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@ -20,24 +20,47 @@ |
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#include "opts.h" |
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#include "utils.h" |
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/* lenght of "gemini://" */ |
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#define GEMINI_PART 9 |
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/* 2014 + 1
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* see https://gemini.circumlunar.space/docs/specification.html.
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/*
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* number of bytes to read with fgets() : 2014 + 1 |
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* fgets() reads at most size-1 (1024 here) |
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* see https://gemini.circumlunar.space/docs/specification.html.
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*/ |
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#define GEMINI_REQUEST_MAX 1025 |
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int virtualhost; |
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void autoindex(const char *); |
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void cgi(const char *cgicmd); |
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void display_file(const char *); |
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void drop_privileges(const char *, const char *); |
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void echdir(const char *); |
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void status(const int, const char *); |
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void status_redirect(const int, const char *); |
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void status_error(const int, const char*); |
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void drop_privileges(const char *, const char *); |
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int uridecode(char *); |
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void |
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echdir(const char *path) |
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{ |
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if (chdir(path) == -1) { |
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switch (errno) { |
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case ENOTDIR: /* FALLTHROUGH */ |
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case ENOENT: |
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status_error(51, "file not found"); |
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break; |
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case EACCES: |
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status_error(50, "Forbidden path"); |
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break; |
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default: |
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status_error(50, "Internal server error"); |
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break; |
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} |
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errlog("failed to chdir(%s)", path); |
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} |
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} |
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int |
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uridecode(char *uri) |
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{ |
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@ -78,7 +101,6 @@ void |
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drop_privileges(const char *user, const char *path) |
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{ |
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struct passwd *pw; |
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int chrooted = 0; |
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/*
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* use chroot() if an user is specified requires root user to be |
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@ -99,9 +121,7 @@ drop_privileges(const char *user, const char *path) |
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errlog("the chroot_dir %s can't be used for chroot", path); |
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} |
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chrooted = 1; |
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if (chdir("/") == -1) { |
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errlog("failed to chdir(\"/\")"); |
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} |
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echdir("/"); |
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/* drop privileges */ |
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if (setgroups(1, &pw->pw_gid) || |
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setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || |
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@ -110,8 +130,6 @@ drop_privileges(const char *user, const char *path) |
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user, pw->pw_uid); |
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} |
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/* base directory is now / */ |
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estrlcpy(chroot_dir, "/", sizeof(chroot_dir)); |
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} |
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#ifdef __OpenBSD__ |
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/*
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@ -122,25 +140,17 @@ drop_privileges(const char *user, const char *path) |
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} else { |
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eunveil(path, "r"); |
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} |
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/* permission to execute what's inside cgipath */ |
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if (strlen(cgibin) > 0) { |
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/* first, build the full path of cgi (not in chroot) */ |
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char cgifullpath[PATH_MAX] = {'\0'}; |
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estrlcpy(cgifullpath, path, sizeof(cgifullpath)); |
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estrlcat(cgifullpath, cgibin, sizeof(cgifullpath)); |
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eunveil(cgifullpath, "rx"); |
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/* permission to execute what's inside cgidir */ |
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if (strlen(cgidir) > 0) { |
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eunveil(cgidir, "rx"); |
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} |
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eunveil(NULL,NULL); /* no more call to unveil() */ |
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/*
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* prevent system calls other parsing queryfor fread file and |
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* write to stdio |
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*/ |
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if (strlen(cgibin) > 0) { |
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/* cgi need execlp() (exec) */ |
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/* promise permissions */ |
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if (strlen(cgidir) > 0) { |
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epledge("stdio rpath exec", NULL); |
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} else { |
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epledge("stdio rpath", NULL); |
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epledge("stdio rpath unveil", NULL); |
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} |
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#endif |
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} |
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@ -148,8 +158,11 @@ drop_privileges(const char *user, const char *path) |
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void |
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status(const int code, const char *file_mime) |
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{ |
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printf("%i %s; %s\r\n", |
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code, file_mime, lang); |
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if (strcmp(file_mime, "text/gemini") == 0) { |
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printf("%i %s; %s\r\n", code, file_mime, lang); |
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} else { |
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printf("%i %s\r\n", code, file_mime); |
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} |
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} |
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void |
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@ -167,7 +180,7 @@ status_error(const int code, const char *reason) |
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} |
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void |
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display_file(const char *uri) |
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display_file(const char *fname) |
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{ |
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FILE *fd = NULL; |
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struct stat sb = {0}; |
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@ -175,19 +188,28 @@ display_file(const char *uri) |
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const char *file_mime; |
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char *buffer[BUFSIZ]; |
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char target[FILENAME_MAX] = {'\0'}; |
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char fp[PATH_MAX] = {'\0'}; |
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char tmp[PATH_MAX] = {'\0'}; /* used to build temporary path */ |
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/* build file path inside chroot */ |
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estrlcpy(fp, chroot_dir, sizeof(fp)); |
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estrlcat(fp, uri, sizeof(fp)); |
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/* special case : fname empty. The user requested just the directory name */ |
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if (strlen(fname) == 0) { |
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if (stat("index.gmi", &sb) == 0) { |
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/* there is index.gmi in the current directory */ |
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display_file("index.gmi"); |
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return; |
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} else if (doautoidx) { |
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/* no index.gmi, so display autoindex if enabled */ |
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autoindex("."); |
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return; |
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} else { |
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goto err; |
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} |
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} |
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/* this is to check if path exists and obtain metadata later */ |
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if (stat(fp, &sb) == -1) { |
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/* check if fp is a symbolic link
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if (stat(fname, &sb) == -1) { |
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/* check if fname is a symbolic link
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* if so, redirect using its target */ |
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if (lstat(fp, &sb) != -1 && S_ISLNK(sb.st_mode) == 1) |
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if (lstat(fname, &sb) != -1 && S_ISLNK(sb.st_mode) == 1) |
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goto redirect; |
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else |
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goto err; |
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@ -195,61 +217,42 @@ display_file(const char *uri) |
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/* check if directory */ |
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if (S_ISDIR(sb.st_mode) != 0) { |
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if (fp[strlen(fp) -1 ] != '/') { |
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/* no ending "/", redirect to "path/" */ |
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if (virtualhost) |
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estrlcat(tmp, "gemini://", sizeof(tmp)); |
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estrlcat(tmp, uri, sizeof(tmp)); |
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estrlcat(tmp, "/", sizeof(tmp)); |
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status_redirect(31, tmp); |
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return; |
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} else { |
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/* there is a leading "/", display index.gmi */ |
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estrlcpy(tmp, fp, sizeof(tmp)); |
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estrlcat(tmp, "index.gmi", sizeof(tmp)); |
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/* check if index.gmi exists or show autoindex */ |
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if (stat(tmp, &sb) == 0) { |
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estrlcpy(fp, tmp, sizeof(fp)); |
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} else if (doautoidx != 0) { |
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autoindex(fp); |
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return; |
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} else { |
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goto err; |
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} |
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} |
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/* no ending "/", redirect to "fname/" */ |
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estrlcpy(tmp, fname, sizeof(tmp)); |
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estrlcat(tmp, "/", sizeof(tmp)); |
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status_redirect(31, tmp); |
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return; |
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} |
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/* open the file requested */ |
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if ((fd = fopen(fp, "r")) == NULL) { goto err; } |
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if ((fd = fopen(fname, "r")) == NULL) { goto err; } |
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file_mime = get_file_mime(fp, default_mime); |
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file_mime = get_file_mime(fname, default_mime); |
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status(20, file_mime); |
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/* read the file byte after byte in buffer and write it to stdout */ |
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while ((nread = fread(buffer, 1, sizeof(buffer), fd)) != 0) |
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fwrite(buffer, 1, nread, stdout); |
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goto closefd; |
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syslog(LOG_DAEMON, "path served %s", fp); |
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goto closefd; /* close file descriptor */ |
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syslog(LOG_DAEMON, "path served %s", fname); |
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return; |
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err: |
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/* return an error code and no content */ |
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status_error(51, "file not found"); |
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syslog(LOG_DAEMON, "path invalid %s", fp); |
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syslog(LOG_DAEMON, "path invalid %s", fname); |
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goto closefd; |
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redirect: |
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/* read symbolic link target to redirect */ |
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if (readlink(fp, target, FILENAME_MAX) == -1) { |
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if (readlink(fname, target, FILENAME_MAX) == -1) { |
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goto err; |
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} |
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status_redirect(30, target); |
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syslog(LOG_DAEMON, "redirection from %s to %s", fp, target); |
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syslog(LOG_DAEMON, "redirection from %s to %s", fname, target); |
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closefd: |
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if (S_ISREG(sb.st_mode) != 0) { |
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@ -260,33 +263,20 @@ closefd: |
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void |
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autoindex(const char *path) |
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{ |
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/* display liks to files in path + a link to parent (..) */ |
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int n = 0; |
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char *pos = NULL; |
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struct dirent **namelist; /* this must be freed at last */ |
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syslog(LOG_DAEMON, "autoindex: %s", path); |
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/* display link to parent */ |
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char parent[PATH_MAX] = {'\0'}; |
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/* parent is "path" without chroot_dir */ |
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estrlcpy(parent, path+strlen(chroot_dir), sizeof(parent)); |
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/* remove ending '/' */ |
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while (parent[strlen(parent)-1] == '/') { |
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parent[strlen(parent)-1] = '\0'; |
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} |
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/* remove last part after '/' */ |
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pos = strrchr(parent, '/'); |
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if (pos != NULL) { |
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pos[1] = '\0'; /* at worse, parent is now "/" */ |
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} |
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/* use alphasort to always have the same order on every system */ |
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if ((n = scandir(path, &namelist, NULL, alphasort)) < 0) { |
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status_error(50, "Internal server error"); |
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errlog("Can't scan %s", path); |
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} else { |
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status(20, "text/gemini"); |
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printf("=> %s ../\n", parent); |
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printf("=> .. ../\n"); /* display link to parent */ |
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for(int j = 0; j < n; j++) { |
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/* skip self and parent */ |
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if ((strcmp(namelist[j]->d_name, ".") == 0) || |
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@ -308,6 +298,7 @@ autoindex(const char *path) |
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void |
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cgi(const char *cgicmd) |
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{ |
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/* run cgicmd replacing current process */ |
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execlp(cgicmd, cgicmd, NULL); |
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/* if execlp is ok, this will never be reached */ |
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status(42, "Couldn't execute CGI script"); |
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@ -318,13 +309,27 @@ cgi(const char *cgicmd) |
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int |
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main(int argc, char **argv) |
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{ |
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char request [GEMINI_REQUEST_MAX] = {'\0'}; |
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char hostname [GEMINI_REQUEST_MAX] = {'\0'}; |
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char uri [PATH_MAX] = {'\0'}; |
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char user [_SC_LOGIN_NAME_MAX] = ""; |
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char query[PATH_MAX] = {'\0'}; |
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int option = 0; |
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char *pos = NULL; |
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char request [GEMINI_REQUEST_MAX] = {'\0'}; |
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char user [_SC_LOGIN_NAME_MAX] = ""; |
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char hostname [GEMINI_REQUEST_MAX] = {'\0'}; |
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char query [PATH_MAX] = {'\0'}; |
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char chroot_dir[PATH_MAX] = DEFAULT_CHROOT; |
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char file [FILENAME_MAX] = DEFAULT_INDEX; |
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char dir [PATH_MAX] = {'\0'}; |
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char *pos = NULL; |
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int option = 0; |
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int virtualhost = 0; |
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int docgi = 0; |
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/*
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* request : contain the whole request from client : gemini://...\r\n
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* user : username, used in drop_privileges() |
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* hostname : extracted from hostname. used with virtualhosts and cgi SERVER_NAME |
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* query : file requested in cgi : gemini://...?query
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* file : file basename to display. Emtpy is a directory has been requested |
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* dir : directory requested. vger will chdir() in to find file |
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* pos : used to parse request and split into interesting parts |
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*/ |
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while ((option = getopt(argc, argv, ":d:l:m:u:c:vi")) != -1) { |
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switch (option) { |
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@ -342,7 +347,8 @@ main(int argc, char **argv) |
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estrlcpy(user, optarg, sizeof(user)); |
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break; |
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case 'c': |
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estrlcpy(cgibin, optarg, sizeof(cgibin)); |
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estrlcpy(cgidir, optarg, sizeof(cgidir)); |
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docgi = 1; |
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break; |
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case 'v': |
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virtualhost = 1; |
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@ -354,13 +360,14 @@ main(int argc, char **argv) |
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} |
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/*
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* do chroot if an user is supplied run pledge/unveil if OpenBSD |
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* do chroot if an user is supplied |
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*/ |
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drop_privileges(user, chroot_dir); |
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/*
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* read 1024 chars from stdin |
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* to get the request |
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* (actually 1024 + \0) |
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*/ |
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if (fgets(request, GEMINI_REQUEST_MAX, stdin) == NULL) { |
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/* EOF reached before reading anything */ |
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@ -405,67 +412,90 @@ main(int argc, char **argv) |
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memmove(request, pos+3, strlen(pos) +1 - 3); /* "/.." = 3 */ |
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} |
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/*
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* look for the first / after the hostname |
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* in order to split hostname and uri |
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*/ |
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pos = strchr(request, '/'); |
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echdir(chroot_dir); /* move to chroot */ |
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/* look for hostname in request : first thing before first / if any */ |
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pos = strchr(request, '/'); |
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if (pos != NULL) { |
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/* if there is a / found */ |
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/* separate hostname and uri */ |
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estrlcpy(uri, pos, strlen(pos)+1); |
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/* just keep hostname in request */ |
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/* copy what's after hostname in dir */ |
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estrlcpy(dir, pos, strlen(pos)+1); |
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/* just keep hostname in request : stop the string with \0 */ |
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pos[0] = '\0'; |
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} |
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/* check if client added :port at end of request */ |
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/* check if client added :port at end of hostname and remove it */ |
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pos = strchr(request, ':'); |
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if (pos != NULL) { |
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/* end string at :*/ |
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pos[0] = '\0'; |
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/* end string at :*/ |
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pos[0] = '\0'; |
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} |
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/* copy hostname from request */ |
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estrlcpy(hostname, request, sizeof(hostname)); |
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/* look for "?" if any to set query for cgi, or remove it*/ |
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pos = strchr(uri, '?'); |
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if (pos != NULL) { |
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estrlcpy(query, pos+1, sizeof(query)); |
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esetenv("QUERY_STRING", query, 1); |
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pos[0] = '\0'; |
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/* remove leading '/' in dir */ |
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while (dir[0] == '/') { |
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memmove(dir, dir+1, strlen(dir+1)+1); |
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} |
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/*
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* if virtualhost feature is actived looking under the chroot_path + |
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* hostname directory gemini://foobar/hello will look for
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* chroot_path/foobar/hello |
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*/ |
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if (virtualhost) { |
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if (strlen(uri) == 0) { |
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estrlcpy(uri, "/index.gmi", sizeof(uri)); |
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} |
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/* add hostname at the beginning of the dir path */ |
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char tmp[PATH_MAX] = {'\0'}; |
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estrlcpy(tmp, hostname, sizeof(tmp)); |
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estrlcat(tmp, uri, sizeof(tmp)); |
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estrlcpy(uri, tmp, sizeof(uri)); |
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estrlcat(tmp, "/", sizeof(tmp)); |
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estrlcat(tmp, dir, sizeof(tmp)); |
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estrlcpy(dir, tmp, sizeof(dir)); |
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} |
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/* check if uri is cgibin */ |
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if ((strlen(cgibin) > 0) && |
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(strncmp(uri, cgibin, strlen(cgibin)) == 0)) { |
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/* percent decode */ |
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uridecode(dir); |
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/*
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* split dir and filename. |
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* file is last part after last '/'. |
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* if none found, then requested file is actually a directory |
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*/ |
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if (strlen(dir) > 0) { |
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pos = strrchr(dir, '/'); |
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if (pos != NULL) { |
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estrlcpy(file, pos+1, sizeof(file)); /* +1 : no leading '/' */ |
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pos[0] = '\0'; |
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if (strlen(dir) > 0) { |
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echdir(dir); /* change directory to requested directory */ |
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} |
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} else { |
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estrlcpy(file, dir, sizeof(file)); |
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} |
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} |
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/* cgipath with chroot_dir at the beginning */ |
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char cgipath[PATH_MAX] = {'\0'}; |
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estrlcpy(cgipath, chroot_dir, sizeof(cgipath)); |
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estrlcat(cgipath, uri, sizeof(cgipath)); |
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if (docgi) { |
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/* check if directory is cgidir */ |
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char cgifp[PATH_MAX] = {'\0'}; |
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estrlcpy(cgifp, chroot_dir, sizeof(chroot_dir)); |
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if (cgifp[strlen(cgifp)-1] != '/') { |
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estrlcat(cgifp, "/", sizeof(chroot_dir)); |
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} |
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estrlcat(cgifp, dir, sizeof(chroot_dir)); |
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if (strcmp(cgifp, cgidir) != 0) { |
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/* not cgipath, display file content */ |
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goto file_to_stdout; |
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} |
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/* set env variables for CGI */ |
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|
/* see https://lists.orbitalfox.eu/archives/gemini/2020/000315.html */ |
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esetenv("GATEWAY_INTERFACE", "CGI/1.1", 1); |
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esetenv("SERVER_PROTOCOL", "GEMINI", 1); |
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esetenv("SERVER_SOFTWARE", "vger/1", 1); |
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/* look for "?" if any to set query for cgi, remove it*/ |
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pos = strchr(file, '?'); |
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if (pos != NULL) { |
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estrlcpy(query, pos+1, sizeof(query)); |
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esetenv("QUERY_STRING", query, 1); |
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pos[0] = '\0'; |
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} |
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|
/* look for an extension to find PATH_INFO */ |
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|
pos = strrchr(cgipath, '.'); |
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|
pos = strrchr(file, '.'); |
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|
|
if (pos != NULL) { |
|
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|
|
/* found a dot */ |
|
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|
|
pos = strchr(pos, '/'); |
|
|
|
@ -474,16 +504,16 @@ main(int argc, char **argv) |
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|
|
pos[0] = '\0'; /* keep only script name */ |
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|
} |
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|
} |
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|
|
esetenv("SCRIPT_NAME", cgipath, 1); |
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|
|
esetenv("SCRIPT_NAME", file, 1); |
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|
esetenv("SERVER_NAME", hostname, 1); |
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|
cgi(cgipath); |
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|
|
} else { |
|
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|
|
uridecode(uri); |
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|
|
/* open file and send it to stdout */ |
|
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|
|
display_file(uri); |
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|
|
cgi(file); |
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|
return 0; |
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|
|
} |
|
|
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|
|
file_to_stdout: |
|
|
|
|
/* regular file to stdout */ |
|
|
|
|
display_file(file); |
|
|
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|
|
return (0); |
|
|
|
|
} |
|
|
|
|