Root login from serial console

[Rajeev Bansal]

Thanks Denys. I could fix the problem, actually there was no /etc/shadow 
file in my root file system and in the /etc/passwd file, the root user 
entry was:
root:x:0:0:root:/root:/bin/ash
Since shadow file was missing so somehow login utility was never probing 
me for the password.

To solve this I created the /etc/shadow file and reset the root password 
and it worked for me.

Thanks a lot.
Rajeev Bansal.


Denys Vlasenko wrote:
> On Wednesday 07 November 2007 09:50, Rajeev Bansal wrote:
>   
>> Hi All,
>>
>> I am using the busybox in my root file system, everything is fine with 
>>     
>
> Which version of busybox do you use?
>
>   
>> that, except when I try to login as a root from serial console it 
>> doesn't prompt me for the password and immediately say "Login 
>> Incorrect".
>>     
>
> Do non-root logins work? Does it work if you configure
> busybox without CONFIG_FEATURE_SECURETTY=y?
>
>   
>> I need to login as a root from  serial console, so can  
>> anyone tell me how I can make it happen. I have a /etc/securetty file 
>> present and I have added the entry for ttyS0 in that.
>>     
>
> Sounds like you did everything right.
>
>   
>> I think login  
>> utility of busybox doesn't read the securetty file.
>>     
>
> It reads /etc/securetty here:
>
> #if ENABLE_FEATURE_SECURETTY && !ENABLE_PAM
> static int check_securetty(void)
> {
>         FILE *fp;
>         int i;
>         char buf[256];
>
>         fp = fopen("/etc/securetty", "r");
>         if (!fp) {
>                 /* A missing securetty file is not an error. */
>                 return 1;
>         }
>         while (fgets(buf, sizeof(buf)-1, fp)) {
>                 for (i = strlen(buf)-1; i >= 0; --i) {
>                         if (!isspace(buf[i]))
>                                 break;
>                 }
>                 buf[++i] = '\0';
>                 if (!buf[0] || (buf[0] == '#'))
>                         continue;
>                 if (strcmp(buf, short_tty) == 0) {
>                         fclose(fp);
>                         return 1;
>                 }
>         }
>         fclose(fp);
>         return 0;
> }
> #else
>
>
> and checks here:
>
>                 pw = getpwnam(username);
>                 if (!pw) {
>                         strcpy(username, "UNKNOWN");
>                         goto fake_it;
>                 }
>
>                 if (pw->pw_passwd[0] == '!' || pw->pw_passwd[0] == '*')
>                         goto auth_failed;
>
>                 if (opt & LOGIN_OPT_f)
>                         break; /* -f USER: success without asking passwd */
>
>                 if (pw->pw_uid == 0 && !check_securetty())  <==== HERE
>                         goto auth_failed;
>
> --
> vda
>
>
>   



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