* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
- * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
- * $Id$
***************************************************************************/
-#include "setup.h"
+
+#include "curl_setup.h"
#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_CRYPTO_AUTH)
-/* -- WIN32 approved -- */
-#include <stdio.h>
-#include <string.h>
-#include <stdarg.h>
-#include <stdlib.h>
-#include <ctype.h>
#include "urldata.h"
-#include "sendf.h"
-#include "strequal.h"
-#include "base64.h"
-#include "md5.h"
+#include "rawstr.h"
+#include "curl_base64.h"
+#include "curl_md5.h"
#include "http_digest.h"
#include "strtok.h"
-#include "url.h" /* for Curl_safefree() */
-#include "memory.h"
-#include "easyif.h" /* included for Curl_convert_... prototypes */
+#include "curl_memory.h"
+#include "vtls/vtls.h" /* for Curl_rand() */
+#include "non-ascii.h" /* included for Curl_convert_... prototypes */
+#include "warnless.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
+#define MAX_VALUE_LENGTH 256
+#define MAX_CONTENT_LENGTH 1024
+
+static void digest_cleanup_one(struct digestdata *dig);
+
+/*
+ * Return 0 on success and then the buffers are filled in fine.
+ *
+ * Non-zero means failure to parse.
+ */
+static int get_pair(const char *str, char *value, char *content,
+ const char **endptr)
+{
+ int c;
+ bool starts_with_quote = FALSE;
+ bool escape = FALSE;
+
+ for(c=MAX_VALUE_LENGTH-1; (*str && (*str != '=') && c--); )
+ *value++ = *str++;
+ *value=0;
+
+ if('=' != *str++)
+ /* eek, no match */
+ return 1;
+
+ if('\"' == *str) {
+ /* this starts with a quote so it must end with one as well! */
+ str++;
+ starts_with_quote = TRUE;
+ }
+
+ for(c=MAX_CONTENT_LENGTH-1; *str && c--; str++) {
+ switch(*str) {
+ case '\\':
+ if(!escape) {
+ /* possibly the start of an escaped quote */
+ escape = TRUE;
+ *content++ = '\\'; /* even though this is an escape character, we still
+ store it as-is in the target buffer */
+ continue;
+ }
+ break;
+ case ',':
+ if(!starts_with_quote) {
+ /* this signals the end of the content if we didn't get a starting
+ quote and then we do "sloppy" parsing */
+ c=0; /* the end */
+ continue;
+ }
+ break;
+ case '\r':
+ case '\n':
+ /* end of string */
+ c=0;
+ continue;
+ case '\"':
+ if(!escape && starts_with_quote) {
+ /* end of string */
+ c=0;
+ continue;
+ }
+ break;
+ }
+ escape = FALSE;
+ *content++ = *str;
+ }
+ *content=0;
+
+ *endptr = str;
+
+ return 0; /* all is fine! */
+}
+
/* Test example headers:
WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
const char *header) /* rest of the *-authenticate:
header */
{
- bool more = TRUE;
char *token = NULL;
char *tmp = NULL;
bool foundAuth = FALSE;
d = &data->state.digest;
}
- /* skip initial whitespaces */
- while(*header && ISSPACE(*header))
- header++;
-
if(checkprefix("Digest", header)) {
header += strlen("Digest");
before = TRUE;
/* clear off any former leftovers and init to defaults */
- Curl_digest_cleanup_one(d);
+ digest_cleanup_one(d);
- while(more) {
- char value[32];
- char content[128];
- size_t totlen=0;
+ for(;;) {
+ char value[MAX_VALUE_LENGTH];
+ char content[MAX_CONTENT_LENGTH];
while(*header && ISSPACE(*header))
header++;
- /* how big can these strings be? */
- if((2 == sscanf(header, "%31[^=]=\"%127[^\"]\"",
- value, content)) ||
- /* try the same scan but without quotes around the content but don't
- include the possibly trailing comma, newline or carriage return */
- (2 == sscanf(header, "%31[^=]=%127[^\r\n,]",
- value, content)) ) {
- if(strequal(value, "nonce")) {
+ /* extract a value=content pair */
+ if(!get_pair(header, value, content, &header)) {
+ if(Curl_raw_equal(value, "nonce")) {
d->nonce = strdup(content);
if(!d->nonce)
return CURLDIGEST_NOMEM;
}
- else if(strequal(value, "stale")) {
- if(strequal(content, "true")) {
+ else if(Curl_raw_equal(value, "stale")) {
+ if(Curl_raw_equal(content, "true")) {
d->stale = TRUE;
d->nc = 1; /* we make a new nonce now */
}
}
- else if(strequal(value, "realm")) {
+ else if(Curl_raw_equal(value, "realm")) {
d->realm = strdup(content);
if(!d->realm)
return CURLDIGEST_NOMEM;
}
- else if(strequal(value, "opaque")) {
+ else if(Curl_raw_equal(value, "opaque")) {
d->opaque = strdup(content);
if(!d->opaque)
return CURLDIGEST_NOMEM;
}
- else if(strequal(value, "qop")) {
+ else if(Curl_raw_equal(value, "qop")) {
char *tok_buf;
/* tokenize the list and choose auth if possible, use a temporary
clone of the buffer since strtok_r() ruins it */
return CURLDIGEST_NOMEM;
token = strtok_r(tmp, ",", &tok_buf);
while(token != NULL) {
- if(strequal(token, "auth")) {
+ if(Curl_raw_equal(token, "auth")) {
foundAuth = TRUE;
}
- else if(strequal(token, "auth-int")) {
+ else if(Curl_raw_equal(token, "auth-int")) {
foundAuthInt = TRUE;
}
token = strtok_r(NULL, ",", &tok_buf);
return CURLDIGEST_NOMEM;
}
}
- else if(strequal(value, "algorithm")) {
+ else if(Curl_raw_equal(value, "algorithm")) {
d->algorithm = strdup(content);
if(!d->algorithm)
return CURLDIGEST_NOMEM;
- if(strequal(content, "MD5-sess"))
+ if(Curl_raw_equal(content, "MD5-sess"))
d->algo = CURLDIGESTALGO_MD5SESS;
- else if(strequal(content, "MD5"))
+ else if(Curl_raw_equal(content, "MD5"))
d->algo = CURLDIGESTALGO_MD5;
else
return CURLDIGEST_BADALGO;
else {
/* unknown specifier, ignore it! */
}
- totlen = strlen(value)+strlen(content)+1;
-
- if(header[strlen(value)+1] == '\"')
- /* the contents were within quotes, then add 2 for them to the
- length */
- totlen += 2;
}
else
break; /* we're done here */
- header += totlen;
+ /* pass all additional spaces here */
+ while(*header && ISSPACE(*header))
+ header++;
if(',' == *header)
/* allow the list to be comma-separated */
header++;
snprintf((char *)&dest[i*2], 3, "%02x", source[i]);
}
+/* Perform quoted-string escaping as described in RFC2616 and its errata */
+static char *string_quoted(const char *source)
+{
+ char *dest, *d;
+ const char *s = source;
+ size_t n = 1; /* null terminator */
+
+ /* Calculate size needed */
+ while(*s) {
+ ++n;
+ if(*s == '"' || *s == '\\') {
+ ++n;
+ }
+ ++s;
+ }
+
+ dest = malloc(n);
+ if(dest) {
+ s = source;
+ d = dest;
+ while(*s) {
+ if(*s == '"' || *s == '\\') {
+ *d++ = '\\';
+ }
+ *d++ = *s++;
+ }
+ *d = 0;
+ }
+
+ return dest;
+}
+
CURLcode Curl_output_digest(struct connectdata *conn,
bool proxy,
const unsigned char *request,
/* We have a Digest setup for this, use it! Now, to get all the details for
this sorted out, I must urge you dear friend to read up on the RFC2617
section 3.2.2, */
+ size_t urilen;
unsigned char md5buf[16]; /* 16 bytes/128 bits */
unsigned char request_digest[33];
unsigned char *md5this;
- unsigned char *ha1;
+ unsigned char ha1[33];/* 32 digits and 1 zero byte */
unsigned char ha2[33];/* 32 digits and 1 zero byte */
- char cnoncebuf[7];
- char *cnonce;
+ char cnoncebuf[33];
+ char *cnonce = NULL;
+ size_t cnonce_sz = 0;
char *tmp = NULL;
- struct timeval now;
-
char **allocuserpwd;
- char *userp;
- char *passwdp;
+ size_t userlen;
+ const char *userp;
+ char *userp_quoted;
+ const char *passwdp;
struct auth *authp;
struct SessionHandle *data = conn->data;
struct digestdata *d;
-#ifdef CURL_DOES_CONVERSIONS
CURLcode rc;
/* The CURL_OUTPUT_DIGEST_CONV macro below is for non-ASCII machines.
- It converts digest text to ASCII so the MD5 will be correct for
+ It converts digest text to ASCII so the MD5 will be correct for
what ultimately goes over the network.
*/
#define CURL_OUTPUT_DIGEST_CONV(a, b) \
free(b); \
return rc; \
}
-#else
-#define CURL_OUTPUT_DIGEST_CONV(a, b)
-#endif /* CURL_DOES_CONVERSIONS */
if(proxy) {
d = &data->state.proxydigest;
authp = &data->state.authhost;
}
- if(*allocuserpwd) {
- Curl_safefree(*allocuserpwd);
- *allocuserpwd = NULL;
- }
+ Curl_safefree(*allocuserpwd);
/* not set means empty */
if(!userp)
- userp=(char *)"";
+ userp="";
if(!passwdp)
- passwdp=(char *)"";
+ passwdp="";
if(!d->nonce) {
authp->done = FALSE;
d->nc = 1;
if(!d->cnonce) {
- /* Generate a cnonce */
- now = Curl_tvnow();
- snprintf(cnoncebuf, sizeof(cnoncebuf), "%06ld", now.tv_sec);
- if(Curl_base64_encode(data, cnoncebuf, strlen(cnoncebuf), &cnonce))
- d->cnonce = cnonce;
- else
- return CURLE_OUT_OF_MEMORY;
+ snprintf(cnoncebuf, sizeof(cnoncebuf), "%08x%08x%08x%08x",
+ Curl_rand(data), Curl_rand(data),
+ Curl_rand(data), Curl_rand(data));
+ rc = Curl_base64_encode(data, cnoncebuf, strlen(cnoncebuf),
+ &cnonce, &cnonce_sz);
+ if(rc)
+ return rc;
+ d->cnonce = cnonce;
}
/*
CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
Curl_md5it(md5buf, md5this);
- free(md5this); /* free this again */
-
- ha1 = (unsigned char *)malloc(33); /* 32 digits and 1 zero byte */
- if(!ha1)
- return CURLE_OUT_OF_MEMORY;
-
+ Curl_safefree(md5this);
md5_to_ascii(md5buf, ha1);
if(d->algo == CURLDIGESTALGO_MD5SESS) {
return CURLE_OUT_OF_MEMORY;
CURL_OUTPUT_DIGEST_CONV(data, tmp); /* convert on non-ASCII machines */
Curl_md5it(md5buf, (unsigned char *)tmp);
- free(tmp); /* free this again */
+ Curl_safefree(tmp);
md5_to_ascii(md5buf, ha1);
}
5.1.1 of RFC 2616)
*/
- md5this = (unsigned char *)aprintf("%s:%s", request, uripath);
- if(!md5this) {
- free(ha1);
- return CURLE_OUT_OF_MEMORY;
- }
+ /* So IE browsers < v7 cut off the URI part at the query part when they
+ evaluate the MD5 and some (IIS?) servers work with them so we may need to
+ do the Digest IE-style. Note that the different ways cause different MD5
+ sums to get sent.
+
+ Apache servers can be set to do the Digest IE-style automatically using
+ the BrowserMatch feature:
+ http://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html#msie
- if(d->qop && strequal(d->qop, "auth-int")) {
- /* We don't support auth-int at the moment. I can't see a easy way to get
- entity-body here */
- /* TODO: Append H(entity-body)*/
+ Further details on Digest implementation differences:
+ http://www.fngtps.com/2006/09/http-authentication
+ */
+
+ if(authp->iestyle && ((tmp = strchr((char *)uripath, '?')) != NULL))
+ urilen = tmp - (char *)uripath;
+ else
+ urilen = strlen((char *)uripath);
+
+ md5this = (unsigned char *)aprintf("%s:%.*s", request, urilen, uripath);
+
+ if(d->qop && Curl_raw_equal(d->qop, "auth-int")) {
+ /* We don't support auth-int for PUT or POST at the moment.
+ TODO: replace md5 of empty string with entity-body for PUT/POST */
+ unsigned char *md5this2 = (unsigned char *)
+ aprintf("%s:%s", md5this, "d41d8cd98f00b204e9800998ecf8427e");
+ Curl_safefree(md5this);
+ md5this = md5this2;
}
+
+ if(!md5this)
+ return CURLE_OUT_OF_MEMORY;
+
CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
Curl_md5it(md5buf, md5this);
- free(md5this); /* free this again */
+ Curl_safefree(md5this);
md5_to_ascii(md5buf, ha2);
if(d->qop) {
d->nonce,
ha2);
}
- free(ha1);
if(!md5this)
return CURLE_OUT_OF_MEMORY;
CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
Curl_md5it(md5buf, md5this);
- free(md5this); /* free this again */
+ Curl_safefree(md5this);
md5_to_ascii(md5buf, request_digest);
/* for test case 64 (snooped from a Mozilla 1.3a request)
Authorization: Digest username="testuser", realm="testrealm", \
nonce="1053604145", uri="/64", response="c55f7f30d83d774a3d2dcacf725abaca"
+
+ Digest parameters are all quoted strings. Username which is provided by
+ the user will need double quotes and backslashes within it escaped. For
+ the other fields, this shouldn't be an issue. realm, nonce, and opaque
+ are copied as is from the server, escapes and all. cnonce is generated
+ with web-safe characters. uri is already percent encoded. nc is 8 hex
+ characters. algorithm and qop with standard values only contain web-safe
+ chracters.
*/
+ userp_quoted = string_quoted(userp);
+ if(!userp_quoted)
+ return CURLE_OUT_OF_MEMORY;
if(d->qop) {
*allocuserpwd =
"username=\"%s\", "
"realm=\"%s\", "
"nonce=\"%s\", "
- "uri=\"%s\", "
+ "uri=\"%.*s\", "
"cnonce=\"%s\", "
"nc=%08x, "
- "qop=\"%s\", "
+ "qop=%s, "
"response=\"%s\"",
proxy?"Proxy-":"",
- userp,
+ userp_quoted,
d->realm,
d->nonce,
- uripath, /* this is the PATH part of the URL */
+ urilen, uripath, /* this is the PATH part of the URL */
d->cnonce,
d->nc,
d->qop,
request_digest);
- if(strequal(d->qop, "auth"))
+ if(Curl_raw_equal(d->qop, "auth"))
d->nc++; /* The nc (from RFC) has to be a 8 hex digit number 0 padded
which tells to the server how many times you are using the
same nonce in the qop=auth mode. */
"username=\"%s\", "
"realm=\"%s\", "
"nonce=\"%s\", "
- "uri=\"%s\", "
+ "uri=\"%.*s\", "
"response=\"%s\"",
proxy?"Proxy-":"",
- userp,
+ userp_quoted,
d->realm,
d->nonce,
- uripath, /* this is the PATH part of the URL */
+ urilen, uripath, /* this is the PATH part of the URL */
request_digest);
}
+ Curl_safefree(userp_quoted);
if(!*allocuserpwd)
return CURLE_OUT_OF_MEMORY;
*allocuserpwd = tmp;
}
- /* append CRLF to the userpwd header */
- tmp = (char*) realloc(*allocuserpwd, strlen(*allocuserpwd) + 3 + 1);
+ /* append CRLF + zero (3 bytes) to the userpwd header */
+ userlen = strlen(*allocuserpwd);
+ tmp = realloc(*allocuserpwd, userlen + 3);
if(!tmp)
return CURLE_OUT_OF_MEMORY;
- strcat(tmp, "\r\n");
+ strcpy(&tmp[userlen], "\r\n"); /* append the data */
*allocuserpwd = tmp;
return CURLE_OK;
}
-void Curl_digest_cleanup_one(struct digestdata *d)
+static void digest_cleanup_one(struct digestdata *d)
{
- if(d->nonce)
- free(d->nonce);
- d->nonce = NULL;
-
- if(d->cnonce)
- free(d->cnonce);
- d->cnonce = NULL;
-
- if(d->realm)
- free(d->realm);
- d->realm = NULL;
-
- if(d->opaque)
- free(d->opaque);
- d->opaque = NULL;
-
- if(d->qop)
- free(d->qop);
- d->qop = NULL;
-
- if(d->algorithm)
- free(d->algorithm);
- d->algorithm = NULL;
+ Curl_safefree(d->nonce);
+ Curl_safefree(d->cnonce);
+ Curl_safefree(d->realm);
+ Curl_safefree(d->opaque);
+ Curl_safefree(d->qop);
+ Curl_safefree(d->algorithm);
d->nc = 0;
d->algo = CURLDIGESTALGO_MD5; /* default algorithm */
void Curl_digest_cleanup(struct SessionHandle *data)
{
- Curl_digest_cleanup_one(&data->state.digest);
- Curl_digest_cleanup_one(&data->state.proxydigest);
+ digest_cleanup_one(&data->state.digest);
+ digest_cleanup_one(&data->state.proxydigest);
}
#endif
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