Luca Altea's major HTTP Digest update

lib/http_digest.c

@@ -33,9 +33,10 @@
 #include "urldata.h"
 #include "sendf.h"
 #include "strequal.h"
-
+#include "base64.h"
 #include "md5.h"
 #include "http_digest.h"
+#include "strtok.h"
 #include "url.h" /* for Curl_safefree() */
 
 #define _MPRINTF_REPLACE /* use our functions only */
@@ -57,6 +58,10 @@ CURLdigest Curl_input_digest(struct connectdata *conn,
                                               header */
 {
   bool more = TRUE;
+  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 = &data->state.digest;
@@ -94,16 +99,43 @@ CURLdigest Curl_input_digest(struct connectdata *conn,
           d->nonce = strdup(content);
         }
         else if(strequal(value, "stale")) {
-          if(strequal(content, "true"))
+          if(strequal(content, "true")) {
             d->stale = TRUE;
+            d->nc = 1; /* we make a new nonce now */
           }
-        else if(strequal(value, "cnonce")) {
-          d->cnonce = strdup(content);
         }
         else if(strequal(value, "realm")) {
           d->realm = strdup(content);
         }
+        else if(strequal(value, "opaque")) {
+          d->opaque = strdup(content);
+        }
+        else if(strequal(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);
+          token = strtok_r(tmp, ",", &tok_buf);
+          while (token != NULL) {
+            if (strequal(token, "auth")) {
+              foundAuth = TRUE;
+            }
+            else if (strequal(token, "auth-int")) {
+              foundAuthInt = TRUE;
+            }
+            token = strtok (NULL, ",");
+          }
+          free(tmp);
+          /*select only auth o auth-int. Otherwise, ignore*/
+          if (foundAuth) {
+            d->qop = strdup("auth");
+          }
+          else if (foundAuthInt) {
+            d->qop = strdup("auth-int");
+          }
+        }
         else if(strequal(value, "algorithm")) {
+          d->algorithm = strdup(content);
           if(strequal(content, "MD5-sess"))
             d->algo = CURLDIGESTALGO_MD5SESS;
           else if(strequal(content, "MD5"))
@@ -127,7 +159,6 @@ CURLdigest Curl_input_digest(struct connectdata *conn,
     /* 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;
 
@@ -159,14 +190,31 @@ CURLcode Curl_output_digest(struct connectdata *conn,
      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 ha1[33]; /* 32 digits and 1 zero byte */
-  unsigned char ha2[33];
   unsigned char request_digest[33];
   unsigned char *md5this;
+  unsigned char *ha1;
+  unsigned char ha2[33];/* 32 digits and 1 zero byte */
+  char cnoncebuf[7];
+  char *cnonce;
+  char *tmp = NULL;
+  struct timeval now;
 
   struct SessionHandle *data = conn->data;
   struct digestdata *d = &data->state.digest;
 
+  ha1 = (unsigned char *)malloc(33); /* 32 digits and 1 zero byte */
+
+  if(!d->nc)
+    d->nc = 1;
+
+  if(!d->cnonce) {
+    /* Generate a cnonce */
+    now = Curl_tvnow();
+    snprintf(cnoncebuf, sizeof(cnoncebuf), "%06d", now.tv_sec);
+    Curl_base64_encode(cnoncebuf, strlen(cnoncebuf), &cnonce);
+    d->cnonce = cnonce;
+  }
+
   /*
     if the algorithm is "MD5" or unspecified (which then defaults to MD5):
 
@@ -177,40 +225,61 @@ CURLcode Curl_output_digest(struct connectdata *conn,
     A1 = H( unq(username-value) ":" unq(realm-value) ":" passwd )
          ":" unq(nonce-value) ":" unq(cnonce-value)
   */
-  if(d->algo == CURLDIGESTALGO_MD5SESS) {
+
   md5this = (unsigned char *)
-      aprintf("%s:%s:%s:%s:%s",
+    aprintf("%s:%s:%s", conn->user, d->realm, conn->passwd);
-              conn->user,
-              d->realm,
-              conn->passwd,
-              d->nonce,
-              d->cnonce);
-  }
-  else {
-    md5this = (unsigned char *)
-      aprintf("%s:%s:%s",
-              conn->user,
-              d->realm,
-              conn->passwd);
-  }
   Curl_md5it(md5buf, md5this);
   free(md5this); /* free this again */
   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);
+
+    free(ha1);
+    ha1 = (unsigned char *)tmp;
+  }
+
   /*
+    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)
   */
 
   md5this = (unsigned char *)aprintf("%s:%s", request, uripath);
+  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)*/
+  }
   Curl_md5it(md5buf, md5this);
   free(md5this); /* free this again */
   md5_to_ascii(md5buf, ha2);
 
-  md5this = (unsigned char *)aprintf("%s:%s:%s", ha1, d->nonce,
+  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);
+
   Curl_md5it(md5buf, md5this);
   free(md5this); /* free this again */
   md5_to_ascii(md5buf, request_digest);
@@ -222,18 +291,73 @@ CURLcode Curl_output_digest(struct connectdata *conn,
   */
 
   Curl_safefree(conn->allocptr.userpwd);
+
+  if (d->qop) {
     conn->allocptr.userpwd =
       aprintf( "Authorization: Digest "
                "username=\"%s\", "
                "realm=\"%s\", "
                "nonce=\"%s\", "
                "uri=\"%s\", "
-             "response=\"%s\"\r\n",
+               "cnonce=\"%s\", "
+               "nc=\"%08x\", "
+               "qop=\"%s\", "
+               "response=\"%s\"",
                conn->user,
                d->realm,
                d->nonce,
                uripath, /* this is the PATH part of the URL */
-             request_digest );
+               d->cnonce,
+               d->nc,
+               d->qop,
+               request_digest);
+
+    if(strequal(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 {
+    conn->allocptr.userpwd =
+      aprintf( "Authorization: Digest "
+               "username=\"%s\", "
+               "realm=\"%s\", "
+               "nonce=\"%s\", "
+               "uri=\"%s\", "
+               "response=\"%s\"",
+               conn->user,
+               d->realm,
+               d->nonce,
+               uripath, /* this is the PATH part of the URL */
+               request_digest);
+  }
+
+  /* Add optional fields */
+  if(d->opaque) {
+    /* append opaque */
+    tmp = aprintf(", opaque=\"%s\"", d->opaque);
+    conn->allocptr.userpwd = (char*)
+      realloc(conn->allocptr.userpwd,
+              strlen(conn->allocptr.userpwd) + strlen(tmp) + 1);
+    strcat(conn->allocptr.userpwd, tmp);
+    free(tmp);
+  }
+
+  if(d->algorithm) {
+    /* append algorithm */
+    tmp = aprintf(", algorithm=\"%s\"", d->algorithm);
+    conn->allocptr.userpwd = (char*)
+      realloc(conn->allocptr.userpwd,
+              strlen(conn->allocptr.userpwd) + strlen(tmp) + 1);
+    strcat(conn->allocptr.userpwd, tmp);
+    free(tmp);
+  }
+
+  /* append CRLF to the userpwd header */
+  conn->allocptr.userpwd = (char*)
+    realloc(conn->allocptr.userpwd,
+            strlen(conn->allocptr.userpwd) + 3 + 1);
+  strcat(conn->allocptr.userpwd, "\r\n");
 
   return CURLE_OK;
 }
@@ -254,8 +378,20 @@ void Curl_digest_cleanup(struct SessionHandle *data)
     free(d->realm);
   d->realm = NULL;
 
-  d->algo = CURLDIGESTALGO_MD5; /* default algorithm */
+  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 */
 }
 

lib/urldata.h

@@ -171,6 +171,10 @@ struct digestdata {
   char *realm;
   int algo;
   bool stale; /* set true for re-negotiation */
+  char *opaque;
+  char *qop;
+  char *algorithm;
+  int nc; /* nounce count */
 };
 
 typedef enum {