id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
1494	Null character in error.log	fffilimonov@…		"With config like this:

      auth_basic ""Restricted"";
      auth_basic_user_file $host/htpasswd;

If user not found in file nginx writes to error log string:
{{{
2018/02/26 15:19:33 [error] 85925#0: *3 user ""addd"" was not found in ""/Users/vf/nginx/127.0.0.1/htpasswd^@"", client: 127.0.0.1, server: , request: ""GET / HTTP/1.1"", host: ""127.0.0.1:8080""
}}}
The issue only with variable in auth_basic_user_file path.
With config like this no null char:

      auth_basic ""Restricted"";
      auth_basic_user_file /root/htpasswd;

ngx_http_auth_basic_module.c
{{{
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                  ""user \""%V\"" was not found in \""%V\"""",
                  &r->headers_in.user, &user_file);
}}}
user_file - ngx_str_t
So, it means there is a string inside user_file.data with null terminator.

In debug log i can see:
{{{
2018/02/26 16:23:46 [debug] 93741#0: *1 access phase: 6
2018/02/26 16:23:46 [debug] 93741#0: *1 access phase: 7
2018/02/26 16:23:46 [debug] 93741#0: *1 http script var: ""127.0.0.1""
2018/02/26 16:23:46 [debug] 93741#0: *1 http script copy: ""/htpasswd^@""
2018/02/26 16:23:46 [debug] 93741#0: *1 http script fullname: ""/Users/vf/nginx/127.0.0.1/htpasswd^@""
2018/02/26 16:23:46 [debug] 93741#0: *1 read: 9, 00007FFEE2FA7E00, 2048, 0
2018/02/26 16:23:46 [error] 93741#0: *1 user ""addd"" was not found in ""/Users/vf/nginx/127.0.0.1/htpasswd^@"", client: 127.0.0.1, server: , request: ""GET / HTTP/1.1"", host: ""127.0.0.1:8080""
}}}
The null char we got from ngx_http_script.c.

The simple fix is:
{{{
    ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                  ""user \""%V\"" was not found in \""%s\"""",
                  &r->headers_in.user, user_file.data);
}}}

But possible the problem is somewhere in other function which builds the path."	defect	closed	minor		nginx-module	1.13.x	fixed		fffilimonov@…	Darwin 17.3.0 Darwin Kernel Version 17.3.0: Thu Nov  9 18:09:22 PST 2017; root:xnu-4570.31.3~1/RELEASE_X86_64 x86_64	"nginx version: nginx/1.13.10
built by clang 9.0.0 (clang-900.0.38)
configure arguments:"