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  67177   Fri Jan 27 14:05:09 2012 Idea Christian Herzogherzog@phys.ethz.chQuestionLinux2.9.0el cheapo LDAP binding

Hi all,

 

we would like to hook elog to our LDAP server. Instead of writing a full-featured LDAP auth module for elog, I have the following idea: use Apache's LDAP module to require LDAP auth for a single logbook:

 

 <Location /elog/admin>

        Use PhysLDAP

        Use RequirePhysLDAPGroup isg


        RewriteEngine On

        RewriteCond %{LA-U:REMOTE_USER} (.+)

        RewriteRule . - [E=RU:%1]

        RequestHeader add X-Forwarded-User %{RU}e

</Location>
the two Use statements are Apache macros that define our LDAP settings. The last 4 lines are necessary for Apache to pass on the logged in user to the proxied elog (ends up in ENV X-Forwarded-User).
In elogd.c, I added 
 
   /* extract REMOTE_USER */

   if ((p = strstr(request, "X-Forwarded-User:")) != NULL) {

      p += 17;

      while (*p && *p == ' ')

         p++;

      strlcpy(remote_user, p, sizeof(remote_user));

      if (strchr(remote_user, '\r'))

         *strchr(remote_user, '\r') = 0;


         char sid[32];

         /* get a new session ID */

         sid_new(NULL, remote_user, (char *) inet_ntoa(rem_addr), sid);


         /* set SID cookie */

         set_sid_cookie(NULL, sid);

         // TODO: set lbs!

   }


to process_http_request in order to extract the LDAP login. I have managed to populate the author field with remote_user, but what I'd really like is to write a cookie containing this login name so that session handling kicks in. You can see that I attempt to write a cookie, but elogd segfaults at set_sid_cookie() (gdb backtrace: 
set_cookie (lbs=0x0, name=0x483b22 "sid", value=0x7ffffffd7590 "4831386B7B333A99", global=0, expiration=0x7ffffffd7300 "")
 
Would anyone be willing to help me with this? I'm not at all familiar with the program flow in elogd and my C is a bit rusty...
 
thanks,
-Christian
 
--
Dr. Christian Herzog <herzog@phys.ethz.ch>  support: +41 44 633 26 68
IT Services Group, HPT H 8                    voice: +41 44 633 39 50
Department of Physics, ETH Zurich
8093 Zurich, Switzerland                     http://nic.phys.ethz.ch/
 
 
  67178   Mon Jan 30 09:31:51 2012 Reply Christof Hankehanke@rzg.mpg.deQuestionLinux2.9.0Re: el cheapo LDAP binding

Hi Christian,

 I have also the need to do auth on the webserver, but  I tried to integrate it into elogd as far as I could.

However, I do not try to set a special cookie to set the username, but always use 
 "X-Forwarded-User".  Like this, every request is authenticated by the webserver in front.

If that's not too heavy for you, try out the applied patch.

 

HTH,

Christof

PS:

 

@Stefan:

If you are willing to integrate this into the official tree, 

I can provide some docs for it (like setting author 

directly etc.)

-----------------------------------------------------------------
Christof Hanke e-mail hanke@rzg.mpg.de
RZG (Rechenzentrum Garching) phone +49-89-3299-1041
Computing Center of the Max-Planck-Gesellschaft (MPG) and the
Institut für Plasmaphysik (IPP)
 

 

Christian Herzog wrote:

Hi all,

 

we would like to hook elog to our LDAP server. Instead of writing a full-featured LDAP auth module for elog, I have the following idea: use Apache's LDAP module to require LDAP auth for a single logbook: 

 

 <Location /elog/admin>

        Use PhysLDAP

        Use RequirePhysLDAPGroup isg


        RewriteEngine On

        RewriteCond %{LA-U:REMOTE_USER} (.+)

        RewriteRule . - [E=RU:%1]

        RequestHeader add X-Forwarded-User %{RU}e

</Location>
the two Use statements are Apache macros that define our LDAP settings. The last 4 lines are necessary for Apache to pass on the logged in user to the proxied elog (ends up in ENV X-Forwarded- User).
In elogd.c, I added 
 
   /* extract REMOTE_USER */

   if ((p = strstr(request, "X-Forwarded-User:")) != NULL) {

      p += 17;

      while (*p && *p == ' ')

         p++;

      strlcpy(remote_user, p, sizeof(remote_user));

      if (strchr(remote_user, '\r'))

         *strchr(remote_user, '\r') = 0;


         char sid[32];

         /* get a new session ID */

         sid_new(NULL, remote_user, (char *) inet_ntoa(rem_addr), sid);


         /* set SID cookie */

         set_sid_cookie(NULL, sid);

         // TODO: set lbs!

   }


to process_http_request in order to extract the LDAP login. I have managed to populate the author field with remote_user, but what I'd really like is to write a cookie containing this login name so that session handling kicks in. You can see that I attempt to write a cookie, but elogd segfaults at set_sid_cookie() (gdb backtrace: 
set_cookie (lbs=0x0, name=0x483b22 "sid", value=0x7ffffffd7590 "4831386B7B333A99", 
global=0, expiration=0x7ffffffd7300 "")
 
Would anyone be willing to help me with this? I'm not at all familiar with the program flow in elogd and my C is a bit rusty...
 
thanks,
-Christian
 
--
Dr. Christian Herzog <herzog@phys.ethz.ch>  support: +41 44 633 26 68
IT Services Group, HPT H 8                    voice: +41 44 633 39 50
Department of Physics, ETH Zurich
8093 Zurich, Switzerland                     http://nic.phys.ethz.ch/
 
 

 

 

Attachment 1: elogd-addwebserverauth.patch
--- trunk/webservices/ELOG/elog-2.9.0/src/elogd.c	2011/10/20 14:36:27	3247
+++ trunk/webservices/ELOG/elog-2.9.0/src/elogd.c	2012/01/30 08:14:32	4130
@@ -37,6 +37,7 @@
 char listen_interface[256];
 char theme_name[80];
 char http_host[256];
+char http_user[256];
 
 char _param[MAX_PARAM][NAME_LENGTH];
 char _value[MAX_PARAM][NAME_LENGTH];
@@ -8534,7 +8535,7 @@
    if (old_pwd[0] || new_pwd[0]) {
       if (user[0]) {
 
-         if (stristr(auth, "Kerberos")) {
+         if (stristr(auth, "Kerberos") || stristr(auth, "Webserver")) {
             if (strcmp(new_pwd, new_pwd2) != 0)
                wrong_pwd = 2;
          } else {
@@ -12677,6 +12679,12 @@
       return 0;
    }
 
+   /* if we have outsourced the authentication, use external username */
+   getcfg(lbs->name, "Authentication", str, sizeof(str));
+   if ( stristr(str, "Webserver")) {
+       strncpy(user,http_user,sizeof(user));
+   }
+
    /* check for full name */
    if (!isparam("new_full_name") || *getparam("new_full_name") == 0) {
       sprintf(str, loc("Please enter \"%s\""), loc("Full name"));
@@ -13247,7 +13255,7 @@
    rsprintf("<tr><td nowrap width=\"15%%\">%s:</td>\n", loc("Login name"));
 
    getcfg(lbs->name, "Authentication", auth, sizeof(auth));
-   if (stristr(auth, "Kerberos"))
+   if (stristr(auth, "Kerberos") || stristr(auth, "Webserver"))
       rsprintf("<td><input type=text size=40 name=new_user_name value=\"%s\" readonly></td></tr>\n", str);
    else
       rsprintf("<td><input type=text size=40 name=new_user_name value=\"%s\"></td></tr>\n", str);
@@ -13334,6 +13342,7 @@
 
    rsprintf("<tr><td class=\"menuframe\"><span class=\"menu1\">\n");
 
+  /* remove user-management buttons 
    if (is_admin_user(logbook, getparam("unm")) || !getcfg(logbook, "allow password change", str, sizeof(str))
        || atoi(str) == 1)
       rsprintf("<input type=submit name=cmd value=\"%s\">\n", loc("Change password"));
@@ -13345,7 +13354,7 @@
       strlcpy(str, loc("Change config file"), sizeof(str));
       rsprintf("<input type=submit name=cmd value=\"%s\">\n", str);
    }
-
+   */
    rsprintf("</span></td></tr></table>\n\n");
    show_bottom_text(lbs);
    rsprintf("</form></body></html>\r\n");
@@ -13579,9 +13588,9 @@
       /*---- header ----*/
 
       getcfg(lbs->name, "Authentication", str, sizeof(str));
-      if (stristr(str, "Kerberos")) {
+      if (stristr(str, "Kerberos")|| stristr(str, "Webserver")) {
          show_error
-             ("This installation of ELOG uses site authentification\nwhere password recovery is not possible");
+             ("This installation of ELOG has outsourced its authentification\nwhere password recovery is not possible");
          return;
       }
 
@@ -13609,6 +13618,7 @@
 
 void show_new_user_page(LOGBOOK * lbs, char *user)
 {
+   char str[256];
    /*---- header ----*/
 
    show_html_header(lbs, TRUE, loc("ELOG new user"), TRUE, FALSE, NULL, FALSE);
@@ -13644,13 +13654,14 @@
 
    rsprintf("<tr><td nowrap>Email:</td>\n");
    rsprintf("<td colspan=2><input type=text size=40 name=new_user_email></tr>\n");
+   getcfg(lbs->name, "Authentication", str, sizeof(str));
+   if (!stristr(str, "Kerberos") && !stristr(str, "Webserver")) {
+       rsprintf("<tr><td nowrap>%s:</td>\n", loc("Password"));
+       rsprintf("<td colspan=2><input type=password size=40 name=newpwd>\n");
 
-   rsprintf("<tr><td nowrap>%s:</td>\n", loc("Password"));
-   rsprintf("<td colspan=2><input type=password size=40 name=newpwd>\n");
-
-   rsprintf("<tr><td nowrap>%s:</td>\n", loc("Retype password"));
-   rsprintf("<td colspan=2><input type=password size=40 name=newpwd2>\n");
-
+       rsprintf("<tr><td nowrap>%s:</td>\n", loc("Retype password"));
+       rsprintf("<td colspan=2><input type=password size=40 name=newpwd2>\n");
+   }
    rsprintf("</td></tr></table>\n");
 
    /*---- menu buttons ----*/
@@ -25391,7 +25402,12 @@
    if (!enum_user_line(lbs, 0, str, sizeof(str))) {
       if (isparam("new_user_name"))
          return TRUE;
-      show_new_user_page(lbs, NULL);
+      getcfg(lbs->name, "Authentication", str, sizeof(str));
+      if (stristr(str, "Webserver")) {
+         show_new_user_page(lbs, http_user);
+      } else {
+         show_new_user_page(lbs, NULL);
+      }
       return FALSE;
    }
 
@@ -25417,7 +25433,9 @@
       }
    }
 
-   /* if invalid or no session ID, show login page */
+   /* if invalid or no session ID, show login page, 
+      unless we have outsourced the authentication to webserver
+   */
    if (!skip_sid_check && !sid_check(sid, user_name)) {
       if (isparam("redir"))
          strlcpy(str, getparam("redir"), sizeof(str));
@@ -26397,6 +26415,25 @@
    if (lbs->n_attr < 0)
       return;
 
+   /* if we outsource the authentication to Webserver and have no sid, just set a new sid  */
+   getcfg(lbs->name, "Authentication", str, sizeof(str));
+   if (stristr(str, "Webserver")) {
+      if (http_user[0]) {
+         if (!sid_check(getparam("sid"), http_user)) { /*  if we don't have a sid yet, set it */
+            /* get a new session ID */
+            sid_new(lbs, http_user, (char *) inet_ntoa(rem_addr), sid);
+            /* set SID cookie */
+            set_sid_cookie(lbs, sid);
+         }
+     } else {
+        sprintf(str, "Error: Misconfigured webserver, did not get X-Forwarded-User from it.");
+        show_error(str);
+        return;
+     }
+   }
+
+
+
    /* check for new login */
    if (isparam("uname") && isparam("upassword")) {
       /* log logins */
@@ -27650,6 +27693,17 @@
          *strchr(http_host, '\r') = 0;
    }
 
+   /* extract X-Forwarded-User into http_user if Authentication==Webserver */
+   http_user[0] = 0;
+   if ((p = strstr(request, "X-Forwarded-User:")) != NULL) {
+      p += 17;
+      while (*p && *p == ' ')
+         p++;
+      strlcpy(http_user, p, sizeof(http_user));
+      if (strchr(http_user, '\r'))
+         *strchr(http_user, '\r') = 0;
+   }
+
    /* extract "X-Forwarded-For:" */
    if ((p = strstr(request, "X-Forwarded-For:")) != NULL) {
       p += 16;
  67179   Mon Jan 30 18:23:39 2012 Reply Yoshio Imai$user_emailQuestionWindows2.9.0Re: Return Code

It depends on how you actually call the elog client, but it outputs a message

 Message successfully transmitted, ID=(new message id)

to the console upon successful transmission. Maybe you can catch this and evaluate?

  67180   Thu Feb 2 16:51:32 2012 Question Kenneth Nielsenk.nielsen81@gmail.comQuestionLinux2.9Migrate to elog

Hallo and thanks for a great program.

At my work we have previously been using another program (Rednotebook) for our lab journals, but now we wish to migrate to elog because it is more configurable and because it runs in a browser.

We would off course like to move all of our old log entries with us. Luckily Rednotebook uses a standard module (YAML) for data storage, so I can easily access the data (e.g. with python) and I have already done do, and I have exchanged the native markup with html.

Now I would prefer it if I can make the elog data files directly, in stead of using the elog command, because that makes it possible and easy to revert the change, and also to not have to handle escaping html string before feeding them to elog on the commandline. I have actually already written the program that produces the elog data files, but now I have a few questions:

1) Is there an overall way of validating the datafiles, to make sure elog doesn't choke on them at some point in the future when I try to open one of the old entries. Along the same lines, does elog parse all the files when the demon is started, so if it starts then I'm ok?

2) What exactly are the requirements for the HTML content

2a) Will any valid html do, or are there some speciel requirements (e.g. like &nbsp; at blank lines)

2b) Does it require a particular version of html, because then I could at least validate it against that doctype beforehand

3) Is there a log from elog where I can see if it encounters something it doesn't like?

I hope the you can answer some of my questions.

Regards Kenneth

  67181   Fri Feb 3 09:30:20 2012 Reply Christian Herzogherzog@phys.ethz.chQuestionLinux2.9.0Re: el cheapo LDAP binding

Hi Christof,

 

wow thanks, that's (almost) exactly what I was looking for! I only had to add

 

 --- src/elogd.c.orig 2012-02-03 09:11:42.000000000 +0100
+++ src/elogd.c 2012-02-03 09:11:32.000000000 +0100
@@ -8375,6 +8375,10 @@
    strcpy(list[i], "remote_host");
    strlcpy(value[i++], rem_host, NAME_LENGTH);

+   /* add LDAP author */
+   strcpy(list[i], "http_user");
+   strlcpy(value[i++], http_user, NAME_LENGTH);
+

    /* add local host */
    strcpy(list[i], "host");
    strlcpy(value[i++], host_name, NAME_LENGTH);
 
in order to get
 

Preset Author = $http_user

to work.  I fully support getting your patches into upstream.

 

thanks a bunch,
-Christian
 

 

  67191   Mon Feb 13 13:38:19 2012 Entry Adam dellzoid@hotmail.comQuestionLinux2.7.8redirect permission

Hi All,

Perhaps a trivial question but some issues have arisen accessing my long-running elog with SSL enabled.  I suspect firewalls and browser updates are involved and I do not have the time or experience to diagnose and debug such a potential black-hole of difficulties.  Instead I am looking for a quick fix, and the first step - switching off sll - seems to work.  Now I would like to use redirect so that the elog is running under apache, however this is where I have stumbled; I have passwords so the plan is to eventually secure using apache.  Apache works fine and is running pages on ports 80 and 443, although I seem unable to redirect the elog (port 8080).  Following the instructions on the administrators guide I get:

Forbidden

You don't have permission to access /elog/ on this server.

The page is found at least so my redirect is doing something, and I suspect the solution is trivial, though I'm not too sure where to start.

 

-------------------

 

Also, what is  the best practice for updating one's elog version.  I originally installed using a tarball.

 

 

 

  67194   Mon Feb 13 22:13:40 2012 Question Diegodiego.obradors@ciemat.esQuestionWindows2.9.0top text in new user

 Hi,

I am using Top text becouse I would like to have the same header in all logbooks. However it is working in the "new user registration page" and I would like to evoid it. Is that possible?

Thank you so much!!

Diego

  67199   Wed Feb 15 17:13:08 2012 Reply Mark Bergmanmark.bergman@uphs.upenn.eduQuestionLinux2.90Re: error message "Command Config is not allowed" after registering

Mark Bergman wrote:

After registering, elog displays a page with the message:

     Error: Command "Config" is not allowed for user ""

However, the registration is successful. This causes confusion, and results in users registering multiple times.

 

In the elogd.conf file, I have the directive:

     Allow Config = bergman

 

Any suggestions?

 I loathe the idea of 'bumping' up one's own posting, but here I go...

 

Has anyone seen this issue, or have any solution? We've got people who register 8 or more times, since they see the "Error" message with each registration.

ELOG V3.1.5-3fb85fa6