| 1 | /* |
| 2 | ** Copyright 2001-2006 Double Precision, Inc. See COPYING for |
| 3 | ** distribution information. |
| 4 | */ |
| 5 | |
| 6 | #if HAVE_CONFIG_H |
| 7 | #include "courier_auth_config.h" |
| 8 | #endif |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <string.h> |
| 12 | #include <signal.h> |
| 13 | #include <errno.h> |
| 14 | #if HAVE_UNISTD_H |
| 15 | #include <unistd.h> |
| 16 | #endif |
| 17 | #include <pwd.h> |
| 18 | #include <sys/types.h> |
| 19 | #include <fcntl.h> |
| 20 | #include "auth.h" |
| 21 | #include "authwait.h" |
| 22 | #include "authchangepwdir.h" |
| 23 | #include "numlib/numlib.h" |
| 24 | |
| 25 | static const char rcsid[]="$Id: authsyschangepwd.c,v 1.10 2006/06/01 10:47:33 mrsam Exp $"; |
| 26 | |
| 27 | static int dochangepwd(struct passwd *, const char *, const char *); |
| 28 | |
| 29 | int auth_syspasswd(const char *service, /* Ignored */ |
| 30 | const char *userid, /* Generally ignored */ |
| 31 | const char *oldpwd, /* Old password */ |
| 32 | const char *newpwd) /* New password */ |
| 33 | { |
| 34 | char *cpy=strdup(userid); |
| 35 | struct passwd *pwd; |
| 36 | int rc; |
| 37 | |
| 38 | if (!cpy) |
| 39 | { |
| 40 | perror("malloc"); |
| 41 | errno=EPERM; |
| 42 | return (-1); |
| 43 | } |
| 44 | |
| 45 | if (strchr(cpy, '@')) |
| 46 | { |
| 47 | free(cpy); |
| 48 | errno=EINVAL; |
| 49 | return (-1); |
| 50 | } |
| 51 | |
| 52 | pwd=getpwnam(cpy); |
| 53 | |
| 54 | if (!pwd) |
| 55 | { |
| 56 | free(cpy); |
| 57 | errno=EINVAL; |
| 58 | return (-1); |
| 59 | } |
| 60 | |
| 61 | rc=dochangepwd(pwd, oldpwd, newpwd); |
| 62 | |
| 63 | free(cpy); |
| 64 | if (rc == 0) |
| 65 | return rc; |
| 66 | |
| 67 | return (1); /* Fatal error */ |
| 68 | } |
| 69 | |
| 70 | #define EXPECT AUTHCHANGEPWDIR "/authsystem.passwd" |
| 71 | |
| 72 | static int dochangepwd(struct passwd *pwd, |
| 73 | const char *oldpwd, const char *newpwd) |
| 74 | { |
| 75 | pid_t p, p2; |
| 76 | int pipefd[2]; |
| 77 | int waitstat; |
| 78 | FILE *fp; |
| 79 | |
| 80 | signal(SIGCHLD, SIG_DFL); |
| 81 | signal(SIGTERM, SIG_DFL); |
| 82 | |
| 83 | if (pipe(pipefd) < 0) |
| 84 | { |
| 85 | perror("CRIT: authsyschangepwd: pipe() failed"); |
| 86 | errno=EPERM; |
| 87 | return (-1); |
| 88 | } |
| 89 | |
| 90 | p=fork(); |
| 91 | |
| 92 | if (p < 0) |
| 93 | { |
| 94 | close(pipefd[0]); |
| 95 | close(pipefd[1]); |
| 96 | perror("CRIT: authsyschangepwd: fork() failed"); |
| 97 | errno=EPERM; |
| 98 | return (-1); |
| 99 | } |
| 100 | |
| 101 | if (p == 0) |
| 102 | { |
| 103 | char *argv[2]; |
| 104 | |
| 105 | dup2(pipefd[0], 0); |
| 106 | close(pipefd[0]); |
| 107 | close(pipefd[1]); |
| 108 | |
| 109 | close(1); |
| 110 | open("/dev/null", O_WRONLY); |
| 111 | dup2(1, 2); |
| 112 | |
| 113 | if (pwd->pw_uid != getuid()) |
| 114 | { |
| 115 | #if HAVE_SETLOGIN |
| 116 | #if HAVE_SETSID |
| 117 | if (setsid() < 0) |
| 118 | { |
| 119 | perror("setsid"); |
| 120 | exit(1); |
| 121 | } |
| 122 | #endif |
| 123 | |
| 124 | setlogin(pwd->pw_name); |
| 125 | #endif |
| 126 | libmail_changeuidgid(pwd->pw_uid, pwd->pw_gid); |
| 127 | } |
| 128 | |
| 129 | argv[0]=EXPECT; |
| 130 | argv[1]=0; |
| 131 | |
| 132 | execv(argv[0], argv); |
| 133 | perror("exec"); |
| 134 | exit(1); |
| 135 | } |
| 136 | |
| 137 | close(pipefd[0]); |
| 138 | signal(SIGPIPE, SIG_IGN); |
| 139 | |
| 140 | if ((fp=fdopen(pipefd[1], "w")) == NULL) |
| 141 | { |
| 142 | perror("CRIT: authsyschangepwd: fdopen() failed"); |
| 143 | kill(p, SIGTERM); |
| 144 | } |
| 145 | else |
| 146 | { |
| 147 | fprintf(fp, "%s\n%s\n", oldpwd, newpwd); |
| 148 | fclose(fp); |
| 149 | } |
| 150 | close(pipefd[1]); |
| 151 | |
| 152 | while ((p2=wait(&waitstat)) != p) |
| 153 | { |
| 154 | if (p2 < 0 && errno == ECHILD) |
| 155 | { |
| 156 | perror("CRIT: authsyschangepwd: wait() failed"); |
| 157 | errno=EPERM; |
| 158 | return (-1); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | if (WIFEXITED(waitstat) && WEXITSTATUS(waitstat) == 0) |
| 163 | return (0); |
| 164 | errno=EPERM; |
| 165 | return (-1); |
| 166 | } |