ref: 56e71d5260182e2ac32e09767b7c9440048a1d2f
dir: /sys/src/cmd/ip/httpd/authorize.c/
#include <u.h> #include <libc.h> #include <auth.h> #include "httpd.h" #include "httpsrv.h" static char* readfile(char*); /* * these should be done better; see the response codes in /lib/rfc/rfc2616 for * more info on what should be included. */ #define UNAUTHED "You are not authorized to see this area.\n" /* * check for authorization for some parts of the server tree. * the user name supplied with the authorization request is ignored; * instead, we authenticate as the realm's user. * * authorization should be done before opening any files so that * unauthorized users don't get to validate file names. * * returns 1 if authorized, 0 if unauthorized, -1 for io failure. */ int authorize(HConnect *c, char *file) { char *p, *p0; Hio *hout; char *buf; int i, n; char *t[257]; p0 = halloc(c, strlen(file)+STRLEN("/.httplogin")+1); strcpy(p0, file); for(;;){ p = strrchr(p0, '/'); if(p == nil) return hfail(c, HInternal); if(*(p+1) != 0) break; /* ignore trailing '/'s */ *p = 0; } strcpy(p, "/.httplogin"); buf = readfile(p0); if(buf == nil){ return 1; } n = tokenize(buf, t, nelem(t)); if(c->head.authuser != nil && c->head.authpass != 0){ for(i = 1; i+1 < n; i += 2){ if(strcmp(t[i], c->head.authuser) == 0 && strcmp(t[i+1], c->head.authpass) == 0){ free(buf); return 1; } } } hout = &c->hout; hprint(hout, "%s 401 Unauthorized\r\n", hversion); hprint(hout, "Server: Plan9\r\n"); hprint(hout, "Date: %D\r\n", time(nil)); hprint(hout, "WWW-Authenticate: Basic realm=\"%s\"\r\n", t[0]); hprint(hout, "Content-Type: text/html\r\n"); hprint(hout, "Content-Length: %d\r\n", STRLEN(UNAUTHED)); if(c->head.closeit) hprint(hout, "Connection: close\r\n"); else if(!http11(c)) hprint(hout, "Connection: Keep-Alive\r\n"); hprint(hout, "\r\n"); if(strcmp(c->req.meth, "HEAD") != 0) hprint(hout, "%s", UNAUTHED); writelog(c, "Reply: 401 Unauthorized\n"); free(buf); return hflush(hout); } static char* readfile(char *file) { Dir *d; int fd; char *buf; int n, len; fd = open(file, OREAD); if(fd < 0) return nil; d = dirfstat(fd); if(d == nil){ /* shouldn't happen */ close(fd); return nil; } len = d->length; free(d); buf = malloc(len+1); if(buf == 0){ close(fd); return nil; } n = readn(fd, buf, len); close(fd); if(n <= 0){ free(buf); return nil; } buf[n] = '\0'; return buf; }