Captive portal not redirecting on https requests. problem on every browser



  • U mean to say that normally captive portal cannot redirect the https request if user not logged in? mean this is not possible?



  • @fahad77678 said in Captive portal not redirecting on https requests. problem on every browser:

    mean this is not possible?

    You know the ansswer already.

    https == SSL traffic can NOT be intercepted. If that would be possible, that https:// sites are identical to http:// visits.

    You do know what https:// is, right ? What it stands for - what it means ?

    Example : if you type in https:/:www.google.com, your browser ill first resolve google.com. As soon as it gets an IP, it will do https://172.217.22.142/ (on port 443).
    In the reply there will be a certificate that states that it is connected to "*.google.com" .
    If the captive portal intercepts this request, it will not return the certificate of Google, but it own certificate - which will be anything but not "google.com". Your browser, being smart, knows that you want to connect to google.com, but some other site replied. The browser knows it's request is redirected- or their is some other MITM.
    It will bail out with the famous certificate error message.



  • In simple words my captive portal not redirecting. please help me on this



  • On a device that you connect to the portal network - but not logged in yet, show what these commands show to you :

    ipconfig  /all
    
    nslookup google.com
    

    or better

    nslookup onisep.fr
    


  • C:\Users\fahad>nslookup onisep.fr
    Server: pfsense.localdomain
    Address: 192.168.1.1

    Non-authoritative answer:
    Name: onisep.fr
    Address: 213.162.50.177



  • @gertjan said in Captive portal not redirecting on https requests. problem on every browser:

    nslookup google.com

    C:\Users\fahad>nslookup google.com
    Server: pfsense.localdomain
    Address: 192.168.1.1

    Non-authoritative answer:
    Name: google.com
    Addresses: 2404:6800:4003:806::200e
    74.125.130.113
    74.125.130.102
    74.125.130.139
    74.125.130.138
    74.125.130.101
    74.125.130.100



  • C:\Users\fahad>ipconfig/all

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : Muhammad-Fahad
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : localdomain

    Ethernet adapter Ethernet:

    Connection-specific DNS Suffix . : localdomain
    Description . . . . . . . . . . . : Intel(R) 82579LM Gigabit Network Connection
    Physical Address. . . . . . . . . : D4-C9-EF-E5-F4-27
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::1998:6eb8:b089:d1a6%24(Preferred)
    IPv4 Address. . . . . . . . . . . : 192.168.1.10(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Lease Obtained. . . . . . . . . . : Monday, January 7, 2019 4:05:06 PM
    Lease Expires . . . . . . . . . . : Monday, January 7, 2019 5:50:52 PM
    Default Gateway . . . . . . . . . : fe80::1:1%24
    192.168.1.1
    DHCP Server . . . . . . . . . . . : 192.168.1.1
    DHCPv6 IAID . . . . . . . . . . . : 164940271
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-21-ED-F6-29-D4-C9-EF-E5-F4-27
    DNS Servers . . . . . . . . . . . : 192.168.1.1
    NetBIOS over Tcpip. . . . . . . . : Enabled
    Connection-specific DNS Suffix Search List :
    localdomain

    Wireless LAN adapter Local Area Connection* 4:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #3
    Physical Address. . . . . . . . . : 3C-A9-F4-2E-A0-41
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes

    Wireless LAN adapter Local Area Connection* 5:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #4
    Physical Address. . . . . . . . . : 3E-A9-F4-2E-A0-40
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes

    Wireless LAN adapter Wi-Fi:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . : Home
    Description . . . . . . . . . . . : Intel(R) Centrino(R) Ultimate-N 6300 AGN
    Physical Address. . . . . . . . . : 3C-A9-F4-2E-A0-40
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes



  • @fahad77678 said in Captive portal not redirecting on https requests. problem on every browser:

    92.168.1.1

    Ok, looks all good.
    DNS works - pfSense is the DNS resolver for your clients.

    You use the default login page ?

    What GUI firewall rules on your captive portal interface ?



  • All is on default settings. Gui Login all is on default settings. Yoy can say that firewall is on default settings i had just configure captive portal


  • Rebel Alliance

    @fahad77678 said in Captive portal not redirecting on https requests. problem on every browser:

    Its only works when i delete the browser history. Then when i entered the google.com and every dns with .com when i use the it redirects to login page. but when the session expire the its does not redirecting to me on login page. i want that if i entered only a single word in google it should redirect to me into login page if i am not logged in

    Again : that is an expected behaviour.

    It is not possible to redirect HTTPS connections. Not only with pfSense, but also with any other router. HTTPS connections just can't be redirected, that's by design. You can learn more here : https://stackoverflow.com/questions/51562003/captive-portal-and-https-redirect

    That shoudn't be an issue because modern web browsers do handle captive portals pretty well, using HTTP test requests (cf my picture above)



  • @free4
    yeah i have checked your picture but its only works in firefox not on another browsers. how would it be possible on google chrome?


  • Rebel Alliance

    @fahad77678 chrome also implement captive portal tests

    alt text

    Android and apple devices also implement this feature



  • @free4
    But in my case chrome not doing like this.
    can you come on teamviwer ?



  • @free4
    Did you enable https login enable in captive portal or not?
    in my case if i disable https login then it cant reach the login page. chrome says site cant be reach if i search some sites.
    same case in firefox. firefox only promt for login netwrok but not redirecting to catptive page.



  • The browser indicates that a user action is needed.
    It's probably not directing you right away some where else, which seems rather logic to me: the user wants to browse site a.b.c. - the browser won't take him to d.e.f (our captive portal login page) but suggests the a user action is needed.

    These are my observations :
    Use http (default) and the https portal login. Things will go very smooth.
    Chrome might be "portal aware" these days. I'm using the captive portal in a hotel - do not explain clients how to connect - and they connect (mostly not being IT experts, they all manage to connect using whatever device).

    As said here - and in the doc : https you should obtain a certificate signed by an authority.
    This implies that you should use an existing domain name on your portal LAN, like
    portal.your-domaine.tld
    You can buy such a corticate - or use the acme package.
    True : the acme package works for you if you know what to do and how to do it



  • @gertjan
    Use http (default) and the https portal login. Things will go very smooth.
    what do you mean by this how can i do this in pfsense. actually i m new in pfsesne



  • @gertjan
    can you give me the step step configuration of captive portal with dns resolver?



  • @fahad77678 said in Captive portal not redirecting on https requests. problem on every browser:

    @gertjan
    can you give me the step step configuration of captive portal with dns resolver?

    https://www.youtube.com/watch?v=qb5TDpihnq4&t=111s
    https://www.netgate.com/docs/pfsense/captiveportal/index.html

    The Resolver : nothing to do. The default settings - as set on installation, are just perfect.



  • @gertjan
    is it necessary to add captive portal ports add in firewall's wan and lan rules ?
    it it is? the which ports should i add to the rules ?



  • @fahad77678 said in Captive portal not redirecting on https requests. problem on every browser:

    @gertjan
    is it necessary to add captive portal ports add in firewall's wan and lan rules ?
    it it is? the which ports should i add to the rules ?

    Two cases :
    If you activate the portal on the LAN you have nothing to do : the default firewall rule is a pass-all, the portal will work right away.
    If you activate the captive portal on an extra interface (the best choice !), like OPT1, you have to, initially, add one firewall rule : the same one as you can find on the LAN interface.
    Like this :

    0_1547200712194_bf62f6c6-807f-413d-8f57-a02fd9357a26-image.png

    Never ever add firewall rules to the WAN interface. Rules for that interface belong to the experts.


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