httpauth.c File Reference

Hyper Text Transfer Protocol (HTTP) authentication. More...

#include <stdio.h>
#include <strings.h>
#include <errno.h>
#include <ipxe/http.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static struct http_authentication *	http_authentication (const char *name)
	Identify authentication scheme. More...
static int	http_parse_www_authenticate (struct http_transaction *http, char *line)
	Parse HTTP "WWW-Authenticate" header. More...
static int	http_format_authorization (struct http_transaction *http, char *buf, size_t len)
	Construct HTTP "Authorization" header. More...

Variables
struct http_response_header http_response_www_authenticate	__http_response_header
	HTTP "WWW-Authenticate" header. More...
struct http_request_header http_request_authorization	__http_request_header
	HTTP "Authorization" header. More...

Detailed Description

Hyper Text Transfer Protocol (HTTP) authentication.

Definition in file httpauth.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

http_authentication()

static struct http_authentication* http_authentication ( const char *  name )

static

Identify authentication scheme.

Parameters

http	HTTP transaction
name	Scheme name

Return values

auth	Authentication scheme, or NULL

Definition at line 45 of file httpauth.c.

                                                                             {
        struct http_authentication *auth;

        /* Identify authentication scheme */
        for_each_table_entry ( auth, HTTP_AUTHENTICATIONS ) {
                if ( strcasecmp ( name, auth->name ) == 0 )
                        return auth;
        }

        return NULL;
}

References for_each_table_entry, HTTP_AUTHENTICATIONS, http_authentication::name, name, NULL, and strcasecmp().

Referenced by http_parse_www_authenticate().

http_parse_www_authenticate()

static int http_parse_www_authenticate ( struct http_transaction *  http, char *  line  )

static

Parse HTTP "WWW-Authenticate" header.

Parameters

http	HTTP transaction
line	Remaining header line

Return values

rc	Return status code

Definition at line 64 of file httpauth.c.

                                                      {
        struct http_authentication *auth;
        char *name;
        int rc;

        /* Get scheme name */
        name = http_token ( &line, NULL );
        if ( ! name ) {
                DBGC ( http, "HTTP %p malformed WWW-Authenticate \"%s\"\n",
                       http, line );
                return -EPROTO;
        }

        /* Identify scheme */
        auth = http_authentication ( name );
        if ( ! auth ) {
                DBGC ( http, "HTTP %p unrecognised authentication scheme "
                       "\"%s\"\n", http, name );
                /* Ignore; the server may offer other schemes */
                return 0;
        }

        /* Use first supported scheme */
        if ( http->response.auth.auth )
                return 0;
        http->response.auth.auth = auth;

        /* Parse remaining header line */
        if ( ( rc = auth->parse ( http, line ) ) != 0 ) {
                DBGC ( http, "HTTP %p could not parse %s WWW-Authenticate "
                       "\"%s\": %s\n", http, name, line, strerror ( rc ) );
                return rc;
        }

        return 0;
}

References http_response_auth::auth, http_response::auth, DBGC, EPROTO, http_authentication(), http_token(), name, NULL, http_authentication::parse, rc, http_transaction::response, and strerror().

http_format_authorization()

static int http_format_authorization ( struct http_transaction *  http, char *  buf, size_t  len  )

static

Construct HTTP "Authorization" header.

Parameters

http	HTTP transaction
buf	Buffer
len	Length of buffer

Return values

len	Length of header value, or negative error

Definition at line 117 of file httpauth.c.

                                                               {
        struct http_authentication *auth = http->request.auth.auth;
        size_t used;
        int auth_len;
        int rc;

        /* Do nothing unless we have an authentication scheme */
        if ( ! auth )
                return 0;

        /* Construct header */
        used = snprintf ( buf, len, "%s ", auth->name );
        auth_len = auth->format ( http, ( buf + used ),
                                  ( ( used < len ) ? ( len - used ) : 0 ) );
        if ( auth_len < 0 ) {
                rc = auth_len;
                return rc;
        }
        used += auth_len;

        return used;
}

References http_request_auth::auth, http_request::auth, http_authentication::format, len, http_authentication::name, rc, http_transaction::request, and snprintf().

Variable Documentation

__http_response_header

struct http_response_header http_response_www_authenticate __http_response_header

Initial value:

= {
        .name = "WWW-Authenticate",
        .parse = http_parse_www_authenticate,
}

HTTP "WWW-Authenticate" header.

Definition at line 104 of file httpauth.c.

__http_request_header

struct http_request_header http_request_authorization __http_request_header

Initial value:

= {
        .name = "Authorization",
        .format = http_format_authorization,
}

HTTP "Authorization" header.

Definition at line 142 of file httpauth.c.