From: Bill Joy <wnj@ucbvax.Berkeley.EDU>
Date: Sun, 30 Dec 1979 08:17:07 +0000 (-0800)
Subject: BSD 3 development
X-Git-Tag: BSD-3~242
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/c2b52c9dd1c6d3f0e4c34a4c6898cb6619c7ac88?hp=7ed4d9e45ae4dd525b23d8e0211dc1ef0aa5da09

BSD 3 development
Work on file usr/src/cmd/passwd.c

Synthesized-from: 3bsd
---

diff --git a/usr/src/cmd/passwd.c b/usr/src/cmd/passwd.c
new file mode 100644
index 0000000000..a19a09f014
--- /dev/null
+++ b/usr/src/cmd/passwd.c
@@ -0,0 +1,172 @@
+/*
+ * enter a password in the password file
+ * this program should be suid with owner
+ * with an owner with write permission on /etc/passwd
+ */
+#include <stdio.h>
+#include <signal.h>
+#include <pwd.h>
+
+char	passwd[] = "/etc/passwd";
+char	temp[]	 = "/etc/ptmp";
+struct	passwd *pwd;
+struct	passwd *getpwent();
+int	endpwent();
+char	*strcpy();
+char	*crypt();
+char	*getpass();
+char	*getlogin();
+char	*pw;
+char	pwbuf[10];
+char	buf[BUFSIZ];
+
+main(argc, argv)
+char *argv[];
+{
+	char *p;
+	int i;
+	char saltc[2];
+	long salt;
+	int u,fi,fo;
+	int insist;
+	int ok, flags;
+	int c;
+	int pwlen;
+	FILE *tf;
+	char *uname;
+
+	insist = 0;
+	if(argc < 2) {
+		if ((uname = getlogin()) == NULL) {
+			printf ("Usage: passwd user\n");
+			goto bex;
+		} else {
+			printf("Changing password for %s\n", uname);
+		}
+	} else {
+		uname = argv[1];
+	}
+	while(((pwd=getpwent()) != NULL)&&(strcmp(pwd->pw_name,uname)!=0));
+	u = getuid();
+	if((pwd==NULL) || (u!=0 && u != pwd->pw_uid))
+		{
+		printf("Permission denied.\n");
+		goto bex;
+		}
+	endpwent();
+	if (pwd->pw_passwd[0] && u != 0) {
+		strcpy(pwbuf, getpass("Old password:"));
+		pw = crypt(pwbuf, pwd->pw_passwd);
+		if(strcmp(pw, pwd->pw_passwd) != 0) {
+			printf("Sorry.\n");
+			goto bex;
+		}
+	}
+tryagn:
+	strcpy(pwbuf, getpass("New password:"));
+	pwlen = strlen(pwbuf);
+	if (pwlen == 0) {
+		printf("Password unchanged.\n");
+		goto bex;
+	}
+	ok = 0;
+	flags = 0;
+	p = pwbuf;
+	while(c = *p++){
+		if(c>='a' && c<='z') flags |= 2;
+		else if(c>='A' && c<='Z') flags |= 4;
+		else if(c>='0' && c<='9') flags |= 1;
+		else flags |= 8;
+	}
+	if(flags >=7 && pwlen>= 4) ok = 1;
+	if(((flags==2)||(flags==4)) && pwlen>=6) ok = 1;
+	if(((flags==3)||(flags==5)||(flags==6))&&pwlen>=5) ok = 1;
+
+	if((ok==0) && (insist<2)){
+		if(flags==1)
+		printf("Please use at least one non-numeric character.\n");
+		else
+		printf("Please use a longer password.\n");
+		insist++;
+		goto tryagn;
+		}
+
+	if (strcmp(pwbuf,getpass("Retype new password:")) != 0) {
+		printf ("Mismatch - password unchanged.\n");
+		goto bex;
+	}
+
+	time(&salt);
+	salt += getpid();
+
+	saltc[0] = salt & 077;
+	saltc[1] = (salt>>6) & 077;
+	for(i=0;i<2;i++){
+		c = saltc[i] + '.';
+		if(c>'9') c += 7;
+		if(c>'Z') c += 6;
+		saltc[i] = c;
+	}
+	pw = crypt(pwbuf, saltc);
+	signal(SIGHUP, SIG_IGN);
+	signal(SIGINT, SIG_IGN);
+	signal(SIGQUIT, SIG_IGN);
+
+	if(access(temp, 0) >= 0) {
+		printf("Temporary file busy -- try again\n");
+		goto bex;
+	}
+	close(creat(temp,0600));
+	if((tf=fopen(temp,"w")) == NULL) {
+		printf("Cannot create temporary file\n");
+		goto bex;
+	}
+
+/*
+ *	copy passwd to temp, replacing matching lines
+ *	with new password.
+ */
+
+	while((pwd=getpwent()) != NULL) {
+		if(strcmp(pwd->pw_name,uname) == 0) {
+			u = getuid();
+			if(u != 0 && u != pwd->pw_uid) {
+				printf("Permission denied.\n");
+				goto out;
+			}
+			pwd->pw_passwd = pw;
+			if (pwd->pw_gecos[0] == '*')
+				pwd->pw_gecos++;
+		}
+		fprintf(tf,"%s:%s:%d:%d:%s:%s:%s\n",
+			pwd->pw_name,
+			pwd->pw_passwd,
+			pwd->pw_uid,
+			pwd->pw_gid,
+			pwd->pw_gecos,
+			pwd->pw_dir,
+			pwd->pw_shell);
+	}
+	endpwent();
+	fclose(tf);
+
+/*
+ *	copy temp back to passwd file
+ */
+
+	if((fi=open(temp,0)) < 0) {
+		printf("Temp file disappeared!\n");
+		goto out;
+	}
+	if((fo=creat(passwd, 0644)) < 0) {
+		printf("Cannot recreat passwd file.\n");
+		goto out;
+	}
+	while((u=read(fi,buf,sizeof(buf))) > 0) write(fo,buf,u);
+
+out:
+	unlink(temp);
+
+bex:
+	exit(1);
+}