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-rw-r--r--lib/http_digest.c583
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diff --git a/lib/http_digest.c b/lib/http_digest.c
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+++ b/lib/http_digest.c
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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2012, 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
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "setup.h"
+
+#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_CRYPTO_AUTH)
+
+#include "urldata.h"
+#include "sendf.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 "curl_memory.h"
+#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"
+Proxy-Authenticate: Digest realm="testrealm", nonce="1053604598"
+
+*/
+
+CURLdigest Curl_input_digest(struct connectdata *conn,
+ bool proxy,
+ const char *header) /* rest of the *-authenticate:
+ header */
+{
+ char *token = NULL;
+ char *tmp = NULL;
+ bool foundAuth = FALSE;
+ bool foundAuthInt = FALSE;
+ struct SessionHandle *data=conn->data;
+ bool before = FALSE; /* got a nonce before */
+ struct digestdata *d;
+
+ if(proxy) {
+ d = &data->state.proxydigest;
+ }
+ else {
+ d = &data->state.digest;
+ }
+
+ /* skip initial whitespaces */
+ while(*header && ISSPACE(*header))
+ header++;
+
+ if(checkprefix("Digest", header)) {
+ header += strlen("Digest");
+
+ /* If we already have received a nonce, keep that in mind */
+ if(d->nonce)
+ before = TRUE;
+
+ /* clear off any former leftovers and init to defaults */
+ digest_cleanup_one(d);
+
+ for(;;) {
+ char value[MAX_VALUE_LENGTH];
+ char content[MAX_CONTENT_LENGTH];
+
+ while(*header && ISSPACE(*header))
+ header++;
+
+ /* 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(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(Curl_raw_equal(value, "realm")) {
+ d->realm = strdup(content);
+ if(!d->realm)
+ return CURLDIGEST_NOMEM;
+ }
+ else if(Curl_raw_equal(value, "opaque")) {
+ d->opaque = strdup(content);
+ if(!d->opaque)
+ return CURLDIGEST_NOMEM;
+ }
+ 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 */
+ tmp = strdup(content);
+ if(!tmp)
+ return CURLDIGEST_NOMEM;
+ token = strtok_r(tmp, ",", &tok_buf);
+ while(token != NULL) {
+ if(Curl_raw_equal(token, "auth")) {
+ foundAuth = TRUE;
+ }
+ else if(Curl_raw_equal(token, "auth-int")) {
+ foundAuthInt = TRUE;
+ }
+ token = strtok_r(NULL, ",", &tok_buf);
+ }
+ free(tmp);
+ /*select only auth o auth-int. Otherwise, ignore*/
+ if(foundAuth) {
+ d->qop = strdup("auth");
+ if(!d->qop)
+ return CURLDIGEST_NOMEM;
+ }
+ else if(foundAuthInt) {
+ d->qop = strdup("auth-int");
+ if(!d->qop)
+ return CURLDIGEST_NOMEM;
+ }
+ }
+ else if(Curl_raw_equal(value, "algorithm")) {
+ d->algorithm = strdup(content);
+ if(!d->algorithm)
+ return CURLDIGEST_NOMEM;
+ if(Curl_raw_equal(content, "MD5-sess"))
+ d->algo = CURLDIGESTALGO_MD5SESS;
+ else if(Curl_raw_equal(content, "MD5"))
+ d->algo = CURLDIGESTALGO_MD5;
+ else
+ return CURLDIGEST_BADALGO;
+ }
+ else {
+ /* unknown specifier, ignore it! */
+ }
+ }
+ else
+ break; /* we're done here */
+
+ /* pass all additional spaces here */
+ while(*header && ISSPACE(*header))
+ header++;
+ if(',' == *header)
+ /* allow the list to be comma-separated */
+ header++;
+ }
+ /* We had a nonce since before, and we got another one now without
+ 'stale=true'. This means we provided bad credentials in the previous
+ request */
+ if(before && !d->stale)
+ return CURLDIGEST_BAD;
+
+ /* We got this header without a nonce, that's a bad Digest line! */
+ if(!d->nonce)
+ return CURLDIGEST_BAD;
+ }
+ else
+ /* else not a digest, get out */
+ return CURLDIGEST_NONE;
+
+ return CURLDIGEST_FINE;
+}
+
+/* convert md5 chunk to RFC2617 (section 3.1.3) -suitable ascii string*/
+static void md5_to_ascii(unsigned char *source, /* 16 bytes */
+ unsigned char *dest) /* 33 bytes */
+{
+ int i;
+ for(i=0; i<16; i++)
+ snprintf((char *)&dest[i*2], 3, "%02x", source[i]);
+}
+
+CURLcode Curl_output_digest(struct connectdata *conn,
+ bool proxy,
+ const unsigned char *request,
+ const unsigned char *uripath)
+{
+ /* 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, */
+ unsigned char md5buf[16]; /* 16 bytes/128 bits */
+ unsigned char request_digest[33];
+ unsigned char *md5this;
+ unsigned char *ha1;
+ unsigned char ha2[33];/* 32 digits and 1 zero byte */
+ char cnoncebuf[33];
+ char *cnonce = NULL;
+ size_t cnonce_sz = 0;
+ char *tmp = NULL;
+ struct timeval now;
+
+ char **allocuserpwd;
+ const char *userp;
+ const char *passwdp;
+ struct auth *authp;
+
+ struct SessionHandle *data = conn->data;
+ struct digestdata *d;
+ 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
+ what ultimately goes over the network.
+*/
+#define CURL_OUTPUT_DIGEST_CONV(a, b) \
+ rc = Curl_convert_to_network(a, (char *)b, strlen((const char*)b)); \
+ if(rc != CURLE_OK) { \
+ free(b); \
+ return rc; \
+ }
+
+ if(proxy) {
+ d = &data->state.proxydigest;
+ allocuserpwd = &conn->allocptr.proxyuserpwd;
+ userp = conn->proxyuser;
+ passwdp = conn->proxypasswd;
+ authp = &data->state.authproxy;
+ }
+ else {
+ d = &data->state.digest;
+ allocuserpwd = &conn->allocptr.userpwd;
+ userp = conn->user;
+ passwdp = conn->passwd;
+ authp = &data->state.authhost;
+ }
+
+ if(*allocuserpwd) {
+ Curl_safefree(*allocuserpwd);
+ *allocuserpwd = NULL;
+ }
+
+ /* not set means empty */
+ if(!userp)
+ userp="";
+
+ if(!passwdp)
+ passwdp="";
+
+ if(!d->nonce) {
+ authp->done = FALSE;
+ return CURLE_OK;
+ }
+ authp->done = TRUE;
+
+ if(!d->nc)
+ d->nc = 1;
+
+ if(!d->cnonce) {
+ /* Generate a cnonce */
+ now = Curl_tvnow();
+ snprintf(cnoncebuf, sizeof(cnoncebuf), "%32ld",
+ (long)now.tv_sec + now.tv_usec);
+
+ rc = Curl_base64_encode(data, cnoncebuf, strlen(cnoncebuf),
+ &cnonce, &cnonce_sz);
+ if(rc)
+ return rc;
+ d->cnonce = cnonce;
+ }
+
+ /*
+ if the algorithm is "MD5" or unspecified (which then defaults to MD5):
+
+ A1 = unq(username-value) ":" unq(realm-value) ":" passwd
+
+ if the algorithm is "MD5-sess" then:
+
+ A1 = H( unq(username-value) ":" unq(realm-value) ":" passwd )
+ ":" unq(nonce-value) ":" unq(cnonce-value)
+ */
+
+ md5this = (unsigned char *)
+ aprintf("%s:%s:%s", userp, d->realm, passwdp);
+ 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 */
+
+ ha1 = malloc(33); /* 32 digits and 1 zero byte */
+ if(!ha1)
+ return CURLE_OUT_OF_MEMORY;
+
+ md5_to_ascii(md5buf, ha1);
+
+ if(d->algo == CURLDIGESTALGO_MD5SESS) {
+ /* nonce and cnonce are OUTSIDE the hash */
+ tmp = aprintf("%s:%s:%s", ha1, d->nonce, d->cnonce);
+ if(!tmp)
+ 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 */
+ md5_to_ascii(md5buf, ha1);
+ }
+
+ /*
+ If the "qop" directive's value is "auth" or is unspecified, then A2 is:
+
+ A2 = Method ":" digest-uri-value
+
+ If the "qop" value is "auth-int", then A2 is:
+
+ A2 = Method ":" digest-uri-value ":" H(entity-body)
+
+ (The "Method" value is the HTTP request method as specified in section
+ 5.1.1 of RFC 2616)
+ */
+
+ /* 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
+
+ Further details on Digest implementation differences:
+ http://www.fngtps.com/2006/09/http-authentication
+ */
+ if(authp->iestyle && ((tmp = strchr((char *)uripath, '?')) != NULL)) {
+ md5this = (unsigned char *)aprintf("%s:%.*s", request,
+ curlx_sztosi(tmp - (char *)uripath),
+ uripath);
+ }
+ else
+ md5this = (unsigned char *)aprintf("%s:%s", request, uripath);
+
+ if(!md5this) {
+ free(ha1);
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ if(d->qop && Curl_raw_equal(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)*/
+ }
+ CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
+ Curl_md5it(md5buf, md5this);
+ free(md5this); /* free this again */
+ md5_to_ascii(md5buf, ha2);
+
+ if(d->qop) {
+ md5this = (unsigned char *)aprintf("%s:%s:%08x:%s:%s:%s",
+ ha1,
+ d->nonce,
+ d->nc,
+ d->cnonce,
+ d->qop,
+ ha2);
+ }
+ else {
+ md5this = (unsigned char *)aprintf("%s:%s:%s",
+ ha1,
+ 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 */
+ 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"
+ */
+
+ if(d->qop) {
+ *allocuserpwd =
+ aprintf( "%sAuthorization: Digest "
+ "username=\"%s\", "
+ "realm=\"%s\", "
+ "nonce=\"%s\", "
+ "uri=\"%s\", "
+ "cnonce=\"%s\", "
+ "nc=%08x, "
+ "qop=%s, "
+ "response=\"%s\"",
+ proxy?"Proxy-":"",
+ userp,
+ d->realm,
+ d->nonce,
+ uripath, /* this is the PATH part of the URL */
+ d->cnonce,
+ d->nc,
+ d->qop,
+ request_digest);
+
+ 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. */
+ }
+ else {
+ *allocuserpwd =
+ aprintf( "%sAuthorization: Digest "
+ "username=\"%s\", "
+ "realm=\"%s\", "
+ "nonce=\"%s\", "
+ "uri=\"%s\", "
+ "response=\"%s\"",
+ proxy?"Proxy-":"",
+ userp,
+ d->realm,
+ d->nonce,
+ uripath, /* this is the PATH part of the URL */
+ request_digest);
+ }
+ if(!*allocuserpwd)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* Add optional fields */
+ if(d->opaque) {
+ /* append opaque */
+ tmp = aprintf("%s, opaque=\"%s\"", *allocuserpwd, d->opaque);
+ if(!tmp)
+ return CURLE_OUT_OF_MEMORY;
+ free(*allocuserpwd);
+ *allocuserpwd = tmp;
+ }
+
+ if(d->algorithm) {
+ /* append algorithm */
+ tmp = aprintf("%s, algorithm=\"%s\"", *allocuserpwd, d->algorithm);
+ if(!tmp)
+ return CURLE_OUT_OF_MEMORY;
+ free(*allocuserpwd);
+ *allocuserpwd = tmp;
+ }
+
+ /* append CRLF + zero (3 bytes) to the userpwd header */
+ tmp = realloc(*allocuserpwd, strlen(*allocuserpwd) + 3);
+ if(!tmp)
+ return CURLE_OUT_OF_MEMORY;
+ strcat(tmp, "\r\n");
+ *allocuserpwd = tmp;
+
+ return CURLE_OK;
+}
+
+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;
+
+ d->nc = 0;
+ d->algo = CURLDIGESTALGO_MD5; /* default algorithm */
+ d->stale = FALSE; /* default means normal, not stale */
+}
+
+
+void Curl_digest_cleanup(struct SessionHandle *data)
+{
+ digest_cleanup_one(&data->state.digest);
+ digest_cleanup_one(&data->state.proxydigest);
+}
+
+#endif
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