, b->len); } @@ -524,704 +390,664 @@ char *pdkim_encode_base64(char *str, int num) { #define PDKIM_HDR_LIMBO 0 #define PDKIM_HDR_TAG 1 #define PDKIM_HDR_VALUE 2 -pdkim_signature *pdkim_parse_sig_header(pdkim_ctx *ctx, char *raw_hdr) { - pdkim_signature *sig ; - char *p,*q; - pdkim_str *cur_tag = NULL; - pdkim_str *cur_val = NULL; - int past_hname = 0; - int in_b_val = 0; - int where = PDKIM_HDR_LIMBO; - int i; - - sig = malloc(sizeof(pdkim_signature)); - if (sig == NULL) return NULL; - memset(sig,0,sizeof(pdkim_signature)); - sig->bodylength = -1; - - sig->rawsig_no_b_val = malloc(strlen(raw_hdr)+1); - if (sig->rawsig_no_b_val == NULL) { - free(sig); - return NULL; - } - p = raw_hdr; - q = sig->rawsig_no_b_val; - - while (1) { +static pdkim_signature * +pdkim_parse_sig_header(pdkim_ctx *ctx, uschar * raw_hdr) +{ +pdkim_signature *sig ; +uschar *p, *q; +uschar * cur_tag = NULL; int ts = 0, tl = 0; +uschar * cur_val = NULL; int vs = 0, vl = 0; +BOOL past_hname = FALSE; +BOOL in_b_val = FALSE; +int where = PDKIM_HDR_LIMBO; +int i; + +sig = store_get(sizeof(pdkim_signature)); +memset(sig, 0, sizeof(pdkim_signature)); +sig->bodylength = -1; + +q = sig->rawsig_no_b_val = store_get(Ustrlen(raw_hdr)+1); + +for (p = raw_hdr; ; p++) + { + char c = *p; - /* Ignore FWS */ - if ( (*p == '\r') || (*p == '\n') ) - goto NEXT_CHAR; + /* Ignore FWS */ + if (c == '\r' || c == '\n') + goto NEXT_CHAR; - /* Fast-forward through header name */ - if (!past_hname) { - if (*p == ':') past_hname = 1; - goto NEXT_CHAR; + /* Fast-forward through header name */ + if (!past_hname) + { + if (c == ':') past_hname = TRUE; + goto NEXT_CHAR; } - if (where == PDKIM_HDR_LIMBO) { - /* In limbo, just wait for a tag-char to appear */ - if (!((*p >= 'a') && (*p <= 'z'))) - goto NEXT_CHAR; + if (where == PDKIM_HDR_LIMBO) + { + /* In limbo, just wait for a tag-char to appear */ + if (!(c >= 'a' && c <= 'z')) + goto NEXT_CHAR; - where = PDKIM_HDR_TAG; + where = PDKIM_HDR_TAG; } - if (where == PDKIM_HDR_TAG) { - if (cur_tag == NULL) - cur_tag = pdkim_strnew(NULL); - - if ((*p >= 'a') && (*p <= 'z')) - pdkim_strncat(cur_tag,p,1); + if (where == PDKIM_HDR_TAG) + { + if (c >= 'a' && c <= 'z') + cur_tag = string_catn(cur_tag, &ts, &tl, p, 1); - if (*p == '=') { - if (strcmp(cur_tag->str,"b") == 0) { - *q = '='; q++; - in_b_val = 1; - } - where = PDKIM_HDR_VALUE; - goto NEXT_CHAR; + if (c == '=') + { + cur_tag[tl] = '\0'; + if (Ustrcmp(cur_tag, "b") == 0) + { + *q++ = '='; + in_b_val = TRUE; + } + where = PDKIM_HDR_VALUE; + goto NEXT_CHAR; } } - if (where == PDKIM_HDR_VALUE) { - if (cur_val == NULL) - cur_val = pdkim_strnew(NULL); - - if ( (*p == '\r') || (*p == '\n') || (*p == ' ') || (*p == '\t') ) - goto NEXT_CHAR; - - if ( (*p == ';') || (*p == '\0') ) { - if (cur_tag->len > 0) { - pdkim_strtrim(cur_val); - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, " %s=%s\n", cur_tag->str, cur_val->str); - #endif - switch (cur_tag->str[0]) { - case 'b': - switch (cur_tag->str[1]) { - case 'h': - sig->bodyhash = pdkim_decode_base64(cur_val->str,&(sig->bodyhash_len)); - break; - default: - sig->sigdata = pdkim_decode_base64(cur_val->str,&(sig->sigdata_len)); - break; - } - break; - case 'v': - if (strcmp(cur_val->str,PDKIM_SIGNATURE_VERSION) == 0) { - /* We only support version 1, and that is currently the - only version there is. */ - sig->version = 1; - } - break; - case 'a': - i = 0; - while (pdkim_algos[i] != NULL) { - if (strcmp(cur_val->str,pdkim_algos[i]) == 0 ) { - sig->algo = i; - break; - } - i++; - } - break; - case 'c': - i = 0; - while (pdkim_combined_canons[i].str != NULL) { - if (strcmp(cur_val->str,pdkim_combined_canons[i].str) == 0 ) { - sig->canon_headers = pdkim_combined_canons[i].canon_headers; - sig->canon_body = pdkim_combined_canons[i].canon_body; - break; - } - i++; - } - break; - case 'q': - i = 0; - while (pdkim_querymethods[i] != NULL) { - if (strcmp(cur_val->str,pdkim_querymethods[i]) == 0 ) { - sig->querymethod = i; - break; - } - i++; - } - break; - case 's': - sig->selector = strdup(cur_val->str); - break; - case 'd': - sig->domain = strdup(cur_val->str); - break; - case 'i': - sig->identity = pdkim_decode_qp(cur_val->str); - break; - case 't': - sig->created = strtoul(cur_val->str,NULL,10); - break; - case 'x': - sig->expires = strtoul(cur_val->str,NULL,10); - break; - case 'l': - sig->bodylength = strtol(cur_val->str,NULL,10); - break; - case 'h': - sig->headernames = strdup(cur_val->str); - break; - case 'z': - sig->copiedheaders = pdkim_decode_qp(cur_val->str); - break; - default: - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, " Unknown tag encountered\n"); - #endif - break; - } - } - pdkim_strclear(cur_tag); - pdkim_strclear(cur_val); - in_b_val = 0; - where = PDKIM_HDR_LIMBO; - goto NEXT_CHAR; + if (where == PDKIM_HDR_VALUE) + { + if (c == '\r' || c == '\n' || c == ' ' || c == '\t') + goto NEXT_CHAR; + + if (c == ';' || c == '\0') + { + if (tl && vl) + { + cur_val[vl] = '\0'; + pdkim_strtrim(cur_val); + + DEBUG(D_acl) debug_printf(" %s=%s\n", cur_tag, cur_val); + + switch (*cur_tag) + { + case 'b': + if (cur_tag[1] == 'h') + pdkim_decode_base64(cur_val, &sig->bodyhash); + else + pdkim_decode_base64(cur_val, &sig->sigdata); + break; + case 'v': + /* We only support version 1, and that is currently the + only version there is. */ + if (Ustrcmp(cur_val, PDKIM_SIGNATURE_VERSION) == 0) + sig->version = 1; + break; + case 'a': + for (i = 0; pdkim_algos[i]; i++) + if (Ustrcmp(cur_val, pdkim_algos[i]) == 0) + { + sig->algo = i; + break; + } + break; + case 'c': + for (i = 0; pdkim_combined_canons[i].str; i++) + if (Ustrcmp(cur_val, pdkim_combined_canons[i].str) == 0) + { + sig->canon_headers = pdkim_combined_canons[i].canon_headers; + sig->canon_body = pdkim_combined_canons[i].canon_body; + break; + } + break; + case 'q': + for (i = 0; pdkim_querymethods[i]; i++) + if (Ustrcmp(cur_val, pdkim_querymethods[i]) == 0) + { + sig->querymethod = i; + break; + } + break; + case 's': + sig->selector = string_copy(cur_val); break; + case 'd': + sig->domain = string_copy(cur_val); break; + case 'i': + sig->identity = pdkim_decode_qp(cur_val); break; + case 't': + sig->created = strtoul(CS cur_val, NULL, 10); break; + case 'x': + sig->expires = strtoul(CS cur_val, NULL, 10); break; + case 'l': + sig->bodylength = strtol(CS cur_val, NULL, 10); break; + case 'h': + sig->headernames = string_copy(cur_val); break; + case 'z': + sig->copiedheaders = pdkim_decode_qp(cur_val); break; + default: + DEBUG(D_acl) debug_printf(" Unknown tag encountered\n"); + break; + } + } + tl = 0; + vl = 0; + in_b_val = FALSE; + where = PDKIM_HDR_LIMBO; } - else pdkim_strncat(cur_val,p,1); + else + cur_val = string_catn(cur_val, &vs, &vl, p, 1); } - NEXT_CHAR: - if (*p == '\0') break; +NEXT_CHAR: + if (c == '\0') + break; - if (!in_b_val) { - *q = *p; - q++; - } - p++; + if (!in_b_val) + *q++ = c; } - /* Make sure the most important bits are there. */ - if (!(sig->domain && (*(sig->domain) != '\0') && - sig->selector && (*(sig->selector) != '\0') && - sig->headernames && (*(sig->headernames) != '\0') && - sig->bodyhash && - sig->sigdata && - sig->version)) { - pdkim_free_sig(sig); - return NULL; - } +/* Make sure the most important bits are there. */ +if (!sig->version) + return NULL; +*q = '\0'; +/* Chomp raw header. The final newline must not be added to the signature. */ +while (--q > sig->rawsig_no_b_val && (*q == '\r' || *q == '\n')) *q = '\0'; - /* Chomp raw header. The final newline must not be added to the signature. */ - q--; - while( (q > sig->rawsig_no_b_val) && ((*q == '\r') || (*q == '\n')) ) { - *q = '\0'; q--; - } - - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, - "PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); - pdkim_quoteprint(ctx->debug_stream, - sig->rawsig_no_b_val, - strlen(sig->rawsig_no_b_val), 1); - fprintf(ctx->debug_stream, - "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - } - #endif - sig->sha1_body = malloc(sizeof(sha1_context)); - if (sig->sha1_body == NULL) { - pdkim_free_sig(sig); - return NULL; - } - sig->sha2_body = malloc(sizeof(sha2_context)); - if (sig->sha2_body == NULL) { - pdkim_free_sig(sig); - return NULL; +DEBUG(D_acl) + { + debug_printf( + "PDKIM >> Raw signature w/o b= tag value >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); + pdkim_quoteprint(US sig->rawsig_no_b_val, Ustrlen(sig->rawsig_no_b_val)); + debug_printf( + "PDKIM >> Sig size: %4u bits\n", (unsigned) sig->sigdata.len*8); + debug_printf( + "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); } - sha1_starts(sig->sha1_body); - sha2_starts(sig->sha2_body,0); - - return sig; +exim_sha_init(&sig->body_hash, sig->algo == PDKIM_ALGO_RSA_SHA1 ? HASH_SHA1 : HASH_SHA256); +return sig; } /* -------------------------------------------------------------------------- */ -pdkim_pubkey *pdkim_parse_pubkey_record(pdkim_ctx *ctx, char *raw_record) { - pdkim_pubkey *pub ; - char *p; - pdkim_str *cur_tag = NULL; - pdkim_str *cur_val = NULL; - int where = PDKIM_HDR_LIMBO; - pub = malloc(sizeof(pdkim_pubkey)); - if (pub == NULL) return NULL; - memset(pub,0,sizeof(pdkim_pubkey)); +static pdkim_pubkey * +pdkim_parse_pubkey_record(pdkim_ctx *ctx, const uschar *raw_record) +{ +pdkim_pubkey *pub; +const uschar *p; +uschar * cur_tag = NULL; int ts = 0, tl = 0; +uschar * cur_val = NULL; int vs = 0, vl = 0; +int where = PDKIM_HDR_LIMBO; - p = raw_record; +pub = store_get(sizeof(pdkim_pubkey)); +memset(pub, 0, sizeof(pdkim_pubkey)); - while (1) { +for (p = raw_record; ; p++) + { + char c = *p; - /* Ignore FWS */ - if ( (*p == '\r') || (*p == '\n') ) - goto NEXT_CHAR; + /* Ignore FWS */ + if (c == '\r' || c == '\n') + goto NEXT_CHAR; - if (where == PDKIM_HDR_LIMBO) { - /* In limbo, just wait for a tag-char to appear */ - if (!((*p >= 'a') && (*p <= 'z'))) - goto NEXT_CHAR; + if (where == PDKIM_HDR_LIMBO) + { + /* In limbo, just wait for a tag-char to appear */ + if (!(c >= 'a' && c <= 'z')) + goto NEXT_CHAR; - where = PDKIM_HDR_TAG; + where = PDKIM_HDR_TAG; } - if (where == PDKIM_HDR_TAG) { - if (cur_tag == NULL) - cur_tag = pdkim_strnew(NULL); - - if ((*p >= 'a') && (*p <= 'z')) - pdkim_strncat(cur_tag,p,1); + if (where == PDKIM_HDR_TAG) + { + if (c >= 'a' && c <= 'z') + cur_tag = string_catn(cur_tag, &ts, &tl, p, 1); - if (*p == '=') { - where = PDKIM_HDR_VALUE; - goto NEXT_CHAR; + if (c == '=') + { + cur_tag[tl] = '\0'; + where = PDKIM_HDR_VALUE; + goto NEXT_CHAR; } } - if (where == PDKIM_HDR_VALUE) { - if (cur_val == NULL) - cur_val = pdkim_strnew(NULL); - - if ( (*p == '\r') || (*p == '\n') ) - goto NEXT_CHAR; - - if ( (*p == ';') || (*p == '\0') ) { - if (cur_tag->len > 0) { - pdkim_strtrim(cur_val); - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, " %s=%s\n", cur_tag->str, cur_val->str); - #endif - switch (cur_tag->str[0]) { - case 'v': - /* This tag isn't evaluated because: - - We only support version DKIM1. - - Which is the default for this value (set below) - - Other versions are currently not specified. */ - break; - case 'h': - pub->hashes = strdup(cur_val->str); - break; - case 'g': - pub->granularity = strdup(cur_val->str); - break; - case 'n': - pub->notes = pdkim_decode_qp(cur_val->str); - break; - case 'p': - pub->key = pdkim_decode_base64(cur_val->str,&(pub->key_len)); - break; - case 'k': - pub->hashes = strdup(cur_val->str); - break; - case 's': - pub->srvtype = strdup(cur_val->str); - break; - case 't': - if (strchr(cur_val->str,'y') != NULL) pub->testing = 1; - if (strchr(cur_val->str,'s') != NULL) pub->no_subdomaining = 1; - break; - default: - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, " Unknown tag encountered\n"); - #endif + if (where == PDKIM_HDR_VALUE) + { + if (c == ';' || c == '\0') + { + if (tl && vl) + { + cur_val[vl] = '\0'; + pdkim_strtrim(cur_val); + DEBUG(D_acl) debug_printf(" %s=%s\n", cur_tag, cur_val); + + switch (cur_tag[0]) + { + case 'v': + /* This tag isn't evaluated because: + - We only support version DKIM1. + - Which is the default for this value (set below) + - Other versions are currently not specified. */ + break; + case 'h': + case 'k': + pub->hashes = string_copy(cur_val); break; + case 'g': + pub->granularity = string_copy(cur_val); break; + case 'n': + pub->notes = pdkim_decode_qp(cur_val); break; + case 'p': + pdkim_decode_base64(US cur_val, &pub->key); break; - } - } - pdkim_strclear(cur_tag); - pdkim_strclear(cur_val); - where = PDKIM_HDR_LIMBO; - goto NEXT_CHAR; + case 's': + pub->srvtype = string_copy(cur_val); break; + case 't': + if (Ustrchr(cur_val, 'y') != NULL) pub->testing = 1; + if (Ustrchr(cur_val, 's') != NULL) pub->no_subdomaining = 1; + break; + default: + DEBUG(D_acl) debug_printf(" Unknown tag encountered\n"); + break; + } + } + tl = 0; + vl = 0; + where = PDKIM_HDR_LIMBO; } - else pdkim_strncat(cur_val,p,1); + else + cur_val = string_catn(cur_val, &vs, &vl, p, 1); } - NEXT_CHAR: - if (*p == '\0') break; - p++; +NEXT_CHAR: + if (c == '\0') break; } - /* Set fallback defaults */ - if (pub->version == NULL) pub->version = strdup(PDKIM_PUB_RECORD_VERSION); - if (pub->granularity == NULL) pub->granularity = strdup("*"); - if (pub->keytype == NULL) pub->keytype = strdup("rsa"); - if (pub->srvtype == NULL) pub->srvtype = strdup("*"); - - /* p= is required */ - if (pub->key == NULL) { - pdkim_free_pubkey(pub); - return NULL; - } +/* Set fallback defaults */ +if (!pub->version ) pub->version = string_copy(PDKIM_PUB_RECORD_VERSION); +if (!pub->granularity) pub->granularity = string_copy(US"*"); +if (!pub->keytype ) pub->keytype = string_copy(US"rsa"); +if (!pub->srvtype ) pub->srvtype = string_copy(US"*"); +/* p= is required */ +if (pub->key.data) return pub; + +return NULL; } /* -------------------------------------------------------------------------- */ -int pdkim_update_bodyhash(pdkim_ctx *ctx, const char *data, int len) { - pdkim_signature *sig = ctx->sig; - /* Cache relaxed version of data */ - char *relaxed_data = NULL; - int relaxed_len = 0; - - /* Traverse all signatures, updating their hashes. */ - while (sig != NULL) { - /* Defaults to simple canon (no further treatment necessary) */ - const char *canon_data = data; - int canon_len = len; - - if (sig->canon_body == PDKIM_CANON_RELAXED) { - /* Relax the line if not done already */ - if (relaxed_data == NULL) { - int seen_wsp = 0; - const char *p = data; - int q = 0; - relaxed_data = malloc(len+1); - if (relaxed_data == NULL) return PDKIM_ERR_OOM; - while (*p != '\0') { - char c = *p; - if (c == '\r') { - if ( (q > 0) && (relaxed_data[q-1] == ' ') ) q--; - } - else if ( (c == '\t') || (c == ' ') ) { - c = ' '; /* Turns WSP into SP */ - if (seen_wsp) { - p++; - continue; - } - else seen_wsp = 1; - } - else seen_wsp = 0; - relaxed_data[q++] = c; - p++; - } - relaxed_data[q] = '\0'; - relaxed_len = q; + +static int +pdkim_update_bodyhash(pdkim_ctx *ctx, const char *data, int len) +{ +pdkim_signature *sig = ctx->sig; +/* Cache relaxed version of data */ +uschar *relaxed_data = NULL; +int relaxed_len = 0; + +/* Traverse all signatures, updating their hashes. */ +while (sig) + { + /* Defaults to simple canon (no further treatment necessary) */ + const uschar *canon_data = CUS data; + int canon_len = len; + + if (sig->canon_body == PDKIM_CANON_RELAXED) + { + /* Relax the line if not done already */ + if (!relaxed_data) + { + BOOL seen_wsp = FALSE; + const char *p; + int q = 0; + + relaxed_data = store_get(len+1); + + for (p = data; *p; p++) + { + char c = *p; + if (c == '\r') + { + if (q > 0 && relaxed_data[q-1] == ' ') + q--; + } + else if (c == '\t' || c == ' ') + { + c = ' '; /* Turns WSP into SP */ + if (seen_wsp) + continue; + seen_wsp = TRUE; + } + else + seen_wsp = FALSE; + relaxed_data[q++] = c; + } + relaxed_data[q] = '\0'; + relaxed_len = q; } - canon_data = relaxed_data; - canon_len = relaxed_len; + canon_data = relaxed_data; + canon_len = relaxed_len; } - /* Make sure we don't exceed the to-be-signed body length */ - if ((sig->bodylength >= 0) && - ((sig->signed_body_bytes+(unsigned long)canon_len) > sig->bodylength)) - canon_len = (sig->bodylength - sig->signed_body_bytes); + /* Make sure we don't exceed the to-be-signed body length */ + if ( sig->bodylength >= 0 + && sig->signed_body_bytes + (unsigned long)canon_len > sig->bodylength + ) + canon_len = sig->bodylength - sig->signed_body_bytes; - if (canon_len > 0) { - if (sig->algo == PDKIM_ALGO_RSA_SHA1) - sha1_update(sig->sha1_body,(unsigned char *)canon_data,canon_len); - else - sha2_update(sig->sha2_body,(unsigned char *)canon_data,canon_len); - sig->signed_body_bytes += canon_len; -#ifdef PDKIM_DEBUG - if (ctx->debug_stream!=NULL) - pdkim_quoteprint(ctx->debug_stream,canon_data,canon_len,1); -#endif + if (canon_len > 0) + { + exim_sha_update(&sig->body_hash, CUS canon_data, canon_len); + sig->signed_body_bytes += canon_len; + DEBUG(D_acl) pdkim_quoteprint(canon_data, canon_len); } - sig = sig->next; + sig = sig->next; } - if (relaxed_data != NULL) free(relaxed_data); - return PDKIM_OK; +return PDKIM_OK; } /* -------------------------------------------------------------------------- */ -int pdkim_finish_bodyhash(pdkim_ctx *ctx) { - pdkim_signature *sig = ctx->sig; - /* Traverse all signatures */ - while (sig != NULL) { +static void +pdkim_finish_bodyhash(pdkim_ctx *ctx) +{ +pdkim_signature *sig; - /* Finish hashes */ - unsigned char bh[32]; /* SHA-256 = 32 Bytes, SHA-1 = 20 Bytes */ - if (sig->algo == PDKIM_ALGO_RSA_SHA1) - sha1_finish(sig->sha1_body,bh); - else - sha2_finish(sig->sha2_body,bh); - - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, "PDKIM [%s] Body bytes hashed: %lu\n", - sig->domain, sig->signed_body_bytes); - fprintf(ctx->debug_stream, "PDKIM [%s] bh computed: ", sig->domain); - pdkim_hexprint(ctx->debug_stream, (char *)bh, - (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1); +/* Traverse all signatures */ +for (sig = ctx->sig; sig; sig = sig->next) + { /* Finish hashes */ + blob bh; + + exim_sha_finish(&sig->body_hash, &bh); + + DEBUG(D_acl) + { + debug_printf("PDKIM [%s] Body bytes hashed: %lu\n" + "PDKIM [%s] bh computed: ", + sig->domain, sig->signed_body_bytes, sig->domain); + pdkim_hexprint(CUS bh.data, bh.len); } - #endif - - /* SIGNING -------------------------------------------------------------- */ - if (ctx->mode == PDKIM_MODE_SIGN) { - sig->bodyhash_len = (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32; - sig->bodyhash = malloc(sig->bodyhash_len); - if (sig->bodyhash == NULL) return PDKIM_ERR_OOM; - memcpy(sig->bodyhash,bh,sig->bodyhash_len); - - /* If bodylength limit is set, and we have received less bytes - than the requested amount, effectively remove the limit tag. */ - if (sig->signed_body_bytes < sig->bodylength) sig->bodylength = -1; + + /* SIGNING -------------------------------------------------------------- */ + if (ctx->mode == PDKIM_MODE_SIGN) + { + sig->bodyhash = bh; + + /* If bodylength limit is set, and we have received less bytes + than the requested amount, effectively remove the limit tag. */ + if (sig->signed_body_bytes < sig->bodylength) + sig->bodylength = -1; } - /* VERIFICATION --------------------------------------------------------- */ - else { - /* Compare bodyhash */ - if (memcmp(bh,sig->bodyhash, - (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32) == 0) { - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, "PDKIM [%s] Body hash verified OK\n", - sig->domain); - #endif + + /* VERIFICATION --------------------------------------------------------- */ + else + { + /* Compare bodyhash */ + if (memcmp(bh.data, sig->bodyhash.data, bh.len) == 0) + { + DEBUG(D_acl) debug_printf("PDKIM [%s] Body hash verified OK\n", sig->domain); } - else { - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, "PDKIM [%s] Body hash did NOT verify\n", - sig->domain); - fprintf(ctx->debug_stream, "PDKIM [%s] bh signature: ", sig->domain); - pdkim_hexprint(ctx->debug_stream, sig->bodyhash, - (sig->algo == PDKIM_ALGO_RSA_SHA1)?20:32,1); - } - #endif - sig->verify_status = PDKIM_VERIFY_FAIL; - sig->verify_ext_status = PDKIM_VERIFY_FAIL_BODY; + else + { + DEBUG(D_acl) + { + debug_printf("PDKIM [%s] bh signature: ", sig->domain); + pdkim_hexprint(sig->bodyhash.data, + exim_sha_hashlen(&sig->body_hash)); + debug_printf("PDKIM [%s] Body hash did NOT verify\n", sig->domain); + } + sig->verify_status = PDKIM_VERIFY_FAIL; + sig->verify_ext_status = PDKIM_VERIFY_FAIL_BODY; } } - - sig = sig->next; } - - return PDKIM_OK; } /* -------------------------------------------------------------------------- */ /* Callback from pdkim_feed below for processing complete body lines */ -int pdkim_bodyline_complete(pdkim_ctx *ctx) { - char *p = ctx->linebuf; - int n = ctx->linebuf_offset; - /* Ignore extra data if we've seen the end-of-data marker */ - if (ctx->seen_eod) goto BAIL; +static int +pdkim_bodyline_complete(pdkim_ctx *ctx) +{ +char *p = ctx->linebuf; +int n = ctx->linebuf_offset; +pdkim_signature *sig = ctx->sig; /*XXX assumes only one sig */ - /* We've always got one extra byte to stuff a zero ... */ - ctx->linebuf[(ctx->linebuf_offset)] = '\0'; +/* Ignore extra data if we've seen the end-of-data marker */ +if (ctx->seen_eod) goto BAIL; - if (ctx->input_mode == PDKIM_INPUT_SMTP) { - /* Terminate on EOD marker */ - if (memcmp(p,".\r\n",3) == 0) { - ctx->seen_eod = 1; - goto BAIL; - } - /* Unstuff dots */ - if (memcmp(p,"..",2) == 0) { - p++; - n--; - } +/* We've always got one extra byte to stuff a zero ... */ +ctx->linebuf[ctx->linebuf_offset] = '\0'; + +/* Terminate on EOD marker */ +if (memcmp(p, ".\r\n", 3) == 0) + { + /* In simple body mode, if any empty lines were buffered, + replace with one. rfc 4871 3.4.3 */ + /*XXX checking the signed-body-bytes is a gross hack; I think + it indicates that all linebreaks should be buffered, including + the one terminating a text line */ + if ( sig && sig->canon_body == PDKIM_CANON_SIMPLE + && sig->signed_body_bytes == 0 + && ctx->num_buffered_crlf > 0 + ) + pdkim_update_bodyhash(ctx, "\r\n", 2); + + ctx->seen_eod = TRUE; + goto BAIL; + } +/* Unstuff dots */ +if (memcmp(p, "..", 2) == 0) + { + p++; + n--; } - /* Empty lines need to be buffered until we find a non-empty line */ - if (memcmp(p,"\r\n",2) == 0) { - ctx->num_buffered_crlf++; - goto BAIL; +/* Empty lines need to be buffered until we find a non-empty line */ +if (memcmp(p, "\r\n", 2) == 0) + { + ctx->num_buffered_crlf++; + goto BAIL; } - if ( ctx->sig - && ctx->sig->canon_body == PDKIM_CANON_RELAXED) { - /* Lines with just spaces need to be buffered too */ - char *check = p; - while(memcmp(check,"\r\n",2) != 0) { - char c = *check; +if (sig && sig->canon_body == PDKIM_CANON_RELAXED) + { + /* Lines with just spaces need to be buffered too */ + char *check = p; + while (memcmp(check, "\r\n", 2) != 0) + { + char c = *check; - if (c != '\t' && c != ' ') - goto PROCESS; - check++; + if (c != '\t' && c != ' ') + goto PROCESS; + check++; } - ctx->num_buffered_crlf++; - goto BAIL; - } + ctx->num_buffered_crlf++; + goto BAIL; +} - PROCESS: - /* At this point, we have a non-empty line, so release the buffered ones. */ - while (ctx->num_buffered_crlf) { - pdkim_update_bodyhash(ctx,"\r\n",2); - ctx->num_buffered_crlf--; +PROCESS: +/* At this point, we have a non-empty line, so release the buffered ones. */ +while (ctx->num_buffered_crlf) + { + pdkim_update_bodyhash(ctx, "\r\n", 2); + ctx->num_buffered_crlf--; } - pdkim_update_bodyhash(ctx,p,n); +pdkim_update_bodyhash(ctx, p, n); - BAIL: - ctx->linebuf_offset = 0; - return PDKIM_OK; +BAIL: +ctx->linebuf_offset = 0; +return PDKIM_OK; } /* -------------------------------------------------------------------------- */ /* Callback from pdkim_feed below for processing complete headers */ #define DKIM_SIGNATURE_HEADERNAME "DKIM-Signature:" -int pdkim_header_complete(pdkim_ctx *ctx) { - pdkim_signature *sig = ctx->sig; - - /* Special case: The last header can have an extra \r appended */ - if ( (ctx->cur_header->len > 1) && - (ctx->cur_header->str[(ctx->cur_header->len)-1] == '\r') ) { - ctx->cur_header->str[(ctx->cur_header->len)-1] = '\0'; - ctx->cur_header->len--; - } - ctx->num_headers++; - if (ctx->num_headers > PDKIM_MAX_HEADERS) goto BAIL; +static int +pdkim_header_complete(pdkim_ctx *ctx) +{ +/* Special case: The last header can have an extra \r appended */ +if ( (ctx->cur_header_len > 1) && + (ctx->cur_header[(ctx->cur_header_len)-1] == '\r') ) + --ctx->cur_header_len; +ctx->cur_header[ctx->cur_header_len] = '\0'; - /* SIGNING -------------------------------------------------------------- */ - if (ctx->mode == PDKIM_MODE_SIGN) { - /* Traverse all signatures */ - while (sig != NULL) { - pdkim_stringlist *list; - - if (header_name_match(ctx->cur_header->str, - sig->sign_headers? - sig->sign_headers: - PDKIM_DEFAULT_SIGN_HEADERS, 0) != PDKIM_OK) goto NEXT_SIG; - - /* Add header to the signed headers list (in reverse order) */ - list = pdkim_prepend_stringlist(sig->headers, - ctx->cur_header->str); - if (list == NULL) return PDKIM_ERR_OOM; - sig->headers = list; - - NEXT_SIG: - sig = sig->next; - } +ctx->num_headers++; +if (ctx->num_headers > PDKIM_MAX_HEADERS) goto BAIL; + +/* SIGNING -------------------------------------------------------------- */ +if (ctx->mode == PDKIM_MODE_SIGN) + { + pdkim_signature *sig; + + for (sig = ctx->sig; sig; sig = sig->next) /* Traverse all signatures */ + + /* Add header to the signed headers list (in reverse order) */ + sig->headers = pdkim_prepend_stringlist(sig->headers, + ctx->cur_header); } - /* DKIM-Signature: headers are added to the verification list */ - if (ctx->mode == PDKIM_MODE_VERIFY) { - if (strncasecmp(ctx->cur_header->str, - DKIM_SIGNATURE_HEADERNAME, - strlen(DKIM_SIGNATURE_HEADERNAME)) == 0) { - pdkim_signature *new_sig; - /* Create and chain new signature block */ - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, - "PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); - #endif - new_sig = pdkim_parse_sig_header(ctx, ctx->cur_header->str); - if (new_sig != NULL) { - pdkim_signature *last_sig = ctx->sig; - if (last_sig == NULL) { - ctx->sig = new_sig; - } - else { - while (last_sig->next != NULL) { last_sig = last_sig->next; } - last_sig->next = new_sig; - } - } - else { - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream,"Error while parsing signature header\n"); - fprintf(ctx->debug_stream, - "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - } - #endif +/* VERIFICATION ----------------------------------------------------------- */ +/* DKIM-Signature: headers are added to the verification list */ +if (ctx->mode == PDKIM_MODE_VERIFY) + { + if (strncasecmp(CCS ctx->cur_header, + DKIM_SIGNATURE_HEADERNAME, + Ustrlen(DKIM_SIGNATURE_HEADERNAME)) == 0) + { + pdkim_signature *new_sig; + + /* Create and chain new signature block */ + DEBUG(D_acl) debug_printf( + "PDKIM >> Found sig, trying to parse >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); + + if ((new_sig = pdkim_parse_sig_header(ctx, ctx->cur_header))) + { + pdkim_signature *last_sig = ctx->sig; + if (!last_sig) + ctx->sig = new_sig; + else + { + while (last_sig->next) last_sig = last_sig->next; + last_sig->next = new_sig; + } } + else + DEBUG(D_acl) debug_printf( + "Error while parsing signature header\n" + "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); } - /* every other header is stored for signature verification */ - else { - pdkim_stringlist *list; - - list = pdkim_prepend_stringlist(ctx->headers, - ctx->cur_header->str); - if (list == NULL) return PDKIM_ERR_OOM; - ctx->headers = list; - } + + /* every other header is stored for signature verification */ + else + ctx->headers = pdkim_prepend_stringlist(ctx->headers, ctx->cur_header); } - BAIL: - pdkim_strclear(ctx->cur_header); /* Re-use existing pdkim_str */ - return PDKIM_OK; +BAIL: +*ctx->cur_header = '\0'; +ctx->cur_header_len = 0; /* leave buffer for reuse */ +return PDKIM_OK; } /* -------------------------------------------------------------------------- */ #define HEADER_BUFFER_FRAG_SIZE 256 -DLLEXPORT int pdkim_feed (pdkim_ctx *ctx, - char *data, - int len) { - int p; - for (p=0;ppast_headers) { - /* Processing body byte */ - ctx->linebuf[(ctx->linebuf_offset)++] = c; - if (c == '\n') { - int rc = pdkim_bodyline_complete(ctx); /* End of line */ - if (rc != PDKIM_OK) return rc; + +DLLEXPORT int +pdkim_feed(pdkim_ctx *ctx, char *data, int len) +{ +int p; + +for (p = 0; ppast_headers) + { + /* Processing body byte */ + ctx->linebuf[ctx->linebuf_offset++] = c; + if (c == '\n') + { + int rc = pdkim_bodyline_complete(ctx); /* End of line */ + if (rc != PDKIM_OK) return rc; } - if (ctx->linebuf_offset == (PDKIM_MAX_BODY_LINE_LEN-1)) - return PDKIM_ERR_LONG_LINE; + if (ctx->linebuf_offset == (PDKIM_MAX_BODY_LINE_LEN-1)) + return PDKIM_ERR_LONG_LINE; } - else { - /* Processing header byte */ - if (c != '\r') { - if (c == '\n') { - if (ctx->seen_lf) { - int rc = pdkim_header_complete(ctx); /* Seen last header line */ - if (rc != PDKIM_OK) return rc; - ctx->past_headers = 1; - ctx->seen_lf = 0; -#ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, - "PDKIM >> Hashed body data, canonicalized >>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); -#endif - continue; - } - else ctx->seen_lf = 1; - } - else if (ctx->seen_lf) { - if (! ((c == '\t') || (c == ' '))) { - int rc = pdkim_header_complete(ctx); /* End of header */ - if (rc != PDKIM_OK) return rc; - } - ctx->seen_lf = 0; - } - } - if (ctx->cur_header == NULL) { - ctx->cur_header = pdkim_strnew(NULL); - if (ctx->cur_header == NULL) return PDKIM_ERR_OOM; + else + { + /* Processing header byte */ + if (c != '\r') + { + if (c == '\n') + { + if (ctx->seen_lf) + { + int rc = pdkim_header_complete(ctx); /* Seen last header line */ + if (rc != PDKIM_OK) return rc; + + ctx->past_headers = TRUE; + ctx->seen_lf = 0; + DEBUG(D_acl) debug_printf( + "PDKIM >> Body data for hash, canonicalized >>>>>>>>>>>>>>>>>>>>>>\n"); + continue; + } + else + ctx->seen_lf = TRUE; + } + else if (ctx->seen_lf) + { + if (!(c == '\t' || c == ' ')) + { + int rc = pdkim_header_complete(ctx); /* End of header */ + if (rc != PDKIM_OK) return rc; + } + ctx->seen_lf = FALSE; + } } - if (ctx->cur_header->len < PDKIM_MAX_HEADER_LEN) - if (pdkim_strncat(ctx->cur_header,&data[p],1) == NULL) - return PDKIM_ERR_OOM; + + if (ctx->cur_header_len < PDKIM_MAX_HEADER_LEN) + ctx->cur_header = string_catn(ctx->cur_header, &ctx->cur_header_size, + &ctx->cur_header_len, CUS &data[p], 1); } } - return PDKIM_OK; +return PDKIM_OK; +} + + + +/* Extend a grwong header with a continuation-linebreak */ +static uschar * +pdkim_hdr_cont(uschar * str, int * size, int * ptr, int * col) +{ +*col = 1; +return string_catn(str, size, ptr, US"\r\n\t", 3); } + + /* * RFC 5322 specifies that header line length SHOULD be no more than 78 * lets make it so! * pdkim_headcat - * returns char* + * + * returns uschar * (not nul-terminated) * * col: this int holds and receives column number (octets since last '\n') * str: partial string to append to + * size: current buffer size for str + * ptr: current tail-pointer for str * pad: padding, split line or space after before or after eg: ";" * intro: - must join to payload eg "h=", usually the tag name * payload: eg base64 data - long data can be split arbitrarily. @@ -1232,692 +1058,597 @@ DLLEXPORT int pdkim_feed (pdkim_ctx *ctx, * "pad" * * no guarantees are made for output given out-of range input. like tag - * names loinger than 78, or bogus col. Input is assumed to be free of line breaks. + * names longer than 78, or bogus col. Input is assumed to be free of line breaks. */ -static char *pdkim_headcat(int *col, pdkim_str *str, const char*pad,const char *intro, const char *payload ) { - size_t l; - if( pad) +static uschar * +pdkim_headcat(int * col, uschar * str, int * size, int * ptr, + const uschar * pad, const uschar * intro, const uschar * payload) +{ +size_t l; + +if (pad) { - l = strlen(pad); - if( *col + l > 78 ) - { - pdkim_strcat(str, "\r\n\t"); - *col=1; - } - pdkim_strncat(str, pad,l); - *col +=l; + l = Ustrlen(pad); + if (*col + l > 78) + str = pdkim_hdr_cont(str, size, ptr, col); + str = string_catn(str, size, ptr, pad, l); + *col += l; } - l=(pad?1:0) + (intro?strlen(intro):0 ); +l = (pad?1:0) + (intro?Ustrlen(intro):0); - if( *col + l > 78 ) +if (*col + l > 78) { /*can't fit intro - start a new line to make room.*/ - pdkim_strcat(str, "\r\n\t"); - *col=1; - l= intro?strlen(intro):0; + str = pdkim_hdr_cont(str, size, ptr, col); + l = intro?Ustrlen(intro):0; } - l += payload ? strlen(payload):0 ; +l += payload ? Ustrlen(payload):0 ; - while(l>77) +while (l>77) { /* this fragment will not fit on a single line */ - if( pad ) + if (pad) { - pdkim_strcat(str, " "); - *col +=1; - pad=NULL; // only want this once - l--; + str = string_catn(str, size, ptr, US" ", 1); + *col += 1; + pad = NULL; /* only want this once */ + l--; } - if( intro ) + + if (intro) { - size_t sl=strlen(intro); - pdkim_strncat(str, intro,sl); - *col +=sl; - l-=sl; - intro=NULL; // only want this once + size_t sl = Ustrlen(intro); + + str = string_catn(str, size, ptr, intro, sl); + *col += sl; + l -= sl; + intro = NULL; /* only want this once */ } - if(payload) + + if (payload) { - size_t sl=strlen(payload); - size_t chomp = *col+sl < 77 ? sl : 78-*col; - pdkim_strncat(str, payload,chomp); - *col +=chomp; - payload+=chomp; - l-=chomp-1; + size_t sl = Ustrlen(payload); + size_t chomp = *col+sl < 77 ? sl : 78-*col; + + str = string_catn(str, size, ptr, payload, chomp); + *col += chomp; + payload += chomp; + l -= chomp-1; } - // the while precondition tells us it didn't fit. - pdkim_strcat(str, "\r\n\t"); - *col=1; + + /* the while precondition tells us it didn't fit. */ + str = pdkim_hdr_cont(str, size, ptr, col); } - if( *col + l > 78 ) + +if (*col + l > 78) { - pdkim_strcat(str, "\r\n\t"); - *col=1; - pad=NULL; + str = pdkim_hdr_cont(str, size, ptr, col); + pad = NULL; } - if( pad ) +if (pad) { - pdkim_strcat(str, " "); - *col +=1; - pad=NULL; + str = string_catn(str, size, ptr, US" ", 1); + *col += 1; + pad = NULL; } - if( intro ) +if (intro) { - size_t sl=strlen(intro); - pdkim_strncat(str, intro,sl); - *col +=sl; - l-=sl; - intro=NULL; + size_t sl = Ustrlen(intro); + + str = string_catn(str, size, ptr, intro, sl); + *col += sl; + l -= sl; + intro = NULL; } - if(payload) + +if (payload) { - size_t sl=strlen(payload); - pdkim_strncat(str, payload,sl); - *col +=sl; + size_t sl = Ustrlen(payload); + + str = string_catn(str, size, ptr, payload, sl); + *col += sl; } - return str->str; +return str; } + /* -------------------------------------------------------------------------- */ -char *pdkim_create_header(pdkim_signature *sig, int final) { - char *rc = NULL; - char *base64_bh = NULL; - char *base64_b = NULL; - int col=0; - pdkim_str *hdr = pdkim_strnew("DKIM-Signature: v="PDKIM_SIGNATURE_VERSION); - if (hdr == NULL) return NULL; - pdkim_str *canon_all = pdkim_strnew(pdkim_canons[sig->canon_headers]); - if (canon_all == NULL) goto BAIL; - - base64_bh = pdkim_encode_base64(sig->bodyhash, sig->bodyhash_len); - if (base64_bh == NULL) goto BAIL; - - col=strlen(hdr->str); - - /* Required and static bits */ - if ( - pdkim_headcat(&col,hdr,";","a=",pdkim_algos[sig->algo]) && - pdkim_headcat(&col,hdr,";","q=",pdkim_querymethods[sig->querymethod]) && - pdkim_strcat(canon_all,"/") && - pdkim_strcat(canon_all,pdkim_canons[sig->canon_body]) && - pdkim_headcat(&col,hdr,";","c=",canon_all->str) && - pdkim_headcat(&col,hdr,";","d=",sig->domain) && - pdkim_headcat(&col,hdr,";","s=",sig->selector) - ) { - /* list of eader names can be split between items. */ + +static uschar * +pdkim_create_header(pdkim_signature *sig, BOOL final) +{ +uschar * base64_bh; +uschar * base64_b; +int col = 0; +uschar * hdr; int hdr_size = 0, hdr_len = 0; +uschar * canon_all; int can_size = 0, can_len = 0; + +canon_all = string_cat (NULL, &can_size, &can_len, + pdkim_canons[sig->canon_headers]); +canon_all = string_catn(canon_all, &can_size, &can_len, US"/", 1); +canon_all = string_cat (canon_all, &can_size, &can_len, + pdkim_canons[sig->canon_body]); +canon_all[can_len] = '\0'; + +hdr = string_cat(NULL, &hdr_size, &hdr_len, + US"DKIM-Signature: v="PDKIM_SIGNATURE_VERSION); +col = hdr_len; + +/* Required and static bits */ +hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"a=", + pdkim_algos[sig->algo]); +hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"q=", + pdkim_querymethods[sig->querymethod]); +hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"c=", + canon_all); +hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"d=", + sig->domain); +hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"s=", + sig->selector); + +/* list of header names can be split between items. */ + { + uschar * n = string_copy(sig->headernames); + uschar * i = US"h="; + uschar * s = US";"; + + while (*n) { - char *n=strdup(sig->headernames); - char *f=n; - char *i="h="; - char *s=";"; - if(!n) goto BAIL; - while (*n) - { - char *c=strchr(n,':'); - if(c) *c='\0'; - if(!i) - { - if (!pdkim_headcat(&col,hdr,NULL,NULL,":")) - { - free(f); - goto BAIL; - } - } - if( !pdkim_headcat(&col,hdr,s,i,n)) - { - free(f); - goto BAIL; - } - if(c) n=c+1 ; else break; - s=NULL; - i=NULL; - } - free(f); - } - if(!pdkim_headcat(&col,hdr,";","bh=",base64_bh)) - goto BAIL; + uschar * c = Ustrchr(n, ':'); - /* Optional bits */ - if (sig->identity != NULL) { - if(!pdkim_headcat(&col,hdr,";","i=",sig->identity)){ - goto BAIL; - } - } + if (c) *c ='\0'; - if (sig->created > 0) { - char minibuf[20]; - snprintf(minibuf,20,"%lu",sig->created); - if(!pdkim_headcat(&col,hdr,";","t=",minibuf)) { - goto BAIL; - } - } - if (sig->expires > 0) { - char minibuf[20]; - snprintf(minibuf,20,"%lu",sig->expires); - if(!pdkim_headcat(&col,hdr,";","x=",minibuf)) { - goto BAIL; - } - } - if (sig->bodylength >= 0) { - char minibuf[20]; - snprintf(minibuf,20,"%lu",sig->bodylength); - if(!pdkim_headcat(&col,hdr,";","l=",minibuf)) { - goto BAIL; - } - } + if (!i) + hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, NULL, NULL, US":"); - /* Preliminary or final version? */ - if (final) { - base64_b = pdkim_encode_base64(sig->sigdata, sig->sigdata_len); - if (base64_b == NULL) goto BAIL; - if(!pdkim_headcat(&col,hdr,";","b=",base64_b)) goto BAIL; - } - else { - if(!pdkim_headcat(&col,hdr,";","b=","")) goto BAIL; - } + hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, s, i, n); - /* add trailing semicolon: I'm not sure if this is actually needed */ - if(!pdkim_headcat(&col,hdr,NULL,";","")) goto BAIL; + if (!c) + break; - goto DONE; + n = c+1; + s = NULL; + i = NULL; + } } - DONE: - rc = strdup(hdr->str); +base64_bh = pdkim_encode_base64(&sig->bodyhash); +hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"bh=", base64_bh); + +/* Optional bits */ +if (sig->identity) + hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"i=", sig->identity); - BAIL: - pdkim_strfree(hdr); - if (canon_all != NULL) pdkim_strfree(canon_all); - if (base64_bh != NULL) free(base64_bh); - if (base64_b != NULL) free(base64_b); - return rc; +if (sig->created > 0) + { + uschar minibuf[20]; + + snprintf(CS minibuf, sizeof(minibuf), "%lu", sig->created); + hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"t=", minibuf); } +if (sig->expires > 0) + { + uschar minibuf[20]; -/* -------------------------------------------------------------------------- */ -DLLEXPORT int pdkim_feed_finish(pdkim_ctx *ctx, pdkim_signature **return_signatures) { - pdkim_signature *sig = ctx->sig; - pdkim_str *headernames = NULL; /* Collected signed header names */ - - /* Check if we must still flush a (partial) header. If that is the - case, the message has no body, and we must compute a body hash - out of '' */ - if (ctx->cur_header && ctx->cur_header->len) { - int rc = pdkim_header_complete(ctx); - if (rc != PDKIM_OK) return rc; - pdkim_update_bodyhash(ctx,"\r\n",2); + snprintf(CS minibuf, sizeof(minibuf), "%lu", sig->expires); + hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"x=", minibuf); } - else { - /* For non-smtp input, check if there's an unfinished line in the - body line buffer. If that is the case, we must add a CRLF to the - hash to properly terminate the message. */ - if ((ctx->input_mode == PDKIM_INPUT_NORMAL) && ctx->linebuf_offset) { - pdkim_update_bodyhash(ctx, ctx->linebuf, ctx->linebuf_offset); - pdkim_update_bodyhash(ctx,"\r\n",2); - } - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, - "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - #endif + +if (sig->bodylength >= 0) + { + uschar minibuf[20]; + + snprintf(CS minibuf, sizeof(minibuf), "%lu", sig->bodylength); + hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"l=", minibuf); } - /* Build (and/or evaluate) body hash */ - if (pdkim_finish_bodyhash(ctx) != PDKIM_OK) return PDKIM_ERR_OOM; +/* Preliminary or final version? */ +base64_b = final ? pdkim_encode_base64(&sig->sigdata) : US""; +hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, US";", US"b=", base64_b); - /* SIGNING -------------------------------------------------------------- */ - if (ctx->mode == PDKIM_MODE_SIGN) { - headernames = pdkim_strnew(NULL); - if (headernames == NULL) return PDKIM_ERR_OOM; +/* add trailing semicolon: I'm not sure if this is actually needed */ +hdr = pdkim_headcat(&col, hdr, &hdr_size, &hdr_len, NULL, US";", US""); + +hdr[hdr_len] = '\0'; +return hdr; +} + + +/* -------------------------------------------------------------------------- */ + +DLLEXPORT int +pdkim_feed_finish(pdkim_ctx *ctx, pdkim_signature **return_signatures) +{ +pdkim_signature *sig = ctx->sig; +uschar * headernames = NULL; /* Collected signed header names */ +int hs = 0, hl = 0; + +/* Check if we must still flush a (partial) header. If that is the + case, the message has no body, and we must compute a body hash + out of '' */ +if (ctx->cur_header && ctx->cur_header_len) + { + int rc = pdkim_header_complete(ctx); + if (rc != PDKIM_OK) return rc; + pdkim_update_bodyhash(ctx, "\r\n", 2); } - /* ---------------------------------------------------------------------- */ +else + DEBUG(D_acl) debug_printf( + "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - while (sig != NULL) { - sha1_context sha1_headers; - sha2_context sha2_headers; - char *sig_hdr; - char headerhash[32]; +/* Build (and/or evaluate) body hash */ +pdkim_finish_bodyhash(ctx); - if (sig->algo == PDKIM_ALGO_RSA_SHA1) - sha1_starts(&sha1_headers); - else - sha2_starts(&sha2_headers,0); - - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, - "PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n"); - #endif - - /* SIGNING ---------------------------------------------------------------- */ - /* When signing, walk through our header list and add them to the hash. As we - go, construct a list of the header's names to use for the h= parameter. */ - if (ctx->mode == PDKIM_MODE_SIGN) { - pdkim_stringlist *p = sig->headers; - while (p != NULL) { - char *rh = NULL; - /* Collect header names (Note: colon presence is guaranteed here) */ - char *q = strchr(p->value,':'); - if (pdkim_strncat(headernames, p->value, - (q-(p->value))+((p->next==NULL)?0:1)) == NULL) - return PDKIM_ERR_OOM; - - if (sig->canon_headers == PDKIM_CANON_RELAXED) - rh = pdkim_relax_header(p->value,1); /* cook header for relaxed canon */ - else - rh = strdup(p->value); /* just copy it for simple canon */ - - if (rh == NULL) return PDKIM_ERR_OOM; - - /* Feed header to the hash algorithm */ - if (sig->algo == PDKIM_ALGO_RSA_SHA1) - sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh)); - else - sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh)); - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1); - #endif - free(rh); - p = p->next; - } +while (sig) + { + BOOL is_sha1 = sig->algo == PDKIM_ALGO_RSA_SHA1; + hctx hhash_ctx; + uschar * sig_hdr; + blob hhash; + blob hdata; + int hdata_alloc = 0; + + hdata.data = NULL; + hdata.len = 0; + + exim_sha_init(&hhash_ctx, is_sha1 ? HASH_SHA1 : HASH_SHA256); + + DEBUG(D_acl) debug_printf( + "PDKIM >> Hashed header data, canonicalized, in sequence >>>>>>>>>>>>>>\n"); + + /* SIGNING ---------------------------------------------------------------- */ + /* When signing, walk through our header list and add them to the hash. As we + go, construct a list of the header's names to use for the h= parameter. + Then append to that list any remaining header names for which there was no + header to sign. */ + + if (ctx->mode == PDKIM_MODE_SIGN) + { + pdkim_stringlist *p; + const uschar * l; + uschar * s; + int sep = 0; + + for (p = sig->headers; p; p = p->next) + if (header_name_match(p->value, sig->sign_headers) == PDKIM_OK) + { + uschar * rh; + /* Collect header names (Note: colon presence is guaranteed here) */ + uschar * q = Ustrchr(p->value, ':'); + + headernames = string_catn(headernames, &hs, &hl, + p->value, (q - US p->value) + (p->next ? 1 : 0)); + + rh = sig->canon_headers == PDKIM_CANON_RELAXED + ? pdkim_relax_header(p->value, 1) /* cook header for relaxed canon */ + : string_copy(CUS p->value); /* just copy it for simple canon */ + + /* Feed header to the hash algorithm */ + exim_sha_update(&hhash_ctx, CUS rh, Ustrlen(rh)); + + /* Remember headers block for signing (when the library cannot do incremental) */ + (void) exim_rsa_data_append(&hdata, &hdata_alloc, rh); + + DEBUG(D_acl) pdkim_quoteprint(rh, Ustrlen(rh)); + } + + l = sig->sign_headers; + while((s = string_nextinlist(&l, &sep, NULL, 0))) + if (*s != '_') + { /*SSS string_append_listele() */ + if (hl > 0 && headernames[hl-1] != ':') + headernames = string_catn(headernames, &hs, &hl, US":", 1); + + headernames = string_cat(headernames, &hs, &hl, s); + } + headernames[hl] = '\0'; + + /* Copy headernames to signature struct */ + sig->headernames = headernames; + headernames = NULL, hs = hl = 0; + + /* Create signature header with b= omitted */ + sig_hdr = pdkim_create_header(sig, FALSE); } - /* VERIFICATION ----------------------------------------------------------- */ - /* When verifying, walk through the header name list in the h= parameter and - add the headers to the hash in that order. */ - else { - char *b = strdup(sig->headernames); - char *p = b; - char *q = NULL; - pdkim_stringlist *hdrs = ctx->headers; - - if (b == NULL) return PDKIM_ERR_OOM; - - /* clear tags */ - while (hdrs != NULL) { - hdrs->tag = 0; - hdrs = hdrs->next; - } - while(1) { - hdrs = ctx->headers; - q = strchr(p,':'); - if (q != NULL) *q = '\0'; - while (hdrs != NULL) { - if ( (hdrs->tag == 0) && - (strncasecmp(hdrs->value,p,strlen(p)) == 0) && - ((hdrs->value)[strlen(p)] == ':') ) { - char *rh = NULL; - if (sig->canon_headers == PDKIM_CANON_RELAXED) - rh = pdkim_relax_header(hdrs->value,1); /* cook header for relaxed canon */ - else - rh = strdup(hdrs->value); /* just copy it for simple canon */ - if (rh == NULL) return PDKIM_ERR_OOM; - /* Feed header to the hash algorithm */ - if (sig->algo == PDKIM_ALGO_RSA_SHA1) - sha1_update(&(sha1_headers),(unsigned char *)rh,strlen(rh)); - else - sha2_update(&(sha2_headers),(unsigned char *)rh,strlen(rh)); - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - pdkim_quoteprint(ctx->debug_stream, rh, strlen(rh), 1); - #endif - free(rh); - hdrs->tag = 1; - break; - } - hdrs = hdrs->next; - } - if (q == NULL) break; - p = q+1; + /* VERIFICATION ----------------------------------------------------------- */ + /* When verifying, walk through the header name list in the h= parameter and + add the headers to the hash in that order. */ + else + { + uschar * b = string_copy(sig->headernames); + uschar * p = b; + uschar * q; + pdkim_stringlist * hdrs; + + /* clear tags */ + for (hdrs = ctx->headers; hdrs; hdrs = hdrs->next) + hdrs->tag = 0; + + while(1) + { + if ((q = Ustrchr(p, ':'))) + *q = '\0'; + +/*XXX walk the list of headers in same order as received. */ + for (hdrs = ctx->headers; hdrs; hdrs = hdrs->next) + if ( hdrs->tag == 0 + && strncasecmp(hdrs->value, CS p, Ustrlen(p)) == 0 + && (hdrs->value)[Ustrlen(p)] == ':' + ) + { + uschar * rh = sig->canon_headers == PDKIM_CANON_RELAXED + ? pdkim_relax_header(hdrs->value, 1) /* cook header for relaxed canon */ + : string_copy(CUS hdrs->value); /* just copy it for simple canon */ + + /* Feed header to the hash algorithm */ + exim_sha_update(&hhash_ctx, CUS rh, Ustrlen(rh)); + + DEBUG(D_acl) pdkim_quoteprint(rh, Ustrlen(rh)); + hdrs->tag = 1; + break; + } + + if (!q) break; + p = q+1; } - free(b); + + sig_hdr = string_copy(sig->rawsig_no_b_val); } - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) - fprintf(ctx->debug_stream, - "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - #endif + DEBUG(D_acl) debug_printf( + "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - /* SIGNING ---------------------------------------------------------------- */ - if (ctx->mode == PDKIM_MODE_SIGN) { - /* Copy headernames to signature struct */ - sig->headernames = strdup(headernames->str); - pdkim_strfree(headernames); + /* Relax header if necessary */ + if (sig->canon_headers == PDKIM_CANON_RELAXED) + sig_hdr = pdkim_relax_header(sig_hdr, 0); - /* Create signature header with b= omitted */ - sig_hdr = pdkim_create_header(ctx->sig,0); - } - /* VERIFICATION ----------------------------------------------------------- */ - else { - sig_hdr = strdup(sig->rawsig_no_b_val); + DEBUG(D_acl) + { + debug_printf( + "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n"); + pdkim_quoteprint(CUS sig_hdr, Ustrlen(sig_hdr)); + debug_printf( + "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); } - /* ------------------------------------------------------------------------ */ - if (sig_hdr == NULL) return PDKIM_ERR_OOM; + /* Finalize header hash */ + exim_sha_update(&hhash_ctx, CUS sig_hdr, Ustrlen(sig_hdr)); + exim_sha_finish(&hhash_ctx, &hhash); - /* Relax header if necessary */ - if (sig->canon_headers == PDKIM_CANON_RELAXED) { - char *relaxed_hdr = pdkim_relax_header(sig_hdr,0); - free(sig_hdr); - if (relaxed_hdr == NULL) return PDKIM_ERR_OOM; - sig_hdr = relaxed_hdr; + DEBUG(D_acl) + { + debug_printf("PDKIM [%s] hh computed: ", sig->domain); + pdkim_hexprint(hhash.data, hhash.len); } - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, - "PDKIM >> Signed DKIM-Signature header, canonicalized >>>>>>>>>>>>>>>>>\n"); - pdkim_quoteprint(ctx->debug_stream, sig_hdr, strlen(sig_hdr), 1); - fprintf(ctx->debug_stream, - "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - } - #endif - - /* Finalize header hash */ - if (sig->algo == PDKIM_ALGO_RSA_SHA1) { - sha1_update(&(sha1_headers),(unsigned char *)sig_hdr,strlen(sig_hdr)); - sha1_finish(&(sha1_headers),(unsigned char *)headerhash); - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain); - pdkim_hexprint(ctx->debug_stream, headerhash, 20, 1); + /* Remember headers block for signing (when the library cannot do incremental) */ + if (ctx->mode == PDKIM_MODE_SIGN) + (void) exim_rsa_data_append(&hdata, &hdata_alloc, US sig_hdr); + + /* SIGNING ---------------------------------------------------------------- */ + if (ctx->mode == PDKIM_MODE_SIGN) + { + es_ctx sctx; + const uschar * errstr; + + /* Import private key */ + if ((errstr = exim_rsa_signing_init(US sig->rsa_privkey, &sctx))) + { + DEBUG(D_acl) debug_printf("signing_init: %s\n", errstr); + return PDKIM_ERR_RSA_PRIVKEY; } - #endif - } - else { - sha2_update(&(sha2_headers),(unsigned char *)sig_hdr,strlen(sig_hdr)); - sha2_finish(&(sha2_headers),(unsigned char *)headerhash); - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, "PDKIM [%s] hh computed: ", sig->domain); - pdkim_hexprint(ctx->debug_stream, headerhash, 32, 1); + + /* Do signing. With OpenSSL we are signing the hash of headers just + calculated, with GnuTLS we have to sign an entire block of headers + (due to available interfaces) and it recalculates the hash internally. */ + +#if defined(RSA_OPENSSL) || defined(RSA_GCRYPT) + hdata = hhash; +#endif + + if ((errstr = exim_rsa_sign(&sctx, is_sha1, &hdata, &sig->sigdata))) + { + DEBUG(D_acl) debug_printf("signing: %s\n", errstr); + return PDKIM_ERR_RSA_SIGNING; } - #endif + + DEBUG(D_acl) + { + debug_printf( "PDKIM [%s] b computed: ", sig->domain); + pdkim_hexprint(sig->sigdata.data, sig->sigdata.len); + } + + sig->signature_header = pdkim_create_header(sig, TRUE); } - free(sig_hdr); + /* VERIFICATION ----------------------------------------------------------- */ + else + { + ev_ctx vctx; + const uschar * errstr; + + uschar *dns_txt_name, *dns_txt_reply; + + /* Fetch public key for signing domain, from DNS */ - /* SIGNING ---------------------------------------------------------------- */ - if (ctx->mode == PDKIM_MODE_SIGN) { - rsa_context rsa; + dns_txt_name = string_sprintf("%s._domainkey.%s.", + sig->selector, sig->domain); - rsa_init(&rsa,RSA_PKCS_V15,0); + dns_txt_reply = store_get(PDKIM_DNS_TXT_MAX_RECLEN); + memset(dns_txt_reply, 0, PDKIM_DNS_TXT_MAX_RECLEN); - /* Perform private key operation */ - if (rsa_parse_key(&rsa, (unsigned char *)sig->rsa_privkey, - strlen(sig->rsa_privkey), NULL, 0) != 0) { - return PDKIM_ERR_RSA_PRIVKEY; + if ( ctx->dns_txt_callback(CS dns_txt_name, CS dns_txt_reply) != PDKIM_OK + || dns_txt_reply[0] == '\0') + { + sig->verify_status = PDKIM_VERIFY_INVALID; + sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE; + goto NEXT_VERIFY; } - sig->sigdata_len = mpi_size(&(rsa.N)); - sig->sigdata = malloc(sig->sigdata_len); - if (sig->sigdata == NULL) return PDKIM_ERR_OOM; - - if (rsa_pkcs1_sign( &rsa, RSA_PRIVATE, - ((sig->algo == PDKIM_ALGO_RSA_SHA1)? - SIG_RSA_SHA1:SIG_RSA_SHA256), - 0, - (unsigned char *)headerhash, - (unsigned char *)sig->sigdata ) != 0) { - return PDKIM_ERR_RSA_SIGNING; + DEBUG(D_acl) + { + debug_printf( + "PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n" + " Raw record: "); + pdkim_quoteprint(CUS dns_txt_reply, Ustrlen(dns_txt_reply)); } - rsa_free(&rsa); + if (!(sig->pubkey = pdkim_parse_pubkey_record(ctx, CUS dns_txt_reply))) + { + sig->verify_status = PDKIM_VERIFY_INVALID; + sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD; - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, "PDKIM [%s] b computed: ", - sig->domain); - pdkim_hexprint(ctx->debug_stream, sig->sigdata, sig->sigdata_len, 1); + DEBUG(D_acl) debug_printf( + " Error while parsing public key record\n" + "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); + goto NEXT_VERIFY; } - #endif - sig->signature_header = pdkim_create_header(ctx->sig,1); - if (sig->signature_header == NULL) return PDKIM_ERR_OOM; - } - /* VERIFICATION ----------------------------------------------------------- */ - else { - rsa_context rsa; - char *dns_txt_name, *dns_txt_reply; - - rsa_init(&rsa,RSA_PKCS_V15,0); - - dns_txt_name = malloc(PDKIM_DNS_TXT_MAX_NAMELEN); - if (dns_txt_name == NULL) return PDKIM_ERR_OOM; - dns_txt_reply = malloc(PDKIM_DNS_TXT_MAX_RECLEN); - if (dns_txt_reply == NULL) { - free(dns_txt_name); - return PDKIM_ERR_OOM; - } - memset(dns_txt_reply,0,PDKIM_DNS_TXT_MAX_RECLEN); - memset(dns_txt_name ,0,PDKIM_DNS_TXT_MAX_NAMELEN); - - if (snprintf(dns_txt_name,PDKIM_DNS_TXT_MAX_NAMELEN, - "%s._domainkey.%s.", - sig->selector,sig->domain) >= PDKIM_DNS_TXT_MAX_NAMELEN) { - sig->verify_status = PDKIM_VERIFY_INVALID; - sig->verify_ext_status = PDKIM_VERIFY_INVALID_BUFFER_SIZE; - goto NEXT_VERIFY; - } + DEBUG(D_acl) debug_printf( + "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - if ((ctx->dns_txt_callback(dns_txt_name, dns_txt_reply) != PDKIM_OK) || - (dns_txt_reply[0] == '\0')) { - sig->verify_status = PDKIM_VERIFY_INVALID; - sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE; - goto NEXT_VERIFY; + /* Import public key */ + if ((errstr = exim_rsa_verify_init(&sig->pubkey->key, &vctx))) + { + DEBUG(D_acl) debug_printf("verify_init: %s\n", errstr); + sig->verify_status = PDKIM_VERIFY_INVALID; + sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_IMPORT; + goto NEXT_VERIFY; } - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, - "PDKIM >> Parsing public key record >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); - fprintf(ctx->debug_stream," Raw record: "); - pdkim_quoteprint(ctx->debug_stream, dns_txt_reply, strlen(dns_txt_reply), 1); - } - #endif - - sig->pubkey = pdkim_parse_pubkey_record(ctx,dns_txt_reply); - if (sig->pubkey == NULL) { - sig->verify_status = PDKIM_VERIFY_INVALID; - sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING; - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream," Error while parsing public key record\n"); - fprintf(ctx->debug_stream, - "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - } - #endif - goto NEXT_VERIFY; + /* Check the signature */ + if ((errstr = exim_rsa_verify(&vctx, is_sha1, &hhash, &sig->sigdata))) + { + DEBUG(D_acl) debug_printf("headers verify: %s\n", errstr); + sig->verify_status = PDKIM_VERIFY_FAIL; + sig->verify_ext_status = PDKIM_VERIFY_FAIL_MESSAGE; + goto NEXT_VERIFY; } - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, - "PDKIM <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n"); - } - #endif - - if (rsa_parse_public_key(&rsa, - (unsigned char *)sig->pubkey->key, - sig->pubkey->key_len) != 0) { - sig->verify_status = PDKIM_VERIFY_INVALID; - sig->verify_ext_status = PDKIM_VERIFY_INVALID_PUBKEY_PARSING; - goto NEXT_VERIFY; - } - /* Check the signature */ - if (rsa_pkcs1_verify(&rsa, - RSA_PUBLIC, - ((sig->algo == PDKIM_ALGO_RSA_SHA1)? - SIG_RSA_SHA1:SIG_RSA_SHA256), - 0, - (unsigned char *)headerhash, - (unsigned char *)sig->sigdata) != 0) { - sig->verify_status = PDKIM_VERIFY_FAIL; - sig->verify_ext_status = PDKIM_VERIFY_FAIL_MESSAGE; - goto NEXT_VERIFY; - } + /* We have a winner! (if bodydhash was correct earlier) */ + if (sig->verify_status == PDKIM_VERIFY_NONE) + sig->verify_status = PDKIM_VERIFY_PASS; - /* We have a winner! (if bodydhash was correct earlier) */ - if (sig->verify_status == PDKIM_VERIFY_NONE) { - sig->verify_status = PDKIM_VERIFY_PASS; - } +NEXT_VERIFY: - NEXT_VERIFY: - - #ifdef PDKIM_DEBUG - if (ctx->debug_stream) { - fprintf(ctx->debug_stream, "PDKIM [%s] signature status: %s", - sig->domain, pdkim_verify_status_str(sig->verify_status)); - if (sig->verify_ext_status > 0) { - fprintf(ctx->debug_stream, " (%s)\n", - pdkim_verify_ext_status_str(sig->verify_ext_status)); - } - else { - fprintf(ctx->debug_stream, "\n"); - } + DEBUG(D_acl) + { + debug_printf("PDKIM [%s] signature status: %s", + sig->domain, pdkim_verify_status_str(sig->verify_status)); + if (sig->verify_ext_status > 0) + debug_printf(" (%s)\n", + pdkim_verify_ext_status_str(sig->verify_ext_status)); + else + debug_printf("\n"); } - #endif - - rsa_free(&rsa); - free(dns_txt_name); - free(dns_txt_reply); } - sig = sig->next; + sig = sig->next; } - /* If requested, set return pointer to signature(s) */ - if (return_signatures != NULL) { - *return_signatures = ctx->sig; - } +/* If requested, set return pointer to signature(s) */ +if (return_signatures) + *return_signatures = ctx->sig; - return PDKIM_OK; +return PDKIM_OK; } /* -------------------------------------------------------------------------- */ -DLLEXPORT pdkim_ctx *pdkim_init_verify(int input_mode, - int(*dns_txt_callback)(char *, char *) - ) { - pdkim_ctx *ctx = malloc(sizeof(pdkim_ctx)); - if (ctx == NULL) return NULL; - memset(ctx,0,sizeof(pdkim_ctx)); - - ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN); - if (ctx->linebuf == NULL) { - free(ctx); - return NULL; - } - ctx->mode = PDKIM_MODE_VERIFY; - ctx->input_mode = input_mode; - ctx->dns_txt_callback = dns_txt_callback; +DLLEXPORT pdkim_ctx * +pdkim_init_verify(int(*dns_txt_callback)(char *, char *)) +{ +pdkim_ctx * ctx; + +ctx = store_get(sizeof(pdkim_ctx)); +memset(ctx, 0, sizeof(pdkim_ctx)); - return ctx; +ctx->linebuf = store_get(PDKIM_MAX_BODY_LINE_LEN); +ctx->mode = PDKIM_MODE_VERIFY; +ctx->dns_txt_callback = dns_txt_callback; + +return ctx; } /* -------------------------------------------------------------------------- */ -DLLEXPORT pdkim_ctx *pdkim_init_sign(int input_mode, - char *domain, - char *selector, - char *rsa_privkey) { - pdkim_ctx *ctx; - pdkim_signature *sig; - if (!domain || !selector || !rsa_privkey) return NULL; +DLLEXPORT pdkim_ctx * +pdkim_init_sign(char *domain, char *selector, char *rsa_privkey, int algo) +{ +pdkim_ctx *ctx; +pdkim_signature *sig; - ctx = malloc(sizeof(pdkim_ctx)); - if (ctx == NULL) return NULL; - memset(ctx,0,sizeof(pdkim_ctx)); +if (!domain || !selector || !rsa_privkey) + return NULL; - ctx->linebuf = malloc(PDKIM_MAX_BODY_LINE_LEN); - if (ctx->linebuf == NULL) { - free(ctx); - return NULL; - } +ctx = store_get(sizeof(pdkim_ctx)); +memset(ctx, 0, sizeof(pdkim_ctx)); - sig = malloc(sizeof(pdkim_signature)); - if (sig == NULL) { - free(ctx->linebuf); - free(ctx); - return NULL; - } - memset(sig,0,sizeof(pdkim_signature)); - sig->bodylength = -1; +ctx->linebuf = store_get(PDKIM_MAX_BODY_LINE_LEN); - ctx->mode = PDKIM_MODE_SIGN; - ctx->input_mode = input_mode; - ctx->sig = sig; +sig = store_get(sizeof(pdkim_signature)); +memset(sig, 0, sizeof(pdkim_signature)); - ctx->sig->domain = strdup(domain); - ctx->sig->selector = strdup(selector); - ctx->sig->rsa_privkey = strdup(rsa_privkey); +sig->bodylength = -1; - if (!ctx->sig->domain || !ctx->sig->selector || !ctx->sig->rsa_privkey) { - pdkim_free_ctx(ctx); - return NULL; - } +ctx->mode = PDKIM_MODE_SIGN; +ctx->sig = sig; - ctx->sig->sha1_body = malloc(sizeof(sha1_context)); - if (ctx->sig->sha1_body == NULL) { - pdkim_free_ctx(ctx); - return NULL; - } - sha1_starts(ctx->sig->sha1_body); +sig->domain = string_copy(US domain); +sig->selector = string_copy(US selector); +sig->rsa_privkey = string_copy(US rsa_privkey); +sig->algo = algo; - ctx->sig->sha2_body = malloc(sizeof(sha2_context)); - if (ctx->sig->sha2_body == NULL) { - pdkim_free_ctx(ctx); - return NULL; - } - sha2_starts(ctx->sig->sha2_body,0); - - return ctx; +exim_sha_init(&sig->body_hash, algo == PDKIM_ALGO_RSA_SHA1 ? HASH_SHA1 : HASH_SHA256); +return ctx; } -#ifdef PDKIM_DEBUG -/* -------------------------------------------------------------------------- */ -DLLEXPORT void pdkim_set_debug_stream(pdkim_ctx *ctx, - FILE *debug_stream) { - ctx->debug_stream = debug_stream; -} -#endif /* -------------------------------------------------------------------------- */ -DLLEXPORT int pdkim_set_optional(pdkim_ctx *ctx, + +DLLEXPORT int +pdkim_set_optional(pdkim_ctx *ctx, char *sign_headers, char *identity, int canon_headers, int canon_body, long bodylength, - int algo, unsigned long created, - unsigned long expires) { + unsigned long expires) +{ +pdkim_signature * sig = ctx->sig; - if (identity != NULL) { - ctx->sig->identity = strdup(identity); - if (ctx->sig->identity == NULL) return PDKIM_ERR_OOM; - } +if (identity) + sig->identity = string_copy(US identity); - if (sign_headers != NULL) { - ctx->sig->sign_headers = strdup(sign_headers); - if (ctx->sig->sign_headers == NULL) return PDKIM_ERR_OOM; - } +sig->sign_headers = string_copy(sign_headers + ? US sign_headers : US PDKIM_DEFAULT_SIGN_HEADERS); - ctx->sig->canon_headers = canon_headers; - ctx->sig->canon_body = canon_body; - ctx->sig->bodylength = bodylength; - ctx->sig->algo = algo; - ctx->sig->created = created; - ctx->sig->expires = expires; +sig->canon_headers = canon_headers; +sig->canon_body = canon_body; +sig->bodylength = bodylength; +sig->created = created; +sig->expires = expires; - return PDKIM_OK; +return PDKIM_OK; +} + + +void +pdkim_init(void) +{ +exim_rsa_init(); } + + + +#endif /*DISABLE_DKIM*/