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authorJohn Denker <jsd@av8n.com>2012-06-03 01:38:28 (GMT)
committerJohn Denker <jsd@av8n.com>2012-06-03 01:38:28 (GMT)
commit78488dc84afac1398e582ae6bbaf9606d07afa1e (patch)
tree71723e916f23a6a07422587de275dece3ea60252 /checkpasswd/checkpassword.c
parent81b5f8f3ab26a7969956faef29a90499ece40ff5 (diff)
checkpassword ... as downloaded
Diffstat (limited to 'checkpasswd/checkpassword.c')
-rw-r--r--checkpasswd/checkpassword.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/checkpasswd/checkpassword.c b/checkpasswd/checkpassword.c
new file mode 100644
index 0000000..afca798
--- /dev/null
+++ b/checkpasswd/checkpassword.c
@@ -0,0 +1,92 @@
+#include "error.h"
+#include "pathexec.h"
+#include "prot.h"
+
+extern char *crypt();
+#include <pwd.h>
+static struct passwd *pw;
+
+#include "hasspnam.h"
+#ifdef HASGETSPNAM
+#include <shadow.h>
+static struct spwd *spw;
+#endif
+
+#include "hasuserpw.h"
+#ifdef HASUSERPW
+#include <userpw.h>
+static struct userpw *upw;
+#endif
+
+static char up[513];
+static int uplen;
+
+main(int argc,char **argv)
+{
+ char *login;
+ char *password;
+ char *encrypted;
+ char *stored;
+ int r;
+ int i;
+
+ if (!argv[1]) _exit(2);
+
+ uplen = 0;
+ for (;;) {
+ do
+ r = read(3,up + uplen,sizeof(up) - uplen);
+ while ((r == -1) && (errno == error_intr));
+ if (r == -1) _exit(111);
+ if (r == 0) break;
+ uplen += r;
+ if (uplen >= sizeof(up)) _exit(1);
+ }
+ close(3);
+
+ i = 0;
+ if (i >= uplen) _exit(2);
+ login = up + i;
+ while (up[i++]) if (i >= uplen) _exit(2);
+ password = up + i;
+ if (i >= uplen) _exit(2);
+ while (up[i++]) if (i >= uplen) _exit(2);
+
+ pw = getpwnam(login);
+ if (pw)
+ stored = pw->pw_passwd;
+ else {
+ if (errno == error_txtbsy) _exit(111);
+ _exit(1);
+ }
+#ifdef HASUSERPW
+ upw = getuserpw(login);
+ if (upw)
+ stored = upw->upw_passwd;
+ else
+ if (errno == error_txtbsy) _exit(111);
+#endif
+#ifdef HASGETSPNAM
+ spw = getspnam(login);
+ if (spw)
+ stored = spw->sp_pwdp;
+ else
+ if (errno == error_txtbsy) _exit(111);
+#endif
+ if (!stored) _exit(1);
+
+ encrypted = crypt(password,stored);
+ for (i = 0;i < sizeof(up);++i) up[i] = 0;
+
+ if (!*stored || strcmp(encrypted,stored)) _exit(1);
+
+ if (prot_gid((int) pw->pw_gid) == -1) _exit(1);
+ if (prot_uid((int) pw->pw_uid) == -1) _exit(1);
+ if (chdir(pw->pw_dir) == -1) _exit(111);
+
+ if (!pathexec_env("USER",pw->pw_name)) _exit(111);
+ if (!pathexec_env("HOME",pw->pw_dir)) _exit(111);
+ if (!pathexec_env("SHELL",pw->pw_shell)) _exit(111);
+ pathexec(argv + 1);
+ _exit(111);
+}