Commit 071d0e0e authored by Christophe Jaillet's avatar Christophe Jaillet
Browse files

Fix a race condition. 

Authentication with valid credentials could be refused in case of concurrent accesses from different users.

PR 63124 [Simon Kappel <simon.kappel axis.com>]

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1853190 13f79535-47bb-0310-9956-ffa450edef68
parent 1c57058c

CHANGES

+3 −0
Original line number Diff line number Diff line 
                                                         -*- coding: utf-8 -*-

Changes with Apache 2.5.1

  *) mod_auth_digest: Fix a race condition. Authentication with valid credentials could be

     refused in case of concurrent accesses from different users.

     PR 63124 [Simon Kappel <simon.kappel axis.com>]



  *) mod_ssl: Don't unset FIPS mode on restart unless it's forced by

     configuration (SSLFIPS on) and not active by default in OpenSSL.

modules/aaa/mod_auth_digest.c

+12 −14
Original line number Diff line number Diff line
@@ -91,7 +91,6 @@ typedef struct digest_config_struct { 
    int          check_nc;

    const char  *algorithm;

    char        *uri_list;

    const char  *ha1;

} digest_config_rec;
@@ -152,6 +151,7 @@ typedef struct digest_header_struct { 
    apr_time_t            nonce_time;

    enum hdr_sts          auth_hdr_sts;

    int                   needed_auth;

    const char           *ha1;

    client_entry         *client;

} digest_header_rec;
@@ -1305,7 +1305,7 @@ static int hook_note_digest_auth_failure(request_rec *r, const char *auth_type) 
 */



static authn_status get_hash(request_rec *r, const char *user,

                             digest_config_rec *conf)

                             digest_config_rec *conf, const char **rethash)

{

    authn_status auth_result;

    char *password;
@@ -1357,7 +1357,7 @@ static authn_status get_hash(request_rec *r, const char *user, 
    } while (current_provider);



    if (auth_result == AUTH_USER_FOUND) {

        conf->ha1 = password;

        *rethash = password;

    }



    return auth_result;
@@ -1484,25 +1484,24 @@ static int check_nonce(request_rec *r, digest_header_rec *resp, 


/* RFC-2069 */

static const char *old_digest(const request_rec *r,

                              const digest_header_rec *resp, const char *ha1)

                              const digest_header_rec *resp)

{

    const char *ha2;



    ha2 = ap_md5(r->pool, (unsigned char *)apr_pstrcat(r->pool, resp->method, ":",

                                                       resp->uri, NULL));

    return ap_md5(r->pool,

                  (unsigned char *)apr_pstrcat(r->pool, ha1, ":", resp->nonce,

                                              ":", ha2, NULL));

                  (unsigned char *)apr_pstrcat(r->pool, resp->ha1, ":",

                                               resp->nonce, ":", ha2, NULL));

}



/* RFC-2617 */

static const char *new_digest(const request_rec *r,

                              digest_header_rec *resp,

                              const digest_config_rec *conf)

                              digest_header_rec *resp)

{

    const char *ha1, *ha2, *a2;



    ha1 = conf->ha1;

    ha1 = resp->ha1;



    a2 = apr_pstrcat(r->pool, resp->method, ":", resp->uri, NULL);

    ha2 = ap_md5(r->pool, (const unsigned char *)a2);
@@ -1515,7 +1514,6 @@ static const char *new_digest(const request_rec *r, 
                                               NULL));

}





static void copy_uri_components(apr_uri_t *dst,

                                apr_uri_t *src, request_rec *r) {

    if (src->scheme && src->scheme[0] != '\0') {
@@ -1738,7 +1736,7 @@ static int authenticate_digest_user(request_rec *r) 
        return HTTP_UNAUTHORIZED;

    }



    return_code = get_hash(r, r->user, conf);

    return_code = get_hash(r, r->user, conf, &resp->ha1);



    if (return_code == AUTH_USER_NOT_FOUND) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01790)
@@ -1771,7 +1769,7 @@ static int authenticate_digest_user(request_rec *r) 


    if (resp->message_qop == NULL) {

        /* old (rfc-2069) style digest */

        if (strcmp(resp->digest, old_digest(r, resp, conf->ha1))) {

        if (strcmp(resp->digest, old_digest(r, resp))) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01792)

                          "user %s: password mismatch: %s", r->user,

                          r->uri);
@@ -1801,7 +1799,7 @@ static int authenticate_digest_user(request_rec *r) 
            return HTTP_UNAUTHORIZED;

        }



        exp_digest = new_digest(r, resp, conf);

        exp_digest = new_digest(r, resp);

        if (!exp_digest) {

            /* we failed to allocate a client struct */

            return HTTP_INTERNAL_SERVER_ERROR;
@@ -1885,7 +1883,7 @@ static int add_auth_info(request_rec *r) 


        /* calculate rspauth attribute

         */

        ha1 = conf->ha1;

        ha1 = resp->ha1;



        a2 = apr_pstrcat(r->pool, ":", resp->uri, NULL);

        ha2 = ap_md5(r->pool, (const unsigned char *)a2);