/* $OpenBSD: user.c,v 1.8 2000/04/24 23:11:14 jakob Exp $ */ /* $NetBSD: user.c,v 1.17 2000/04/14 06:26:55 simonb Exp $ */ /* * Copyright (c) 1999 Alistair G. Crooks. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Alistair G. Crooks. * 4. The name of the author may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "defs.h" #include "usermgmt.h" /* this struct describes a uid range */ typedef struct range_t { int r_from; /* low uid */ int r_to; /* high uid */ } range_t; /* this struct encapsulates the user information */ typedef struct user_t { int u_uid; /* uid of user */ char *u_password; /* encrypted password */ char *u_comment; /* comment field */ int u_homeset; /* home dir has been set */ char *u_home; /* home directory */ char *u_primgrp; /* primary group */ int u_groupc; /* # of secondary groups */ char *u_groupv[NGROUPS_MAX]; /* secondary groups */ char *u_shell; /* user's shell */ char *u_basedir; /* base directory for home */ char *u_expire; /* when password will expire */ int u_inactive; /* inactive */ int u_mkdir; /* make the home directory */ int u_dupuid; /* duplicate uids are allowed */ char *u_skeldir; /* directory for startup files */ unsigned u_rsize; /* size of range array */ unsigned u_rc; /* # of ranges */ range_t *u_rv; /* the ranges */ unsigned u_defrc; /* # of ranges in defaults */ int u_preserve; /* preserve uids on deletion */ } user_t; #define CONFFILE "/etc/usermgmt.conf" #ifndef DEF_GROUP #define DEF_GROUP "users" #endif #ifndef DEF_BASEDIR #define DEF_BASEDIR "/home" #endif #ifndef DEF_SKELDIR #define DEF_SKELDIR "/etc/skel" #endif #ifndef DEF_SHELL #define DEF_SHELL "/bin/csh" #endif #ifndef DEF_COMMENT #define DEF_COMMENT "" #endif #ifndef DEF_LOWUID #define DEF_LOWUID 1000 #endif #ifndef DEF_HIGHUID #define DEF_HIGHUID 60000 #endif #ifndef DEF_INACTIVE #define DEF_INACTIVE 0 #endif #ifndef DEF_EXPIRE #define DEF_EXPIRE (char *) NULL #endif #ifndef WAITSECS #define WAITSECS 10 #endif #ifndef NOBODY_UID #define NOBODY_UID 32767 #endif /* some useful constants */ enum { MaxShellNameLen = 256, MaxFileNameLen = MAXPATHLEN, MaxUserNameLen = 32, MaxFieldNameLen = 32, MaxCommandLen = 2048, MaxEntryLen = 2048, PasswordLength = 13, LowGid = DEF_LOWUID, HighGid = DEF_HIGHUID }; /* Full paths of programs used here */ #define CHOWN "/usr/sbin/chown" #define MKDIR "/bin/mkdir" #define MV "/bin/mv" #define NOLOGIN "/sbin/nologin" #define PAX "/bin/pax" #define RM "/bin/rm" #define UNSET_EXPIRY "Null (unset)" static int verbose = 0; /* if *cpp is non-null, free it, then assign `n' chars of `s' to it */ static void memsave(char **cpp, char *s, size_t n) { if (*cpp != (char *) NULL) { FREE(*cpp); } NEWARRAY(char, *cpp, n + 1, exit(1)); (void) memcpy(*cpp, s, n); (*cpp)[n] = '\0'; } /* a replacement for system(3) */ static int asystem(char *fmt, ...) { va_list vp; char buf[MaxCommandLen]; int ret; va_start(vp, fmt); (void) vsnprintf(buf, sizeof(buf), fmt, vp); va_end(vp); if (verbose) { (void) printf("Command: %s\n", buf); } if ((ret = system(buf)) != 0) { warnx("[Warning] can't system `%s'", buf); } return ret; } /* return 1 if all of `s' is numeric */ static int is_number(char *s) { for ( ; *s ; s++) { if (!isdigit(*s)) { return 0; } } return 1; } /* * check that the effective uid is 0 - called from funcs which will * modify data and config files. */ static void checkeuid(void) { if (geteuid() != 0) { errx(EXIT_FAILURE, "Program must be run as root"); } } /* copy any dot files into the user's home directory */ static int copydotfiles(char *skeldir, int uid, int gid, char *dir) { struct dirent *dp; DIR *dirp; int n; if ((dirp = opendir(skeldir)) == (DIR *) NULL) { warn("can't open source . files dir `%s'", skeldir); return 0; } for (n = 0; (dp = readdir(dirp)) != (struct dirent *) NULL && n == 0 ; ) { if (strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) { continue; } n = 1; } (void) closedir(dirp); if (n == 0) { warnx("No \"dot\" initialisation files found"); } else { (void) asystem("cd %s; %s -rw -pe %s . %s", skeldir, PAX, (verbose) ? "-v" : "", dir); } (void) asystem("%s -R -h %d:%d %s", CHOWN, uid, gid, dir); return n; } /* create a group entry with gid `gid' */ static int creategid(char *group, int gid, char *name) { struct stat st; FILE *from; FILE *to; char buf[MaxEntryLen]; char f[MaxFileNameLen]; int fd; int cc; if (getgrnam(group) != (struct group *) NULL) { warnx("group `%s' already exists", group); return 0; } if ((from = fopen(_PATH_GROUP, "r")) == (FILE *) NULL) { warn("can't create gid for %s: can't open %s", name, _PATH_GROUP); return 0; } if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) { warn("can't lock `%s'", _PATH_GROUP); } (void) fstat(fileno(from), &st); (void) snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP); if ((fd = mkstemp(f)) < 0) { (void) fclose(from); warn("can't create gid: mkstemp failed"); return 0; } if ((to = fdopen(fd, "w")) == (FILE *) NULL) { (void) fclose(from); (void) close(fd); (void) unlink(f); warn("can't create gid: fdopen `%s' failed", f); return 0; } while ((cc = fread(buf, sizeof(char), sizeof(buf), from)) > 0) { if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) { (void) fclose(from); (void) close(fd); (void) unlink(f); warn("can't create gid: short write to `%s'", f); return 0; } } (void) fprintf(to, "%s:*:%d:%s\n", group, gid, name); (void) fclose(from); (void) fclose(to); if (rename(f, _PATH_GROUP) < 0) { warn("can't create gid: can't rename `%s' to `%s'", f, _PATH_GROUP); return 0; } (void) chmod(_PATH_GROUP, st.st_mode & 07777); return 1; } /* modify the group entry with name `group' to be newent */ static int modify_gid(char *group, char *newent) { struct stat st; FILE *from; FILE *to; char buf[MaxEntryLen]; char f[MaxFileNameLen]; char *colon; int groupc; int entc; int fd; int cc; if ((from = fopen(_PATH_GROUP, "r")) == (FILE *) NULL) { warn("can't create gid for %s: can't open %s", group, _PATH_GROUP); return 0; } if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) { warn("can't lock `%s'", _PATH_GROUP); } (void) fstat(fileno(from), &st); (void) snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP); if ((fd = mkstemp(f)) < 0) { (void) fclose(from); warn("can't create gid: mkstemp failed"); return 0; } if ((to = fdopen(fd, "w")) == (FILE *) NULL) { (void) fclose(from); (void) close(fd); (void) unlink(f); warn("can't create gid: fdopen `%s' failed", f); return 0; } groupc = strlen(group); while (fgets(buf, sizeof(buf), from) != NULL) { cc = strlen(buf); if ((colon = strchr(buf, ':')) == NULL) { warn("badly formed entry `%s'", buf); continue; } entc = (int)(colon - buf); if (entc == groupc && strncmp(group, buf, (unsigned) entc) == 0) { if (newent == NULL) { continue; } else { cc = strlen(newent); (void) strlcpy(buf, newent, sizeof(buf)); } } if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) { (void) fclose(from); (void) close(fd); (void) unlink(f); warn("can't create gid: short write to `%s'", f); return 0; } } (void) fclose(from); (void) fclose(to); if (rename(f, _PATH_GROUP) < 0) { warn("can't create gid: can't rename `%s' to `%s'", f, _PATH_GROUP); return 0; } (void) chmod(_PATH_GROUP, st.st_mode & 07777); return 1; } /* return 1 if `login' is a valid login name */ static int valid_login(char *login) { char *cp; for (cp = login ; *cp ; cp++) { if (!isalnum(*cp) && *cp != '.' && *cp != '_' && *cp != '-') { return 0; } } return 1; } /* return 1 if `group' is a valid group name */ static int valid_group(char *group) { char *cp; for (cp = group ; *cp ; cp++) { if (!isalnum(*cp)) { return 0; } } return 1; } /* find the next gid in the range lo .. hi */ static int getnextgid(int *gidp, int lo, int hi) { for (*gidp = lo ; *gidp < hi ; *gidp += 1) { if (getgrgid((gid_t)*gidp) == (struct group *) NULL) { return 1; } } return 0; } #ifdef EXTENSIONS /* save a range of uids */ static int save_range(user_t *up, char *cp) { int from; int to; int i; if (up->u_rsize == 0) { up->u_rsize = 32; NEWARRAY(range_t, up->u_rv, up->u_rsize, return(0)); } else if (up->u_rc == up->u_rsize) { up->u_rsize *= 2; RENEW(range_t, up->u_rv, up->u_rsize, return(0)); } if (up->u_rv && sscanf(cp, "%d..%d", &from, &to) == 2) { for (i = 0 ; i < up->u_rc ; i++) { if (up->u_rv[i].r_from == from && up->u_rv[i].r_to == to) { break; } } if (i == up->u_rc) { up->u_rv[up->u_rc].r_from = from; up->u_rv[up->u_rc].r_to = to; up->u_rc += 1; } } else { warnx("Bad range `%s'", cp); return 0; } return 1; } #endif /* set the defaults in the defaults file */ static int setdefaults(user_t *up) { char template[MaxFileNameLen]; FILE *fp; int ret; int fd; int i; (void) snprintf(template, sizeof(template), "%s.XXXXXX", CONFFILE); if ((fd = mkstemp(template)) < 0) { warnx("can't mkstemp `%s' for writing", CONFFILE); return 0; } if ((fp = fdopen(fd, "w")) == (FILE *) NULL) { warn("can't fdopen `%s' for writing", CONFFILE); return 0; } ret = 1; if (fprintf(fp, "group\t\t%s\n", up->u_primgrp) <= 0 || fprintf(fp, "base_dir\t%s\n", up->u_basedir) <= 0 || fprintf(fp, "skel_dir\t%s\n", up->u_skeldir) <= 0 || fprintf(fp, "shell\t\t%s\n", up->u_shell) <= 0 || fprintf(fp, "inactive\t%d\n", up->u_inactive) <= 0 || fprintf(fp, "expire\t\t%s\n", (up->u_expire == NULL) ? UNSET_EXPIRY : up->u_expire) <= 0) { warn("can't write to `%s'", CONFFILE); ret = 0; } #ifdef EXTENSIONS for (i = (up->u_defrc != up->u_rc) ? up->u_defrc : 0 ; i < up->u_rc ; i++) { if (fprintf(fp, "range\t\t%d..%d\n", up->u_rv[i].r_from, up->u_rv[i].r_to) <= 0) { warn("can't write to `%s'", CONFFILE); ret = 0; } } #endif (void) fclose(fp); if (ret) { ret = ((rename(template, CONFFILE) == 0) && (chmod(CONFFILE, 0644) == 0)); } return ret; } /* read the defaults file */ static void read_defaults(user_t *up) { struct stat st; size_t lineno; size_t len; FILE *fp; char *cp; char *s; memsave(&up->u_primgrp, DEF_GROUP, strlen(DEF_GROUP)); memsave(&up->u_basedir, DEF_BASEDIR, strlen(DEF_BASEDIR)); memsave(&up->u_skeldir, DEF_SKELDIR, strlen(DEF_SKELDIR)); memsave(&up->u_shell, DEF_SHELL, strlen(DEF_SHELL)); memsave(&up->u_comment, DEF_COMMENT, strlen(DEF_COMMENT)); up->u_rsize = 16; NEWARRAY(range_t, up->u_rv, up->u_rsize, exit(1)); up->u_inactive = DEF_INACTIVE; up->u_expire = DEF_EXPIRE; if ((fp = fopen(CONFFILE, "r")) == (FILE *) NULL) { if (stat(CONFFILE, &st) < 0 && !setdefaults(up)) { warn("can't create `%s' defaults file", CONFFILE); } fp = fopen(CONFFILE, "r"); } if (fp != (FILE *) NULL) { while ((s = fparseln(fp, &len, &lineno, NULL, 0)) != NULL) { if (strncmp(s, "group", 5) == 0) { for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) { } memsave(&up->u_primgrp, cp, strlen(cp)); } else if (strncmp(s, "base_dir", 8) == 0) { for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) { } memsave(&up->u_basedir, cp, strlen(cp)); } else if (strncmp(s, "skel_dir", 8) == 0) { for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) { } memsave(&up->u_skeldir, cp, strlen(cp)); } else if (strncmp(s, "shell", 5) == 0) { for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) { } memsave(&up->u_shell, cp, strlen(cp)); } else if (strncmp(s, "inactive", 8) == 0) { for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) { } up->u_inactive = atoi(cp); #ifdef EXTENSIONS } else if (strncmp(s, "range", 5) == 0) { for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) { } (void) save_range(up, cp); #endif #ifdef EXTENSIONS } else if (strncmp(s, "preserve", 8) == 0) { for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) { } up->u_preserve = (strncmp(cp, "true", 4) == 0) ? 1 : (strncmp(cp, "yes", 3) == 0) ? 1 : atoi(cp); #endif } else if (strncmp(s, "expire", 6) == 0) { for (cp = s + 6 ; *cp && isspace(*cp) ; cp++) { } if (strcmp(cp, UNSET_EXPIRY) == 0) { if (up->u_expire) { FREE(up->u_expire); } up->u_expire = NULL; } else { memsave(&up->u_expire, cp, strlen(cp)); } } (void) free(s); } (void) fclose(fp); } if (up->u_rc == 0) { up->u_rv[up->u_rc].r_from = DEF_LOWUID; up->u_rv[up->u_rc].r_to = DEF_HIGHUID; up->u_rc += 1; } up->u_defrc = up->u_rc; } /* return the next valid unused uid */ static int getnextuid(int sync_uid_gid, int *uid, int low_uid, int high_uid) { for (*uid = low_uid ; *uid <= high_uid ; (*uid)++) { if (getpwuid((uid_t)(*uid)) == (struct passwd *) NULL && *uid != NOBODY_UID) { if (sync_uid_gid) { if (getgrgid((gid_t)(*uid)) == (struct group *) NULL) { return 1; } } else { return 1; } } } return 0; } /* add a user */ static int adduser(char *login, user_t *up) { struct group *grp; struct stat st; struct tm tm; time_t expire; char password[PasswordLength + 1]; char home[MaxFileNameLen]; char buf[MaxFileNameLen]; int sync_uid_gid; int masterfd; int ptmpfd; int gid; int cc; int i; if (!valid_login(login)) { errx(EXIT_FAILURE, "`%s' is not a valid login name", login); } if ((masterfd = open(_PATH_MASTERPASSWD, O_RDONLY)) < 0) { err(EXIT_FAILURE, "can't open `%s'", _PATH_MASTERPASSWD); } if (flock(masterfd, LOCK_EX | LOCK_NB) < 0) { err(EXIT_FAILURE, "can't lock `%s'", _PATH_MASTERPASSWD); } pw_init(); if ((ptmpfd = pw_lock(WAITSECS)) < 0) { (void) close(masterfd); err(EXIT_FAILURE, "can't obtain pw_lock"); } while ((cc = read(masterfd, buf, sizeof(buf))) > 0) { if (write(ptmpfd, buf, (size_t)(cc)) != cc) { (void) close(masterfd); (void) close(ptmpfd); (void) pw_abort(); err(EXIT_FAILURE, "short write to /etc/ptmp (not %d chars)", cc); } } /* if no uid was specified, get next one in [low_uid..high_uid] range */ sync_uid_gid = (strcmp(up->u_primgrp, "=uid") == 0); if (up->u_uid == -1) { for (i = 0 ; i < up->u_rc ; i++) { if (getnextuid(sync_uid_gid, &up->u_uid, up->u_rv[i].r_from, up->u_rv[i].r_to)) { break; } } if (i == up->u_rc) { (void) close(ptmpfd); (void) pw_abort(); errx(EXIT_FAILURE, "can't get next uid for %d", up->u_uid); } } /* check uid isn't already allocated */ if (!up->u_dupuid && getpwuid((uid_t)(up->u_uid)) != (struct passwd *) NULL) { (void) close(ptmpfd); (void) pw_abort(); errx(EXIT_FAILURE, "uid %d is already in use", up->u_uid); } /* if -g=uid was specified, check gid is unused */ if (sync_uid_gid) { if (getgrgid((gid_t)(up->u_uid)) != (struct group *) NULL) { (void) close(ptmpfd); (void) pw_abort(); errx(EXIT_FAILURE, "gid %d is already in use", up->u_uid); } gid = up->u_uid; } else if ((grp = getgrnam(up->u_primgrp)) != (struct group *) NULL) { gid = grp->gr_gid; } else if (is_number(up->u_primgrp) && (grp = getgrgid((gid_t)atoi(up->u_primgrp))) != (struct group *) NULL) { gid = grp->gr_gid; } else { (void) close(ptmpfd); (void) pw_abort(); errx(EXIT_FAILURE, "group %s not found", up->u_primgrp); } /* check name isn't already in use */ if (!up->u_dupuid && getpwnam(login) != (struct passwd *) NULL) { (void) close(ptmpfd); (void) pw_abort(); errx(EXIT_FAILURE, "already a `%s' user", login); } if (up->u_homeset) { (void) strlcpy(home, up->u_home, sizeof(home)); } else { /* if home directory hasn't been given, make it up */ (void) snprintf(home, sizeof(home), "%s/%s", up->u_basedir, login); } expire = 0; if (up->u_expire != NULL) { (void) memset(&tm, 0, sizeof(tm)); if (strptime(up->u_expire, "%c", &tm) == NULL) { warnx("invalid time format `%s'", optarg); } else { expire = mktime(&tm); } } password[PasswordLength] = '\0'; if (up->u_password != NULL && strlen(up->u_password) == PasswordLength) { (void) memcpy(password, up->u_password, PasswordLength); } else { (void) memset(password, '*', PasswordLength); if (up->u_password != NULL) { warnx("Password `%s' is invalid: setting it to `%s'", up->u_password, password); } } cc = snprintf(buf, sizeof(buf), "%s:%s:%d:%d::%d:%ld:%s:%s:%s\n", login, password, up->u_uid, gid, up->u_inactive, (long) expire, up->u_comment, home, up->u_shell); if (write(ptmpfd, buf, (size_t) cc) != cc) { (void) close(ptmpfd); (void) pw_abort(); err(EXIT_FAILURE, "can't add `%s'", buf); } if (up->u_mkdir) { if (lstat(home, &st) < 0 && asystem("%s -p %s", MKDIR, home) != 0) { (void) close(ptmpfd); (void) pw_abort(); err(EXIT_FAILURE, "can't mkdir `%s'", home); } (void) copydotfiles(up->u_skeldir, up->u_uid, gid, home); } if (strcmp(up->u_primgrp, "=uid") == 0 && getgrnam(login) == (struct group *) NULL && !creategid(login, gid, login)) { (void) close(ptmpfd); (void) pw_abort(); err(EXIT_FAILURE, "can't create gid %d for login name %s", gid, login); } (void) close(ptmpfd); if (pw_mkdb() < 0) { err(EXIT_FAILURE, "pw_mkdb failed"); } return 1; } /* modify a user */ static int moduser(char *login, char *newlogin, user_t *up) { struct passwd *pwp; struct group *grp; struct tm tm; time_t expire; size_t loginc; size_t colonc; FILE *master; char password[PasswordLength + 1]; char oldhome[MaxFileNameLen]; char home[MaxFileNameLen]; char buf[MaxFileNameLen]; char *colon; int masterfd; int ptmpfd; int gid; int cc; if (!valid_login(newlogin)) { errx(EXIT_FAILURE, "`%s' is not a valid login name", login); } if ((pwp = getpwnam(login)) == (struct passwd *) NULL) { errx(EXIT_FAILURE, "No such user `%s'", login); } if ((masterfd = open(_PATH_MASTERPASSWD, O_RDONLY)) < 0) { err(EXIT_FAILURE, "can't open `%s'", _PATH_MASTERPASSWD); } if (flock(masterfd, LOCK_EX | LOCK_NB) < 0) { err(EXIT_FAILURE, "can't lock `%s'", _PATH_MASTERPASSWD); } pw_init(); if ((ptmpfd = pw_lock(WAITSECS)) < 0) { (void) close(masterfd); err(EXIT_FAILURE, "can't obtain pw_lock"); } if ((master = fdopen(masterfd, "r")) == (FILE *) NULL) { (void) close(masterfd); (void) close(ptmpfd); (void) pw_abort(); err(EXIT_FAILURE, "can't fdopen fd for %s", _PATH_MASTERPASSWD); } if (up != (user_t *) NULL) { if (up->u_mkdir) { (void) strcpy(oldhome, pwp->pw_dir); } if (up->u_uid == -1) { up->u_uid = pwp->pw_uid; } /* if -g=uid was specified, check gid is unused */ if (strcmp(up->u_primgrp, "=uid") == 0) { if (getgrgid((gid_t)(up->u_uid)) != (struct group *) NULL) { (void) close(ptmpfd); (void) pw_abort(); errx(EXIT_FAILURE, "gid %d is already in use", up->u_uid); } gid = up->u_uid; } else if ((grp = getgrnam(up->u_primgrp)) != (struct group *) NULL) { gid = grp->gr_gid; } else if (is_number(up->u_primgrp) && (grp = getgrgid((gid_t)atoi(up->u_primgrp))) != (struct group *) NULL) { gid = grp->gr_gid; } else { (void) close(ptmpfd); (void) pw_abort(); errx(EXIT_FAILURE, "group %s not found", up->u_primgrp); } /* if changing name, check new name isn't already in use */ if (strcmp(login, newlogin) != 0 && getpwnam(newlogin) != (struct passwd *) NULL) { (void) close(ptmpfd); (void) pw_abort(); errx(EXIT_FAILURE, "already a `%s' user", newlogin); } /* if home directory hasn't been given, use the old one */ if (!up->u_homeset) { (void) strcpy(home, pwp->pw_dir); } expire = 0; if (up->u_expire != NULL) { (void) memset(&tm, 0, sizeof(tm)); if (strptime(up->u_expire, "%c", &tm) == NULL) { warnx("invalid time format `%s'", optarg); } else { expire = mktime(&tm); } } password[PasswordLength] = '\0'; if (up->u_password != NULL && strlen(up->u_password) == PasswordLength) { (void) memcpy(password, up->u_password, PasswordLength); } else { (void) memcpy(password, pwp->pw_passwd, PasswordLength); } if (strcmp(up->u_comment, DEF_COMMENT) == 0) { memsave(&up->u_comment, pwp->pw_gecos, strlen(pwp->pw_gecos)); } if (strcmp(up->u_shell, DEF_SHELL) == 0 && strcmp(pwp->pw_shell, DEF_SHELL) != 0) { memsave(&up->u_comment, pwp->pw_shell, strlen(pwp->pw_shell)); } } loginc = strlen(login); while (fgets(buf, sizeof(buf), master) != NULL) { cc = strlen(buf); if ((colon = strchr(buf, ':')) == NULL) { warnx("Malformed entry `%s'. Skipping", buf); continue; } colonc = (size_t)(colon - buf); if (strncmp(login, buf, loginc) == 0 && loginc == colonc) { if (up != (user_t *) NULL) { cc = snprintf(buf, sizeof(buf), "%s:%s:%d:%d::%d:%ld:%s:%s:%s\n", newlogin, password, up->u_uid, gid, up->u_inactive, (long) expire, up->u_comment, home, up->u_shell); if (write(ptmpfd, buf, (size_t) cc) != cc) { (void) close(ptmpfd); (void) pw_abort(); err(EXIT_FAILURE, "can't add `%s'", buf); } } } else if (write(ptmpfd, buf, (size_t)(cc)) != cc) { (void) close(masterfd); (void) close(ptmpfd); (void) pw_abort(); err(EXIT_FAILURE, "short write to /etc/ptmp (not %d chars)", cc); } } if (up != (user_t *) NULL && up->u_mkdir && asystem("%s %s %s", MV, oldhome, home) != 0) { (void) close(ptmpfd); (void) pw_abort(); err(EXIT_FAILURE, "can't move `%s' to `%s'", oldhome, home); } (void) close(ptmpfd); if (pw_mkdb() < 0) { err(EXIT_FAILURE, "pw_mkdb failed"); } return 1; } #ifdef EXTENSIONS /* see if we can find out the user struct */ static struct passwd * find_user_info(char *name) { struct passwd *pwp; if ((pwp = getpwnam(name)) != (struct passwd *) NULL) { return pwp; } if (is_number(name) && (pwp = getpwuid((uid_t)atoi(name))) != (struct passwd *) NULL) { return pwp; } return (struct passwd *) NULL; } #endif #ifdef EXTENSIONS /* see if we can find out the group struct */ static struct group * find_group_info(char *name) { struct group *grp; if ((grp = getgrnam(name)) != (struct group *) NULL) { return grp; } if (is_number(name) && (grp = getgrgid((gid_t)atoi(name))) != (struct group *) NULL) { return grp; } return (struct group *) NULL; } #endif /* print out usage message, and then exit */ void usermgmt_usage(char *prog) { if (strcmp(prog, "useradd") == 0) { (void) fprintf(stderr, "Usage: %s -D [-b basedir] [-e expiry] " "[-f inactive] [-g group] [-r lowuid..highuid] [-s shell]" "\n", prog); (void) fprintf(stderr, "Usage: %s [-G group] [-b basedir] " "[-c comment] [-d homedir] [-e expiry] [-f inactive]\n" "\t[-g group] [-k skeletondir] [-m] [-o] [-p password] " "[-r lowuid..highuid] [-s shell]\n\t[-u uid] [-v] user\n", prog); } else if (strcmp(prog, "usermod") == 0) { (void) fprintf(stderr, "Usage: %s [-G group] [-c comment] " "[-d homedir] [-e expire] [-f inactive] [-g group] " "[-l newname] [-m] [-o] [-p password] [-s shell] [-u uid] " "[-v] user\n", prog); } else if (strcmp(prog, "userdel") == 0) { (void) fprintf(stderr, "Usage: %s -D [-p preserve]\n", prog); (void) fprintf(stderr, "Usage: %s [-p preserve] [-r] [-v] " "user\n", prog); #ifdef EXTENSIONS } else if (strcmp(prog, "userinfo") == 0) { (void) fprintf(stderr, "Usage: %s [-e] [-v] user\n", prog); #endif } else if (strcmp(prog, "groupadd") == 0) { (void) fprintf(stderr, "Usage: %s [-g gid] [-o] [-v] group\n", prog); } else if (strcmp(prog, "groupdel") == 0) { (void) fprintf(stderr, "Usage: %s [-v] group\n", prog); } else if (strcmp(prog, "groupmod") == 0) { (void) fprintf(stderr, "Usage: %s [-g gid] [-o] [-n newname] " "[-v] group\n", prog); } else if (strcmp(prog, "user") == 0 || strcmp(prog, "group") == 0) { (void) fprintf(stderr, "Usage: %s ( add | del | mod " #ifdef EXTENSIONS "| info " #endif ") ...\n", prog); #ifdef EXTENSIONS } else if (strcmp(prog, "groupinfo") == 0) { (void) fprintf(stderr, "Usage: %s [-e] [-v] group\n", prog); #endif } exit(EXIT_FAILURE); /* NOTREACHED */ } #ifdef EXTENSIONS #define ADD_OPT_EXTENSIONS "p:r:v" #else #define ADD_OPT_EXTENSIONS #endif int useradd(int argc, char **argv) { user_t u; int defaultfield; int bigD; int c; int i; (void) memset(&u, 0, sizeof(u)); read_defaults(&u); u.u_uid = -1; defaultfield = bigD = 0; while ((c = getopt(argc, argv, "DG:b:c:d:e:f:g:k:mou:s:" ADD_OPT_EXTENSIONS)) != -1) { switch(c) { case 'D': bigD = 1; break; case 'G': memsave(&u.u_groupv[u.u_groupc++], optarg, strlen(optarg)); break; case 'b': defaultfield = 1; memsave(&u.u_basedir, optarg, strlen(optarg)); break; case 'c': memsave(&u.u_comment, optarg, strlen(optarg)); break; case 'd': u.u_homeset = 1; memsave(&u.u_home, optarg, strlen(optarg)); break; case 'e': defaultfield = 1; memsave(&u.u_expire, optarg, strlen(optarg)); break; case 'f': defaultfield = 1; u.u_inactive = atoi(optarg); break; case 'g': defaultfield = 1; memsave(&u.u_primgrp, optarg, strlen(optarg)); break; case 'k': memsave(&u.u_skeldir, optarg, strlen(optarg)); break; case 'm': u.u_mkdir = 1; break; case 'o': u.u_dupuid = 1; break; #ifdef EXTENSIONS case 'p': memsave(&u.u_password, optarg, strlen(optarg)); break; #endif #ifdef EXTENSIONS case 'r': defaultfield = 1; (void) save_range(&u, optarg); break; #endif case 's': defaultfield = 1; memsave(&u.u_shell, optarg, strlen(optarg)); break; case 'u': if (!is_number(optarg)) { errx(EXIT_FAILURE, "When using [-u uid], the uid must be numeric"); } u.u_uid = atoi(optarg); break; #ifdef EXTENSIONS case 'v': verbose = 1; break; #endif } } if (bigD) { if (defaultfield) { checkeuid(); return setdefaults(&u) ? EXIT_SUCCESS : EXIT_FAILURE; } (void) printf("group\t\t%s\n", u.u_primgrp); (void) printf("base_dir\t%s\n", u.u_basedir); (void) printf("skel_dir\t%s\n", u.u_skeldir); (void) printf("shell\t\t%s\n", u.u_shell); (void) printf("inactive\t%d\n", u.u_inactive); (void) printf("expire\t\t%s\n", (u.u_expire == NULL) ? UNSET_EXPIRY : u.u_expire); #ifdef EXTENSIONS for (i = 0 ; i < u.u_rc ; i++) { (void) printf("range\t\t%d..%d\n", u.u_rv[i].r_from, u.u_rv[i].r_to); } #endif return EXIT_SUCCESS; } if (argc == optind) { usermgmt_usage("useradd"); } checkeuid(); return adduser(argv[optind], &u) ? EXIT_SUCCESS : EXIT_FAILURE; } #ifdef EXTENSIONS #define MOD_OPT_EXTENSIONS "p:v" #else #define MOD_OPT_EXTENSIONS #endif int usermod(int argc, char **argv) { user_t u; char newuser[MaxUserNameLen + 1]; int have_new_user; int c; (void) memset(&u, 0, sizeof(u)); (void) memset(newuser, 0, sizeof(newuser)); read_defaults(&u); u.u_uid = -1; have_new_user = 0; while ((c = getopt(argc, argv, "G:c:d:e:f:g:l:mos:u:" MOD_OPT_EXTENSIONS)) != -1) { switch(c) { case 'G': memsave(&u.u_groupv[u.u_groupc++], optarg, strlen(optarg)); break; case 'c': memsave(&u.u_comment, optarg, strlen(optarg)); break; case 'd': u.u_homeset = 1; memsave(&u.u_home, optarg, strlen(optarg)); break; case 'e': memsave(&u.u_expire, optarg, strlen(optarg)); break; case 'f': u.u_inactive = atoi(optarg); break; case 'g': memsave(&u.u_primgrp, optarg, strlen(optarg)); break; case 'l': have_new_user = 1; (void) strlcpy(newuser, optarg, sizeof(newuser)); break; case 'm': u.u_mkdir = 1; break; case 'o': u.u_dupuid = 1; break; #ifdef EXTENSIONS case 'p': memsave(&u.u_password, optarg, strlen(optarg)); break; #endif case 's': memsave(&u.u_shell, optarg, strlen(optarg)); break; case 'u': if (!is_number(optarg)) { errx(EXIT_FAILURE, "When using [-u uid], the uid must be numeric"); } u.u_uid = atoi(optarg); break; #ifdef EXTENSIONS case 'v': verbose = 1; break; #endif } } if (argc == optind) { usermgmt_usage("usermod"); } checkeuid(); return moduser(argv[optind], (have_new_user) ? newuser : argv[optind], &u) ? EXIT_SUCCESS : EXIT_FAILURE; } #ifdef EXTENSIONS #define DEL_OPT_EXTENSIONS "Dp:v" #else #define DEL_OPT_EXTENSIONS #endif int userdel(int argc, char **argv) { struct passwd *pwp; struct stat st; user_t u; char password[PasswordLength + 1]; int defaultfield; int rmhome; int bigD; int c; (void) memset(&u, 0, sizeof(u)); read_defaults(&u); defaultfield = bigD = rmhome = 0; while ((c = getopt(argc, argv, "r" DEL_OPT_EXTENSIONS)) != -1) { switch(c) { #ifdef EXTENSIONS case 'D': bigD = 1; break; #endif #ifdef EXTENSIONS case 'p': defaultfield = 1; u.u_preserve = (strcmp(optarg, "true") == 0) ? 1 : (strcmp(optarg, "yes") == 0) ? 1 : atoi(optarg); break; #endif case 'r': rmhome = 1; break; #ifdef EXTENSIONS case 'v': verbose = 1; break; #endif } } #ifdef EXTENSIONS if (bigD) { if (defaultfield) { checkeuid(); return setdefaults(&u) ? EXIT_SUCCESS : EXIT_FAILURE; } (void) printf("preserve\t%s\n", (u.u_preserve) ? "true" : "false"); return EXIT_SUCCESS; } #endif if (argc == optind) { usermgmt_usage("userdel"); } checkeuid(); if ((pwp = getpwnam(argv[optind])) == (struct passwd *) NULL) { warnx("No such user `%s'", argv[optind]); return EXIT_FAILURE; } if (rmhome) { if (stat(pwp->pw_dir, &st) < 0) { warn("Home directory `%s' does not exist", pwp->pw_dir); return EXIT_FAILURE; } (void) asystem("%s -rf %s", RM, pwp->pw_dir); } if (u.u_preserve) { memsave(&u.u_shell, NOLOGIN, strlen(NOLOGIN)); (void) memset(password, '*', PasswordLength); password[PasswordLength] = '\0'; memsave(&u.u_password, password, PasswordLength); return moduser(argv[optind], argv[optind], &u) ? EXIT_SUCCESS : EXIT_FAILURE; } return moduser(argv[optind], argv[optind], (user_t *) NULL) ? EXIT_SUCCESS : EXIT_FAILURE; } #ifdef EXTENSIONS #define GROUP_ADD_OPT_EXTENSIONS "v" #else #define GROUP_ADD_OPT_EXTENSIONS #endif /* add a group */ int groupadd(int argc, char **argv) { int dupgid; int gid; int c; gid = -1; dupgid = 0; while ((c = getopt(argc, argv, "g:o" GROUP_ADD_OPT_EXTENSIONS)) != -1) { switch(c) { case 'g': if (!is_number(optarg)) { errx(EXIT_FAILURE, "When using [-g gid], the gid must be numeric"); } gid = atoi(optarg); break; case 'o': dupgid = 1; break; #ifdef EXTENSIONS case 'v': verbose = 1; break; #endif } } if (argc == optind) { usermgmt_usage("groupadd"); } checkeuid(); if (gid < 0 && !getnextgid(&gid, LowGid, HighGid)) { err(EXIT_FAILURE, "can't add group: can't get next gid"); } if (!dupgid && getgrgid((gid_t) gid) != (struct group *) NULL) { errx(EXIT_FAILURE, "can't add group: gid %d is a duplicate", gid); } if (!valid_group(argv[optind])) { warnx("warning - invalid group name `%s'", argv[optind]); } if (!creategid(argv[optind], gid, "")) { err(EXIT_FAILURE, "can't add group: problems with %s file", _PATH_GROUP); } return EXIT_SUCCESS; } #ifdef EXTENSIONS #define GROUP_DEL_OPT_EXTENSIONS "v" #else #define GROUP_DEL_OPT_EXTENSIONS #endif /* remove a group */ int groupdel(int argc, char **argv) { int c; while ((c = getopt(argc, argv, "" GROUP_DEL_OPT_EXTENSIONS)) != -1) { switch(c) { #ifdef EXTENSIONS case 'v': verbose = 1; break; #endif } } if (argc == optind) { usermgmt_usage("groupdel"); } checkeuid(); if (!modify_gid(argv[optind], NULL)) { err(EXIT_FAILURE, "can't change %s file", _PATH_GROUP); } return EXIT_SUCCESS; } #ifdef EXTENSIONS #define GROUP_MOD_OPT_EXTENSIONS "v" #else #define GROUP_MOD_OPT_EXTENSIONS #endif /* modify a group */ int groupmod(int argc, char **argv) { struct group *grp; char buf[MaxEntryLen]; char *newname; char **cpp; int dupgid; int gid; int cc; int c; gid = -1; dupgid = 0; newname = NULL; while ((c = getopt(argc, argv, "g:on:" GROUP_MOD_OPT_EXTENSIONS)) != -1) { switch(c) { case 'g': if (!is_number(optarg)) { errx(EXIT_FAILURE, "When using [-g gid], the gid must be numeric"); } gid = atoi(optarg); break; case 'o': dupgid = 1; break; case 'n': memsave(&newname, optarg, strlen(optarg)); break; #ifdef EXTENSIONS case 'v': verbose = 1; break; #endif } } if (argc == optind) { usermgmt_usage("groupmod"); } checkeuid(); if (gid < 0 && newname == NULL) { err(EXIT_FAILURE, "Nothing to change"); } if (dupgid && gid < 0) { err(EXIT_FAILURE, "Duplicate which gid?"); } if ((grp = getgrnam(argv[optind])) == (struct group *) NULL) { err(EXIT_FAILURE, "can't find group `%s' to modify", argv[optind]); } if (newname != NULL && !valid_group(newname)) { warn("warning - invalid group name `%s'", newname); } cc = snprintf(buf, sizeof(buf), "%s:%s:%d:", (newname) ? newname : grp->gr_name, grp->gr_passwd, (gid < 0) ? grp->gr_gid : gid); for (cpp = grp->gr_mem ; *cpp && cc < sizeof(buf) ; cpp++) { cc += snprintf(&buf[cc], sizeof(buf) - cc, "%s%s", *cpp, (cpp[1] == NULL) ? "" : ","); } if (!modify_gid(argv[optind], buf)) { err(EXIT_FAILURE, "can't change %s file", _PATH_GROUP); } return EXIT_SUCCESS; } #ifdef EXTENSIONS /* display user information */ int userinfo(int argc, char **argv) { struct passwd *pwp; struct group *grp; char buf[MaxEntryLen]; char **cpp; int exists; int cc; int i; exists = 0; while ((i = getopt(argc, argv, "ev")) != -1) { switch(i) { case 'e': exists = 1; break; case 'v': verbose = 1; break; } } if (argc == optind) { usermgmt_usage("userinfo"); } pwp = find_user_info(argv[optind]); if (exists) { exit((pwp) ? EXIT_SUCCESS : EXIT_FAILURE); } if (pwp == (struct passwd *) NULL) { errx(EXIT_FAILURE, "can't find user `%s'", argv[optind]); } (void) printf("login\t%s\n", pwp->pw_name); (void) printf("passwd\t%s\n", pwp->pw_passwd); (void) printf("uid\t%d\n", pwp->pw_uid); for (cc = 0 ; (grp = getgrent()) != (struct group *) NULL ; ) { for (cpp = grp->gr_mem ; *cpp ; cpp++) { if (strcmp(*cpp, argv[optind]) == 0 && grp->gr_gid != pwp->pw_gid) { cc += snprintf(&buf[cc], sizeof(buf) - cc, "%s ", grp->gr_name); } } } if ((grp = getgrgid(pwp->pw_gid)) == (struct group *) NULL) { (void) printf("groups\t%d %s\n", pwp->pw_gid, buf); } else { (void) printf("groups\t%s %s\n", grp->gr_name, buf); } (void) printf("change\t%s", ctime(&pwp->pw_change)); (void) printf("class\t%s\n", pwp->pw_class); (void) printf("gecos\t%s\n", pwp->pw_gecos); (void) printf("dir\t%s\n", pwp->pw_dir); (void) printf("shell\t%s\n", pwp->pw_shell); (void) printf("expire\t%s", ctime(&pwp->pw_expire)); return EXIT_SUCCESS; } #endif #ifdef EXTENSIONS /* display user information */ int groupinfo(int argc, char **argv) { struct group *grp; char **cpp; int exists; int i; exists = 0; while ((i = getopt(argc, argv, "ev")) != -1) { switch(i) { case 'e': exists = 1; break; case 'v': verbose = 1; break; } } if (argc == optind) { usermgmt_usage("groupinfo"); } grp = find_group_info(argv[optind]); if (exists) { exit((grp) ? EXIT_SUCCESS : EXIT_FAILURE); } if (grp == (struct group *) NULL) { errx(EXIT_FAILURE, "can't find group `%s'", argv[optind]); } (void) printf("name\t%s\n", grp->gr_name); (void) printf("passwd\t%s\n", grp->gr_passwd); (void) printf("gid\t%d\n", grp->gr_gid); (void) printf("members\t"); for (cpp = grp->gr_mem ; *cpp ; cpp++) { (void) printf("%s ", *cpp); } (void) fputc('\n', stdout); return EXIT_SUCCESS; } #endif